Advertisements
Advertisements
Question
The moon is revolving around the earth in a circular path. How much work is done by the moon?
Advertisements
Solution
Work done by the moon is zero as the force of attraction on the moon by the earth is normal to the direction of motion of the moon.
APPEARS IN
RELATED QUESTIONS
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
The work done on an object does not depend on ______.
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Fill in the boxe to show the corresponding energy transformation.
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
