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प्रश्न
The energy of a body is its capacity to do .........
उत्तर
The energy of a body is its capacity to do work.
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संबंधित प्रश्न
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
Derive a relationship between S.I. and C.C.S. unit of work
Define 1 joule of energy.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
In case of negative work, the angle between the force and displacement is :
State the conditions of equilibrium for a rigid body.
Is the motion of moon around the earth in circular path an accelerated motion?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Fill in the boxe to show the corresponding energy transformation.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
A ______ should act on an object.
