Advertisements
Advertisements
प्रश्न
Name the device or machine which convert :
Electrical energy into sound energy.
Advertisements
उत्तर
A speaker in radio and television converts electrical energy into sound energy.
APPEARS IN
संबंधित प्रश्न
A pendulum is oscillating on either side of its rest position. The correct statement is:
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 compressed spring ____________.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Chemical energy into heat energy.
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
In the case of negative work, the angle between the force and displacement is
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
