Solve
Study
Textbooks
Guides
Use app
Login
>>
Class 11
>>
Physics
>>
Motion in a Straight Line
>>
Hard Questions
Motion In A Straight Line
Physics
3828 Views
Easy Qs
Med Qs
Hard Qs
>
A person sitting in the rear end of the compartment throws a ball towards the front end.The ball follows a parabolic path.The train is moving with velocity of
$20m/s$
.A person standing outside on the ground also observes the ball.How will the maximum heights
$y_{m}$
attained and the ranges
$R$
seen by the thrower and the outside observer compare with each other?
A
same
$y_{m}$
different
$R$
B
same
$y_{m}$
and
$R$
C
differently
$y_{m}$
same
$R$
D
differently
$y_{m}$
and
$R$
Hard
View solution
>
A particle moves with a non zero initial velocity
$v_{0}$
and retardation
$kv$
, where
$v$
is the velocity at any time
$t$
.
A
The particle will cover a total distance
$kv_{0} $
B
The particle comes to rest at
$t=k1 $
C
Particle continues to move for long time
D
at time
$α1 ,v=2v_{0} $
Hard
View solution
>
Mass
$A$
is released from rest at the top of a frictionless inclined plane
$18m$
long and reaches the bottom
$3s$
later. At the instant when
$A$
is released, a second mass
$B$
is projected upwards along the plate from the bottom with a certain initial velocity. Mass
$B$
travels a distance up the plane, stops and returns to the bottom so that it arrives simultaneously with
$A$
. The two masses do not collide. Initial velocity of
$B$
is
A
$4ms_{−1}$
B
$5ms_{−1}$
C
$6ms_{−1}$
D
$7ms_{−1}$
Hard
View solution
>
STATEMENT-1: For an observer looking out through the window of a fast moving train, the nearby objects appear to move in the
opposite direction to the train, while the distant objects appear to be stationary.
STATEMENT-2:
If the observer and the object are moving at velocities
$V_{1}$
and
$V_{2}$
respectively with reference to a laboratory frame, the velocity of the object with respect to the observer is
$V_{2}−V_{1}$
.
A
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
B
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
C
STATEMENT -1 is True, STATEMENT-2 is False
D
STATEMENT -1 is False, STATEMENT-2 is True
Hard
View solution
>
The displacement of a particle moving in a straight line is given by
$x=16t−2t_{2}$
(where,
$x$
is in meters and
$t$
is in second). The distance traveled by the particle in
$8$
seconds [starting from
$t$
$=$
0] is
A
$24m$
B
$40m$
C
$64m$
D
$80m$
Hard
View solution
>
A water tap leaks such that water drops fall at regular intervals. Tap is fixed
$5m$
above the ground. First drop reaches the ground and at that very instant third drop leaves the tap. At this instant the second drop is at a height of
A
$3m$
B
$4.5m$
C
$3.75m$
D
$2.5m$
Hard
View solution
>
A train of length
$l=350m$
starts moving rectilinearly with constant acceleration
$ω=3.0⋅10_{−2}m/s_{2}$
;
$t=30s$
after the start the locomotive headlight is switched on (event 1), and
$τ=60s$
after that event the tail signal light is switched on (event 2) . At what constant velocity
$V$
(in m/s) relative to the Earth must a certain reference frame
$K$
move for the two events to occur in it at the same point? (round off your answer to the nearest integer)
Hard
View solution
>
A ball is thrown vertically upwards (relative to the train) in a compartment of a moving train. The face of the person sitting inside the compartment is towards engine of the train.
A
The ball will maintain the same horizontal velocity as that of the person (or the compartment) at the time of throwing.
B
If the train is accelerating then the horizontal velocity of the ball will be different from that of the train velocity, at the time of throwing.
C
If the ball appears to be moving backward to the person sitting in the compartment it means that speed of the train is increasing.
D
If the ball appears to be moving ahead of the person sitting in the compartment it means the train's motion is retarding.
Hard
View solution
>
Using the table given below where the values of velocity at the end of t seconds for a body under linear motion are given
$V(ms_{−1})$
0
6
12
24
30
36
42
$t(s)$
0
2
4
8
10
12
14
What can be concluded about the motion of the body?
A
It moves with uniform speed.
B
It moves with uniform motion
C
It moves with uniform velocity
D
It moves with uniform acceleration
Hard
View solution
>
The acceleration (a) of a particle is plotted on the Y-axis while the time (t) elapsed is plotted along the X - axis. What does the a - t graph give?
A
The distance covered
B
The difference in velocities
C
The difference in acceleration
D
The difference in force
Hard
View solution
>