Question

Question 18: The second hand 5 points
of watch is 3 cm long. Find the
change in the velocity of its tip
covering one fourth of the
circumference.
O A 0.628 cm/s
O B 0.245 cm/s
O C 6.46 cm/s
OD 8.56 cm/s​

Answer 1

Answer:

Hey there,

The minute hand covers 360° in 60 seconds,

And 180°=π

So angular speed(ω)=

2π/60 seconds

Since linear speed v=rω

So,

v=3*π/30=π/10 cm/s

According to law of linear vectors--

Δv=√(v²+u²)*cos90°                     [FOR A QUARTER CIRCLE]

But linear velocity is always same, so v=u

Δv=v√2

=π√2/10 cm/s

HOPE IT HELPS!!!

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Explanation: