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प्रश्न
Work done by this force at any instant is ______.
उत्तर
Work done by this force at any instant is zero.
APPEARS IN
संबंधित प्रश्न
Derive a relationship between S.I. and C.C.S. unit of work
The energy of a body is its capacity to do .........
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.
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)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 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.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Can work done be zero even if force acts on the body?
State the energy changes which take place when A toy car with a wound spring moves on ground.
A force can cause an object to change its ______.
Write the two main conditions are needed for work to be done?
