First slide

Angular velocity, Angular acceleration

Question

Identify the increasing order of angular velocities of following
a) Earth rotating about its own axis
b) Hour’s hand of clock
c) Seconds hand of clock
d) Fly wheel of radius 2m making 300 r.p.m.

Moderate

A

a, b, c, d
B

b, c, d, a
C

c, d, a, b
D

d, a, b, c

Solution

For the earth ,
$\large \omega = \frac{2\pi}{24X60X60}rad/sec$
For hour's hand ,
$\large \omega = \frac{2\pi}{12X60X60}rad/sec$
For seconds hand ,
$\large \omega = \frac{2\pi}{60}rad/sec$
For fly wheel ,
$\large \omega = \frac{2\pi X 300}{60}= 10\pi rad/sec$

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