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Work, Energy an...

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  • Question 1
    1 / -0

    The work done in pulling up a block of wood weighing 2 kN for a length of 10 m on a smooth plane inclined at an angle of 15° with the horizontal is ________. (sin 15° = 0.2588)

  • Question 2
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    A crane is used to lift 10000 kg of coal from a mine 100 m deep. If the time taken to lift coal by the crane is 1 hour, then what is the power of the driving mechanism of the crane?
    (Efficiency of the crane is 80%, g = 9.8 m/s2)

  • Question 3
    1 / -0

    The scalar product of two vectors A and B in terms of the magnitudes and angle θ is

  • Question 4
    1 / -0

    The scalar product of two vectors A and B is

  • Question 5
    1 / -0

    A 1 kg ball moving at 12 m/s collides head-on with a 2 kg ball moving in the opposite direction at 24 m/s. What is the velocity of each ball after the impact if the coefficient of restitution is 2/3 ?

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