Advertisements
Advertisements
प्रश्न
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
Advertisements
उत्तर
The compressed spring has elastic potential energy due to its compressed state. When it is released, the potential energy of the spring changes into kinetic energy which does work on the ball if placed on it and changes into kinetic energy of the ball due to which it flies away.
APPEARS IN
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?
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
What kind of energy is possessed by the following?
A stretched rubber band _____________
Name the device or machine which convert :
Electrical energy into light energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
