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A shell is fired from a cannon with velocity $v m s^{- 1}$ at an angle $θ$ with the horizontal direction. At the highest point in its path, it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in $m s^{- 1}$ of the piece immediately after the explosion is

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Important Questions on Physics

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A shell is fired from a fixed artillery gun with an initial speed

u

such that it hits the target on the ground at a distance

R

from it. If

t_{1}

and

t_{2}

are the values of the time taken by it to hit the target in two possible ways, the product

t_{1} t_{2}

is:

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A projectile is fired from the surface of the earth with a velocity of

5 m s^{- 1}

and angle

θ

with the horizontal. Another projectile fired from another planet with a velocity of

3 {m s}^{- 1}

at the same angle follows a trajectory which is identical with the trajectory of the projectile fired from the earth. The value of the acceleration due to gravity on the planet is: (given

= 9.8 m s^{- 2}

)

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two particles are projected from the same point with the same speed u such that they have the same range R, but different maximum heights,

h_{1}

and

h_{2} .

Which of the following is correct?

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

At what angle

θ

to the horizontal should an object is projected so that the maximum height reached is equal to the horizontal range?

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Which of the following graphs represents the speed

v

of a vertical projectile as a function of time

t

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two projectiles

P

and

Q

thrown with velocities

v

and

\frac{v}{2}

respectively have the same range. If

Q

is thrown at an angle of

15 °

to the horizontal,

P

must be thrown at an angle of

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

When an object is shot from the bottom of a long smooth inclined plane kept at an angle

60 °

with horizontal, it can travel a distance

x_{1}

along the plane. But, when the inclination is decreased to

30 °

and the same object is shot with the same velocity, it can travel

x_{2}

distance. Then

x_{1} : x_{2}

will be

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A stone is projected with velocity

2 \sqrt{g h}

, so that it just clears two walls of equal height

h

, at distance of

2 h

from each other. The time interval of passing between the two walls is

HARD

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A small boy is throwing a ball towards a wall

6 m

in front of him. He releases the ball at a height of

1.4 m

from the ground. The ball bounces from the wall at a height of

3 m

, rebounds from the ground and reaches the boy's hand exactly at the point of release. Assuming the two bounces (one from the wall and the other from the ground) to be perfectly elastic, how far ahead of the boy did the ball bounce from the ground?

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A boy is standing on top of a tower of height,

85 m

and throws a ball in the vertically upward direction with a certain speed. If

5.25 s

later he hears the ball hitting the ground, then the speed with which the boy threw the ball is (take

g = 10 m s^{- 2},

the speed of sound in air is

340 m s^{- 1}

)

HARD

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The horizontal range and maximum height attained by a projectile are

R

and

H

respectively. If a constant horizontal acceleration

a = \frac{g}{4}

is imparted to the projectile due to wind, then its horizontal range and maximum height will be

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A projectile is given an initial velocity of

(\hat{i} + 2 \hat{j}) m s^{- 1}

, where

\hat{i}

is along the ground and

\hat{j}

is along the vertically upward direction. If

g = 10 m s^{- 2}

, the equation of its trajectory is :

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

An aeroplane is flying in a horizontal direction with a velocity

u

and at a height of

2000 m

. When it is vertically below a point

A

on the ground a food packet is released from it. The packet strikes the ground at point

B

. If

A B = 3 km

and

g = 10 m s^{- 2}

, then the value of

u

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two balls are projected at an angle

θ

and

(90 ° - θ)

with respect to the horizontal with the same speed. The ratio of their maximum vertical heights is

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The velocity of a projectile at the initial point $A$ is $(2 \hat{i} - 3 \hat{j}) m s^{- 1}$ . Its velocity (in $m s^{- 1}$ ) at point $B$ is

Question Image

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Four projectiles are fired with the same velocities at angles

25 °, 40 °, 55 °

and

70 °

with the horizontal. The range of projectile will be largest for the one projected at angle _____.

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A projectile is given an initial velocity of

(\hat{i} + \sqrt{3} \hat{j}) m s^{- 1},

where

\hat{i}

is along the ground and

\hat{j}

is along the vertical. Then, the equation of the path of projectile is

[

Take,

g = 10 m s^{- 2}]

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The position of a projectile launched from the origin at t = 0 is given by

\vec{r} = (40 \hat{i} + 50 \hat{j}) m

at t = 2s. If the projectile was launched at an angle

θ

from the horizontal, then

θ

is (take g = 10 ms^-2).

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two bodies are projected at angles

θ

and

(90^{o} - θ)

to the horizontal with the same speed. The ratio of their times of flight is

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two guns

A

and

B

can fire bullets at speeds

1 km s^{- 1}

and

2 km s^{- 1}

respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by the bullets fired by the two guns, on the ground is:

A shell is fired from a cannon with velocity v m s-1 at an angle θ with the horizontal direction. At the highest point in its path, it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m s-1 of the piece immediately after the explosion is

Important Questions on Physics

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