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Write an expression for the work done when a force is acting on an object in the direction of its displacement.
The moon is revolving around the earth in a circular path. How much work is done by the moon?
Explain by an example that a body may possess energy even when it is not in motion.
Can every force produce work?
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?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
