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Laws of Motion Test - 2

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Laws of Motion Test - 2
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  • Question 1
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    A cubical block of mass 'm' rests on a rough horizontal surface. μ is the coefficient of static friction between the block and the surface. A force mg, acting on the cube at an angle θ with the vertical side of the cube, pulls the block. If the block is to be pulled along the surface, then the value cot(θ/2) is 

  • Question 2
    1 / -0

    A stone of mass m tied to a string of length l is rotating along circular path with constant speed v. The torque on the stone is 

  • Question 3
    1 / -0

    According to Newton's second law of motion, force is equal to

  • Question 4
    1 / -0

    A stone of mass 200 g is tied to the end of a 1 m long string. Holding the string at the other end, it is whirled in horizontal circles. If the speed of the stone is 10 m/s, calculate the centripetal force.

  • Question 5
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    The maximum and minimum tension in the string whirling in a circle of radius 2.5 m with constant velocity are in the ratio 5 : 3 then its velocity is (g = 9.8 m/s2)

  • Question 6
    1 / -0

    Inertia refers to

    Solution

    Inertia is the resistance of any physical object to any change in its state of motion; this includes changes to its speed, direction, or state of rest. It is the tendency of objects to keep moving in a straight line at constant velocity. Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

     

  • Question 7
    1 / -0

    A force acts for 10 s on a body of mass 100 kg, after which the force ceases to act and the body describes 160 m in the next 8 s. What is the magnitude of the force?

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