Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
Examples of kinetic energy:
(i) Air in motion has kinetic energy.
(ii) A swinging pendulum
APPEARS IN
संबंधित प्रश्न
How is work related to energy?
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)
State the energy transformation on the following:
Electricity is obtained from solar energy.
What are the units of (a) work, and (b) energy?
Is work done a scalar or a vector physical quantity?
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
Work done by this force at any instant is ______.
