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प्रश्न
State four ways in which machines are useful to us.
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उत्तर
Machines are useful to us in the following ways:
- In lifting a heavy load by applying less effort.
- In changing the point of application of effort to a convenient point.
- In changing the direction of effort in a convenient direction.
- For obtaining a gain in speed.
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संबंधित प्रश्न
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Complete the following sentence :
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