A toy elevator is raised from the ground floor to the second floor in 20 seconds

Question

A toy elevator is raised from the ground floor to the second floor in 20 seconds using 1000 J of work, is 1000 w. 20,000 w 20 w. 50 w. Impulse involves the time that a force acts, whereas work involves the When a molecule collides with another that is approaching with greater rebound speed stays the same, increases, decreases. and when a molecule collides with another that is receding, its rebound stays the same. increases. decreases. A moving van with a stone lightly glued to the midpoint of its ceiling velocity. When the glue gives way, the stone tails and hits the floor behind the midpoint of the ceiling. ahead of the mid exactly below the midpoint of the ceiling. none of the Whirl a rock at the end of a string and it follows a circular path. If the strin the rock is to slow down. stop. follow a straight-line path. follow a circular you toss a coin straight upward in train that slows while the coin is in as if you were at rest. in front of you.

Explanation / Answer

1 ans

Work W=1000J

Time t=20 seconds

This concept belongs to work energy and power

According to work energy theorem

Power=work/time=1000/20=50W

So the option is D

2 ans

Work involves the displacement that force acts

Because impulse=force×time

Work=force × displacement

The option is a

3 ans.

The molecule collides with another molecular that contains greater momentum the rebound velocity of first molecule is increase because this type of collision is head - on perfect elastic collision so there momentum s are exchanged so the rebound velocity increases

The option is 2

4 ans.

The molecule collides with another molecular that having receding that low momentum of inertia compare to first molecule the momentum's are exchange after collision so the rebound velocity is dresses

The option is 6

5 ans.

A moving van with a stone lightly glued to the medpoint of celling smoothly the stone velocity when the glue gives the way,the stone falls and hit the floor behind the mid point of celling because the van moving forward direction so we apply breaks the stone moving backward

The option is A

6 ans.

Whirl a rock at the end of string and follows a circular path

If string is break the rock is follow in a straight path

Because the stone obtained the horizontal force

the option is C

7 ans.

If we toss a coin straight upward in the train that slows while the coin is infront of you because the train moves forward the coin motion does not change the person is moves back so the coin drop infront of person

The option is B

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