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Class 11
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Physics
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Laws of Motion
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Medium Questions
Laws Of Motion
Physics
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Statement I: The max value of force F such that the block shown does not move is
$cosθμmg $
where
$μ$
is the coefficient of friction between block end surface.
Statement II: Frictional Force = (Coefficient of friction) x (Normal reaction)
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
Medium
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A body is moving in a vertical circle such that the velocities of body at different points are critical. The ratio of velocities of body at angular displacements
$60_{0}$
and
$120_{0}$
from the lowest point is:
A
$5 :2 $
B
$3 :2 $
C
$3 :1$
D
$2 :1$
Medium
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Consider the quantities, pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantities are
A
Impulse, pressure and area
B
Impulse and area
C
Area and gravitational potential
D
Impulse and pressure
Medium
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A water bucket of mass '
$m$
' is revolved in a vertical circle with the help of a rope of length '
$r$
'. If the velocity of the bucket at the lowest point is
$7gr $
. Then the velocity and tension in the rope at the highest point are:
A
$3gr ,2mg$
B
$2gr ,mg$
C
$gr ,mg$
D
$Zero$
,
$Zero$
Medium
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A person carries a hammer on his shoulder and holds the other end of its light handle in his hand. Let
$y$
be the distance between his hand and the point of support. If the person changes
$y$
, the pressure on his hand will be proportional to:
A
$y$
B
$y_{2}$
C
$y1 $
D
$y_{2}1 $
Medium
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An impulse is supplied to a moving object with the force at an angle of
$120_{0}$
with the velocity vector. The angle between the impulse vector and the change in momentum vector is
A
$120_{0}$
B
$0_{0}$
C
$60_{0}$
D
$240_{0}$
Medium
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>
A pilot of mass
$m$
can bear a maximum apparent weight
$7$
times of
$mg$
. The aeroplane is moving in a vertical circle. If the velocity of aeroplane is
$210m/s$
while driving up from the lowest point of vertical circle, the minimum radius of vertical circle should be:
A
$375m$
B
$420m$
C
$750m$
D
$840m$
Medium
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A bog of mass
$m=50gm$
is oscillating with the help of a string, the maximum value of angle from the vertical attained by the bog is
$60_{o}$
.The tension in the string at extreme position is
A
0.25 N
B
1N
C
1.5 N
D
2N
Medium
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>
A simple pendulum is oscillating with an angular amplitude
$60_{0}$
. If mass of bob is
$50g$
, the tension in the string at mean position is:
Consider:
$g=10ms_{−2}$
, length of the string,
$L=1m$
.
A
$0.5N$
B
$1N$
C
$1.5N$
D
$2N$
Medium
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A body of mass m is rotated at uniform speed along a vertical circle with the help of light string. If
$T_{1}andT_{2}$
are tensions in the string when the body is crossing highest and lowest point of the vertical circle respectively, then which of the following expressions is correct?
A
$T_{2}−T_{1}=6mg$
B
$T_{2}−T_{1}=4mg$
C
$T_{2}−T_{1}=2mg$
D
$T_{2}−T_{1}=mg$
Medium
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