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State the Principle of Moments. - Physics

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प्रश्न

State the principle of moments.

एक पंक्ति में उत्तर

उत्तर

Principle of moments: If a body is in equilibrium under the action of number of force, then the sum of clockwise moments is equal to the sum of anticlockwise moments.

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Work Done by the Force of Gravity (W = mgh)
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Force, Work, Energy and Power - Exercise 1.1 i [पृष्ठ १३]

APPEARS IN

फ्रैंक Physics - Part 2 [English] Class 10 ICSE
अध्याय 1 Force, Work, Energy and Power
Exercise 1.1 i | Q 15 | पृष्ठ १३

संबंधित प्रश्न

A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:

  1. The work done by them.
  2. The power developed by them.

A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions

1) Is the stone moving with a uniform or variable speed?

2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?

3) What kind of force acts on the hand and state its direction?


An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.


A bus and a car have the same K.E. which of the two should be moving faster? Explain.

A pump is used to lift 600 kg of water from a depth of 75 m in 10s. Calculate:

  1. The work done by the pump,
  2. the power at which the pump works, and
  3. The power rating of the pump if its efficiency is 40%. (Take g = 10m s-2).

`["Hint" : "Efficiency" = "useful power"/"power input"]`


A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.


Give the units of couple.


State the condition when the work done by the force is negative.


A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)


For the following scenarios, state whether the work done by gravity is positive, negative, or zero.

A person climbs a ladder.


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