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प्रश्न
Name the device or machine which convert :
Electrical energy into sound energy.
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उत्तर
A speaker in radio and television converts electrical energy into sound energy.
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संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
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 type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
What is the difference between potential energy and kinetic energy?
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
What kind of energy transformation take place at a hydroelectric power station?
How much energy does a 100 W electric bulb transfer in 1 minute?
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.
