Advertisements
Advertisements
प्रश्न
Work done by a force is equal to the product of ....... and ....
उत्तर
Applied force, displacement in the direction of the applied force.
APPEARS IN
संबंधित प्रश्न
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
kWh is the unit of ______.
Name the quality which is measured in kW.
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
A pump is used to lift 600 kg of water from a depth of 75 m in 10s. Calculate:
- The work done by the pump,
- the power at which the pump works, and
- The power rating of the pump if its efficiency is 40%. (Take g = 10m s-2).
`["Hint" : "Efficiency" = "useful power"/"power input"]`
Define one newton. Write the relation between the S. I. unit and the C.G.S. unit of force.
What do you understand by work? Is work a scalar or a vector quantity?
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)