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2 years ago

How rolling friction is less than sliding friction?

1 answer:

6 0

Rolling friction is considerably less than sliding friction as there is no work done against the body that is rolling by the force of friction. For a body to start rolling a small amount of friction is required at the point where it rests on the other surface, else it would slide instead of roll.

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Imagine you transfer heat into a gas. This heat splits up in two different ways: Additional thermal energy making the gas hotter

navik [9.2K]

Answer:

<u>36% of the initial heat can be used to do work.</u>

Explanation:

The initial heat is the 100%, i.e. it is all the heat that will be transferred.

It wil be transferred into two different kinds of energy:

additional thermal energy that will increase the thermal energy of the gas, making it hotter. Call it U. U = 64%. And,

"fuel" for the gas to do work. Call it W.

Then,

100% = U + W

W = 100% - U

W = 100% - 64% = 36%

That is, 36% of the initial heat is available to do work.

7 0

2 years ago

What can you conclude about the total mechanical energy of a pendulum as it swings back and forth?

Alchen [17]

Answer:

The total mechanical energy of a pendulum is conserved neglecting the friction.

Explanation:

When a simple pendulum swings back and forth, it has some energy associated with its motion.
The total energy of a simple pendulum in harmonic motion at any instant of time is equal to the sum of the potential and kinetic energy.
The potential energy of the simple pendulum is given by P.E = mgh
The kinetic energy of the simple pendulum is given by, K.E = 1/2mv²
When the pendulum swings to one end, its velocity equals zero temporarily where the potential energy becomes maximum.
When the pendulum reaches the vertical line, its velocity and kinetic energy become maximum.
Hence, the total mechanical energy of a pendulum as it swings back and forth is conserved neglecting the resistance.

8 0

3 years ago

I need help in physics please help me

artcher [175]

The first step is to represent the vectors shown in the image in Cartesian coordinates.

For the vector C we have a magnitude of 4.8 and an angle 22 ° with the axis -y (direction j)

To write this vector in Cartesian coordinates we must find its component in x (address i) and in the y axis.

$x = 4.8sin(22)i\\\\y = 4.8cos(22)(-j)$

So:

$C = 4.8sin(22) i + 4.8cos(22)(-j)\\\\C = 1.798\ i - 4.450\ j$

For Vector B we have a magnitude of 5.6 and an angle of 33 with the -x axis (-i direction)

So:

$x = 5.6cos(33)(-i)\\\\y = 5.6 sin(33)(-j)$

So:

$B = 5.6cos(33)(-i) + 5.6sin(33)(-j)\\\\B = -4.696\ i - 3.05\ j$

Finally the sum of B + C is made component by component in the following way:

$F = (-4.696 +1.798)i + (-4.450 - 3.05)j\\\\F = -2.898\ i - 7.5\ j$

Finally the magnitude of f is:

$|F| = \sqrt{(-2,898)^2 + (-7.5)^2}$

| F | = 8.04

3 0

3 years ago

How do protons ever fuse together in the presence of the electromagnetic force? There is another force involved here called the

zepelin [54]

Answer:

The nuclei are moving fast with respect to one another

Explanation:

Protons are found in the nucleus together with the neutrons while the electrons normally revolve round it.

However the protons appears fused in a way when electromagnetic force is applied by the nuclei moving at a very fast speed. This fast speed helps to keep the supposed neutrons fused together.

7 0

3 years ago

Law of Conservation of Energy.

Tems11 [23]

Energy cannot be created nor be destroyed

3 0

3 years ago