Advertisements
Advertisements
Question
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
Why is a jack screw provided with a long arm?
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
What is the work done by the moon when it revolves around the earth?
When does a force perform work?
State two advantage of producing hydroelectricity.
State two disadvantages of producing hydroelectricity.
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
Each of the following statement describes a force acting. Which force is causing work to be done?
Why is the work done on an object moving with uniform circular motion zero?
Does the earth move around the sun with a uniform velocity?
Write an expression for work done by a force depends?
Can every force produce work?
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
