Question

The minute hand of a wall clock is 10cm long. Find its displacement when it

moves from 10:00am to 10:30am.

(i) 10cm

(ii) 20cm

(iii) 20π cm

(iv) 10π cm​

Answer 1

Answer:

From 10 am to 10.30 am minute hand rotates 180° from 0 minute to 30 minutes. Hence distance covered is half the circle means semi circle. Hence Distance is 31.4 cm & Displacement is 20 cm.

Explanation:

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Answer 2

Answer:

(iv) 10π cm

Explanation:

circumference of the clock 2πr

minute hand makes 180 angle when moves 10:00 am to 10:30am

therefore

2πr/2

2π10/2

20π/2

10π