Advertisements
Advertisements
प्रश्न
How much energy is gained by a box of mass 20 kg when a man, raises the box by 0.5 m in order to place it inside the bus? (g=10 m/s-2)
उत्तर
Height to which the box is raised h = 0.5 m
∴ Energy gained = mgh
= 20 × 10 × 0.5 m
= 100 J
APPEARS IN
संबंधित प्रश्न
Write the expression for the gravitational potential energy explaining the meaning of the symbols used.
Define the term potential energy of a body.
The potential energy of a body is the energy by virtue of its ______.
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed v = 2 m s-1. What potential energy did the spring possess when compressed?
Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of their potential energies?
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
What is the difference between gravitational potential energy and elastic potential energy? Give one example of a body having gravitational potential energy and another having elastic potential energy.
Which of the following is the example potential energy?
What energy is possessed by stretched rubber?
