Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 31

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Which of the following relation(s) is/are always correct? [ $P =$ $linear momentum$ ]

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Important Questions on Laws of Motion

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 32

With the force on a rocket which is ejecting gases with a relative velocity of

300 m s^{- 1}

is

210 N .

Then the rate of combustion of the fuel will be:

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 33

A belt is moving horizontally with a speed of

2 m s^{- 1}

and sand is falling on it at the rate of

150 g s^{- 1} .

The additional force require to keep constant the speed of belt is

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 34

A rocket with a lift-off mass

3.5 \times 1 0^{4} kg

is blasted upwards with an initial acceleration of

10 {m s}^{- 2}

. Then the initial thrust of the blast is

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 35

Fuel is consumed at the rate of

100 kg s^{- 1}

in a rocket. The exhaust gases are ejected as a speed of

4.5 \times 10^{4} m s^{- 1} .

What is the thrust experience by the rocket,

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 36

A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given. The upper half of an inclined plane with inclination

ϕ

is perfectly smooth while the lower half is rough.

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 37

A box

A

is lying on the horizontal floor of the compartment of a train running along horizontal rails from left to right. At time

t

, it decelerates. Then the reaction

R

by the floor on the box is given best by,

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Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 38

The blocks $A$ and $B$ are arranged as shown in the figure. The pulley is frictionless. The mass of $A$ is $10 kg$ . The coefficient of friction between the block $A$ and horizontal surface is $0.20$ . The minimum mass of $B$ to start the motion will be