Explain why rolling friction is lesser than sliding friction
Pls ans this
Answers
Answer:
As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.
Answer:
Sliding friction is the force resisting the motion when a body slides on a surface. The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.
Explanation:
Hope this helps
Related Questions
A car drives 400 meters in 5 seconds. What is the cars speed in m/s?
Answers
Answer:
80/1
Explanation:
to figure out the answer of how many miles/meters per second divide the meters/miles by the second
so 400÷5 would be 80
80 meters per second
hope this helps :))
a certain waffle iron is rated at 0.57 kw when connected to a 120-v source.(a) what current does the waffle iron carry?
Answers
The waffle iron carries a current of 4.75 A.
Power is the rate at which electrical energy is transferred by an electric circuit. It is expressed in watts (W) and is calculated by multiplying the voltage (V) by the current (I),
which is given by the formula:
P = VI.
Electrical power can also be expressed in terms of resistance (R), using the formula:
P = I^2R or P = V^2/R, known as Joule's Law.
here in Question, We can use the formula:
Power (P) = Voltage (V) x Current (I)
Given, power rating of waffle iron = 0.57 kW = 570 W
Voltage (V) = 120 V
We can rearrange the formula to solve for current (I):
I = P / V
Substituting the given values, we get:
I = 570 W / 120 V
I = 4.75 A
Therefore, the waffle iron carries a current of 4.75 A.
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A student designed an experiment to show how water is recycled through the atmosphere. The steps of the experiment are shown below. Boil 500 mL of water in a beaker. Hold a hot glass plate a few inches above the beaker with a pair of tongs. Observe water droplets on the glass plate. The student did not see water dripping off the glass plate as expected because the experiment had a flaw. Which of these statements best describes a method to correct the flaw in this experiment?
Hold the glass plate closer to the beaker.
Boil the water in a pan instead of a beaker.
Take more than 500 mL of water in the beaker.
Use a cold glass plate instead of a hot glass plate.
Answers
The flaw in the experiment on water recycling is that the student did not see water dripping off the glass plate as expected. To correct this flaw, the student should use a cold glass plate instead of a hot glass plate.
The correct option to the given question is option 4.
When the student holds the hot glass plate above the beaker, the water vapor in the atmosphere will come into contact with the cold surface of the plate and condense, forming water droplets. However, if the glass plate is already hot, it will not be able to cool down the water vapor quickly enough for condensation to occur.
By using a cold glass plate, the temperature difference between the plate and the water vapor will be greater, allowing for faster condensation. This will result in water droplets forming on the glass plate and dripping off, demonstrating the process of water recycling through the atmosphere.
Therefore, the correct method to correct the flaw in this experiment is to use a cold glass plate instead of a hot glass plate. This will enable the student to observe water droplets on the glass plate as expected.
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Suppose a spectral line of hydrogen, normally at 500 nm when measured in a lab on Earth, is observed in the spectrum of a star to be at 500.3 nm. This is called a red shift because the wavelength is longer (and red is on the long-wavelength side of the visible spectrum). How fast is the star moving away from Earth? Give your answer in m/s. Hint: follow example 5.6. Compare in particular to the "Check your learning" calculation, and note that larger Δλ means larger speed.
Answers
The star is moving away from Earth at a velocity of 1.8 x 106 m/s.
The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.
The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.
The velocity of a star moving away from Earth can be determined using the equation:
v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).
In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.
The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.
Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.
Therefore, velocity of star 1.8 x 106 m/s.
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Are certain forms or methods of weathering more common in certain environments? For example, where do you think
you'd see exfoliation or ice wedging occur more commonly?
Answers
Answer:
Yes
Explanation:
Certain types of weathering are more common in certain environments than others.
This is very true.
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils. Different forms of weathering are dictated by their geographies on the earth surface. Ice or frost wedging is only possible in temperate or polar regions of the world. Exfoliation is pronounced around the tropical region as series of thermal expansion and contraction is involved. Alternate freezing and thawing which expands cracks is also a geographical phenomenon.which of the following must be true for a gaussian surface through which the net flux is zero? i. there are no charges inside the surface. ii. the net charge enclosed by the surface is zero. iii. the electric field is zero everywhere on the surface.
Answers
The statement ii. "the net charge enclosed by the surface is zero" must be true for a Gaussian surface through which the net flux is zero.
A Gaussian surface is an imaginary closed surface that is used to calculate the electric flux through a given region of space. Gauss's Law states that the net flux through a closed surface is proportional to the net charge enclosed by the surface. Mathematically,
Φ = ∫ E · dA = Q/ε0
where Φ is the electric flux, E is the electric field, dA is the area element, Q is the net charge enclosed by the surface, and ε0 is the electric constant.
For a Gaussian surface through which the net flux is zero, the value of Q must be zero. Therefore, statement ii. "the net charge enclosed by the surface is zero" must be true.
However, statement i. "there are no charges inside the surface" and statement iii. "the electric field is zero everywhere on the surface" need not be true for a Gaussian surface through which the net flux is zero. There could be charges inside the surface that are canceling out each other's fields, or the electric field could be non-zero but symmetrically distributed so that the net flux through the surface is zero.
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Identifying additional ports and connectors
On the Ports and Connectors tabs, select the ports and connector names from the lists.
Answers
Identifying additional ports and connectors is important in ensuring that your devices are compatible and can communicate with each other. A connector is a device that connects two or more components together, while a port is a connection point that allows devices to connect to a computer or other devices.
To identify additional ports and connectors, you can start by looking at the specifications of your devices. The user manual or the manufacturer's website should have information on what types of ports and connectors are available. You can also physically inspect the devices to see what ports and connectors are present.
For example, a computer typically has ports such as USB, HDMI, Ethernet, and audio jacks. These ports allow you to connect various devices such as printers, monitors, and speakers. Other devices such as smartphones, cameras, and gaming consoles may have their own unique ports and connectors.
By identifying additional ports and connectors, you can expand the functionality of your devices and make them more versatile. It also allows you to connect your devices to a wider range of peripherals and accessories, making your computing experience more efficient and enjoyable.
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What is the fraction of the hydrogen atom's mass (11h) that is in the nucleus? the mass of proton is 1.007276 u, and the mass of 11h atom is 1.007825 u
Answers
The mass fraction of the hydrogen atom is 0.9995 u.
Calculation:We know that mass fraction can be determines as,
Mass fraction = Mass of proton/mass of H atom
Given,
Mass of proton = 1.007276 u
Mass of H atom = 1.007825 u
Put the values in the formula,
Mass fraction = Mass of proton/mass of H atom
Mass fraction = 1.007276/1.007825
= 0.9995 u
Hence, the mass fraction of the hydrogen atom is 0.9995 u.
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Which scenario is an example of a physical change?
Answers
Answer: lead is melted into a liquid to form pellets
Explanation:You didn’t add the answers to the questions but this question was on my test
Choose the clincher sentence that best restates the following topic sentence.
Scientists recently discovered that fun is not just fun; it's
good for the brain.
O A. Not having fun can be bad for the brain.
O B. Fun is definitely good for the brain!
O C. Sometimes, you can have too much fun for the brain to process.
O D. A fun activity like horseback riding can actually make the brain
smarter.
Answers
Place the main-sequence lifetimes of the following stars in order.
A. the Sun: mass 1M, luminosity 1L
B. Capella Aa: mass 3M, luminosity 76L
C. Rigel: mass 24M, luminosity 85000L
D. Sirius A: mass 2M, luminosity 25L
E. Canopus: mass 8.5M, luminosity 13600 L
F. Achernar: mass 7M, luminosity 3150L
Answers
In conclusion, the order of the stars' main-sequence lifetimes, from longest to shortest, is: the Sun, Sirius A, Capella Aa, Achernar, Canopus, and Rigel.
The main-sequence lifetime of a star refers to the time it spends fusing hydrogen into helium in its core before undergoing significant changes. The more massive a star is, the shorter its main-sequence lifetime. To determine the order of the given stars' main-sequence lifetimes, we compare their masses.
Here are the stars listed in order of increasing main-sequence lifetime:
1. The Sun (mass 1M)
2. Sirius A (mass 2M)
3. Capella Aa (mass 3M)
4. Achernar (mass 7M)
5. Canopus (mass 8.5M)
6. Rigel (mass 24M)
The Sun, being the least massive, has the longest main-sequence lifetime among the given stars. On the other hand, Rigel, with a mass of 24M, has the shortest main-sequence lifetime. The other stars fall in between these two extremes based on their masses.
In conclusion, the order of the stars' main-sequence lifetimes, from longest to shortest, is: the Sun, Sirius A, Capella Aa, Achernar, Canopus, and Rigel.
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The direction equivalent to {40° W of S} is:
A. 40 ° E of S
B. 40° W of N
C. 40° E of N
D. 50° S of W
E. 50° E of N
Answers
Answer:
c
Explanation:
if the current is 3amps and resistance is 10 ohms what is the voltage?
Answers
If the current is 3amps and resistance is 10 ohms, the voltage is 30 V.
Ohm's Law states that voltage is equal to the product of current and resistance.
Using the formula V=IR, where V is voltage, I is current and R is resistance, we can calculate the voltage in this scenario.
So, if the current is 3 amps and resistance is 10 ohms, we can plug in these values in the formula: V= 3A x 10Ω V= 30 volts
Therefore, the voltage in this scenario is 30 volts.
This means that in order to maintain a current of 3 amps through a resistance of 10 ohms, a voltage of 30 volts is required.
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Can be Doppler shifted, reflected, refracted,
diffracted, and can undergo constructive and
destructive interference.
Answers
A wave experiences reflection, refraction, Doppler effect, diffraction, and it can undergo both constructive and destructive interference.
A wave can be defined as a disturbance in a medium that progressively transports energy from its source to another location, without transporting matter.
In Physics, there are two main (2) types of wave and these are;
Mechanical waves: an example is sound wave, which requires a medium for its propagation.Electromagnetic waves: an example is light wave, which doesn't require a medium for its propagation and can travel through a vacuum or an empty space.Basically, some of the phenomenon and properties associated with waves include the following:
I. Doppler shift (Doppler effect).
II. Reflection.
III. Refraction.
IV. Diffraction.
V. Constructive interference.
VI. Destructive interference.
In conclusion, all waveform can be Doppler shifted, reflected, refracted, diffracted, and can undergo constructive and destructive interference.
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In the vertical columns of the periodic table:
Atomic weight increases from top to bottom.
Outer shell electrons increases from top to bottom.
The number of shells increases from top to bottom.
All the physical properties are identical.
Answers
Answer:
C. The number of shells increases from top to bottom
Explanation:
There are some trends about the periodic table, one of them is that in the vertical columns of periodic table, the number of shells increases from top to bottom.
From top to bottom in a periodic table, the number of electrons increases, thus more number of shells are needed to fill these electrons and the number of shells increases or we can say the atomic radius increases from top to bottom.
Hence, the correct option is "C".
3 points
1. Using the digram below, determine which two atoms have the same
atomic number. *
8P
8N
9P
8N
8P
9N
10P
9N
2 and 3
o
2 and 4
1 and 3
ОО
3 and 4
3 points
2. The diagram below is a modern drawing of an atom. Why are no
electrone orbits drawn? *
Answers
Answer:
1 and 2 because atomic number is equal to the numbers of protons in the nucleus
Answer:
yes answer in 1 and 2 these is answer
a single slit forms a diffraction pattern with monochromatic light. the 4th minimum of the pattern occurs at an angle of 35° from the central maximum. how many bright bands are on each side of the central maximum?
Answers
In the diffraction pattern formed by a single slit with monochromatic light, there are three bright bands on each side of the central maximum.
When light passes through a single slit, it undergoes diffraction, resulting in a pattern of bright and dark regions on a screen or surface. The central maximum is the brightest region in the pattern and is located at the center.
The number of bright bands on each side of the central maximum can be determined by counting the bright fringes, also known as minima or maxima. In this case, the problem states that the 4th minimum occurs at an angle of 35° from the central maximum. Since the central maximum is considered the 0th minimum, there are three additional bright bands on each side (4th, 3rd, and 2nd) before reaching the central maximum. Therefore, the total number of bright bands on each side of the central maximum is three.
This pattern is a result of the interference and diffraction of light waves passing through the single slit. The spacing between the bright bands decreases as the order of the minimum increases, leading to a narrower pattern. The exact spacing and positions of the bright bands can be determined using the principles of wave interference and diffraction.
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electronic sensors with a(n) ? output interface can switch ac or dc without the specific polarity requirements for dc circuits.
Answers
Electronic sensors with a digital output interface can switch AC or DC without the specific polarity requirements for DC circuits.
Electronic sensors with a bidirectional output interface can switch AC or DC without the specific polarity requirements for DC circuits. These sensors can handle both types of currents, making them versatile for various applications.
A device that detects a physical property of interest (such as heat, light, or sound) and converts it into an electrical signal so that it may be measured and used by an electrical or electronic system is known as an electrical sensor, also known as an electronic sensor.
The physical activity that needs to be monitored is converted by a sensor into its electrical counterpart, which is then processed so that the electrical signals may be delivered and further processed with ease. The sensor can emit a binary value indicating whether or not an object is present or a digital or analogue value indicating when a measurement value has been attained.
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If the magnitude of the gravitational force of earth on the moon is f, the magnitude of the gravitational force of the moon on earth is.
Answers
The gravitational pull of the moon on Earth has a magnitude of F.
The specified conditions:Magnitude of Earth's gravitational pull on the moon is equal to F.
Applying Newton's third rule of motion, one may calculate the size of the gravitational pull of the Moon on Earth.
Every action has an equal and opposite response, according to Newton's third law of motion.
In other words, the force the Earth exerts on the moon is equivalent to the force the moon exerts on Earth, but in the opposite direction.
FE= -FM
As a result, the Moon's gravitational pull on Earth has a magnitude of F.
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What is the space between to items
Answers
Answer:
A Gap is the space between
Answer: distance, a gap
Explanation:
for a beginner athlete (no experience), what would be an appropriate volume (foot contacts per session) for plyometric training?
Answers
For a beginner athlete with no prior experience, an appropriate volume for plyometric training would be 30 to 60 foot contacts per session.
Plyometric training involves explosive movements that require a high level of strength, power, and coordination. For a beginner athlete, it is crucial to start with a manageable volume to allow the body to adapt and minimize the risk of injury.
By performing 30 to 60 foot contacts per session, the beginner athlete can gradually introduce plyometric exercises into their training routine. This volume provides a balance between challenging the body to adapt and allowing sufficient recovery time. It allows the athlete to focus on mastering the proper technique and form, which is essential for maximizing the benefits of plyometric training.
Starting with a lower volume helps the athlete build a solid foundation of strength and stability while minimizing the stress on the joints, tendons, and muscles. As the athlete progresses and becomes more experienced, they can gradually increase the volume of foot contacts over time.
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determine the force in member bd and the components of the reaction at c if the force applied at a is 330 n. (round the final answers to their nearest whole number.)
Answers
The force in member BD is 330 N, and the reaction at C consists of two components: 130 N along the x-axis and 200 N along the y-axis.
What is force?
A force is indeed an influence that really can alter an object's motion according to physics. A motion of an object to mass to accelerate when it changes its velocity, such as when it moves away from rest. An intuitive way to describe force is as a push or a pull. A force is a vector quantity because it has both direction and magnitude. It is calculated using the newton SI unit (N). Force is denoted by the letter F. (formerly P). The net force acting on an object is proportional to the frequency that its momentum changes over time, according to Newton's second law in its original formulation.
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Can someone please help me with this lesson outline?
Answers
B. The Moon's Formation
1. Scientists hypothesize that the Moon formed from rock that was in a ring around Earth. This ring formed when Earth collided with an object about the size of Mars.
2. Craters form when objects impact into the surface of another object.
a. Light-colored streaks called rays extend in all directions from some craters.
b. On Earth, wind, water, and plate tectonics have erased craters. The Moon has no wind, water, or plate tectonics.
3. Large, flat areas on the Moon are called maria. They formed after most impacts on the Moon's surface had stopped; lava flowed up through the Moon's crust and solidified, covering many craters and other features and then solidifying.
4. Highlands are light-colored areas on the Moon's surface.
C. The Moon's Motion
The amount of time it takes the Moon to revolve once around Earth is the same as the amount of time it takes the Moon to make one rotation. One revolution of the Moon around Earth takes 27.3 days.What is the Moon's Formation about?In terms of formation, scientists hypothesize that the Moon formed from rock that was in a ring around Earth after a collision with an object the size of Mars. This collision caused debris from Earth to be ejected into space, eventually coming together to form the Moon.
Therefore, this passage also explains how craters form on the Moon's surface when objects impact into it. Some craters have light-colored streaks called rays that extend in all directions from them. The Moon's lack of wind, water, and plate tectonics has prevented these craters from being erased like they are on Earth.
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See text below
B. The Moon's Formation
1. Scientists hypothesize that ---formed from rock that was
in a ring around Earth. This ring formed when -- collided with an object about the size of Mars.
2. Craters form when objects ----into the surface of another object.
a. Light-colored streaks called ---extend in all directions from some craters.
b. On Earth, wind, water, and plate tectonics have erased craters. The ----- has no wind, water, or plate tectonics.
3. Large, flat areas on the Moon are called -----They formed after most impacts on the Moon's surface had stopped; lava flowed up through the Moon's crust and solidified, covering many craters and other features and then solidifying.
4. ----are light-colored areas on the Moon's surface.
C. The Moon's Motion
1. The amount of time it takes the Moon to revolve once around Earth is ----
the amount of time it takes the Moon to make one rotation. One revolution of the Moon around Earth takes -----days.
2. If an object has two forces acting on it, how can the net force equal
0?
Answers
Answer:
if they both face each other they cancel out
Explanation:if there is one on 1 side and on the other as well they cancel out and it is 0
Answer:
If the forces are equal and the forces act in oppposite direction then the net force is equal to zero
Find the force required to do 25 joule work when the force causes a displacement of 0.5m
Answers
Answer: Force required to 25 joule work when the force causes a displacement of 0.5m is 50N
Explanation: To calculate the work done we use the formula
W=F.s (1)
W= work done
F= force applied s= displacement
Given, work done W= 25 joules= 25 J
displacement s= 0.5m
∴From equation (1) we get the force required when work is done and displacement is given, that is
F\(=\frac{W}{s}\) (2)
∴Force required \(F=\frac{W}{s}= \frac{25J}{0.5m}=50N\)
(1 J is the work done by a force of 1 N acting over a displacement of 1 m and so 1 J= 1 Nm⇒ 1 N = 1 J/m)
ANS: Force required to do 25 J work when a force causes displacement of 0.5m = 50 N
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Describe something Joule believed that contradicted the beliefs of his peers.
Answers
Answer:
Joule, a 19th-century physicist, believed in the conservation of energy, which contradicted the beliefs of his peers at the time. His contemporaries believed that energy was a substance that could be created or destroyed. In contrast, Joule believed that energy could only be transformed from one form to another but could never be created or destroyed. He demonstrated this through a series of experiments where he showed that heat and mechanical work were equivalent forms of energy and that the total amount of energy in a closed system remained constant.
Joule's ideas challenged the established scientific beliefs of his time. They paved the way for the development of the first law of thermodynamics, which states that the total energy in a closed system is constant and cannot be created or destroyed. By proposing and demonstrating these ideas, Joule made significant contributions to the development of classical physics and helped lay the foundations of modern energy science.
Answer:
James Prescott Joule was a 19th-century British physicist who made significant contributions to the study of thermodynamics. One of his beliefs that contradicted the beliefs of his peers was the idea that heat was a form of energy.
At the time, the prevalent belief was that heat was a fluid-like substance called "caloric" that flowed from hot objects to cold objects. Joule challenged this idea and proposed that heat was actually a form of energy that could be transformed into other forms of energy, such as mechanical energy.
Joule's work showed that heat was a conserved quantity, much like energy, and that it could be quantified in terms of work done. This was a significant departure from the prevailing ideas of the time and helped lay the foundation for the study of thermodynamics.
take some time to play around with the simulation and then answer the following questions: q10: at what position does the skater have the most potential energy? at what position does the skater have the most kinetic energy? q11: how does the magnitude of the maximum kinetic energy of the skater compare to the magnitude of the maximum potential energy of the skater? q12: what do you notice about the relationship between the potential energy, kinetic energy, and total energy in the bar graph while the simulation is running?
Answers
The skater has the maximum potential energy at the top of the slope.
Capacity power is the power held with the aid of an object because of its position relative to other gadgets, stresses within itself, its electric charge, or different elements.
Ability strength, stored electricity that depends upon the relative function of numerous parts of a machine. Spring has more potential energy when it's far compressed or stretched.
Capacity electricity is power an item has due to its function relative to some different item. whilst you stand at the pinnacle of a stairwell you have got greater capability power than while you are at the lowest, due to the fact the earth can pull you down thru the pressure of gravity, doing paintings in the procedure.
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If a suitcase has a mass of 20 kg, what is the force of gravity acting on it?
Answers
Explanation:
Assuming the suitcase is near the surface of the earth, g = 9.8 m/s².
F = ma
F = (20 kg) (9.8 m/s²)
F = 196 N
the latent heat of fusion of a substance is the amount of energy associated with doing which of the following to 1 kg of the substance
A. Buring it completely
B. Raising its temperature 1 c
C. Boiling it at its boiling point
D Melting it at its melting point
Answers
Answer:Boiling at its boiling point
Explanation:
The number after oxygen is called a what in this reaction 2AI2O3(s)+energy 4AI(s) +302(g) ??
Will give 15 pointssss need it ASAP.
Answers
Answer:
A subscript
Explanation:
it tells you how many oxygen molecules there are in the equation