Question

The minute hand of a watch is 1.5cm long. How far does its tip move in 10 minutes?​

Answer 1

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The minute hand of a watch is 1.5 cm along. How far does its tip move in 40 minutes

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Solution

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We know that l=rθ

Hence r=1.5cm

Now we know that minute hand make 1- a revolution in 1-hour

Hence we can say

minute hand completes 360

∘

in one hour

So degree complete in

1min=

60

360

​

So degree complete in

40min=

60

360

​

×40

=240

∘

Hence θ=240

∘

Radian measure =

180

π

​

×θ

=

180

π

​

×240

=4π/3

Now l=rθ

l=1.5×4π/3

l=0.5×4π

=2π

=2×3.14

l=6.28cm

Step-by-step explanation:

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