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3 years ago

11.

Physics

2 answers:

Reika [66]3 years ago

8 0

If a person is pushing a desk across the room, then there is an applied force acting upon the object.

Answer: Option C

Explanation:

As Newton stated in its first laws of motion that any object cannot undergo change in its state of motion or rest until and unless an external unbalanced force acts on the object. So, in order to push the table across the room, the unbalanced force must be applied on the table by the person.

And this external unbalanced force should be more than the frictional forces between the bottom of desk and surface of floor. So the force that is used to push a desk across the room is termed as applied force as the force is applied on the surface of the desk.

Hoochie [10]3 years ago

7 0

C. is correct : ) it is applied when you push and that causes the desk to move

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Answer:

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Explanation:

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4 years ago

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Select the situation for which the torque is the smallest.

alina1380 [7]

Answer:

e. The torque is the same for all cases.

Explanation:

The formula for torque is:

τ = Fr

where,

τ = Torque

F = Force = Weight (in this case) = mg

r = perpendicular distance between force an axis of rotation

Therefore,

τ = mgr

Here,

m = 200 kg

r = 2.5 m

Therefore,

τ = (200 kg)(9.8 m/s²)(2.5 m)

τ = 4900 N.m

Here,

m = 20 kg

r = 25 m

Therefore,

τ = (20 kg)(9.8 m/s²)(25 m)

τ = 4900 N.m

Here,

m = 8 kg

r = 62.5 m

Therefore,

τ = (8 kg)(9.8 m/s²)(62.5 m)

τ = 4900 N.m

Hence, the correct answer will be:

e. The torque is the same for all cases.

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Answer:

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Explanation:

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