## A satellite orbits around the earth due to

A.Celestial force
B.Gravitational force
C.Centrifugal force
D.Centripetal force
E.All of the above

A.3.14 cm/s
B.31.4 cm/s
C.314 cm/s
D.3140 cm/s
E.31400 cm/s

## Our weight will be zero under all of the following conditions EXCEPT

A.When we are ascending in a lift with acceleration of 4.9 m/s2
B.When we are freely faling
C.We are orbiting in a satellite
D.We are at the centre of the earth

## Which one of the following is not the law of dry friction?

A.If friction is neglected, the reactions are always normal to the surfaces on contact
B.Friction always acts to oppose the relative motion of the free body
C.If static friction is acting, the value of the friction force may vary from zero to its maximum value
D.The force of friction is always normal to the surface
E.All of the above

## A stone weighing 20 N is whirling in a vertical circle at the extremity of a string 100 cm long. The tension in the string will be zero

A.at the highest position
B.at the lowest position
C.at the midway position
D.at none of the above

A.0
B.2 N
C.6 N
D.21 N

A.809 rad/min2
B.308/min2
C.502 rad/min2
D.683 rad/min2

A.Involute
B.Cycloid
C.Epicycloid
D.Centrode
E.Straight line

A.520 m/s2
B.640 m/s2
C.780 m/s2
D.870 m/s2

## The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as

A.Nowton’s law
B.Corollary to Newton’s laws of motion
C.Mohr’s principle
D.D’ Alembert’s principle
E.Principle of dynamics