Advertisements
Advertisements
प्रश्न
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
Advertisements
उत्तर
Mass of the body, (m) = 50 kg
Height above the ground, (h) = 72 m
Acceleration due to gravity, (g) = 9.8 m/s2
We can calculate the work done against gravity as,
Work done in lifting a body = Weight of body × Vertical distance
So,
W = m × g × h
So work done,
W = 50 × 9.8 × 72 J
= 35280 J
So, the work done by the man is 35280 J.
APPEARS IN
संबंधित प्रश्न
A coolie does no work against the force of gravity while carrying a luggage on a road.
The energy of a body is its capacity to do .........
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
What are the quantities on which the amount of work done depends? How are they related to work?
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
State the conditions of equilibrium for a rigid body.
How much energy is gained by a box of mass 20 kg when a man, runs carrying the box with a speed of 3 m/s-1 to catch the bus?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
