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To cross the river in shortest distance, a swimmer should swim making angle $θ$ with the upstream. What is the ratio of the time taken to swim across in the shortest time to that in swimming across over shortest distance [assume speed of swimmer in still water is greater than the speed of river flow].

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Important Questions on Kinematics

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 37

Raindrops are falling vertically with a velocity of

10 {ms}^{- 1}

. To a cyclist moving on a straight road the raindrops appear to be coming with a velocity of

20 {ms}^{- 1}

. The velocity of cyclist is

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 38

Two identical trains take 3 sec to pass one another when going in the opposite direction but only 2.5 sec if the speed of one is increased by 50% The time one would take to pass the other when going in the same direction at their original speed is:

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 39

For four particles

A, B, C

and

D

the velocities of one with respect to the other are given as

{\vec{V}}_{D C}

20 m s^{- 1}

towards the north,

{\vec{V}}_{B C}

20 m s^{- 1}

towards the east and

{\vec{V}}_{B A}

20 m s^{- 1}

towards the south. Then

{\vec{V}}_{D A}

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 40

A Person

A

observes

B

moving in east direction, with a speed

10 m s^{- 1}, B

observes

C

moving in south direction, with a speed

20 m s^{- 1}, C

observes

D

moving in west direction, with a speed

30 m s^{- 1}

and

D

observes a tree, moving with speed

40 m s^{- 1}

, in the north direction. The actual direction of motion of person

A

will be

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 41

Three elephants $A, B and C$ are moving along a straight line with constant speed in same direction as shown in figure. Speed of and speed of $C$ is $10 {ms}^{- 1}$ . Initially separation between $A & B$ is $d$ and between $B & C is also d$ . When $B$ catches $C$ separation between $A & C becomes 3 d$ . Then the speed of $B$ will be

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 42

A particle

A

is at rest and particle

B

moves in a circle with

A

at it's centre. The particle

A

will appear

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 43

An open elevator is ascending with zero acceleration and speed

10 {ms}^{- 1}

. A ball is thrown vertically up by a boy when he is at a height

10 m

from the ground, the velocity of projection is

30 {ms}^{- 1}

with respect to elevator. Choose incorrect option, assuming height of the boy very small

(g = 10 {ms}^{- 2})

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 44

The block $B$ is moving towards right with constant velocity $v_{0}$ . The velocity of block $A$ with respect to block $B$ is (assume all pulleys and strings are ideal),

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Important Questions on Kinematics

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