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Tulsi Mehta
Subject: Physics
, asked on 25/12/17
55) A horizontal force 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2, the weight of the block is.
(1) 20 N
(2) 50 N
(3) 100 N
(4) 2 N
56) In the figure shown , the coefficient of static friction between the block A of mass 20 kg and horizontal table is 0.2. What should be the minimum mass of hanging block just beyond which block stars moving?
(1) 2 kg
(2) 3 kg
(3) 4 kg
(4) 5 kg
Answer
1
Soumyadeep Kar
Subject: Physics
, asked on 21/12/17
Solve this :
12
.
W
h
i
c
h
o
f
t
h
e
f
o
l
l
o
w
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f
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r
c
e
s
a
r
e
c
o
n
s
e
r
v
a
t
i
v
e
?
(
x
,
y
a
r
e
c
o
o
r
d
i
n
a
t
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s
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n
f
r
e
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s
p
a
c
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r
→
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s
a
p
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t
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n
v
e
c
t
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r
)
(
A
)
F
→
=
y
i
^
+
x
j
(
B
)
F
→
=
x
x
2
+
y
2
i
^
+
y
x
2
+
y
2
j
^
(
C
)
F
→
=
k
r
→
(
D
)
N
o
n
e
o
f
t
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e
s
e
Answer
1
Nura Mohammad
Subject: Physics
, asked on 15/12/17
Does the velocity of a freely falling body in vaccum changes?
Answer
1
Afrah Arshya
Subject: Physics
, asked on 9/12/17
in a nuclear reactor a neutron of high speed (typically 10
7
m/s) must be slowed to 10
3
m/s so that it can have a high probability of interacting with isotope
235
U
92
and causing it to fission. show that the neutron can lose most of its kinetic energy in an elastic collision with a light nuclei like deuterium or carbon which has a mass of only a few times like the neutron mass.The material making up the light nuclei usually heavy water or graphite is called a moderator
Answer
1
Ruba Balu
Subject: Physics
, asked on 6/12/17
5th
Which of the above graphs represents the kinetic energy of freely falling body ?
Answer
1
Ruba Balu
Subject: Physics
, asked on 6/12/17
11
Q11. A bullet of mass 10 g passing through a 5 cm plank has its velocity reduced from 300 ms
–1
to 200 ms
–1
. Find the average resistance force offered to the bullet? What thickness of plank would have just stopped the bullet?
Answer
1
Amitesh Kumar
Subject: Physics
, asked on 4/12/17
Plz fast Q)3(i)
Answer
1
Pratik Kadam
Subject: Physics
, asked on 4/12/17
Question .. 8.45
Answer
1
Nura Mohammad
Subject: Physics
, asked on 25/11/17
Solve this:
Q11.) What is meant by P
∈
in a stretched wire find a relation for it and also determine the elastic P.
∈
per unit vol of the wire .
Answer
1
Queens Land
Subject: Physics
, asked on 25/11/17
The potential energy
U
(
x
) of a particle moving along
x
-axis is given by
U
(
x
) =
ax
—
bx
2
. Find the equilibrium position of particle.
Answer
1
Queens Land
Subject: Physics
, asked on 25/11/17
The potential energy of an object of mass
m
moving in
xy
plane in a conservative field is given by
U = ax
+
by
, where
x
and
y
are position coordinates of the object. Find magnitude of its acceleration.
Answer
1
Queens Land
Subject: Physics
, asked on 25/11/17
Q 40
Q39. A 10 metric ton tuck drive up a hilly road of gradient 1 in 50 at a speed of 36 km h
–1
. If the coefficient of kinetic friction between the road and tyres is 0.2, calculate the power delivered by the engine (g = 10 ms
–2
)
Hint : weight , W = mg
component of weight down the incline = F = mg sin
Frictional force, Fr =
μ
k
mg
Total force, F' = mg sin
θ
+ F
r
Power = Fv
Q40. For Q.39, calculate how fast will the same truck move down the hill with same power .
Hint : Force on the truck when it moves down the hill is
F' = mg sin
θ
–
μ
k
mg cos
θ
Power , p = F'
√
calculate
√
.
Answer
1
Queens Land
Subject: Physics
, asked on 25/11/17
'L solve
Q
.
P
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t
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p
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s
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o
n
x
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g
i
v
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b
y
U
=
x
2
-
5
x
.
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p
a
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c
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?
(
1
)
x
=
0
(
2
)
x
=
5
(
3
)
x
=
2
.
5
(
4
)
x
=
7
.
5
Answer
1
Queens Land
Subject: Physics
, asked on 25/11/17
A block of mass
m
is released on the top of a smooth inclined plane of length
x
and inclination
θ
as shown in figure. Horizontal surface is rough. If block comes to rest after moving a distance
d
on the horizontal surface, then coefficient of friction between block and surface is
(1)
x
sin
θ
2
d
(2)
x
cos
θ
2
d
(3)
x
sin
θ
d
(4)
x
cos
θ
d
Answer
2
Mohd Abdul Fatah
Subject: Physics
, asked on 23/11/17
what is the linear momentum of a body of mass m and kinetic energy KE?
Answer
1
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Next
What are you looking for?
(1) 20 N
(2) 50 N
(3) 100 N
(4) 2 N
56) In the figure shown , the coefficient of static friction between the block A of mass 20 kg and horizontal table is 0.2. What should be the minimum mass of hanging block just beyond which block stars moving?
(1) 2 kg
(2) 3 kg
(3) 4 kg
(4) 5 kg
Q11. A bullet of mass 10 g passing through a 5 cm plank has its velocity reduced from 300 ms–1 to 200 ms–1. Find the average resistance force offered to the bullet? What thickness of plank would have just stopped the bullet?
Q11.) What is meant by P in a stretched wire find a relation for it and also determine the elastic P. per unit vol of the wire .
Q39. A 10 metric ton tuck drive up a hilly road of gradient 1 in 50 at a speed of 36 km h–1. If the coefficient of kinetic friction between the road and tyres is 0.2, calculate the power delivered by the engine (g = 10 ms–2)
Hint : weight , W = mg
component of weight down the incline = F = mg sin
Frictional force, Fr = mg
Total force, F' = mg sin + Fr
Power = Fv
Q40. For Q.39, calculate how fast will the same truck move down the hill with same power .
Hint : Force on the truck when it moves down the hill is
F' = mg sin – mg cos
Power , p = F' calculate .
(1) (2) (3) (4)