Advertisements
Advertisements
प्रश्न
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
Advertisements
उत्तर
Negative work is done.
Explanation:
When a person climbs a ladder (upward), the displacement covered by the person is opposite to the direction of the force of gravity (downward), so the work done on the person by the force of gravity is negative.
संबंधित प्रश्न
Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
How is the unit horsepower related to the S.I. unit of power?
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
One horse power is equal to ______.
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
What is the work done by the gravitational force on the moon that revolves around the earth?
What happens to the power if the time for doing work is reduced from t second to t/10 second?
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A car in neutral gear is coming down the slope.
