Question Details

The ratio of angular velocity of rotation of minute hand of a clock with the angular velocity of rotation of the earth about its own axis is

Options

A

12

B

6

C

24

D

None of these

Correct Answer :

24

Solution :

The correct option is 24.

To find the ratio of the angular velocity of the minute hand of a clock to the angular velocity of the Earth's rotation, we can start by using the definition of angular velocity.

Angular velocity (ω) is given by the formula:

ω=2πT

where T is the time period of one complete rotation.

First, let us determine the time period for the minute hand of a clock (Tminute). The minute hand completes one full rotation of 360 degrees (or 2π radians) in 1 hour.

Tminute=1 hour

Therefore, the angular velocity of the minute hand (ωminute) is:

ωminute=2π1 hour

Next, let us determine the time period for the Earth's rotation about its own axis (TEarth). The Earth completes one full rotation about its axis in 24 hours.

TEarth=24 hours

Therefore, the angular velocity of the Earth (ωEarth) is:

ωEarth=2π24 hours

Now, we find the ratio of the angular velocity of the minute hand to the angular velocity of the Earth:

Ratio=ωminuteωEarth=2π1 hour2π24 hours

Simplifying this fraction by canceling the common 2π term in both the numerator and the denominator, we get:

Ratio=24 hours1 hour=24

Thus, the ratio of the angular velocity of the minute hand of a clock to the angular velocity of rotation of the Earth about its own axis is 24.

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