Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 29

MEDIUM

NEET

IMPORTANT

Earn 100

If a ball of mass $10 gm$ strikes perpendicular on a hard floor with speed $5 m \sec^{- 1}$ and rebounds with the same speed and remains in contact with the floor for $1 \sec,$ the force applied on the ball by the floor is-

100% studentsanswered this correctly

Important Questions on Laws of Motion

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 5 - Laws of Motion>Exercise-1>Q 30

A super-ball is to bounce elastically back and forth between two rigid walls, at a distance

d

from each other. Neglecting gravity and assuming the velocity of super-ball to be

v_{0}

horizontal, the average force (in large time interval) being exerted by the super-ball on one wall is:

MEDIUM

NEET

IMPORTANT

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

Which of the following relation(s) is/are always correct? [

P =

linear momentum

]

MEDIUM

NEET

IMPORTANT

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:

EASY

NEET

IMPORTANT

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

EASY

NEET

IMPORTANT

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

MEDIUM

NEET

IMPORTANT

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,

HARD

NEET

IMPORTANT

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.

MEDIUM

NEET

IMPORTANT

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,