Question

Repeat Question 21 for the power needed instead of the work.

Short answer

(a), (b), (c), and (d)

The required power depends on the height of the table, the time taken, the path of the lift, and the weight of the suitcase.

Step-by-step solution

Understanding of power

The power is expressed as a physical quantity that is equivalent to the work done by a certain body per unit time. In the SI system, the power is represented in the units of a watt (W).

The relation of power is as follows:

\(P = \frac{W}{t}\)

Here, W is the work done, and t is the time taken.

Determine the factors on which power depends upon

The power needed to lift the suitcase relies on the work done, which means that the power will change with a difference in the height of the table and weight of the suitcase.

From the relation between work and power in step-1, it can also be concluded that power depends on the time consumed. Also, as the length of the path changes, the time taken will depend on the path followed, which will affect the required power.

Thus, options (a), (b), (c), and (d) are the correct answers.