Advertisements
Advertisements
Question
Advertisements
Solution
Given, mass of water = 80 kg
height = 20 m
g = 10 ms-2
time taken = 10s
Work done = mgh = 80 x 10 x 20 = 16000 J
Power = `"work done"/"time taken" = 16000/10 = 1600 "watt"`
APPEARS IN
RELATED QUESTIONS
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Explain the difference between a uniform linear motion and a uniform circular motion.
On what factors does the work done by a force depend?
Fill in the boxe to show the corresponding energy transformation.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
What should be the characteristic of a source of energy?
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
