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प्रश्न
Power spent by a body depends on the time for which it does work.
पर्याय
True
False
उत्तर
True.
APPEARS IN
संबंधित प्रश्न
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
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?
Each of the following statement describes a force acting. Which force is causing work to be done?
The work done on an object does not depend on ______.
What is the work done when the object acted upon by a force remains at rest?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
Give an example
Chemical energy changes to electrical energy.
Define force. Is force a scalar or a vector quantity?
What should be the characteristic of a source of energy?
(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?
Write the two main conditions are needed for work to be done?
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
