Advertisements
Advertisements
Question
A coolie X Carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head move the same distance on a frictionless horizontal platform. Who does more work? Explain the reason.
Solution
Energy is the capacity to do work and work done is equal to energy spent. Coolie X carrying a load up a slope will do more work as this works involve a change in potential energy, kinetic energy and loss of energy due to friction. Work done in carrying the load in horizontal frictionless surface does not involve change in potential energy and work done by the friction is also zero.
APPEARS IN
RELATED QUESTIONS
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
What is meant by a rotatory motion? Give one example.
What do you mean by equilibrium of a body?
What do you mean by a centrifugal force?
1 kWh = ______ J.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
What is the work done by the gravitational force on the moon that revolves around the earth?
State the condition when the work done by the force is positive
State the S.I. and C.G.S. units of energy. How are they related?
For the following scenarios, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
