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Rajarshi Das
Subject: Physics
, asked on 4/4/18
what is escape velocity and what is its value for Earth
Answer
1
Rajarshi Das
Subject: Physics
, asked on 4/4/18
what is orbital velocity and show that it does not depend on the mass of the body
Answer
1
Rajarshi Das
Subject: Physics
, asked on 4/4/18
explain the variation of g with height depth and shape of Earth
Answer
1
Shreya Choudhary
Subject: Physics
, asked on 30/3/18
Solve this:
27. A satellite going around the earth in a circular orbit loses some energy due to collision. Its speed is V and distance from the earth is d, then due to this collision.
(1) d will increase the v will increase.
(2) d will increase and v will remain constant
(3) d will decrease and will decrease .
(4) d will decrease and v will increase.
Answer
1
Shreya Choudhary
Subject: Physics
, asked on 30/3/18
Solve this:
26. Two small satellites move in circular orbits around the earth at a distance R and R+
△
R from the centre of the earth. Their time period of rotation are T and T+
△
T respectively, then.
1
△
T
=
3
2
T
△
R
R
2
△
T
=
3
3
T
△
R
R
3
△
T
=
T
△
R
R
4
△
T
=
3
T
△
R
R
Answer
1
Shreya Choudhary
Subject: Physics
, asked on 30/3/18
Solve this :
25. A frictionless tunnel is made along the chord AB of the earth as shown. An object of mass m is released at point B from rest. Time period of oscillation of the object along the chord is :
(
1
)
π
2
R
g
(
2
)
π
R
g
(
3
)
R
g
(
4
)
2
π
R
g
Answer
1
Yashi Mishra
Subject: Physics
, asked on 30/3/18
Q17. Escape velocity of an atmospheric particle which is 1000 km above the earth's surface, is (radius of earth is 6400 km and g = 9.8 m/s
2
)
(1) 6.5 km/s (2) 8 km/s
(3) 10 km/s (4) 11.2 km/s
Answer
1
Abhranil Dey
Subject: Physics
, asked on 27/3/18
Calculate angular velocity of geostationary satellite
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
A spring balance measures the weight of an object in air to be 0.1 N. It shows a reading of 0.08 N when the object is completely immersed in water. If the value of acceleration due to gravity is 10 m/s
2
the volume of the object is
(1) 20 cm
3
(2) 80 cm
3
(3) 200 cm
3
(4) 2 cm
3
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
Two objects one 4 times as massive as the other, are approaching each other under their mutual gravitational attraction.When the separation between the objects is 100 km,the acceleration of the lighter object is m/s
2
,when the separation between them is 25km,the acceleration of the heavier object is
(1) 1 m/s
2
(2) 2 m/s
2
(3) 8 m/s
2
(4) 4 m/s
2
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
Two planets 'A' and 'B' of same mass and same radius are shown in the figure ρ
1
and ρ
2
are densities of the materials in the planets and ρ
1
> ρ
2
. If the accelerations due to gravity on the surfaces of the planets A and B are
g
A
and
g
B
respectively, then
(1) Given information is not sufficient
(2)
g
A
<
g
B
(3)
g
A
>
g
B
(4)
g
A
=
g
B
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
Solve this in detail.
48. A geo - stationary satellite is orbiting around earth at height of 30,000 km in circular orbit. The radius of the earth is taken as 6000 km. The geo - stationary satellite comes back to its position after one revolution is exactly 24 hours. Let the acceleration due to gravity (g) be 10 m/s
2
and mass of satellite be 1000 kg; calculate the work done in 12 hours when moving under gravitational force .
1
3
.
6
π
×
10
14
J
(
2
)
2
π
×
7
.
2
π
×
10
14
J
(
3
)
1
.
8
π
×
10
14
J
(
4
)
Zero
J
(Stage-2, 2013)
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/3/18
Solve this. Shouldn't it be 6 hours ?
46.
The radius of the orbit of a geosynchronous satellite is 36000 km, then the period of revolution of a satelite with its orbital radius 9000 km would be
(1) 24 hrs (2) 12 hrs
(3) 6 hrs (4) 3 hrs
Answer
1
Shivam Desale
Subject: Physics
, asked on 21/3/18
A cylindrical tank with a height of h=1m is filled with water up to its rim. What time is required to empty the tank through an orifice in its bottom? The cross sectional area of the orifice is (1/400)th of the tank. Find the time required for the same amount of water to flow out of the tank if the water level in the tank is maintained constant at a height of h=1m from the orifice.
Answer
1
Bhavi Sibal
Subject: Physics
, asked on 20/3/18
Q. Find the speed of each sphere when they collide with each other.
Answer
4
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What are you looking for?
27. A satellite going around the earth in a circular orbit loses some energy due to collision. Its speed is V and distance from the earth is d, then due to this collision.
(1) d will increase the v will increase.
(2) d will increase and v will remain constant
(3) d will decrease and will decrease .
(4) d will decrease and v will increase.
26. Two small satellites move in circular orbits around the earth at a distance R and R+R from the centre of the earth. Their time period of rotation are T and T+T respectively, then.
25. A frictionless tunnel is made along the chord AB of the earth as shown. An object of mass m is released at point B from rest. Time period of oscillation of the object along the chord is :
(1) 6.5 km/s (2) 8 km/s
(3) 10 km/s (4) 11.2 km/s
(1) 20 cm3
(2) 80 cm3
(3) 200 cm3
(4) 2 cm3
(1) 1 m/s2
(2) 2 m/s2
(3) 8 m/s2
(4) 4 m/s2
(1) Given information is not sufficient
(2) gA < gB
(3) gA > gB
(4) gA = gB
48. A geo - stationary satellite is orbiting around earth at height of 30,000 km in circular orbit. The radius of the earth is taken as 6000 km. The geo - stationary satellite comes back to its position after one revolution is exactly 24 hours. Let the acceleration due to gravity (g) be 10 m/s2 and mass of satellite be 1000 kg; calculate the work done in 12 hours when moving under gravitational force .
(Stage-2, 2013)
46. The radius of the orbit of a geosynchronous satellite is 36000 km, then the period of revolution of a satelite with its orbital radius 9000 km would be
(1) 24 hrs (2) 12 hrs
(3) 6 hrs (4) 3 hrs