Advertisements
Advertisements
प्रश्न
State the energy changes which take place when:
An air gun is loaded and then fired.
Advertisements
उत्तर
During loading, the mechanical energy changes to the potential energy of spring. On firing, the potential energy of spring changes to the kinetic energy of the bullet.
APPEARS IN
संबंधित प्रश्न
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?
Name the type of energy (kinetic or potential) possessed by the following:
A stone at rest on the top of a building.
A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A compressed spring
State two uses of solar cells.
Give one disadvantage of using a solar cell.
State the energy changes which take place when:
A toy car spring is wound and car is made to run on level floor.
Give one example when:
Chemical energy to electrical energy.
A moving body weighing 400 N possesses 500 J of kinetic energy. Calculate the velocity with which the body is moving. (g = 10 ms2)
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
