Physics
Rotational and Circular Motion
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#153 Angular speed of earth about its axis
A) \(\pi 432 \times 10^{-2}\)
B) \(\pi 18 \times 10^{-2}\)
C) 7.3 \(\times 10^{-5}\)
D) Both A and C
#154 Three particles of a rigid body rotating about a fixed axis are located at 5 cm, 10 cm and 15 cm from axis of rotation. Which particle has greater tangential velocity?
A) 5 cm
B) 10 cm
C) 15 cm
D) All have same tangential speed
#155 The linear velocity of a person standing at the equator of the earth.
A) 465.4 m/s
B) 4.654 m/s
C) 46.54 m/s
D) Zero
#156 The ratio of angular speed of minutes\' hand and hours hand of a watch is
A) 1:12
B) 12:1
C) 60:1
D) 1:60
#157 A rotating wheel of radius 0.5 m has an angular velocity of 5 rad/sec at some instant and 10 rad/sec after 5 s. Its angular acceleration is
A) 2 rad/sec²
B) 1 rad/sec²
C) 0.5 rad/sec²
D) 4 rad/sec²
#158 A ball of radius 5 cm rolls down an inclined plane from rest. After 4.0 s, its angular velocity is 8 rad/sec. Its angular acceleration and linear acceleration are respectively
A) 2 rad/sec², 1 m/s²
B) 0.2 rad/sec², 0.1 m/s²
C) Zero, 0.1 m/s²
D) 2 rad/sec², 0.1 m/s²
#159 The direction of angular velocity is along
A) Tangent to the circle
B) Inward radius
C) Outward radius
D) The axis of rotation
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