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3 years ago

Discuss how energy conservation applies to a

Physics

1 answer:

timofeeve [1]3 years ago

4 0

Answer:

a) in the upper position. b) in the lower position. c) in the lower position. d) in the upper position. f) Its kinetic and potential energy will be 0, but the energy is transferred to the element or body that stopped the movement of the pendulum

Explanation:

In the attached image we have the sketch of a pendulum system.

A) The potential energy is maximum when the pendulum is in the upper position (image, fig 1) because the elevation (h) is maximum with respect to the reference point.

B) the potential energy is minimum when the pendulum is in the lower pasition (image, fig 2) because the elevation (h) is cero with respect to the reference point.

Note: When the pendulum is coming down the potential energy is transforming in kinetic energy.

C) The kinetic energy is maximum when the pendulum is in the lower position (image, fig 2), because the potential energy has been transformed in kinetic energy.

D) The kinetic energy is maximum when the pendulum is in the upper position (image, fig 1) because at this moment the pendulum is at rest it means its velocity is 0. We know that the kinetic energy depends on the velocity.

f) The energy is transferred to the element or body that stopped the movement of the pendulum

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Which statements describe how a machine can help make work easier? Select two options.

ad-work [718]

Answer:

It can put out more force than the input force by decreasing the distance through which force is applied.
It can apply a force to an object in a different direction than the force applied to the machine.

Explanation:

Assuming the machine is a simple machine, such as a lever or pulley, the machine will not do any more work than is put into it. However, it can change the magnitude or direction (or both) of the input force required to achieve a particular output force.

Because the machine does not increase the work done, if the output force is greater, the output distance must be less.

The applicable observations are ...

It can put out more force than the input force by decreasing the distance through which force is applied.
It can apply a force to an object in a different direction than the force applied to the machine.

6 0

3 years ago

You need to design an experiment to measure the free-fall acceleration. You have an inclined plane made of steel and several obj

Nataliya [291]

Attached a diagram of the scheme described in the problem ..

To solve the problem we need to know the relationship between kinetic and normal force, so

$F_k=\mu_k F_N (1)$

Where

$\mu_k =$ coefficient of kinetic

$F_N=$ Normal force

We perform the sum of forces as well,

$\sum F_x = Ma$ (2)

$a= Acceletarion$

For Normal Force in Y,

$F_N= Mgcos \theta$ (3)

The force in X,

$\sum F_x = Mgsin\theta - F_x$ (4)

Replacing in (4)

$Ma = Mgsin\theta - \mu_k F_N$

$Ma = Mgsin\theta - \mu_k Mg cos\theta$

$a= g(sin\theta-\mu_k cos\theta)$

In this way, it does not matter which object is chosen.

6 0

3 years ago

What element x is most likely to react to form the compound xf5?

djyliett [7]

<span>antimony. It has +3,+5,-3 so yeah. the others carbon+2,+4,-4, chlorine +1,+5,+7,-1 but -1 is the most often so it isn't Cl, calcium +2.</span>

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4 years ago

If the frequency of wave is 400 Hz and its wavelength is 2.5 m,<br> what is the velocity?

BigorU [14]

1000 m/s

You have the wavelength and frequency, you just need to solve for velocity. You can do this by multiplying each side of the equation by frequency.

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3 years ago

A quarterback passes a football to a receiver on a windless day. Why are the initial horizontal speed (just as it leaves the qua

galina1969 [7]

Think of this as a parabola, there is no resistance but what comes up must come down, which would represent gravity, therefore your answer would be A.

6 0

3 years ago