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3 years ago

An example of potential energy is a ball sitting _____ of the stairs.

Physics

1 answer:

expeople1 [14]3 years ago

3 0

Answer:

at the top

Explanation:

Potential energy is the stored energy, mechanical energy,

or energy possessed by by virtue of the position of an object.an example of potential energy is the energy that a ball possesses by virtue of its sitting at the top of the stairs it being about to roll down the stairs.

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Find the moment of inertia Ihoop of a hoop of radius r and mass m with respect to an axis perpendicular to the hoop and passing

Juliette [100K]

Answer: MR²

is the the moment of inertia of a hoop of radius R and mass M with respect to an axis perpendicular to the hoop and passing through its center

Explanation:

Since in the hoop , all mass elements are situated at the same distance from the centre , the following expression for the moment of inertia can be written as follows.

I = ∫ r² dm

= R²∫ dm

MR²

where M is total mass and R is radius of the hoop .

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3 years ago

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A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inclined at an angle of14.0° with the horizontal. Using th

mart [117]

The answer is 3.5m/s

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3 years ago

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Galina-37 [17]

Answer:

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Help me pleaseee, it’s due today: Two people push on a large gate as shown on the view from above in the diagram. If the moment

Sladkaya [172]

Answer:

the angular acceleration of the gate is approximately 1.61 $\frac{rad}{s^2}$

Explanation:

Recall the formula that connects the net torque with the moment of inertia of a rotating object about its axis of rotation, and the angular acceleration (similar to Newton's second law with net force, mass, and linear acceleration):

$\sum \tau_1=I\,\alpha$

In our case, both forces contribute to the same direction of torque, so we can add their torques up and get the net torque on the gate:

$\tau_{net}=(20*2+30*3.5) \,N\,m=145\,\,N\,m$

Now we use this value to obtain the angular acceleration by using the given moment of inertia of the rotating gate:

$\sum \tau_1=I\,\alpha\\145\,\,N\.m=(90\,\,kg\,m^2)\,\alpha\\\alpha= \frac{145}{90} \frac{rad}{s^2} = 1.61\, \frac{rad}{s^2}$

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3 years ago