Asked/Added Questions From NCERT:

 T = 24 h and h = 36,000 km.

-Answered by Shruti Srivastva On 17 July 2020:06:04:42 PM

∴ Weight of the body = mg = ∪/r.

-Answered by Shruti Srivastva On 17 July 2020:06:05:34 PM

 Because it arives due to attractive force of gravitation

-Answered by Shruti Srivastva On 17 July 2020:06:08:34 PM

 Refer to point 28 of Glimpses .

-Answered by Shruti Srivastva On 17 July 2020:06:09:58 PM

 Rakesh Sharma is India's first cosmonuat.

-Answered by Shruti Srivastva On 17 July 2020:06:10:32 PM

 T₁ / T₂ = ( r₁ /r₂ ) ^3/2 = ( 10^{11 /} 10¹⁰ )^3/2 = 10^3/2 = 10√10.

-Answered by Shruti Srivastva On 17 July 2020:06:10:57 PM

 The value of 'g' increaces by 2 %.

-Answered by Shruti Srivastva On 17 July 2020:06:14:53 PM

 The value of 'g' slightly increaces .

-Answered by Shruti Srivastva On 17 July 2020:06:15:34 PM

 h = 2x.

-Answered by Shruti Srivastva On 17 July 2020:06:16:18 PM

-Answered by Anjali Kumari On 18 October 2020:06:27:38 PM

 Zero, because the value of 'g' is zero at the centre of the earth.

-Answered by Shruti Srivastva On 17 July 2020:06:17:46 PM

 The universal gravitational constant may be defined as the force of attraction between two bodies of unit mass each and placed unit distance a part.

-Answered by Shruti Srivastva On 17 July 2020:06:18:58 PM

Required kinetic energy.

= 12 m x ( escape velocity )²

 = 12 m ( √2gR )²

-Answered by Shruti Srivastva On 17 July 2020:06:21:57 PM

 Ariana Passenger Pay Load Experiment.

-Answered by Shruti Srivastva On 17 July 2020:06:24:46 PM

 Refer to point 24 of Glimpses.

-Answered by Shruti Srivastva On 17 July 2020:06:25:29 PM

 The negative sign showns that the gravitational potential entry of one body is due to the attractive gravitational force exerted by the other body.

-Answered by Shruti Srivastva On 17 July 2020:06:26:03 PM

 A body is in a state of weightlessness inside a spacecraft i.e. g=o 

∴       T=2π √lg = ∞

-Answered by Shruti Srivastva On 17 July 2020:06:28:01 PM

 Kepler's law of planetry motion.

-Answered by Shruti Srivastva On 17 July 2020:06:30:26 PM

 Kepler's law of areas is based on the law of conversation of angular momentum.

-Answered by Shruti Srivastva On 17 July 2020:06:31:07 PM

 In a freely falling cabin, g = 0.

-Answered by Shruti Srivastva On 17 July 2020:06:32:05 PM

 The satelite will fall on the earth.

-Answered by Shruti Srivastva On 17 July 2020:06:33:20 PM

 A geostationery satelite can be used to communicate radio, T.V. and telephone signals between any two points of the earth.

-Answered by Shruti Srivastva On 17 July 2020:06:33:43 PM

(i) High value of acceleration due to gravity on the planet.

(ii) Low surface temperature on the planet.

-Answered by Shruti Srivastva On 17 July 2020:06:35:05 PM

 Orbital speed of a satelite revolving at a height h is 

v₀ = √GMR+H 

Clearly smaller the height h, larger is the orbital speed v₀. Hence the satellite revolving closer to the earth's surface has larger speed v₀.

-Answered by Shruti Srivastva On 17 July 2020:06:36:23 PM

-Answered by Shruti Srivastva On 17 July 2020:06:39:42 PM

 11.2 kms^-1, because the escape velocities does not depend on the mass of the body projected.

-Answered by Shruti Srivastva On 17 July 2020:06:40:17 PM

The net force on it IS F.

-Answered by Shruti Srivastva On 17 July 2020:06:42:49 PM

-Answered by Shruti Srivastva On 17 July 2020:06:43:33 PM

The sence of rotation of a geostationery satellite  is west to east.

-Answered by Shruti Srivastva On 17 July 2020:06:43:54 PM

-Answered by Shruti Srivastva On 17 July 2020:06:45:57 PM

 By the means of satelites in stationery orbits, television programmes can be transmitted caontinouely from one part of the world to the other parts.

-Answered by Shruti Srivastva On 17 July 2020:06:46:34 PM

The orbit of a geostationery satelite is called parking orbit.

-Answered by Shruti Srivastva On 17 July 2020:06:48:30 PM

-Answered by Shruti Srivastva On 17 July 2020:06:52:12 PM

 Yes, when the K.E. o the satellite is doubled, its orbital velocity increases √2 times and becomes equal to the escape velocity. So the satellite will escape.

-Answered by Shruti Srivastva On 17 July 2020:05:27:05 PM

T = 2π√(R+h)³GM.

Clearly when h decreases, T also decreases.

-Answered by Shruti Srivastva On 17 July 2020:05:23:34 PM

 V_e = √2v₀ = √2 x 8 = 11.3 kms^-1.

-Answered by Shruti Srivastva On 17 July 2020:05:22:12 PM

 This is because the r.m.s. speed of hydrogen molecules is four times that of oxygen molecules.

-Answered by Shruti Srivastva On 16 July 2020:06:06:47 PM

                         v_e ∝ √p

-Answered by Shruti Srivastva On 16 July 2020:06:03:52 PM

-Answered by Shruti Srivastva On 16 July 2020:06:02:02 PM

 v_moon = 2.4 kms^-1 and v_sun = 620 kms^-1.

-Answered by Shruti Srivastva On 16 July 2020:05:59:19 PM

Orbital velocity related velocity of escape from that planet is  v_{e = √2v0}. 

-Answered by Shruti Srivastva On 16 July 2020:05:56:29 PM

-Answered by Shruti Srivastva On 16 July 2020:05:48:29 PM

-Answered by Shruti Srivastva On 16 July 2020:05:46:09 PM

Escape velocity is defined as the minimum velocity with which a body must be thrown vertically upwards in order that it may just escape the gravitational pull of the earth.

-Answered by Shruti Srivastva On 16 July 2020:05:42:37 PM

 The gravitational force of attraction exerted by the planet provides the necessary centripetal force to the satellite?

-Answered by Shruti Srivastva On 16 July 2020:05:40:15 PM

 Because it arises due to attractive forces of gravitation.

-Answered by Shruti Srivastva On 16 July 2020:05:38:04 PM

Gravitational intensity at a point is equal to the negative of the potential gradient at that point.

-Answered by Shruti Srivastva On 16 July 2020:05:35:36 PM

 The value of the gravitational intensity at the earth's surface and at the earth's centre  is 9.8 N kg^-1 , zero.

-Answered by Shruti Srivastva On 16 July 2020:05:32:25 PM

 Zero is the value of gravitational potential energy at infinity.

-Answered by Shruti Srivastva On 16 July 2020:05:30:48 PM

                                            GMm/r.

-Answered by Shruti Srivastva On 16 July 2020:05:27:22 PM

 No, effect on our weight due to revolution of the earth about the sun.

-Answered by Shruti Srivastva On 16 July 2020:05:22:12 PM

 The value of g does not change.

-Answered by Shruti Srivastva On 16 July 2020:05:20:25 PM

 The weight of the bodies will increase.

-Answered by Shruti Srivastva On 16 July 2020:05:18:00 PM

 The gravitational attraction of the sun provide the centripetal force to keep the earth in stable orbit around the earth.

-Answered by Shruti Srivastva On 16 July 2020:05:13:47 PM

 The mass of the body will remain 5 kg at the centre of the earth because it remains the same at all places.

-Answered by Shruti Srivastva On 16 July 2020:01:58:15 PM

 Zer, because the intensity of a gravitational field inside a hollow spare is zero.

-Answered by Shruti Srivastva On 16 July 2020:01:56:04 PM

 At the centre of the earth, g = o.

∴  T = 2π √1/g = ∞.

-Answered by Shruti Srivastva On 16 July 2020:01:53:12 PM

 When taken from earth to moon, the weight of a body gradually decreases to zero. It then increases till at the moon' surface, it becomes mg/6. However, its initial and gravitational masses unchanged.

-Answered by Shruti Srivastva On 16 July 2020:01:49:47 PM

 d = 2h

-Answered by Shruti Srivastva On 16 July 2020:01:44:30 PM

 The acceleration due to gravity is minimum at the equator and gradually increases from equator to poles.

-Answered by Shruti Srivastva On 16 July 2020:01:40:36 PM

 Acceleration due to gravity decreaces with altitude.

-Answered by Shruti Srivastva On 16 July 2020:01:37:54 PM

 (i) The shape of the earth .

(ii) latitude

(iii) altitude

(iv) depth.

-Answered by Shruti Srivastva On 16 July 2020:01:35:35 PM

 Different planets have different escape velocities (v_e = √2GM/R) because of their different masses and sizes.

-Answered by Shruti Srivastva On 16 July 2020:01:32:27 PM

 No, gravity is not any effect of internal mass.

-Answered by Shruti Srivastva On 16 July 2020:01:31:01 PM

 The two bodies interact gravitationally due to their masses, so they exert equal force on each other but in opposite directions.

-Answered by Shruti Srivastva On 16 July 2020:01:28:43 PM

 zero.

-Answered by Shruti Srivastva On 16 July 2020:01:25:53 PM

-Answered by Shruti Srivastva On 16 July 2020:01:20:54 PM

p = 3g4πgr. 

-Answered by Shruti Srivastva On 16 July 2020:01:15:41 PM

g = GM_eR_e² 

-Answered by Shruti Srivastva On 16 July 2020:01:12:16 PM

 F_es / F_PS = (r_ps / r_es)  =  (40 / 1 )² = 1600:1.

-Answered by Shruti Srivastva On 16 July 2020:01:08:29 PM

-Answered by Shruti Srivastva On 16 July 2020:01:01:38 PM

 0.25 N, because F ∝  1 / r².

-Answered by Shruti Srivastva On 16 July 2020:12:57:33 PM

 Yes, they obey Newton's third law of motion.

-Answered by Shruti Srivastva On 16 July 2020:12:53:52 PM

  The apparatus used for the experimental determination of G Cavedish's torsion balance.

-Answered by Shruti Srivastva On 16 July 2020:12:51:12 PM

 Lord Cavedish is first determined the value of G experimentally

-Answered by Shruti Srivastva On 16 July 2020:12:49:19 PM

 g is a vector and G is a scalar.

-Answered by Shruti Srivastva On 16 July 2020:12:46:51 PM

 While the value of g and varies from the place to place, the value of G remain the same throughout the universe.

-Answered by Shruti Srivastva On 16 July 2020:12:43:30 PM

 At the center of the earth g is zero, while G =  6.67 x 10^-11 Nm² Kg^-2 .

-Answered by Shruti Srivastva On 16 July 2020:12:39:23 PM

 Yes, this acceleration is called acceleration due to gravity. 

-Answered by Shruti Srivastva On 16 July 2020:12:37:10 PM

-Answered by Shruti Srivastva On 16 July 2020:12:34:30 PM

 G is a universal constant, so its value on the moon = 6.67 x 10^-11 Nm² Kg^-2 .

-Answered by Shruti Srivastva On 16 July 2020:12:32:32 PM

 No, F = Gm₁m₂ / r²    

^{Is independent of the presence of other bodies and properties of intervening medium.}    

-Answered by Shruti Srivastva On 16 July 2020:12:25:57 PM

 Refer to point 2 of glimpses. 

-Answered by Shruti Srivastva On 16 July 2020:12:23:31 PM

 The motion of a body under the influence of gravity alone is called a free fall.

-Answered by Shruti Srivastva On 16 July 2020:12:21:43 PM

 Gravitation is the force of attraction between any two bodies in the universe while gravity refers to the force of attraction between any body and the earth.

-Answered by Shruti Srivastva On 16 July 2020:12:19:22 PM

-Answered by priyanshu kumar On 05 October 2019:02:22:13 PM

-Answered by priyanshu kumar On 05 October 2019:02:22:54 PM

-Answered by priyanshu kumar On 05 October 2019:02:23:08 PM

-Answered by priyanshu kumar On 05 October 2019:02:23:19 PM

Mass is more fundamental than weight because the mass of a body remains constant while its weight changes from place to place due to change in the value of g.

-Answered by Akki chauhan On 22 August 2019:11:02:02 AM

When we move our finger, the distance between the objects and our finger changes. Hence, the force of attraction changes, disturbing the entire universe, including the stars.

-Answered by Akki chauhan On 22 August 2019:11:03:48 AM

Gravitational force of attraction due to earth provides the centripetal force, which keeps the moon in orbit around the earth. More ever, this gravitational force acts perpendicular to the velocity of the moon.

-Answered by Akki chauhan On 22 August 2019:11:06:00 AM

 It get Double 

-Answered by Master Purushottam On 22 August 2019:04:14:47 PM

No, it is not possible to shield a body from gravitational effects because gravitational interaction does not depend upon the nature of the intervening medium.

-Answered by Akki chauhan On 22 August 2019:11:09:15 AM

 1:1, because the gravitational force does not depend on the nature of the medium.

-Answered by Akki chauhan On 22 August 2019:11:10:40 AM

This is because the value of G is same for any pair of the bodies in the universe. It does not depend on the nature of the medium between the two bodies or on the nature of the bodies themselves.

-Answered by Akki chauhan On 22 August 2019:11:11:27 AM

This is because of the fact that the law of gravitation holds good for any pair bodies in the universe whether microscopically small or astronomically large in size.

-Answered by Akki chauhan On 22 August 2019:10:47:52 AM

 Relative density = 

Density of substancesDensity of water 

-Answered by Akki chauhan On 22 August 2019:10:28:03 AM

Relative density has no units.

-Answered by Akki chauhan On 22 August 2019:10:28:06 AM

 It is used in

(i) designing ships

(ii) Submarines.

-Answered by Akki chauhan On 22 August 2019:10:28:11 AM

 Archimedes principal: When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid dispalced by it.

-Answered by Akki chauhan On 22 August 2019:10:28:14 AM

Weight of fluid displaced = pgV Where p is the density. Hence, buoyant force increases with increasing density of fluid.

-Answered by Akki chauhan On 22 August 2019:10:28:17 AM

-Answered by Akki chauhan On 22 August 2019:10:28:19 AM

Pressure= Thrust/Area.

-Answered by Akki chauhan On 22 August 2019:10:28:31 AM

 Pressure is defined as thrust per unit area .the unit of pressure 

is pascal. One pascal is the pressure exerted when 1N force acts as a surface area of 1m².

-Answered by Akki chauhan On 22 August 2019:10:28:34 AM

 The coin sinks as its density is greater than water. 

-Answered by Akki chauhan On 22 August 2019:10:28:37 AM

A body will float if its density is less than that of water.

-Answered by Akki chauhan On 22 August 2019:10:28:40 AM

Force acting perpendicular to a surface is called thrust.

-Answered by Akki chauhan On 22 August 2019:10:44:28 AM

 Mass:-

1. We can measure of an object by its inertia. 

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the object remains constant at all the places.

4. Measurement of mass is done by using a pan or beam balance.

5.Mass of a body cannot change even value of g is zero at any place.

Weight:-

1. Weight=mass ×acceleration 

2. The gravitational force by which earth attracts an object is called weight of the object.

3. Weight of the object is different at all different places.

4. Measurement of weight is done by using a spring balance. 

5. Weight of the object becomes zero if g is zero. 

-Answered by Master Purushottam On 22 August 2019:09:13:04 PM

Mass:- 

1. We can measure mass of an object by its inertia.

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the body remains constant at all places. 

4. Measurement of mass is done by using a pan or beam balance. 

5. Mass does not change even value of g is zero at any place.

Weight:-

1. Weight= mass × acceleration.

2. The gravitational force by which earth attracts an object is called weight of the object. 

3. Weight of the object is different at different places.

4. Measurement of weight is done by using a spring balance.

5. Weight of the object becomes zero if g is zero. 

-Answered by Master Purushottam On 22 August 2019:09:13:38 PM

 Gravitational Constant (G) :-

1. Its value is 6.6734×10^-11 Nm²/Kg².

2. Its value remains constant always and everywhere.

3. Its S.I unit is Nm²/kg².

4. It is Scaler Quantity. 

 Gravitational acceleration (g):-

1. Its value is 9.8 m/s².

2. Its value varies at different Places. 

3. Its unit is m/s².

4. It is a vector Quantity.

-Answered by Master Purushottam On 22 August 2019:09:13:56 PM

-Answered by Rahul Kumar On 13 October 2019:09:59:39 AM