Question

The length of a second’s hand of a clock is 4cm. The speed of tip of the second’s hand is :

(A) 0.24 cm/s (B) 0.32 cm/s (C) 0.42 cm/s (D) 0.50 cm/s​

Answer 1

Answer:

r=4cm t=60sec w=?

w=2π/t=2×3.14/60=0.104

w=0.104

so v=rw=4×0.104=0.42cm/s

this is your answer = 0.42

Answer 2

Answer:

0.42cm/s

Explanation:

time period of second's hand of a clock=60 s

radius (r) =4cm

v=rw

=r*2*22/7*1/60

=4*2*22/7*1/60

=0.419

=0.42 cm/s

=