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  • Question

  • A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be


  • Options
  • A. 0.5 m/sec
  • B. 1.5 m/sec
  • C. 2.5 m/sec
  • D. 3.5 m/sec
  • E. 4.5 m/sec.

  • Correct Answer
  • 2.5 m/sec 

    • Applied Mechanics problems

    Search Results

    • 1. If ? and u are the angle of projection and initial velocity of a projectile respectively, the horizontal range of the projectile, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. Power can be expressed as

    • Options
    • A. work/energy
    • B. work/time
    • C. work x time
    • D. work/distance.
      • Discuss
    • 3. Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

    • Options
    • A. 5 Newtons
    • B. 8 Newtons
    • C. 10 Newtons
    • D. 12 Newtons.
      • Discuss
    • 4. A body is said to move with Simple Harmonic Motion if its acceleration, is

    • Options
    • A. always directed away from the centre, the point of reference
    • B. proportional to the square of the distance from the point of reference
    • C. proportional to the distance from the point of reference and directed towards it
    • D. inversely proportion to the distance from the point of reference
    • E. none of these.
      • Discuss
    • 5. If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called

    • Options
    • A. virtual work
    • B. imaginary work
    • C. zero work
    • D. negative work.
      • Discuss
    • 6. M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

    • Options
    • A. (D4 + d4)
    • B. (D4 - d4)
    • C. (D4 + d4)
    • D. (D4 x d4).
      • Discuss
    • 7. Pick up the correct statement from the following for the structure shown in below figure.

    • Options
    • A. The horizontal reaction at A is 23t ?
    • B. The horizontal reaction at C is 23t ?
    • C. The vertical reaction at A is zero
    • D. The vertical reaction at C is 2 t ?
    • E. All the above.
      • Discuss
    • 8. The ratio of the reactions RA and RB of a simply supported beam shown in below figure is

    • Options
    • A. 0.50
    • B. 0.40
    • C. 0.67
    • D. 1.00
    • E. 1.50
      • Discuss
    • 9. A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately

    • Options
    • A. 400 watts
    • B. 500 watts
    • C. 4000 watts
    • D. none of these.
      • Discuss
    • 10. The following statement is one of the laws of Dynamic friction

    • Options
    • A. The force of friction always acts in a direction opposite to that in which a body is moving
    • B. The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
    • C. For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
    • D. all the above.
      • Discuss

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