When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
(A) Mass of a body
(B) Velocity of body
(C) The tension in the string
(D) Centripetal acceleration
The relation between linear and angular acceleration is______________?
(A) a = a x r
(B) a = r x a
(C) a = a x r
(D) r = a x a
If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
(A) At the highest point
(B) At the lowest point
(C) At any point during motion
(D) At the point where gravity is not acting
What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?
(A) 1N
(B) 10N
(C) 2N
(D) 100N
The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is________________?
(A) π
(B) 3π
(C) 6π
(D) 12π
The angular speed of seconds hand of a watch in rads-1 is______________?
(A) π
(B) π/2
(C) π/30
(D) π/180
In an angular motion, Newton’s second law of motion is_____________?
(A) F=ma
(B) F=τp/It
(C) Στ = I α
(D) All above
If a wheel of radius r turns through an angle of 30° then the distance through which any point on its rim moves is______________?
(A) π /3 x r
(B) π/6 x r
(C) V/30 x r
(D) π / 180 x r
A cyclist cycling around a circular racing track skids because_____________?
(A) the centripetal force upon him is less than limiting friction
(B) the centripetal force upon him is greater than limiting friction
(C) the centripetal force upon him is equal to the limiting friction
(D) the friction between the tyres of the cycle and road vanishes
When a wheel 1 m in diameter makes 30 rev min the linear speed of the point on its rim in ms-1 is_______________?
(A) 2π
(B) π/2
(C) π
(D) 20π