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प्रश्न
What do you understand by work? Is work a scalar or a vector quantity?
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उत्तर
Work is said to be done when a force displaces a body through some distance, in its own direction, i.e.,
Work = Force × Displacement
W = F × d
Work is a scalar quantity.
संबंधित प्रश्न
How is the unit horsepower related to the S.I. unit of power?
One horse power is equal to ______.
What is the work done when the force on the object and the displacement of the object are perpendicular to each other?
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"]`
How is 1 kgf related to the SI unit of force?
State the condition when the work done by the force is negative.
Derive a relation between the S.I. and C.G.S. unit of force.
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
