Physics
Rotational and Circular Motion
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#169 A couple produces
A) Purely linear motion
B) Purely rotational motion
C) Linear and rotational motion
D) No motion
#170 A body of mass 5 kg is moving in a circle of radius 1 m with angular speed of 2 rad/sec. The centripetal force is
A) 40 N
B) 30 N
C) 10 N
D) 20 N
#171 A stone attached to a string is being whirled in a vertical circle. The string is likely to break when the stone is at
A) Lowest position
B) Highest position
C) Any point
D) At middle
#172 Work done by centripetal force in half revolution is
A) \(2mv^2 r\)
B) \(mv^2 2r\)
C) Zero
D) \(2mv^2 3r\)
#173 A cyclist bends while taking a turn to
A) Reduce reaction
B) Reduce speed
C) Provide centripetal force
D) Reduce friction
#174 In uniform circular motion, which of the following does not remain constant?
A) Speed
B) Angular momentum
C) K.E
D) Momentum
#175 If a fan is switched ON, then its angular acceleration and angular velocity are
A) Parallel
B) Antiparallel
C) Perpendicular
D) Inclined at an angle less than 90°
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