A roller coaster, traveling with an initial speed of 23 m/s, decelerates
uniformly at -4 m/s2 to a full stop. How far does the roller coaster travel
during its deceleration?
I NEED STEP BY STEP EXPLANATION
Answers
Answer:
5 and 3/4 meters
Explanation:
This is because if it is slowing down by 4 meters and it was moving at 23, then you would figure out how many times 4 can go into 23 and you'd get 5 and 3/4 meters.
Related Questions
1. (a) At what temperature do the Fahrenheit and Celsius scales have the same numerical value? (b) At what temperature do the Fahrenheit and Kelvin scales have the same numerical value? 1. How large an expansion gap should be left between steel railroad rails if they may reach a maximum temperature 30 deg C greater than when they were laid? Their 1 original length is 12.5 m. Use a=1.2x10-5 O m
Answers
The point at which the Fahrenheit and Celsius scales have the same numerical value is -40°C. The point at which the Fahrenheit and Kelvin scales have the same numerical value is 459.67°F the expansion gap that should be left between the steel railroad rails is 0.0045 m or 4.5 mm.
(a) The point at which the Fahrenheit and Celsius scales have the same numerical value is -40°C. This is because this temperature is equivalent to -40°F. At this temperature, both scales intersect and meet the same numerical value.
(b) The point at which the Fahrenheit and Kelvin scales have the same numerical value is 459.67°F. At this temperature, both scales intersect and meet the same numerical value.
For the second part of the question:
Given that the original length of the steel railroad rails is 12.5m, the maximum temperature rise is 30℃, and the coefficient of linear expansion (a) is 1.2×10⁻⁵/℃.
Therefore, the expansion ΔL can be calculated as:
ΔL = L×a×ΔT
Where L is the original length of the steel railroad rails, a is the coefficient of linear expansion, and ΔT is the temperature rise.
Substituting the given values, we have:
ΔL = 12.5×1.2×10⁻⁵×30
ΔL = 0.0045 m
Therefore, the expansion gap that should be left between the steel railroad rails is 0.0045 m or 4.5 mm. This gap allows the rails to expand without buckling or bending.
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Importance of a cell
Answers
Explanation:
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
The different shapes of the moon seen from Earth are called
Answers
Answer:
they are called phases of the moon.
The different shapes of the moon seen from Earth are called phases of moon
What is phases of moon ?The portion of the moon that we can see from the earth on any given night is called phases of moon . There are four phases of moon 1) new moon 2) first quarter 3) full moon 4) third quarter
The earth rotates around the sun and the moon rotates around the earth . so , now we know that moon is in between sun and earth , due to this orbiting the sunlight falls on moon and we see moon in the light of sun as we know moon does not have its own light . Because of this rotation sunlight fall at different angles because position of moon with respect to earth is changing constantly due to which different shapes has been observed from the earth's surface ,after being reflected that light reaches the earth and being observed by the observer on earth as moon having different shapes called its phases of moon.
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Mercury’s natural state is where the atoms are close to each other but are still free to pass by each other. In which state(s) could mercury naturally exist?
Answers
Answer:
Mercury's natural state is where the atoms are close to each other but are still free to pass by each other. In which state(s) could mercury naturally exist?
Liquid is the answer
Explanation:
What is the direction of the electric field at location c due only to the dipole?
Answers
the direction of the electric field at location c due only to the dipole depends on the orientation of the dipole. If the dipole is horizontal, the electric field points from left to right. If the dipole is vertical, the electric field points from top to bottom
The direction of the electric field at location c due only to the dipole depends on the orientation of the dipole.
A dipole consists of two equal and opposite charges separated by a small distance. The electric field lines always point away from the positive charge and towards the negative charge.
If the dipole is aligned horizontally, with the positive charge on the left and the negative charge on the right, the electric field at location c would point from left to right.
Conversely, if the dipole is aligned vertically, with the positive charge on the top and the negative charge on the bottom, the electric field at location c would point from top to bottom.
In summary, the direction of the electric field at location c due only to the dipole depends on the orientation of the dipole.
If the dipole is horizontal, the electric field points from left to right. If the dipole is vertical, the electric field points from top to bottom.
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3. A museum curator moves artifacts into place on various different display
surfaces. Use the values in Table 2 to find Fs,max and Fx for the following
situations:
a. moving a 145 kg aluminum sculpture across a horizontal steel platform
b. pulling a 15 kg steel sword across a horizontal steel shield
c. pushing a 250 kg wood bed on a horizontal wood floor
d. sliding a 0.55 kg glass amulet on a horizontal glass display case
"
Answers
Answer: we are given the mass of an aluminum sculpture which is 145 kg and a horizontal force equal to 668 Newtons. The coefficient of friction can be determined by dividing the horizontal force by the weight of the object. In this case, 668 N / 145 * 9.8 equal to coeff of friction of 0.47
How is the strength of an electromagnetic affected by the number of turns of wire in coil
Answers
Answer:
The magnetic field strength of an electromagnet is therefore determined by the ampere-turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field
Explanation:
Two spherical objects have masses of 200 kg and 500 kg. Their centers are separated by a distance of 25 m. Find the gravitational attraction between them.
Answers
Answer:
1.07 x 10⁻⁸N
Explanation:
Given parameters:
Mass 1 = 200kg
Mass 2 = 500kg
Distance of separation = 25m
Unknown:
Gravitational attraction between the two bodies = ?
Solution:
To solve this problem, we use the equation of the universal gravitation;
F = \(\frac{G mass 1 x mass 2}{r^{2} }\)
G is the universal gravitation constant = 6.67 x 10⁻¹¹Nm²kg⁻²
r is the distance
Now insert the parameters and solve;
F = \(\frac{6.67 x 10^{-11} x 200 x 500 }{25^{2} }\) = 1.07 x 10⁻⁸N
Given:
Mass of objects,
\(m_1 = 200 \ kg\)\(m_2 = 500 \ kg\)Distance,
\(r = 25 \ m\)We know,
\(G = 6.67\times 10^{-11} \ Nm^2/kg^2\)As we know the relation,
→ \(F_G = \frac{Gm_1m_2}{r^2}\)
By substituting the values, we get
\(= 6.67\times 10^{-11}\times \frac{200\times 500}{(25)^2}\)
\(= 1.0672\times 10^{-8} \ N\)
Thus the above answer is right.
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on a cold day you inhale of air at , and its temperature is raised to . assume that the pressure of the air remains a constant during this process. what is the total change (in joules) in thermal energy of the air you inhaled?
Answers
The total change in thermal energy of the air you inhaled is approximately 158872.5 joules.
To calculate the total change in thermal energy of the air you inhaled, we can use the specific heat capacity equation:
Q = m * c * deltaT
where Q is the total change in thermal energy, m is the mass of the air, c is the specific heat capacity of air, and deltaT is the change in temperature.
We can assume that the pressure of the air remains constant, so we can use the equation for constant pressure processes:
Q = m * Cp * deltaT
where Cp is the specific heat capacity at constant pressure.
The mass of air inhaled is not given, but we can assume it is approximately equal to the volume of air inhaled, which is typically around 0.5 liters or 0.5 kg.
The specific heat capacity of air at constant pressure, Cp, is approximately 1005 J/kg*K.
The change in temperature, deltaT, is (32 - (-10)) = 42 degrees Celsius, which is equivalent to 42 + 273.15 = 315.15 Kelvin.
Plugging in the values, we get:
Q = 0.5 kg * 1005 J/kg*K * 315.15 K = 158872.5 J
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why can't you get all the dust off your car by just squirting water from a hose onto it? why can't you simply remove dust just by blowing across a surface? why does dust cling to a fast rotating fan? how can a leaf stay on a car moving at high speed?
Answers
It all happens because of the law of Inertia.
The Newton's first law which is also called the law of inertia states that when a body is moving or at rest, it tends to be in the same state state until an external force is applied to it.
The dust particles can't be removed just by squirting water as the water may become stagnant and the dust particles will get mixed up with water by making a heterogenous mixture and they can remain there. Thus, a large pressure should be applied with a large amount of force which can remove the particles.
The same goes with other dust particles, they can't be removed until an external force is applied so that they leave the surface and fall off. Here, newton's first and second law works.
The leaf remains on the car because the force applied by the air on the opposite is more to make the leaf stay or sometimes they get stuck in a part of a car from where it can't be flown until a great amount of force is applied. Here, Newton's third law works.
Therefore, everything is controlled by the Newton's laws of motion.
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A tennis ball is thrown straight up into the air with an initial velocity of 9.5 m/s. How long does it take to reach the top of the trajectory?
Answers
Answer:
0.969 s (3 s.f.)
Explanation:
Constant Acceleration Equations (SUVAT)
\(\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}\)
When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.
Acceleration due to gravity: g = 9.8 ms⁻²
Resolving vertically, taking up as positive:
u = 9.5 m/sv = 0 m/sWhen projected objects reach the top of their motion, they stop momentarily. Therefore, the velocity v is zero at that point.a = -9.8 m/s²
As g always acts downwards and up is taken as positive, acceleration is negative.
\(\begin{aligned}\textsf{Using} \quad v&=u+at:\\\\0&=9.5+(-9.8)t\\-9.5&=-9.8t\\t&=\dfrac{-9.5}{-9.8}\\t&=0.9693877551\\\implies t&=0.969\; \sf s\;(3\:s.f.)\end{aligned}\)
Therefore, it takes 0.969 s (3 s.f.) for the tennis ball to teach the top of its trajectory.
Which of the following careers would physicists be least qualified to perform,
based on their training?
A. Nuclear engineer
B. Research lab manager
C. Solar panel designer
D. Gardener
SUBMIT
Answers
Very low temperature molecular clouds emit most of their light in which part of the electromagnetic spectrum?
Answers
The radio region of the electromagnetic spectrum is where molecular clouds with extremely low temperatures emit the majority of their light.
To find the answer, we need to know more about the molecular clouds.
What is molecular clouds?Only within molecular clouds can stars actually form. Because the internal forces operating "outward" to prevent a collapse must be greater than the gravitational force acting to collapse the cloud, this is a natural result of their high densities and low temperatures.At 10 K, molecular clouds are extremely cold. Clouds that are diffuse are usually 100 K. Depending on the abundances of heavy elements that provide the cooling radiation, HII areas have T 8000 K.Thus, we can conclude that, the radio region of the electromagnetic spectrum is where molecular clouds with extremely low temperatures emit the majority of their light.
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A man lifts a bucket of water from a well that is 7 meters deep. The bucket and water together weigh 50 Newtons. He turns the crank handle with a force of 5 Newtons. The effort force is blank. (Fill in the blank)
A) 70 meters
B) 5 N
C) 50 N
D) 25 N
Answers
Answer:
Work = Work out
Work in = 5 N * d where d is the distance the handle travels
Work out = 50 N * 7 m = 350 Joules
d = 50 N * 7m / 5 N = 70 m
This is the distance traveled by the force of 5 N
A man lifts a bucket of water from a well that is 7 meters deep. The bucket and water together weigh 50 Newtons. He turns the crank handle with a force of 5 Newtons. The effort force is 70 Newtons.
What is Effort force?If a force is applied for a machine to move or change the position of the object is known as Effort force.
The effort force formula can be described as,
Fe = Fl. dl / de
Fe is effort force (N, lb)
Fl is load force (N, lb) (note that weight is a force)
dl is distance from load force to fulcrum (m, ft)
de is distance from effort force to fulcrum (m, ft)
Here, the given data to find the effort force is,
Fl =50 Newtons
dl = 7 meters
de = 5 Newtons.
Substituting all the values, we get,
Fe = 350/5
Fe = 70 Newtons.
Thus, the effort force is 70 Newtons.
Hence, Option A is the correct answer.
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Montesquieu believed that in order for one person not to have all the power government should
Answers
Answer:
Montesquieu called the idea of dividing government power into three branches the "separation of powers." He thought it most important to create separate branches of government with equal but different powers. That way, the government would avoid placing too much power with one individual or group of individuals.
Explanation:
Define G and give its value.
Answers
An empty space defined by its surround is known as ________ shape.
Answers
the decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is 10^-10 watt/m2.
the level of sound in the quiet room is ____ dB, and the intensity of sound in the busy street is ____ watt/m^2.
Use the formula β = 10log(I/Io) , where β is the sound level in decibels, l is the intensity of sound, and Io is the smallest sound intensity that can be heard by the human ear (roughly equal to 1x10^-12 watts/m^2)
Answers
The level of sound in the quiet room is 20db and the intensity of sound in the busy street is \(l_{2} = 10^-^5 W\cdot m^-^2\)
Note, β = 10log(I/I₀)
Lets find level of sound in the quiet room given:
I = 10⁻¹⁰ W·m⁻²
I₀ = 1 × 10⁻¹² W·m⁻²
\(\beta = 10log[(10^-^1^0/(1 * 10^-^1^2)] = 10log(10^2) = 10 * 2 = 20 dB\)
Sound level in the quiet room is 20db
Lets find the intensity of sound in the busy street given:
β(street) - β(room) = 50 dB
Let us denote the intensity level equation
\(\beta = 10logI - 10 logl_{0}\)
Let A = the room and B = the road. Then,
(A) β₂ = 10logI₂ - 10logI₀
(B) β₁ = 10logI₁ - 10log I₀
Lets subtract (B) from (A)
\(\beta_{2} - \beta_{1} = 10logl_{2} - 10logl_{1}\)
\(50 = 10logl_{2} - 10log(10^-^1^0)\)
Lets divide each side by 10
\(5 = logl_{2} - log(10^-^1^0)\)
\(5 = logl_{2} - (-10)\)
\(5 = logl_{2} + 10\)
Lets subtract 10 from each side:
\(-5 = logl_{2}\)
Collect antilog of each side:
\(l_{2} = 10^-^5 W\cdot m^-^2\)
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Which equation describes the sum of the two vectors plotted below?
A. r=x+ý
B. r = x + 4y
C. r= 2x 1 3y
D. r 4X+ ý
Answers
The equation which describes the sum of the two vectors plotted is x + 4y; option A.
What is a vector?A vector is a quantity that has both magnitude and direction.
From the graph:
a = (-2,3)
b = (1,4)
Vector, OA = -2x + 3y
Vector, AB = 3x + y
Using the triangular law of the vector addition;
r = -2x + 3y + 3x + y
r = x + 4y
In conclusion, the triangular law of vector addition is useful in adding vectors.
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Hey!!
I need help in a question...
• Different types of fuels and the amount of pollutants they release.
Please help me with the question.
Thankss
Answers
Answer: Different types of fuels have varying compositions and release different amounts of pollutants when burned. Here are some common types of fuels and the pollutants associated with them:
Fossil Fuels:
a. Coal: When burned, coal releases pollutants such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM).
b. Petroleum (Oil): Burning petroleum-based fuels like gasoline and diesel produces CO2, SO2, NOx, volatile organic compounds (VOCs), and PM.
Natural Gas:
Natural gas, which primarily consists of methane (CH4), is considered a cleaner-burning fuel compared to coal and oil. It releases lower amounts of CO2, SO2, NOx, VOCs, and PM.
Biofuels:
Biofuels are derived from renewable sources such as plants and agricultural waste. Their environmental impact depends on the specific type of biofuel. For example:
a. Ethanol: Produced from crops like corn or sugarcane, burning ethanol emits CO2 but generally releases fewer pollutants than fossil fuels.
b. Biodiesel: Made from vegetable oils or animal fats, biodiesel produces lower levels of CO2, SO2, and PM compared to petroleum-based diesel.
Renewable Energy Sources:
Renewable energy sources like solar, wind, and hydropower do not produce pollutants during electricity generation. However, the manufacturing, installation, and maintenance of renewable energy infrastructure can have environmental impacts.
It's important to note that the environmental impact of a fuel also depends on factors such as combustion technology, fuel efficiency, and emission control measures. Additionally, advancements in clean technologies and the use of emission controls can help mitigate the environmental impact of burning fuels.
Pre-Test Active
TIME REMAINING
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Which arrow represents the change of state described
above?
The diagram shows changes of state between solid,
liquid, and gas. The atoms of a substance lose energy
during a change of state. Before the change, the atoms
are close together but are able to slide past one
another.
M
N
P
gas
Q
S
lid
P
ZO
liquid
Answers
n is the answer I guess
not so sure
A video-disc player that is not playing still uses 6. 0w of power. What is the current into the video-disc player if it is plugged into a standard 130v outlet
Answers
A video-disc player that is not playing still uses 6.0 W of power and is plugged into a standard 130 V outlet. So the electric current it has is 0.04 Amps
According to international units, the formula for calculating electric power is P = V x I, where P is electric power (W), V is electric voltage (V), and I is electric current (A). So, to calculate the current on the video disc player is:
I = P/V
In terms of the electric power is 6.0 W and the electric voltage is 130 V, then the electric current is:
I = P/V
I = 6.0W/130V
I = 0.04 Amps
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The power ratings of several motors are listed in the table. A 2 column table with 3 rows. The first column is labeled motor with entries, brand X, brand Y, brand Z. The second column is labeled Power in watts with entries 7460, 7650, 7580. An advertising agency writes marketing material for a new motor (Brand W) that has a power rating of 7,640 W. Which statement comparing the motors can they truthfully use? Brand W motor can finish any job faster than Brand Y motor can. There’s not a more powerful motor available. Brand W motor does more work each second than Brand X or Brand Z. Every second, Brand W motor does 7,640 N of your toughest work.
Answers
The statement " Brand-W motor does 7,640 N of your toughest work." can be truthfully use.
Advertisement Rules:
An advertiser can not compare its products using the other companies name.An advertiser can not make the false statement in its advertisement.Here, the brand-W has the power rating of 7,640 W that is less than brand-Y. Advertiser cannot compare his brand using the name of Brand X, Y, or Z.
Therefore, the statement " Brand-W motor does 7,640 N of your toughest work." can be truthfully use.
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Answer:
The correct answer is C, Brand W motor does more work each second than Brand X or Brand Z.
On the weather map, what does the symbol shown below represent?
A circle is shown with a slanting line. There are three ticks at the tip.
Cloud cover
Flurries
Snow
Wind speed
Answers
Answer:
wind speed i think where i live?
Answer:
Wind speed.
Explanation:
I took the test and I promise this is right.
Information about mars' moons.
Answers
Answer:
mars is a fourth planet of the sun and the second planet in the solar system
moon is a natural satellite of the earth it isthe fifth largest moon in the solar system
The nucleus and the _____ are held together by the electrostatic force.
Answers
Answer:
should be chemical bond
Explanation:
A cup of coffee with cooling constant k = -0.09 is placed in a room temperature of 18°C. If the coffee is served at 93 °C, how long will it take to reach a drinking temperature of 73 °C?
Answers
The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.
The cooling law is given by:
$$\frac{dQ}{dt}=-k(T-T_0)$$
where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.
We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.
Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.
Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:
dQ = - dQ where dQ is the heat energy gained by the environment.
We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.
We can rearrange the equation as follows:
$$-\frac{dQ}{dt}=k(T-T_0)$$
$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$
$$\frac{d}{dt}T=-k(T-T_0)$$
The differential equation above can be solved using separation of variables as follows:
$$\frac{d}{dt}\ln(T-T_0)=-k$$
$$\ln(T-T_0)=-kt+c_1$$
$$T-T_0=e^{-kt+c_1}$$
$$T=T_0+Ce^{-kt}$$
where C = e^(c1).
We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.
$$T=T_0+Ce^{-kt}$$
$$73=18+C\cdot e^{-0.09t}$$
$$55=C\cdot e^{-0.09t}$$
$$C=55e^{0.09t}$$
$$T=18+55e^{0.09t}$$
We can now solve for the value of t when T=93 as follows:
$$93=18+55e^{0.09t}$$
$$e^{0.09t}=\frac{93-18}{55}$$
$$e^{0.09t}=1.3636$$
$$t=\frac{\ln(1.3636)}{0.09}$$
Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.
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The human hearing range is approximately 20 Hz to 20,000 Hz. What are the wavelengths of sound corresponding to 20 Hz
Answers
The speed of sound in air at standard temperature and pressure (STP) is roughly 344 meters per second (1,129 feet per second), or roughly 1,236 kilometers per hour.
Sound is a pressure wave that travels through a medium and propagates through that medium as a wave. When a sound wave passes through a medium, it causes molecules in that medium to vibrate, which produces a pressure wave. The speed of sound in air at standard temperature and pressure (STP) is roughly 344 meters per second (1,129 feet per second), or roughly 1,236 kilometers per hour (768 miles per hour).The wavelength of a sound wave is defined as the distance between corresponding points on two adjacent waves. In other words, it is the distance from one crest (peak) of a wave to the next crest or from one trough (low point) to the next trough. The symbol λ (lambda) represents the wavelength. Wavelength is usually measured in meters. The human hearing range is approximately 20 Hz to 20,000 Hz. When 20 Hz is the frequency of the sound wave, the wavelength is found as follows:λ = v/fλ = 344/20λ = 17.2 mTherefore, the wavelength of sound corresponding to 20 Hz is 17.2 meters.
The wavelength of sound can be calculated by dividing the speed of sound by the frequency of the sound wave. The human hearing range is approximately 20 Hz to 20,000 Hz. When 20 Hz is the frequency of the sound wave, the wavelength is 17.2 meters.
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Please heeelp meeeeeeeeee
Answers
Source trust me
An axially loaded short column has length of 3.5m carries factored load of 1600KN. Concrete fc'=28MPA and Fy=420 MPA. Maximum aggregate size is 19mm. Calculate the suitable dimensions for tied and spiral columns.qr 1. Calculate • Required loads • Stresses • Gross area • Area of steel • Design satisfies risk assessment against use Appropriate reinforcement SELECTION • All relevant checks to make design safe
Answers
The suitable dimensions for tied and spiral columns of Required loads, Stresses, Gross area, Area of steel are 1142.86 kN, 12.6 MPa, 90.89 m².
The required loads can be determined by dividing the factored load by the appropriate load factor. For this example, let's assume a load factor of 1.4. Required loads = Factored load / Load factor
= 1600 kN / 1.4
= 1142.86 kN
Determine the allowable stresses: a concrete compressive strength of fc' = 28 MPa, the allowable compressive stress (fa) can be calculated using the formula:
= 0.45 * 28 MPa
= 12.6 MPa
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