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प्रश्न
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
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उत्तर
Chemical energy (chemical reaction) → Heat energy (burning)
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संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Define the term energy.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
A force can cause an object to change its ______.
