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  • Question

  • The Law of Polygon of Forces states that


  • Options
  • A. if a polygen representing the forces acting at point in a body is closed, the forces are in equilibrium
  • B. if forces acting on a point can be represented in magnitde and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon
  • C. if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order
  • D. if forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium.

  • Correct Answer
  • if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order 

    • Applied Mechanics problems

    Search Results

    • 1. The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called

    • Options
    • A. angle of repose
    • B. angle of friction
    • C. angle of inclination
    • D. none of these.
      • Discuss
    • 2. The tension in a cable supporting a lift

    • Options
    • A. is more when the lift is moving downwards
    • B. is less when the lift is moving upwards
    • C. remains constant whether its moves downwards or upwards
    • D. is less when the lift is moving downwards.
      • Discuss
    • 3. To attain the synchronous orbit, the launch of a satellite, is done from a place

    • Options
    • A. on equator
    • B. on 30° latitude
    • C. on 45° latitude
    • D. on 60° latitude
    • E. on the poles.
      • Discuss
    • 4. Engineer's units of force, is

    • Options
    • A. Newton in absolute units
    • B. Dyne in absolute units
    • C. Newton and dyne in absolute units
    • D. All the above.
      • Discuss
    • 5. Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

    • Options
    • A. its longer side"
    • B. its shorter side"
    • C. the diagonal of the parallelogram which does not pass through the point of intersection of the forces"
    • D. the diagonal of the parallelogram which passes through the point of intersection of the forces"
    • E. half the sum of the diagonals".
      • Discuss
    • 6. If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will be

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • E. 5.
      • Discuss
    • 7. The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is , the velocities of separation of the balls will be equal to

    • Options
    • A. original velocity in the same direction
    • B. half the original velocity in the same direction
    • C. half the original velocity in the opposite direction
    • D. original velocity in the opposite direction
      • Discuss
    • 8. A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is :

    • Options
    • A. 40 g
    • B. 60 g
    • C. 80 g
    • D. 100 g.
      • Discuss
    • 9. The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is

    • Options
    • A. 188.5 m/sec
    • B. 18.85 m/sec
    • C. 1.885 m/sec
    • D. 0.18845 m/sec.
      • Discuss
    • 10. The reaction at the support A of the beam shown in below figure is

    • Options
    • A. 2 t
    • B. 5.8 t
    • C. 0.2 t
    • D. 3.5 t.
      • Discuss

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