Question

The second's hand of a clock is 5 CM long. The speed of the tip of this hand is

Answer 1

The speed of seconds hand during a complete revolution is given by v=r(omega)

Omega=2π/T

Now v=2πr/T

take r=5cm=0.05m

T=60s.since during a complete revolutionT=60s.plug in the values and get the answer.

Answer 2

Answer:

The speed is $0.52$ cm/s.

Explanation:

Since the second hand of a clock is $5$ cm.

⇒ radius of clock, r = $5$ cm

Circumference of clock = $2\pi r$

                                       = $2$ × $\frac{22}{7}$ × $5$

                                       = $\frac{220}{7}$ cm

Distance travel in $60$ seconds = circumference of clock

                                                 = $\frac{220}{7}$ cm

Speed of the tip of hand = Distance/Time

                                         = $\frac{220/7}{60}$

                                         = $\frac{220}{7(60)}$

                                         = $\frac{22}{42}$

                                         = $0.52$ cm/s.

Therefore, the speed of the tip of hand is $0.52$ cm/s.

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