A clock is so placed that at 12 noon its minute hand points towards no...
Clearly, the positions of the minute and hour hands at 12 noon and 1.30 p.m. are as shown in the diagram. So, as shown, the hour hand at 1.30 p.m. points towards the east.
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A clock is so placed that at 12 noon its minute hand points towards no...
The direction in which the hour hand of a clock points at 1.30 P.M. can be determined by understanding the movement of the hour hand and the minute hand.
1. Understanding the movement of the hour hand:
- The hour hand completes a full revolution around the clock in 12 hours.
- This means that it moves at a rate of 360 degrees in 12 hours.
- Therefore, the hour hand moves 30 degrees per hour (360 degrees divided by 12 hours).
2. Understanding the movement of the minute hand:
- The minute hand completes a full revolution around the clock in 60 minutes.
- This means that it moves at a rate of 360 degrees in 60 minutes.
- Therefore, the minute hand moves 6 degrees per minute (360 degrees divided by 60 minutes).
3. Analyzing the initial position of the minute hand:
- The question states that at 12 noon, the minute hand points towards north-east.
- North-east is a direction halfway between north and east, which is at an angle of 45 degrees clockwise from north.
- Therefore, at 12 noon, the minute hand is pointing at an angle of 45 degrees clockwise from north.
4. Determining the position of the hour hand at 1.30 P.M.:
- From 12 noon to 1.30 P.M., a total of 1 hour and 30 minutes have passed.
- The hour hand moves at a rate of 30 degrees per hour, so in 1.5 hours, it will move 45 degrees (30 degrees multiplied by 1.5).
- Since the hour hand was initially pointing at 12 noon towards north-east (45 degrees clockwise from north), it will move an additional 45 degrees clockwise.
- Therefore, at 1.30 P.M., the hour hand will be pointing at an angle of 90 degrees clockwise from north.
5. Conclusion:
- At 1.30 P.M., the hour hand points at an angle of 90 degrees clockwise from north, which corresponds to the east direction.
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