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Mechanical Engineering :: Engineering Mechanics

  1. A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

  2. A.

    both the balls undergo an equal change in momentum

    B.

    the change in momentum suffered by rubber ball is more than the lead ball

    C.

    the change in momentum suffered by rubber ball is less than the lead ball

    D.

    none of the above


  3. If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion,

  4. A.

    P + m.a = 0

    B.

    P - m.a = 0

    C.

    P x m.a = 0

    D.

    P/m.a = 0


  5. If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.

  6. A.

    Yes

    B.

    No


  7. The friction experienced by a body, when at rest, is known as

  8. A.

    static friction

    B.

    dynamic friction

    C.

    limiting friction

    D.

    coefficient of friction


  9. The moment of inertia of a solid sphere of mass m and radius r is

  10. A.

    2mr2/3

    B.

    2mr2/5

    C.

    mr2

    D.

    mr2/2