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NDA - Work Energy & Power Test 1431
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NDA - Work Energy & Power Test 1431
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  • Question 1/5
    1 / -0.33
    How far must a 2N force pull a 20g toy car if 10J of energy are transferred?
    Solutions

    Given,

    Workdone= 10J

    Force= 2

    Distance=?

    Use the formula

    Workdone=

    d=  =

    so, distance= 5m

  • Question 2/5
    1 / -0.33
    If a 2 kg meteorite strikes Saturn at 15km/s, then how much kinetic energy can be observed?
    Solutions
    Mass, m = 2kg

    Velocity, v= 15km/s

    Kinetic energy, KE=

    =

    = 225000000 J

    = 225 MJ

  • Question 3/5
    1 / -0.33
    If a body moves in a circular path, then what will be its workdone?
    Solutions

    Zero, because force and displacement are perpendicular to each other. In a circular path, the work done on a body is also zero. This is due to the centripetal force that acts along the radius of the circle, and it is at right angles to the motion of the body. Hence, the work done of moon moving round the earth is also zero.

  • Question 4/5
    1 / -0.33
    If the velocity of a body is doubled then what will be its kinetic energy
    Solutions

    If the velocity of a body is doubled then its kinetic energy will be multiplied by four times. There is no relationship between the velocity and potential energy of the body. Hence it is proved that if the velocity of a body is doubled, momentum also doubles.

  • Question 5/5
    1 / -0.33
    Rubbing of hands produces a sensation of warmth because
    Solutions

    When we rub our hands against each other, it causes the molecules in our skin to move a little faster. The faster that molecules move, the higher the amount of heat produced. So, the friction force produced by rubbing our hands together makes them feel warmer.

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