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प्रश्न
Name the device or machine which convert :
Electrical energy into heat energy.
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उत्तर
An electric iron converts electrical energy into heat energy.
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संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
What is the meaning of the symbol kWh? What quantity does it represent?
The device which converts mechanical energy into energy which runs our microwave oven is :
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)
