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Arshak Shan
Subject: Physics
, asked on 1/5/18
a 1kg hockey puck travelling at 2m/s collides with a 2kg hockey puck. the two pucks fly apat after the collision what is the velocity of 2kg puck
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 27/4/18
A particle is rotated in a vertical circle by connecting it to a string of length l and keeping the other end of the string fixed. The minimum speed of the particle hen the string is horizontal for which the particle ill complete the circle is
(
a
)
g
l
(
b
)
2
g
l
(
c
)
3
g
l
(
d
)
5
g
l
Answer
1
Laieeqa
Subject: Physics
, asked on 17/4/18
Solve this:
Q.12. A metallic wire of 1 m length has a mass of 10
×
10
-
3
kg. If a tension of 100 N is applied to a wire, what is the speed of transverse wave?
(1) 100 m
s
-
1
(2) 10 m
s
-
1
(3) 200 m
s
-
1
(4) 0.1 m
s
-
1
Answer
1
Isha Dixit
Subject: Physics
, asked on 16/4/18
two spring have force constant k1 and k2 (k1 > k2).on which spring is more work done if,
a) they are stretched by the same force and
b) they are stretched by the same amount
Answer
1
Manasi Mujumdar
Subject: Physics
, asked on 13/4/18
31. The capacitance of a parallel plate capacitor with air as dielectric is C. If a slab of dielectric constant
K and of the same thickness as the separation between the plates is introduced so as to fill 1/4
th
of the
capacitor (shown in figure), then the new capacitance is
(
a
)
(
K
+
2
)
C
4
(
b
)
(
K
+
3
)
C
4
(
c
)
(
K
+
1
)
C
4
(
d
)
N
o
n
e
o
f
t
h
e
s
e
Answer
1
Anjudha
Subject: Physics
, asked on 11/4/18
Q.33. A cubical vessel of height 1 m is full of water. What is the amount of work done in pumping water out of the vessel? (Take g = 10 m
s
-
2
)
(a) 1250 J
(b) 5000 J
(c) 1000 J
(d) 2500 J
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
Q.32:
32. An engine develops 10KW of power. How much time will it take to lift a mass of 200kg to a height of 40m. (g=10ms
-2
)
1) 4s 2) 5s 3) 8s 4) 10s
Answer
2
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
Solve this:
Q15. A 2kg body is dropped from height of 1m onto a spring of spring constant 800 N/m as shown in the figure. A frictional force equivalent to 0.4 kg-wt acts on the body. The speed of the body just before striking the spring will be :
1) 1 m/s
2) 2 m/s
3) 3 m/s
4) 4 m/s
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
Solve this:
22. A body of mass 2 kg is projected vertically up with a velocity of 100 ms
-1
. If it rises to a height of 400 m, the energy utilized to overcome friction is ( g=10 ms
-2
)
1) 10 KJ 2) 8 KJ 3) 1 KJ 4) 2 KJ
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
Solve this:
27. A body is moving up an inclined plane of angle
θ
with an initial kinetic energy E. The coefficient of friction between the plane and body is
μ
. The work done against friction before the body comes to rest is .
1
μ
cos
θ
E
cos
θ
+
sin
θ
2
2
μ
E
C
o
s
θ
3
μ
E
c
os
θ
μ
cos
θ
-
sin
θ
4
μ
E
c
os
θ
μ
cos
θ
+
sin
θ
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
Solve this:
Q.18. A mason worker throws the bricks to a height of 10 m, at which the bricks reach with a velocity of 6
m
s
-
1
. The percentage of energy he is wasting is nearly (g = 10 m
s
-
2
)
1) 15 %
2) 18 %
3) 220 %
4) 36 %
Answer
1
Rajarshi Das
Subject: Physics
, asked on 4/4/18
work energy theorem for constant and variable force
Answer
1
Adarsh Agrawal
Subject: Physics
, asked on 4/4/18
12. A rectangular plank of mass 'm
1
'and height 'a' is on a horizontal surface. On the top of it another rectangular plank of mass
'
m
2
'
and height 'b' is placed. The potential energy of the system is,
1
.
m
1
+
m
2
a
+
b
2
g
2
.
m
1
+
m
2
2
a
+
m
2
b
2
g
3
.
m
1
2
+
m
2
a
+
m
2
b
2
g
4
.
m
1
2
+
m
2
a
+
m
1
b
2
g
Answer
2
Sunidhi Sarmah
Subject: Physics
, asked on 2/4/18
Question no. 1 please
Q.1. The momentum of a body is given by
P
→
=
10
t
2
i
^
+
5
t
j
^
k
g
.
m
.
/
s
.
Find the force acting on the body at t = 2s.
Answer
1
Shreya Choudhary
Subject: Physics
, asked on 30/3/18
Solve this:
Q.23. A ball strikes a horizontal floor normally. One-fourth of its kinetic energy is lost in collision. The coefficient of restitution of the collision is
(1)
1
2
(2)
3
2
(3)
1
2
(4)
1
2
2
Answer
1
1
2
3
4
5
Next
What are you looking for?
Q.12. A metallic wire of 1 m length has a mass of 10 kg. If a tension of 100 N is applied to a wire, what is the speed of transverse wave?
(1) 100 m
(2) 10 m
(3) 200 m
(4) 0.1 m
a) they are stretched by the same force and
b) they are stretched by the same amount
K and of the same thickness as the separation between the plates is introduced so as to fill 1/4th of the
capacitor (shown in figure), then the new capacitance is
(a) 1250 J
(b) 5000 J
(c) 1000 J
(d) 2500 J
32. An engine develops 10KW of power. How much time will it take to lift a mass of 200kg to a height of 40m. (g=10ms-2)
1) 4s 2) 5s 3) 8s 4) 10s
Q15. A 2kg body is dropped from height of 1m onto a spring of spring constant 800 N/m as shown in the figure. A frictional force equivalent to 0.4 kg-wt acts on the body. The speed of the body just before striking the spring will be :
1) 1 m/s
2) 2 m/s
3) 3 m/s
4) 4 m/s
22. A body of mass 2 kg is projected vertically up with a velocity of 100 ms-1. If it rises to a height of 400 m, the energy utilized to overcome friction is ( g=10 ms-2)
1) 10 KJ 2) 8 KJ 3) 1 KJ 4) 2 KJ
27. A body is moving up an inclined plane of angle with an initial kinetic energy E. The coefficient of friction between the plane and body is . The work done against friction before the body comes to rest is .
Q.18. A mason worker throws the bricks to a height of 10 m, at which the bricks reach with a velocity of 6 . The percentage of energy he is wasting is nearly (g = 10 m)
1) 15 %
2) 18 %
3) 220 %
4) 36 %
Q.1. The momentum of a body is given by
Find the force acting on the body at t = 2s.
Q.23. A ball strikes a horizontal floor normally. One-fourth of its kinetic energy is lost in collision. The coefficient of restitution of the collision is
(1)
(2)
(3)
(4)