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प्रश्न
Give an example for each of the following uses of a machine:
to change the point of application of force
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उत्तर
A lever is used to change the point of application of force.
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संबंधित प्रश्न
Less force is needed when applied at a farther distance from the pivoted point.
State two factors on which affect moment of force.
What do you mean by the clockwise and anti-clockwise moment of force?
The hand flour grinder is provided with a handle near the rim.
What is thrust?
Find the moment of force of 20 N about an axis of rotation at distance 0.5 m from the force.
The moment of a force of 10 N about a fixed point O is 5 N m. Calculate the distance of the point O from the line of action of the force.
Calculate the length of arm of couple, if a force of 13 N produces a moment of couple of 14.3 Nm.
Assertion & Reasoning
- Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Reason: The principle of conservation of momentum is valid if the external force on the system is zero.
A person standing in front of a cliff fires a gun and hears its echo after 3 s. If the speed of sound in air is 336 ms−1.
- Calculate the distance of the person from the cliff.
- After moving a certain distance from the cliff, he fires the gun again, and this time the echo is heard 1.5 s later than the first. Calculate the distance that the person moved.
