Question

A clock contain hour’s hand of length 14 cm. Calculate the displacement produced by the tip of thehand in the time of 9 hours is​

Answer 1

Given:

The length of the lour hand is 14 cm.

To find:

Displacement of the hour hand in 9 hours.

Solution:

1) The length of the hour hand would be the radius of the circular path covered by the hand of the clock.

2) Hand covers the time of 9 hours so it will cover 3/4 of the total distance.

3) So the displacement will be

• 3/4(2πr)

• 3/2×πr

• 3/2×22/7×14

• 66 cm.

Displacement of the hour hand in 9 hours is 66 cm.