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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 98

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A man of mass $m_{1}$ holding one end of a massless, inextensible string that passes over the smooth pulley, is accelerating up while standing on a platform of mass $m_{2}$ . If the pulley moves up with an upward acceleration $a$ , the pressing force offered by the man on the platform is

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Important Questions on Laws of Motion

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 99

A body

P

of mass

m_{p}

makes a perfectly elastic collision with another body

Q

of mass

m_{Q}

at rest. If they fly apart in opposite directions with equal speed then the ratio of their masses is-

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 100

A body of weight

W_{1}

is suspended from the ceiling of a room through a chain of weight

W_{2} .

The ceiling pulls the chain by a force

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 101

A string of negligible mass going over a clamped pulley of mass supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 102

Consider the system, as shown in the figure. The pulley and the string are light, and all the surfaces are frictionless. The tension in the string is $(g = 10 m s^{- 2})$

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 103

An elevator is moving downward with an acceleration

\frac{2 m}{s^{2}}

. A ball of mass

100 g m

is attached at one end of the string and the other end is fixed to the ceiling of the lift. The ball remains at rest relative to lift. The tension in the string is: