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Laws of Motion ...

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  • Question 1
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    A body of mass 4 kg moving on a horizontal surface with an initial velocity of 6 ms-1 comes to rest after 3 seconds. If one wants to keep the body moving on the same surface with the velocity of 6 ms-1, the force required is

  • Question 2
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    A plumb line is suspended from the roof of a carriage moving with an acceleration a. If plumb line gets inclined at an angle θ with vertical, then

  • Question 3
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    A particle of mass m strikes a wall at an angle of incidence 60o with velocity v elastically. The change in momentum is

  • Question 4
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    A man slides down a light rope whose breaking strength is η times his weight. What should be his maximum acceleration so that the rope just not breaks ?

  • Question 5
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    A ‘NO VACANCY’ board of mass 5 kg is suspended from a horizontal beam by two supporting wires, each at an angle of 450 to the vertical. The tension of each wire is (g = 10 ms-2)

  • Question 6
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  • Question 7
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  • Question 8
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    A spring is compressed between two toy carts of masses m1 and m2. When the toy carts are released, then spring exerts on each, equal and opposite average force for the same time t. Assume that there is no friction between the toy carts and the ground, then the speeds of toy carts are:

  • Question 9
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    A sand bag of mass M is suspended by a rope. A bullet of mass m is fired at it with speed v and gets embeded in it. The loss of K.E. is

  • Question 10
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    A bullet is fired by a light rifle and the other with a heavy rifle by the same force. Which rifle will cause more injury to the shoulder

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