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प्रश्न
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
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उत्तर
When a cricket player catches a ball, he exerts force against the direction of the ball, which results in negative work.
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संबंधित प्रश्न
State and define the S.I. unit of work.
Differentiate between work and power.
State the factors on which moment of force about a point depends.
What do you understand by the clockwise and anti clockwise moment of force?
What is the work done when the force on the object and the displacement of the object are perpendicular to each other?
State the condition when the work done by a force is negative. Explain with the help of examples.
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"]`
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
What do you understand by work? Is work a scalar or a vector quantity?
What is the S.I. unit of work? Define it.
