Question

a clock contains hours hand of length 14cm .calculate the displacement produced by the tip of the hand in 9 hours ..
answer is 14root2 I need solution plz answer quickly plz...​

Answer 1

Explanation:

Minute hand completes full circle degree in 60 minutes.

Angle swept by minute in 60 minutes =360°

Angle swept by the minute hand in 15 minutes =

60

360°

×15=90°

Therefore,

θ=90°

Length of minute hand =r=14cm

Area swept by minute hand in 15 minutes = Area of sector

As we know that area of sector is given as-

A=

360°

θ

×πr

2

Therefor,

Area swept by the minute hand in 15 minutes =

360°

90°

×(

7

22

×(14)

2

)=

4

1

×616=154cm

Hence the area swept by the minute hand in 15 minutes is 154cm

2

.

Hence the correct answer is 154cm

2

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Answer 2

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