Where will the hand of clock stop if starts at 12 and makes 1/4 of revolution anticlockwise?

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Answer :

(a) Starting from 12 and making 1/2 of a revolution, In one revolution = 12 hour \(\therefore \) 1/2 revolution =( 1/2 ) × 12 = 6 hour Then 12 + 6 I.e., 0 + 6 = 6 the clock hand stops at 6. (b) Starting from 2 and making 1/2 of a revolution, In one revolution = 12 hour \(\therefore \) 1/2 revolution =( 1/2 ) × 12 = 6 hour Then 2 + 6 = 8 the clock hand stops at 8. (c) Starting from 5 and making 1/4 of a revolution, In one revolution = 12 hour \(\therefore \) 1/4 revolution =( 1/4 ) × 12 = 3 hour Then 5 + 3 = 8 the clock hand stops at 8. (d) Starting from 12 and making 3/4 of a revolution, In one revolution = 12 hour \(\therefore \) 3/4 revolution =( 3/4 ) × 12 = 9 hour Then 5 + 9 = 14 = 12 + 2 I.e., 0 +2 = 2 the clock hand stops at 2.

1 complete revolution or full rotation, means a complete turn so it points back the same way.

Answer: a) The clock hand will stop at 6, b) The clock hand will stop at 8, c) The clock hand will stop at 8, d) The clock hand will stop at 2

Let's understand the concept of turning clockwise and anti-clockwise.

Explanation:

In one complete revolution, the clock hand moves 360° or 12 hours.

⇒ 1 revolution = 12 hours 

Using the unitary method, we have 

1/2 of a revolution = 12/2 = 6 hours

1/4 of a revolution = 12/4 = 3 hours

3/4 of a revolution = 3 × 12/4 = 9 hours

A) If the clock hand starts at 12 and makes 1/2 of a revolution, it would stop after 6 hours, that is, at 6 o'clock.

B) If the clock hand starts at 2 and makes 1/2 of a revolution, it would stop after 6 hours, that is, at 8 o'clock.

C) If the clock hand starts at 5 and makes 1/4 of a revolution, it would stop after 3 hours, that is, at 8 o'clock.

D) If the clock hand starts at 5 and makes 3/4 of a revolution, it would stop after 9 hours, that is, at 2 o'clock.

Therefore, a) The clock hand will stop at 6, b) The clock hand will stop at 8, c) The clock hand will stop at 8, d) The clock hand will stop at 2

Last updated at Nov. 12, 2021 by

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Last updated at Nov. 12, 2021 by Teachoo

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Next: Ex 5.2, 2 (c) Important →

Ex 5.2, 2 Where will the hand of a clock stop if it (b) starts at 2 and makes (1 )/2 of a revolution, clockwise? 1 revolution = 12 hours 1/2 revolution = 6 hours So, clock will move 6 hours & stop at 8.

Question 9 Exercise 5.2

Next

Answer:

We know that one complete clockwise revolution, hour hand will rotate by 3600

(a) When hour hand of a clock starts at 12 and makes 1 / 2 revolution clockwise, it will rotate by 180°.

Hence, the hour hand of a clock will stop at 6.

(b) When hour hand of a clock starts at 2 and makes 1 / 2 revolution clockwise, it will rotate by 180°

Hence, the hour hand of a clock will stop at 8.

(c) When hour hand of a clock starts at 5 and makes 1 / 4 revolution clockwise, it will rotate by 90°

Hence, hour hand of a clock will stop at 8.

(d) When hour hand of a clock starts at 5 and makes 3 / 4 revolution clockwise, it will rotate by 2700

Hence, hour hand of a clock will stop at 2

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