Question

The linear speed of the second hand of a wall clock is 1.05 cm/s. What will be the length of of the seconds hand?

Answer 1

linear speed = 1.05 cm/s

thus, in 1 second, it goes 1.05cm
in 1 second, it covers (630/60) = 6 degrees

$\frac{6}{360} \times 2 \pi \times l = 1.05\\\\ \Rightarrow l = \frac{1.05 \times 360}{6 \times 2 \pi } \\\\ \Rightarrow l = 10.03\ cm$

Length of seconds hand is 10.03cm

Answer 2

Answer:

here is your answer mate...

Explanation:

in 60 sec the linear distance would be 60*1.05 = 63 cm.  

which is equal to circumference of the circle = 2*Pi*R = 63

R = 63/(2*pi) = 10.03 cm which is the length of the seconds hand.

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