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संबंधित प्रश्न
Define 1 J of work.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
What is the work done by the moon when it revolves around the earth?
The moon is revolving around the earth in a circular path. How much work is done by the moon?
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
State two disadvantages of producing hydroelectricity.
What do you mean by degradation of energy?
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Its moment of a force scalar or a vector quantity?
Explain the difference between a uniform linear motion and a uniform circular motion.
Define 'joule'.
What is the ratio of SI units to CGS units of 'work'?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
