Question

A bulldozer does 500 Joules of work in 20 seconds. How much power is used?

Answer 1

Given:

The amount of work done by the bulldozer = 500 J

The time required by the bulldozer to do that amount of work = 20 seconds.

To find:

The amount of power used by the bulldozer.

Solution:

Power is given as work done by a system divided by the time taken.

Hence the formula for power will be:

Power = Work/time

= 500/20

= 25 Watts

Thus the power consumed by the bulldozer is 25 watts.

Answer 2

SOLUTION

GIVEN

A bulldozer does 500 Joules of work in 20 seconds.

TO DETERMINE

The power is used

FORMULA TO BE IMPLEMENTED

$\displaystyle \sf{Power = \frac{Work}{Time }}$

EVALUATION

Here it is given that the bulldozer does 500 Joules of work in 20 seconds

So

Work = 500 Joules

Time = 20 Seconds

Hence the power of the bulldozer

$\displaystyle \sf{ = \frac{Work}{Time }}$

$\displaystyle \sf{ = \frac{500}{20 } \: \: \: Joules / Seconds }$

$\displaystyle \sf{ = 25 \: \: Watt}$

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