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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
Khyati
Subject: Physics
, asked on 28/3/18
A person having mass 60kg is standing on a stationary raft in a river. The mass of raft is 40kg. The distance between person and bank is 30m . The person niw starts running towards the bank with velocity of 10mpersec. How far will the person be from the bank after one second.
Answer
1
Devjeet
Subject: Physics
, asked on 25/3/18
mv
'
2
r
>
mg
cos
θ
Why is the answer not option c ? Can you please solve and explain properly?:
2. For vertical circular motion if v
lowermost
point
<
5
r
g
. then
(a) the rope will slack T=mg cos
θ
(b) the rope will slack
mv
'
2
r
<
mg
cos
θ
(c) the rope will slack
mv
'
2
r
>
mg
cos
θ
(d) rope will leave the circular path at the very next moment when mv'
2
mv
'
2
r
=
mg
cos
θ
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
↵
Please
explain and give reason.
39
A truck and a car are with Velocity v
towards each other. They collide head in and
Stops after Some time. If the time Of collision is 1s.
which vehicle will have maximum in change in momentum?
(1) car
(2) truck
(3) Both will have same
(4) None of these
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
Find the value of T. Solve it.
T
-
3
x
9
.
8
=
3
a
-
-
-
-
(
1
)
T
-
7
x
9
.
8
=
7
a
-
-
-
-
-
(
2
)
Answer
1
Divya Mahesh
Subject: Physics
, asked on 23/3/18
A
b
o
d
y
i
s
a
m
d
e
i
n
t
h
e
f
o
r
m
o
f
w
e
d
g
e
w
i
t
h
a
n
a
n
g
l
e
45
∘
.
S
e
e
f
i
g
u
r
e
.
A
b
a
l
l
o
f
m
a
s
s
m
,
m
o
v
i
n
g
h
o
r
i
z
o
n
t
a
l
l
y
a
t
a
s
p
e
e
d
v
0
=
2
m
/
s
,
c
o
l
l
i
d
e
s
w
i
t
h
t
h
e
w
e
d
g
e
o
f
m
a
s
s
M
=
2
m
.
A
s
a
r
e
s
u
l
t
o
f
t
h
e
i
m
p
a
c
t
,
t
h
e
b
a
l
l
b
o
u
n
c
e
s
v
e
r
t
i
c
a
l
l
y
u
p
w
a
r
d
.
N
e
g
l
e
c
t
t
h
e
f
r
i
c
t
i
o
n
b
e
t
w
e
e
n
t
h
e
w
e
d
g
e
a
n
d
h
o
r
i
z
o
n
t
a
l
s
u
r
f
a
c
e
.
T
h
e
s
p
e
e
d
o
f
t
h
e
b
a
l
l
j
u
s
t
a
f
t
e
r
t
h
e
i
m
p
a
c
t
i
s
(
1
)
0
.
5
m
/
s
(
2
)
2
m
/
s
(
3
)
2
m
/
s
(
4
)
1
m
/
s
Answer
1
Divya Mahesh
Subject: Physics
, asked on 23/3/18
Solve this.
Answer
1
Divya Mahesh
Subject: Physics
, asked on 23/3/18
A
sin
g
l
e
h
o
r
i
z
o
n
t
a
l
f
o
r
c
e
F
i
s
a
p
p
l
i
e
d
t
o
a
b
l
o
c
k
o
f
m
a
s
s
M
1
,
w
h
i
c
h
i
s
i
n
c
o
n
t
a
c
t
w
i
t
h
a
n
o
t
h
e
r
b
l
o
c
k
o
f
m
a
s
s
M
2
a
s
s
h
o
w
n
i
n
t
h
e
f
i
g
u
r
e
.
I
f
t
h
e
s
u
r
f
a
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s
a
r
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f
r
i
c
t
i
o
n
l
e
s
s
,
t
h
e
f
o
r
c
e
b
e
t
w
e
e
n
t
h
e
b
l
o
c
k
i
s
(
1
)
M
1
F
M
2
(
2
)
M
1
F
M
1
+
M
2
(
3
)
M
2
F
M
1
+
M
2
(
4
)
M
2
F
M
1
Answer
1
Divya Mahesh
Subject: Physics
, asked on 23/3/18
T
w
o
b
o
d
i
e
s
o
f
m
a
s
s
e
s
m
a
n
d
3
m
,
m
o
v
i
n
g
w
i
t
h
v
e
l
o
c
i
t
i
e
s
3
v
a
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d
v
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s
p
e
c
t
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y
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s
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m
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d
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r
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c
t
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o
n
,
c
o
l
l
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d
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w
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t
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e
a
c
h
o
t
h
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r
.
A
f
t
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r
c
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r
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o
c
i
t
y
V
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n
t
h
e
s
a
m
e
d
i
r
e
c
t
i
o
n
.
T
h
e
n
(
1
)
V
=
v
(
2
)
V
=
3
2
v
(
3
)
V
=
2
v
(
4
)
V
=
4
3
v
Answer
1
Erw Trjerth
Subject: Physics
, asked on 18/3/18
Q What is the safe maximum speed of a car on a level road taking a sharp circular turn of radius 4 m without reducing the speed , if coefficient of static friction between the tyre and road is 0.1
Answer
1
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What are you looking for?
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
2. For vertical circular motion if vlowermost point<. then
(a) the rope will slack T=mg cos
(b) the rope will slack
(c) the rope will slack
(d) rope will leave the circular path at the very next moment when mv'2
39 A truck and a car are with Velocity v
towards each other. They collide head in and
Stops after Some time. If the time Of collision is 1s.
which vehicle will have maximum in change in momentum?
(1) car
(2) truck
(3) Both will have same
(4) None of these