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प्रश्न
Give an example
Electrical energy changes to heat energy.
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उत्तर
Electric iron
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Write an expression for the work done against gravity.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
