NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
Pls solve
Q. A body of mass m makes an elastic collision with another identical body at rest. Show that if the collision is not head-on. The bodies go at right angle to each other after the collision.
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
Pls solve:
Q. A ball of mass m moving at a speed v makes a head-on collision with an identical ball a rest. The kinetic energy f the ball after the collision is three fourths of the original find the coefficient of restitution.
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
A man weighing 60 kg runs along the rails with a velocity of 18 km/h and jumps into a car of mass 100 kg standing on the rails. Calculate the velocity with which the car will start travelling along the rails.
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
Pls solve
Q. A reference frame attached to the earth cannot be an inertial frame. Explain.
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
A mass
m
rests on a horizontal surface. The coefficient of friction between the mass and the surface is µ. If the mass is pulled by a force
F
as shown in figure, the limiting friction between mass and the surface will be
(A) µ
mg
(B)
µ
m
g
-
3
2
F
(C) µ[
mg
–
F
/2] (D) µ(
mg
+
F
/2)
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
Pls solve
Answer
1
Ghosh Brothers
Subject: Physics
, asked on 14/4/18
Pls Solve
An iron nail is dropped from a height h from the level of a sand bed. If it
penetrates through a distance x in the sand before coming to rest, the
average force exerted by the sand on the nail is,
A
)
m
g
h
x
+
1
B
)
m
g
x
h
+
1
C
)
m
g
h
x
-
1
D
)
m
g
x
h
-
1
Answer
2
Champ Jee
Subject: Physics
, asked on 13/4/18
Q23.
Q23. A bead starts sliding from a point P on a frictionless wire with initial velocity of 5 ms
–1
. Find the velocity of bead at point R (take g = 10 ms
–2
)
(1) 7 m /s
(2) 5
2
m/s
(3) 6
2
m/s
(4) 6 m /s
.
Answer
1
Aaradhya Kondawar
Subject: Physics
, asked on 8/4/18
↵
Solve
this:
44.The measured mass and volume of a body are 25.00 g and 5.0 cm
3
respectively. The maximum percentage error in its density is :
1) 4%
2) 2.5 %
3) 2.2 %
4) 2.04 %
Answer
1
Aviral
Subject: Physics
, asked on 7/4/18
Q21
Q21. The friction coefficient between the board and the floor shown in figure (6-E7 ) is
μ
. Find the maximum force that the man can exert on the rope so that the board does not slip on the floor.
Answer
2
Rajarshi Das
Subject: Physics
, asked on 4/4/18
three methods to increase friction and three methods to decrease friction
Answer
1
Ranjan Shivam
Subject: Physics
, asked on 2/4/18
Q). Plot electric field vs distance graph? In which +4 q is placed at origin and - 6 q , - 2 q are separated by A and 2A respectively.
Answer
1
Priyansh
Subject: Physics
, asked on 30/3/18
Q26 please answer fast:
26. A particle of mass 4 kg has a velocity of 4 m/s . A constant force F acts on the particle for 1 second in a direction perpendicular to its initial velocity if the displacement of the particle at the end of 1 second makes an angle of tan
-1
1
2
from its initial velocity, find F.
(A) 2N (B) 4N (C) 8N (D) 16N
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 29/3/18
1. A 50 kg person stands on a 25 kg platform. He pulls massless rope which is attached to the platform via the frictionless, massless pulleys as shown in the figure. The platform moves upwards at a steady velocity if the force with which the person pulls the rope is
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 29/3/18
Solve this:
Q. A 4 kg block A is placed at the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 20N is applied on A. The maximum horizontal force F required to make both A & B move together is
1) 36 N 2) 5 N
3) 40 N 4) 60 N
Answer
1
Prev
1
2
3
4
5
Next
What are you looking for?
Q. A body of mass m makes an elastic collision with another identical body at rest. Show that if the collision is not head-on. The bodies go at right angle to each other after the collision.
Q. A ball of mass m moving at a speed v makes a head-on collision with an identical ball a rest. The kinetic energy f the ball after the collision is three fourths of the original find the coefficient of restitution.
Q. A reference frame attached to the earth cannot be an inertial frame. Explain.
(A) µmg (B) (C) µ[mg – F/2] (D) µ(mg + F/2)
An iron nail is dropped from a height h from the level of a sand bed. If it
penetrates through a distance x in the sand before coming to rest, the
average force exerted by the sand on the nail is,
Q23. A bead starts sliding from a point P on a frictionless wire with initial velocity of 5 ms–1. Find the velocity of bead at point R (take g = 10 ms–2)
(1) 7 m /s
(2) 5 m/s
(3) 6 m/s
(4) 6 m /s
.
44.The measured mass and volume of a body are 25.00 g and 5.0 cm3 respectively. The maximum percentage error in its density is :
1) 4%
2) 2.5 %
3) 2.2 %
4) 2.04 %
Q21. The friction coefficient between the board and the floor shown in figure (6-E7 ) is . Find the maximum force that the man can exert on the rope so that the board does not slip on the floor.
26. A particle of mass 4 kg has a velocity of 4 m/s . A constant force F acts on the particle for 1 second in a direction perpendicular to its initial velocity if the displacement of the particle at the end of 1 second makes an angle of tan-1 from its initial velocity, find F.
(A) 2N (B) 4N (C) 8N (D) 16N
Q. A 4 kg block A is placed at the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 20N is applied on A. The maximum horizontal force F required to make both A & B move together is
1) 36 N 2) 5 N
3) 40 N 4) 60 N