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प्रश्न
What kind of energy is possessed by the following?
A compressed spring ____________.
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उत्तर
A compressed spring possesses elastic potential energy.
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संबंधित प्रश्न
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
When an object falls freely towards the earth, then its total energy :
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
