If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is____________________?

Related Mcqs:

1. A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is__________________?

   A. 60 N
   B. 80 N
   C. 100 N
   D. 120 N

2. The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then_________________?

   A. P = R
   B. Q = R
   C. P = Q
   D. None of the above is correct

3. The angles between two forces to make their resultant a minimum and a maximum respectively are__________________?

   A. 0° and 90°
   B. 180° and 90°
   C. 90° and 180°
   D. 180° and 0°

4. When two forces, each equal to P, act at 90° to each other, then the resultant will be_____________?

   A. P
   B. PV2
   C. P/V2
   D. 2P

5. The condition of equilibrium for any system of forces in a plane is____________________?

   A. that polygon of forces must close
   B. that resultant couple must be zero
   C. both (A) and (B)
   D. none of the above

6. If the given forces P,, P2, P3 and P4 are such that the force polygon does not close, then the system will___________________?

   A. be in equilibrium
   B. always reduce to a resultant force
   C. always reduce to a couple
   D. both (A) and (C)

7. The force polygon representing a set of forces in equilibrium is a_____________________?

   A. triangle
   B. open polygon
   C. closed polygon
   D. parallelogram

8. A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is___________________?

   A. 1/3
   B. 2/3
   C. 1/9
   D. 8/9

9. A ladder of weight ‘w’ rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight ‘w’ is to walk to the top of it safely, is tan’1 x, where x is___________________?

   A. 1/4
   B. 1/3
   C. 3
   D. 4

10. If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is__________________?

    A. zero
    B. maximum
    C. minimum
    D. unpredictable