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Calculate the worked done in lifting a 300N weight to a height of 10m with an accelertaion `0.5ms^(2)`. Take g=`10ms^(-2)`.

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500 J of work is done in lifting a 30 kg weight to a height of 0.5 m . With what acceleration the weight was raised ?

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Knowledge Check

  • A crane lifts a mass of 100 kg to a height of 10m in 20s . The power of the crane is (Take g = 10 ms^(-2))

    A
    `100 W`
    B
    `200 W`
    C
    `250 W`
    D
    `500 W`

  • An object of mass 5 kg is attached to the hook of a spring balance and the balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is going up with an acceleration of 0.25 ms^(-2) is take, (take, g=10ms^(-2) )

    A
    51.25 N
    B
    48.75 N
    C
    52.75 N
    D
    47.25 N

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    The work done by a boy in lifting his bag up to a height of 2m is 200 J. Find the mass of his bag (Take g = 10 ms^(-2) ).

    Calculate the work done in lifting 200 kg of water through a vertical height of 6 meters (Assume g = 10 m//s^(2) ).

    Find the work done to move an object of mass 3 kg to a height of 20 m from the ground (Take g = 10 ms^(-2) ).

    A 75 kg man stands in a lift. What force does the floor does the floor exert on him when the elevator starts moving upwards with an acceleration of 2.0ms^(-2) . ? Take g = 10 ms^(-2) .

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    A heat engine of efficiency 40% takes 10kJ of heat energy per second. Find the time required by this engine to lift a weight of 1000kg to a height of 10m from the ground. (Take g= 10ms^(-2) )

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