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  • Question

  • A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is


  • Options
  • A. v
  • B. 2v
  • C. 4v
  • D. 8v

  • Correct Answer
  • 2v 

    • Engineering Mechanics problems

    Search Results

    • 1. A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 2. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

    • Options
    • A. area of the triangle
    • B. twice the area of the triangle
    • C. half the area of the triangle
    • D. none of these
      • Discuss
    • 3. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)

    • Options
    • A. n
    • B. n2
    • C. 2n
    • D. 2n - 1
      • Discuss
    • 4. The velocity ratio for the third system of pulleys is

    • Options
    • A. n
    • B. n2
    • C. 2n
    • D. 2n - 1
      • Discuss
    • 5. The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is

    • Options
    • A. 2mr2/3
    • B. 2mr2/5
    • C. 7mr2/3
    • D. 7mr2/5
      • Discuss
    • 6. Vectors method for the resultant force is also called polygon law of forces.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 7. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

    • Options
    • A. first
    • B. second
    • C. third
      • Discuss
    • 8. Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 9. The centre of gravity of a triangle lies at a point where its medians intersect each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. One joule means that

    • Options
    • A. work is done by a force of 1 N when it displaces a body through 1m
    • B. work is done by a force of 1 kg when it displaces a body through 1 m
    • C. work is done by a force of 1 dyne when it displaces a body through 1 cm
    • D. work is done by a force of 1 g when it displaces a body through 1 cm
      • Discuss

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