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प्रश्न
Name the energy transfers which occur when an electric ball rings.
Name the energy conversion that takes place when an electric bell rings.
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उत्तर
An electric bell converts electrical energy to sound energy.
संबंधित प्रश्न
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
State the condition under which the mechanical energy is conserved.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What kind of energy is possessed by the following?
A running car ____________
What kind of energy is possessed by the following?
A stretched rubber band _____________
Fill in the blank with suitable word :
The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
What type of energy is possessed : by the stretched rubber strings of a catapult?
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Define the term 'energy' of a body. What is the SI unit of energy.
Water stored in a dam possesses ______.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
Which one of the following is not the unit of energy?
The device which converts mechanical energy into energy which runs our microwave oven 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)
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
