Question

A man is climbing a staircase. The energy he uses depends on:
A. The height of the staircase.
B. The weight of his body
C. The time taken to roach the top
D. The mass of his body.

Answer 1

Hint:To solve this question we have to know that, at the point when the man applies power to the steps, the steps apply an equivalent power back. The monitor’s power down is following up on the steps. In the event that the steps began moving downwards, you could state the man is tackling the job on the steps. All things considered, the steps don't move; the power is static, and there is no work done on the steps. The steps give an equivalent and inverse response upwards; yet the man is moving, so there is work done on the man by the steps.

Complete answer:
We know that, when a man is climbing a staircase, the energy will be a form of potential energy. The potential energy,
\[PE = mgh\]
We know, here m is the mass, h is the height of the staircase and g is the gravitational acceleration. So, from this equation we can say that the height of the staircase, the weight of the body and the mass of the body is responsible for the energy which is used by him.

So, the right answer will be A, B and D.

Note: We have to also know that, by pushing down with a power more prominent than his own weight, the man can utilize the steps to produce an upwards push. The energy for the push doesn't come from the steps however. It comes from the muscles, which get their energy through food.