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Shivam
Subject: Physics
, asked on 1/11/17
please solve question 5
Q5. A spring held compressed. Its stored energy is 2.4 joule, Its ends are in contact with masses of 1 gm and 48 gm placed on a smooth horizontal surface. When the spring is released, the mass of 48 gm will acquire a velocity of
[1]
2
.
40
149
m
/
s
[2]
24
×
49
48
m
/
s
[3]
10
7
m
/
s
[4]
10
4
7
m
/
s
Answer
2
Shivam
Subject: Physics
, asked on 31/10/17
please solve question 5 briefly
Answer
1
Shivam
Subject: Physics
, asked on 31/10/17
please solve question 3
Answer
1
Shivam
Subject: Physics
, asked on 31/10/17
please solve question 30
Q30. A bomb at rest explodes into two parts of masses m
1
and m
2
If the momentum of the two parts be p
1
and p
2
then their kinetic energies will be in the ratio of -
(10 m
1
/m
2
(2) m
2
/m
1
(3) p
1
/p
2
(4) p
2
/p
1
Answer
2
Shivam
Subject: Physics
, asked on 31/10/17
please solve question 10, 12
Answer
1
Shivam
Subject: Physics
, asked on 31/10/17
please solve question 4
Q4. The earth circles the sum once a year. How much work would have to be done on the earth to bring it to rest relative to the sun. (ignore the rotation of earth about -its own axis). Given that mass of the earth is 6 × 10
14
kg and distance between sum and earth is 1.5 × 10
1
km.
(1) 2.7 × 10
20
J (2) 2.7 × 10
24
(3) 1.9 × 10
25
(4) 1.9 × 10
23
Answer
1
Sakshi Naik
Subject: Physics
, asked on 29/10/17
Pls give reason if the resultant force acting on a particle is perpendicular to the velocity the speed does not change and hence the kinetic energy does not change
Answer
2
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
the bob of a 2m pendulum describes has a mass of 0.5 kg calculate pe when pulled to one side work done and speed of bob when it pases through lowest point after release
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
a block starts sliding from rest on an inclined plane of angle 30 find coeff of friction of block is got to rest
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
a man of mass m falls on a spring of spring constant k show the spring will compress through a small distance given by x=root 2mgh/k
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
man on edge of roof of 20 m tall building throws a ball of mass 100 g straight up with a speed of 10 m/s and then throws a ball straight down with the same speed find ke of ball when it reaches the ground\
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
w=? in stretching a spring 10 cm from equilibrium position if spring constant is 100 n/m
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
child on swing reaches a position 2m above lowest position what is speed of swing at lowest point?
Answer
1
Sandhya Karthik
Subject: Physics
, asked on 29/10/17
a body of mass 0.5 kg slides down vertically a curved tr 3 m/s what ck in the shape of a quadrant of a circle of radius 1m at the bottom of the track the speed of the body is the work done by friction
Answer
2
Amitesh Kumar
Subject: Physics
, asked on 28/10/17
Solve this:
Q12. A block of mass
m
slides along the track with kinetic friction
μ
. A man pulls the block through a rope which makes an angle
θ
with the horizontal as shown in the figure. The block moves with constant speed v. Power delivered by man is
(a) T
υ
(b) T
υ
cos
θ
(c) (T cos
θ
–
μ
mg)
υ
(d) zero
Answer
2
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What are you looking for?
Q5. A spring held compressed. Its stored energy is 2.4 joule, Its ends are in contact with masses of 1 gm and 48 gm placed on a smooth horizontal surface. When the spring is released, the mass of 48 gm will acquire a velocity of
[1] [2] [3] [4]
Q30. A bomb at rest explodes into two parts of masses m1 and m2 If the momentum of the two parts be p1 and p2 then their kinetic energies will be in the ratio of -
(10 m1 /m2 (2) m2 /m1 (3) p1/p2 (4) p2/p1
Q4. The earth circles the sum once a year. How much work would have to be done on the earth to bring it to rest relative to the sun. (ignore the rotation of earth about -its own axis). Given that mass of the earth is 6 × 1014 kg and distance between sum and earth is 1.5 × 101 km.
(1) 2.7 × 1020 J (2) 2.7 × 1024 (3) 1.9 × 1025 (4) 1.9 × 1023
Q12. A block of mass m slides along the track with kinetic friction . A man pulls the block through a rope which makes an angle with the horizontal as shown in the figure. The block moves with constant speed v. Power delivered by man is
(a) T (b) T cos
(c) (T cos – mg) (d) zero