transition zone in concrete is * 1 point time where concrete gets converted from the wet form to the dry form cement particles taking part in hydration process the process in which concrete shrinks when allowed to dry in air at low relative humidity zone between aggregate and hydrated cement paste
Answers
A larger porosity and lower cement content than other areas, the area known as the "interfacial-transition zone" (ITZ) where aggregates and cement paste meet is crucial
By "transition zone in concrete," what do you mean?Because it has a larger porosity and lower cement content than other areas, the area known as the "interfacial-transition zone" (ITZ) where aggregates and cement paste meet is crucial (Figure 1). The ITZ is where microcracks frequently start and spread most quickly.ITZ is the "weak-link" of concrete, as indicated in section 3.1, because of its high porosity. Damages done to concrete therefore have a major impact on the ITZ (either chemically, mechanically, or thermally). A higher level of damage consequently results in less contact between the aggregate and the mortar.To learn more about Weak-link" of concrete refer to:
https://brainly.com/question/17882165
#SPJ4
Related Questions
need urgent help!!
Determine the point(s) P on the line e with equation x−6 = ( y−3)/4 = ( 1−z)/3
for which the line connecting P with Q(2, −6, 5) is perpendicular to e.
Answers
The quartiles divide a set of observations into four portions, each representing 25% of the observations, together with the minimum and maximum values of the data set. The interquartile range, a measurement of variation around the median, is calculated using quartiles.
How are quartiles determined?In order to quartile a set of data with n items (numbers), we choose the n/4th, n/2nd, and n/4th items. Interpolation between the adjacent items is used if indexes n/4, n/2, or 3n/4 are not integers.For instance, the first quartile Q1 of ordered data is the 25th item, the second quartile Q2 is the 50th item, and the third quartile Q3 is the 75th item. The fourth quartile Q4 would be the highest item of data, and the zeroth quartile Q0 would be the minimum item; however, these extreme quartiles are referred to as the minimum and maximum of a set, respectively.Calculation:Statistical file: {2, -6, 5}
Quartile Q1: -6
Quartile Q2: 2
Quartile Q3: 5.
To Learn more about quartiles refer to:
https://brainly.com/question/28168026
#SPJ1
A 150-lbm astronaut took his bathroom scale (a
spring scale) and a beam scale (compares masses) to the
moon where the local gravity is g ! 5.48 ft/s2
. Determine
how much he will weigh (a) on the spring scale and (b) on
the beam scale.
Answers
Given the following data:
Mass of astronaut = 150-lbm.
Acceleration due to gravity on Moon = 5.48 ft/s².
What is weight?Weight can be defined as the force acting on an object or a physical body due to the effect of gravity. Also, the weight of a physical object (body) is typically measured in Newton or ounces.
How to calculate the weight of this astronaut?Mathematically, the weight force on a physical body can be calculated by using this formula:
W = mg
Where:
W represents the weight.m represents the mass.g represents the acceleration due to gravity.Substituting the given parameters into the formula, we have;
Weight = 150 × 1/32.2 × 5.48
Weight = 25.5 lbf.
For the weight on beam scale.A beam scale is a measuring instrument that is designed and developed to compare the masses of a physical body and as such, it's not affected by the variations in acceleration due to gravity. Therefore, the beam scale would read 150-lbf as it read on earth.
Read more on weight here: brainly.com/question/13833323
#SPJ1
then, in the final column, indicate the resulting change in the equilibrium price and quantity when supply and demand shift in the direction you previously indicated on both graphs. if you cannot determine the answer without knowing the magnitude of the shifts, choose cannot determine.
Answers
The direction of a price or quantity change when demand and supply are both changing depends on how much each is changing compared to the other.
Demand in economics refers to the quantity of a good that consumers are willing and able to buy at various prices at any particular time. The demand curve is another name for the relationship between fee and amount requested. Demand unquestionably influences a customer's decision to purchase goods and services without hesitation and to pay the price charged. Simply put, the demand is the vast range of goods that consumers are prepared and eager to purchase at various prices during the course of a specific period of time. For instance, the first slice of pizza that a customer purchases when they're hungry will be the one with the biggest benefit or use.
Learn more about Demand here:
https://brainly.com/question/28260303
#SPJ4
When trying to prevent a rollover, it is important that the driver does not
A. overcorrect
B. grab the steering wheel
C. slam the brakes
D. undercorrect
Answers
we wish to design a closed circuit supersonic wind tunnel that produces a mach 2.8 flow at standard sea level conditions in the test section and has a mass flow rate of air of 15 kg/s. calculate the necessary reservoir pressure and temperature, the nozzle throat area, the test section area, and the diffuser throat area. assume a worst case stagnation pressure loss in the test section based on a normal shock.
Answers
How fast is the fastest wind tunnel?
The JF-22 wind tunnel, which would be the fastest in the world, would be situated in the Huairou District of northern Beijing and be capable of simulating flights at speeds of up to 10 km/s, or 30 times the speed of sound.
What is wind tunnel?They measure conditions that affect aircraft and other equipment, such as elevation, drag, shockwaves, and others. that speed against the wind. Additionally, those tunnels can assist engineers in figuring out how wind interacts with stationary objects like buildings and bridges and finding ways to strengthen and make them safer.Learn more about wind tunnels here:
brainly.com/question/15561541
#SPJ4
if a computer beeps once during post, what does this commonly mean to a technician
Answers
If a computer beeps once during POST, this computer means to a technician that the computer hardware is working correctly. POST stands for "Power-On Test.
which is the first test run by the BIOS when a computer is turned on. During this test, the BIOS checks various components of the computer hardware to make sure they are functioning properly.
If a computer beeps once during POST, this means that the BIOS has completed the POST successfully and has found no errors with the hardware. A single beep is known as a "good beep," indicating that the system is functioning properly. The single beep is used to indicate that the computer has passed its self-test and is ready to boot into the operating system.
To know more about hardware visit:
https://brainly.com/question/32810334
#SPJ11
An electric double oven can draw up to 34 amps at 240 volts when heating both ovens. What is the power demand, and how much energy is used if the oven operates at that level for 2 hours?
Answers
Answer:
8.16 kW16.32 kWhExplanation:
Power is the product of volts and amps:
P = VI = (240 V)(34 A) = 8160 W = 8.16 kW
Energy is the product of power and time:
(8.16 kW)(2 h) = 16.32 kWh
which of the following is not one of the four types of information found on networks?
Answers
There are four types of information found on networks: data, voice, video, and images.
Each of these types of information can be transmitted across a network in different ways depending on the network's infrastructure and the type of data being transmitted. Data refers to any digital information that can be stored or transferred across a network, such as text files, spreadsheets, or databases. Voice refers to audio data, such as telephone conversations or audio conferences. Video refers to moving images, such as video conferencing or streaming video content. Images refer to static images, such as photographs or graphics. Therefore, none of these types of information is not one of the four types of information found on networks.
To know more about network visit:
https://brainly.com/question/15002514
#SPJ11
1. Name three current problems in your life that could be solved through an algorithmic process. Explain why each of these problems is algorithmic in nature.
Answers
As a supervised learning algorithm for problem classification, the Decision Tree algorithm is one of the most widely utilized in machine learning today.
Which problems can be solved by algorithmic processes?Whether a problem is logical, mathematical, or complex in nature, algorithms can be created to solve it. As an illustration, consider sorting algorithms, depth-first search, and traveling salespeople. The algorithm, however, would arrive at a finite solution after a certain number of steps before coming to an end. Algorithms can be used to describe typical daily tasks. An algorithm for preparing a specific cuisine, for instance, might be thought of as a recipe.
Steps 1-3 outline the algorithm. The amounts of each component that are mentioned, together with the type of pan and desired topping, are our inputs. A series of procedures known as an algorithm are used to solve issues or carry out tasks. A typical illustration of an algorithm is a recipe, which is a set of detailed directions for making a dish or meal.
To learn more about algorithm refer to :
https://brainly.com/question/15217393
#SPJ1
Obtain both analytically and computationally the rise time, peak time, maximum overshoot, and settling time in the unit-step response of a closed-loop system given by C(s) 36 R(S) 52 + 2s + 36 R(s) C(s) K S +2 k Figure 5–84 Closed-loop system. R(s) C(s) 16 $ + 0.8 S k Figure 5-85 Block diagram of a system.
Answers
To obtain the rise time, peak time, maximum overshoot, and settling time analytically, one must determine the transfer function of the closed-loop system and analyze its characteristics.
Here, the information provided is incomplete, and as the transfer function of the system is not fully specified. The given equations represent the transfer functions of the individual blocks in the system, but the interconnections and feedback are not clear. So, to obtain accurate results, the complete transfer function of the closed-loop system is needed. Once the transfer function is known, we can perform stability and transient analysis to determine the rise time, peak time, maximum overshoot, and settling time.
Learn more about the transfer function here.
https://brainly.com/question/32811719
#SPJ4
a risk that happens when populations severely overextend the carrying capacity of their environment.
A) RESOURCE GROWTH
B) CATASTROPHIC COLLAPSE
C)DEMOGRAPHIC TRANSITION
D)INCREASED POPULATION GROWTH
Answers
**Can someone please help me solve these problems step by step, thank you!
1. If a 12-inch diameter driving Gear A has 100 tooth which turns CCW with a torque of 200 ft-lb and 100 rpm is meshed with Gear B, 25 tooth, turn along with Gear C, 50 tooth as they are a compound gear and Gear D, 150 tooth meshed with C.
-->sketch and annotate the gear train.
-->what direction does gear ratio B, C, and D turn?
-->what is the gear ratio for B, C, and D?
-->what is the angular velocity for gears B, C, and D?
-->what is the torque for gears B, C, and D?
-->what is the diameter of gears B, C, and D?
2. In a pulley system, pulley A is moving 1000 rpm and has a diameter of 18inches. There are two pulleys with different sizes, B moving ot 1575 rpm and C moving at 1850 rpm attached on a single axle.
-->sketch and annote the pulley system.
-->what is the diameter of pulley B and pulley C?
Answers
Answer:
The answer is "\(\bold{11.428 \ in \ \ and \ \ 9.729 \ in}\)".
Explanation:
The second question solution can be defined as follows:
\(N_A= 1000 \ rpm\\\\N_B=1575 \ rpm\\\\N_C=1850 \ rpm\\\\D_A= 18 \ in \\\\\)
In point 1:
Calculating the value of the linear velocity is the same:
\(\to V_A=V_B\\\\\to \pi D_A N_A=\pi D_BN_B\\\\\to D_B= \frac{D_A \times N_A}{N_B}\)
\(=\frac{18 \times 1000}{1575}\\\\=11.428 \ in \ \ \text{Diameter of pulley B}\)
In point 2:
\(\to V_A=V_C\\\\\to \pi D_A N_A=\pi D_C N_C\\\\\to D_C=\frac{D_A \times N_A}{N_C}\\\\\)
\(=\frac{1000 \times 18}{1850}\\\\=9.729 \ in \ \ \text{Diameter of pulley B}\)
The UHRS platform is optimized for Edge/Internet Explorer only. You can still use your favorite browser, but keep in mind that you may experience technical issues when working on UHRS with a different browser than Edge or Internet Explorer.
UHRS is optimized for...
Answers
It is to be noted that all UHRS platforms are optimized for the popular kinds of internet browser applications.
What is a UHRS?The Universal Human Relevance System (UHRS) is a crowdsourcing platform that allows for data labeling for a variety of AI application situations.
Vendor partners link people referred to as "judges" to offer data labeling at scale for us. All UHRS judges are bound by an NDA, ensuring that data is kept protected.
A browser is a software tool that allows you to see and interact with all of the knowledgeon the World Wide Web. Web sites, movies, and photos are all examples of this.
Learn more about internet browser applications.:
https://brainly.com/question/16829947
#SPJ1
if you want to withdraw $10000 at the end of two years and $35000 at the end of four years, how much should you deposit now into an account that pays 9% interest compounded annually?
Answers
Answer:
490000 dollars
Explanation:
Steam expands in a turbine from 4 MPa and 500 C and 0.5 MPa and 250C at a rate of 1350 kg/h. Heat is lost from the turbine at a rate of 25 kJ/s during the process. The power output of the turbine is
Answers
The power output of the turbine during the steam expansion process is determined as 157 kW.
Power output of the turbineThe power output of the turbine is calculated as follows;
P(out) = m'(h₁ - h₂) - Q(loss)
where;
m' is the mass flow rate (kg/s)m' = (1350 kg)/(3600 s)
m' = 0.375 kg/s
From steam table for superheated water,
h₁ at 500 ⁰C and 4 MPa = 3446 kJ/kgh₂ at 250 ⁰C and 0.5 MPa = 2961 kJ/kgP(out) = m'(h₁ - h₂) - Q(loss)
P(out) = 0.375(3446 - 2961) - 25 kJ/s
P(out) = 156.88 kJ/s = 156.88 kW ≈ 157 kW
Learn more about power output here: https://brainly.com/question/20038729
#SPJ4
in order to get the high sensitive readings, should a strain gauge have a high stiffness or a low stiffness? explain
Answers
A strain gauge should have a low stiffness in order to get high sensitive readings. This is because a strain gauge is designed to measure small changes in length or deformation in a material due to external forces, and a low stiffness allows for greater flexibility and sensitivity to these changes.
A strain gauge is a type of sensor that is used to measure the deformation or strain of a material. It consists of a thin wire or foil that is bonded to the surface of the material being measured. When the material is deformed due to an external force, the wire or foil also stretches or compresses, causing a change in resistance. This change in resistance can be measured and used to calculate the strain or deformation of the material. The sensitivity of a strain gauge is determined by its stiffness, which is the resistance of the wire or foil to deformation. A strain gauge with a high stiffness will be less sensitive to small changes in deformation, while a strain gauge with a low stiffness will be more sensitive to these changes. Therefore, in order to get high sensitive readings from a strain gauge, it should have a low stiffness. This will allow it to detect even small changes in deformation, which can be useful in applications such as structural monitoring or strain testing.
Learn more about strain gauge here https://brainly.com/question/23885278
#SPJ11
A ________ defines the boundaries of a system in a work breakdown structure (WBS).
A) trade-off
B) code
C) scope
D) scale
Answers
scope. In project management, a work breakdown structure (WBS) is a hierarchical decomposition of a project into smaller and more manageable components. So correct answer is C
It helps to organize and structure the project's tasks and deliverables, and to define the project's scope. The scope of a project refers to the boundaries and limitations of the project, including the specific goals, objectives, requirements, and deliverables that are within the project's purview.In the context of a WBS, the scope defines the boundaries of the system that is being broken down into smaller components. It outlines the overall objectives and goals of the project and identifies the specific tasks and deliverables that are required to achieve those objectives. The scope helps to ensure that the project team is focused on the right tasks and that they understand the overall purpose and goals of the project.In addition to defining the boundaries of the system, the scope also helps to identify any constraints or limitations that may impact the project. This may include factors such as budget, schedule, resources, or external factors such as regulations or legal requirements. By clearly defining the scope of the project, the project team can better manage these constraints and ensure that the project stays on track.In summary, the scope is a critical component of a work breakdown structure (WBS) as it defines the boundaries of the system being broken down into smaller components. It outlines the objectives and goals of the project and identifies the specific tasks and deliverables required to achieve those objectives. By clearly defining the scope, the project team can better manage constraints and ensure the project stays on track.
To know more about decomposition visit:
brainly.com/question/28386212
#SPJ11
A steel column of a building is supported below ground by a steel pile foundation system. The piles are arranged in groups so that the total capacity of pile group (the capacity of all the piles working together) is greater than the load of the column. The piles groups are covered by a thick concrete pile cap which distributes the column load equally to each pile. The piles and driven (hammered) into the ground until the bottom reaches bedrock. The material and geometric properties of the piles are: o elastic modulus, E = 29,000 ksi o cross sectional area of one pile, A = 12.1 in- o allowable axial stress in the steel, Fall = 30.0 ksi o coefficient of thermal expansion, alpha = 6.5E-6 /F degree a. Determine the quantity of steel piles required in the pile group. b. What is the axial stress (ksi) in each pile? c. If 8 piles are used, and the length of the piles is 80 ft. How much does the pile cap move downward (in inches) under the full 2250 kip load (assuming no friction between the soil and the pile)? d. Due to global warming, the temperature of the piles increases by 10 degrees F. How much do the piles grow due to this temperature change?
Answers
We need 2 piles in the pile group, axial stress (ksi) in each pile is 93.39 ksi, the pile cap moves downward by 0.525 inches under the full load and the piles grow by 0.0624 inches due to the temperature increase.
How We Calculated?
a. To determine the quantity of steel piles required in the pile group, we need to know the load of the column.
Assuming the load of the column is 2250 kips, and the allowable axial stress in the steel is 30 ksi, the total area of the piles required is:
2250 kips / (30 ksi x 4) = 18.75 in\(^2\)
Since the cross-sectional area of one pile is 12.1 in\(^2\), we need:
18.75 in\(^2\) / 12.1 in\(^2\) = 1.55 piles
b. The axial stress in each pile is equal to the load of the column divided by the area of one pile:
2250 kips / (2 x 12.1 in\(^2\)) = 93.39 ksi
c. The downward movement of the pile cap under the full load of 2250 kips can be calculated using the formula:
delta = (P x L) / (AE)
where delta is the downward movement, P is the load on each pile (2250 kips / 2 = 1125 kips), L is the length of the pile (80 ft x 12 in/ft = 960 in), A is the cross-sectional area of one pile (12.1 in\(^2\)), and E is the elastic modulus (29,000 ksi).
Plugging in the values:
delta = (1125 kips x 960 in) / (2 x 12.1 in\(^2\) x 29,000 ksi) = 0.525 in
d. The growth of the piles due to a temperature increase of 10 degrees F can be calculated using the formula:
deltaL = alpha x L x deltaT
where deltaL is the change in length, alpha is the coefficient of thermal expansion (6.5E-6 /F degree), L is the original length of the pile (80 ft x 12 in/ft = 960 in), and deltaT is the change in temperature (10 degrees F).
Plugging in the values:
deltaL = 6.5E-6 /F degree x 960 in x 10 degrees F = 0.0624 in
Learn more about pile
brainly.com/question/13595713
#SPJ11
Can someone help me plz!!! It’s 23 points
Answers
Answer:
0.00695 A
Explanation:
µ represents \(10^{-6}\). Multiply this by 6,950.
A wing model is tested in a subsonic wind tunnel at standard sea-level conditions with a velocity of 100 m/s. The wing area and chord are 1.5 m2 and 0.45 m respectively. The moment about the c. g. when the lift is zero is found to be -12.4 N. m. When the model is pitched to another AOA, the lift and moment about the c. g. are measured to be 3675 N and 20.67 N. m., respectively. Calculate the value of the moment coefficient about the aerodynamic center (acmC) and the location of the aerodynamic center with respect to c. g..
Answers
In aerodynamics, the pitching moment on an airfoil is the moment (or torque) produced by the aerodynamic force on the airfoil if that aerodynamic force is applied at the aerodynamic center of the airfoil rather than the pressure center.
The pitching moment on an airplane's wing is part of the overall moment that must be balanced using the lift on the horizontal stabilizer. Section 5.3 A pitching moment, in general, is any moment operating on the pitch axis of a moving body.
The lift on an airfoil is a dispersed force that acts at a location known as the center of pressure. On a cambered airfoil, however, there is movement when the angle of attack varies.
Learn more about pitching moment here:
https://brainly.com/question/31666201
#SPJ4
Ethics is an important factor in the life of an engineer. What do you understand by the term’s personal ethics and professional ethics?
Ethical problems can be complex, and engineers may struggle finding solutions when problems arise. What resources can engineers use to help them?
Answers
When engineers face ethical problems or dilemmas, there are several resources they can use to help them navigate these situations: Codes of Ethics, Ethical Training and Education, Ethical Committees, etc.
Personal ethics refers to an individual's own moral principles and values that guide their behavior and decision-making in their personal life. It involves considering what is right or wrong based on one's own beliefs, values, and experiences. Personal ethics are subjective and can vary from person to person.
Professional ethics, on the other hand, refers to the ethical standards and principles that govern the behavior of professionals within their specific field or industry. For engineers, professional ethics encompass the moral obligations and responsibilities they have towards their clients, employers, colleagues, society, and the environment. Professional ethics provide a framework for engineers to ensure that their actions and decisions align with the values and expectations of their profession.
When engineers face ethical problems or dilemmas, there are several resources they can use to help them navigate these situations:
1. Codes of Ethics: Many professional engineering organizations have established codes of ethics that provide guidelines and standards for ethical conduct in the engineering profession. These codes outline the responsibilities and ethical principles that engineers should uphold.
2. Ethical Guidelines and Policies: Companies and organizations often have their own ethical guidelines and policies in place. These documents help engineers understand the ethical expectations within their specific workplace or industry.
3. Ethical Training and Education: Continuous education and training in ethics can equip engineers with the knowledge and skills to identify and address ethical issues. Professional development programs and workshops may focus on ethical decision-making and provide case studies or scenarios to enhance ethical reasoning.
4. Professional Networks and Support: Engaging with professional networks, such as engineering associations and societies, can provide engineers with opportunities to discuss ethical challenges with peers and seek advice or guidance from experienced professionals.
5. Ethical Committees and Advisors: Some organizations have dedicated ethics committees or advisors who can provide guidance and assistance when engineers encounter ethical problems. These committees may offer confidential consultations and help engineers navigate complex ethical issues.
6. Legal and Regulatory Resources: Laws and regulations play a crucial role in defining ethical boundaries and providing legal frameworks. Engineers can consult legal resources, regulations, and guidelines to ensure compliance with legal and ethical requirements.
7. Ethical Decision-Making Frameworks: Engineers can utilize ethical decision-making frameworks, such as the Ethical Decision-Making Model or the SAD Formula (Scrutinize, Analyze, and Decide), to systematically evaluate ethical dilemmas and arrive at well-considered decisions.
By utilizing these resources, engineers can enhance their understanding of ethics, address ethical challenges effectively, and uphold the highest standards of professional conduct.
To know more about Professional ethics, click here:
https://brainly.com/question/29699359
#SPJ11
Scheduling can best be defined as the process used to determine:
Answers
Answer:
Overall project duration
Explanation:
Scheduling can best be defined as the process used to determine a overall project duration.
A cold store is designed with walls built from brick walls 102. 5mm thick. The interior is insulated with 60mm of mineral wool and 90 mm of foam insulation which is then faced with 20mm of plywood. Finally the plywood is covered with a 1mm thick stainless steel cladding. The effective surface area of the exterior is 320m2 and 70% of the total heat loss is calculated to be lost through this exterior surface. The exterior wall has a surface heat transfer coefficient of 22 W/m2K and the inner wall surface heat transfer coefficient is 14 W/m2K For brick λ = 0. 12 W/mk For mineral wool insulation λ = 0. 03 W/mK
For foam insulation λ = 0. 042 W/mK
For plywood λ = 0. 2 W/mk For stainless Steel λ = 25 W/mK The cold store is to be maintained at -25°C when the outside ambient temperature can reach 38°C. A) Derive and explain the Fourier equation for heat transfer through a flat surface. B) i) modify the Fourier equation to meet the requirements of the multi-layer surface, ii) hence determine the required cooling load of the refrigeration unit
Answers
The Fourier equation for heat transfer through a flat surface is given by:Q = (k * A * ΔT) / d.Using the given values and calculations for the different layers,
you can substitute the appropriate values into the equations to find the required cooling load of the refrigeration unit. where:Q is the rate of heat transfer,k is the thermal conductivity of the material,A is the surface area, ΔT is the temperature difference across the surface, and d is the thickness of the material. To modify the Fourier equation for the multi-layer surface of the cold store, we need to consider the heat transfer through each layer. We can calculate the overall heat transfer coefficient (U) for the multi-layer wall using the following formula:1/U = (1/h1) + (Δx1/k1) + (Δx2/k2) + ... + (1/hn)
where: h1, h2, ... hn are the surface heat transfer coefficients of each layer,Δx1, Δx2, ... are the thicknesses of each layer, and k1, k2, ... are the thermal conductivities of each layer. To determine the required cooling load of the refrigeration unit, we can use the formula:Q = U * A * ΔT where: Q is the rate of heat transfer,U is the overall heat transfer coefficient of the wall, A is the surface area, and ΔT is the temperature difference between the inside and outside of the cold store.Using the given values and calculations for the different layers, you can substitute the appropriate values into the equations to find the required cooling load of the refrigeration unit.
To know more about different layers visit:
https://brainly.com/question/29448369
#SPJ11
A horizontal force P is applied to a 130 kN box resting on a 33 incline. The line of action of P passes through the center of gravity of the box. The box is 5m wide x 5m tall, and the coefficient of static friction between the box and the surface is u=0.15. Determine the smallest magnitude of the force P that will cause the box to slip or tip first. Specify what will happen first, slipping or tipping.
Answers
Answer:
SECTION LEARNING OBJECTIVES
By the end of this section, you will be able to do the following:
Distinguish between static friction and kinetic friction
Solve problems involving inclined planes
Section Key Terms
kinetic friction static friction
Static Friction and Kinetic Friction
Recall from the previous chapter that friction is a force that opposes motion, and is around us all the time. Friction allows us to move, which you have discovered if you have ever tried to walk on ice.
There are different types of friction—kinetic and static. Kinetic friction acts on an object in motion, while static friction acts on an object or system at rest. The maximum static friction is usually greater than the kinetic friction between the objects.
Imagine, for example, trying to slide a heavy crate across a concrete floor. You may push harder and harder on the crate and not move it at all. This means that the static friction responds to what you do—it increases to be equal to and in the opposite direction of your push. But if you finally push hard enough, the crate seems to slip suddenly and starts to move. Once in motion, it is easier to keep it in motion than it was to get it started because the kinetic friction force is less than the static friction force. If you were to add mass to the crate, (for example, by placing a box on top of it) you would need to push even harder to get it started and also to keep it moving. If, on the other hand, you oiled the concrete you would find it easier to get the crate started and keep it going.
Figure 5.33 shows how friction occurs at the interface between two objects. Magnifying these surfaces shows that they are rough on the microscopic level. So when you push to get an object moving (in this case, a crate), you must raise the object until it can skip along with just the tips of the surface hitting, break off the points, or do both. The harder the surfaces are pushed together (such as if another box is placed on the crate), the more force is needed to move them.
Which of the following is a true statement concerning electrical systems?
a) the master switch creates a current that is supplied to the electrical system
b) the airspeed indicator is driven by the electrical system
c) lights and radios use the electrical system for power
Answers
The true statement concerning electrical systems is that lights and radios use the electrical system for power. Among the given options, option c) "lights and radios use the electrical system for power" is the true statement concerning electrical systems.
In modern electrical systems, lights and radios (among other components) rely on the electrical system for power. Electrical systems in various domains, such as aviation or general household applications, provide the necessary electrical energy to operate these devices. Lights, whether they are interior lights or external lights on vehicles, are powered by the electrical system. Similarly, radios and other electronic devices require electrical power to function, and they draw power from the electrical system.
On the other hand, option a) "the master switch creates a current that is supplied to the electrical system" is not a true statement. The master switch does not create the current; rather, it controls the flow of electrical power within the system. It acts as a control mechanism to enable or disable the power supply to various components within the electrical system.
Option b) "the airspeed indicator is driven by the electrical system" is also not a true statement. The airspeed indicator in aviation is typically driven by other mechanisms, such as pitot tubes or air pressure sensors, which measure the airspeed independently of the electrical system.
Learn more about sensors here: https://brainly.com/question/32314947
#SPJ11
The base of an aluminum block, which is fixed in place, measures 90 cm by 90 cm, and the height of the block is 60 cm. A force, applied to the upper face and parallel to it, produces a shear strain of 0.0060. The shear modulus of aluminum is . What is the displacement of the upper face in the direction of the applied force
Answers
The question is incomplete. The complete question is :
The base of an aluminum block, which is fixed in place, measures 90 cm by 90 cm, and the height of the block is 60 cm. A force, applied to the upper face and parallel to it, produces a shear strain of 0.0060. The shear modulus of aluminum is \(3.0 \times 10^{10} \ Pa\) . What is the displacement of the upper face in the direction of the applied force?
Solution :
The relation between shear modulus, shear stress and strain,
\($\text{Shear modulus, S =} \frac{\text{Shear stress}}{\text{shear strain}}$\)
Shear stress = shear modulus (S) x shear strain
\($=3 \times 10^{10} \times 0.0060$\)
\($=1.80 \times 10^8$\) Pa
\($=180 \times 10^6$\) Pa
\($=180 \ MPa$\)
The length represents the distance between the fixed in place portion and where the force is being applied.
Therefore,
\($\text{Displacement} = \text{shear strain} \times \text{length}$\)
= 0.006 x 60 cm
= 0.360 cm
= 3.6 mm
Thus, the displacement of the upper face is 3.6 mm in the direction of the applied force.
Advantage of reconnaissance survay
Answers
Answer:
fgfr
cg
Explanation:
xhrrhfdfghtrfgg
PLEASE HELP: Describe how systems engineering is applied to space
systems. Identify what aspects of systems engineering are
emphasized differently for this domain.
Answers
Systems engineering plays a vital role in the design and operation of space systems, addressing the complex challenges of the space environment, mission requirements, reliability, and safety.
Systems engineering plays a crucial role in the design, development, and operation of space systems.
There are several aspects that are emphasized differently in the domain of space systems.
System Complexity: Space systems are highly complex due to the challenging environment they operate in and the intricate interdependencies among their components.
Mission Requirements: Space systems are designed to achieve specific mission objectives, such as Earth observation, communication, navigation, or exploration.
Reliability and Safety: Space systems operate in harsh and unforgiving environments, where repair or maintenance is often impossible. As a result, reliability and safety are critical considerations.
Launch and Operations: Launching a space system into orbit and managing its operations in space present unique challenges.
Spacecraft Subsystems: Space systems comprise numerous subsystems, such as propulsion, power, thermal control, communication, attitude determination and control, and payload.
Environmental Considerations: The space environment imposes unique challenges on systems engineering. Extreme temperatures, vacuum, radiation, micrometeoroids, and orbital debris pose risks to space systems.
Integration and Testing: Given the complexity and criticality of space systems, thorough integration and testing are essential.
To learn more on System engineering click:
https://brainly.com/question/11221934
#SPJ4
What type of DTCs are set by non-emission related diagnostic tests?
Answers
Answer:
Type C and D DTCS.
Quốc gia được cấu thành từ mấy yếu tố