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प्रश्न
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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.
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
How much work is done when a body of mass m is raised to a height h above the ground?
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
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.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Name the CGS unit of work.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
