Advertisements
Advertisements
प्रश्न
Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.
उत्तर
During the vertical fall of ball, if friction due to air is neglected, the total sum of potential energy and kinetic energy at each point of its path remains same.
APPEARS IN
संबंधित प्रश्न
State the energy change in the following device while in use:
A glowing electric bulb.
Name the type of energy (kinetic or potential) possessed by the following:
A bullet fired from a gun.
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.
Name the two groups in which various sources of energy are classified. State on what basis are they classified.
How is the solar energy used to generate electricity in a solar power plant?
How is wind energy used to produce electricity?
Give one example when:
Electric energy changes to potential energy.
A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? [g = 10 ms-2]
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.
A body of mass 50 kg has a momentum of 3000 kg−1 ms. Calculate:
(j) the kinetic energy of the body.
(ii) the velocity of the body.
