The resultant of two forces acting at right angles is 34 kg and acting at 60� is

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The resultant of two forces acting at right angles is 34 kg and acting at 60� is 70 kg. The forces are
Options
A. 1 kg and 4 kg
B. 2 kg and 3 kg
C. 3 kg and 5 kg
D. 3 kg and 5 kg
E. 3 kg and 5 kg.

Correct Answer

3 kg and 5 kg.

Applied Mechanics problems

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2. The motion of a particle is described by the relation x = t²- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be
Options
A. zero
B. 30 m
C. 50 m
D. 60 m
E. none of these.

3. The angle of friction is :
Options
A. The ratio of the friction and the normal reaction
B. The force of friction when the body is in motion
C. The angle between the normal reaction and the resultant of normal raction and limiting friction
D. The force of friction at which the body is just about to move.

5. The force acting on a point on the surface of a rigid body may be considered to act
Options
A. at the centre of gravity of the body
B. on the periphery of the body
C. on any point on the line of action of the force
D. at any point on the surface normal to the line of action of the force.

7. For the given values of initial velocity of projection and angle of inclination of the plane, the maximum range for a projectile projected upwards will be obtained, if the angle of projection is
Options
A. ? = -
B. ? = +
C. ? = -
D. ? = -
E. ? = -

9. Newtons's Law of Motion is :
Options
A. Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
C. To every action, there is always an equal and opposite reaction
D. All the above.

10. The height at which the end of a rope of length l should be tied so that a man pulling at the other end may have the greatest tendency to overturn the pillar, is
Options
A. l
B.
C.
D.
E. none of these.

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