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State the S.I. unit of moment of force.

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प्रश्न

State the S.I. unit of moment of force.

एक पंक्ति में उत्तर
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उत्तर

S.I. units : N m (Newton meter)

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अध्याय 1: Force, Work, Energy and Power - Exercise 1.1 i [पृष्ठ १३]

APPEARS IN

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संबंधित प्रश्न

A brass ball is hanging from a stiff cotton thread. Draw a neat labeled diagram showing the forces acting on the brass ball and cotton thread


Less force is needed when applied at a farther distance from the pivoted point.


In a door, handle is provided  ......... from the hinges.


State two factors on which affect moment of force.


Classify the following amongst contact and non-contact force.

force of tension in a string


State the condition when the change in the momentum of a body depends only on the change in its velocity.


State Newton's third law of motion.


Is moment of force a scalar or a vector?


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.


A wheel of diameter 2 m is shown in the figure with the axle at O. A force F = 2 N is applied at B in the direction shown in the figure. Calculate the moment of force about

  1. the centre O, and
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Explain the motion of a planet around the sun in a circular path.


Fig. 5 shows a uniform meter scale weighing 200 gf. Provided at its centre. Two weights 300 gf and 500 gf are suspended from the ruler as shown in the diagram. Calculate the resultant torque of the ruler and hence calculate the distance from mid-point where a 100 gf should be suspended to balance the meter scale.


(i) What do you understand by the term couple of forces?
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The S.I. unit of moment of force is ______.


State the effects that a force can produce. Given one example of each.


A couple of 15 N force acts on a rigid body, such that arm of couple is 85 cm. Calculate moment of couple in the SI system.


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Assertion & Reasoning

  1. Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
  2. Reason: The principle of conservation of momentum is valid if the external force on the system is zero.

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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.

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  2. 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.

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