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Syllabus

state and prove work-energy theorem.

when an apple falls towards the earth ,the earth ,moves up to meet the apple . WHY?

Establish a relationship between g and G.

relation between escape velocity and orbital velocity

how is GM=gR^2?

if earth were suddenly shrink to half of its present radius without change in mass,what is the effect on duration of days?

mass 7.2 kgis launched from the surface of the earth to acircular orbit at a height of 350 km from the surface. In doing so, find thechange in mechanical energyof the ball.(Please explain properly)

where is the value of g maximum and minimum at the surface of earth

Find the potential energy of a system of four particles placed at the vertices of a square of side L. also obtain the potential at the centre of the square

How much above the surface of earth does the acceleration due to gravity reduces by 36% of its value on the suraface of earth. Radius of earth = 6400 km.

what is stokes law ? What is terminal velocity?

The gravitational field in a region is given by E=(2i^+3j^)N/Kg.Show that no work is done by the gravitational field when a particle is moved on the line 3y+2x=5.State and prove kepler's third law of planetary motion by assuming the orbit to be circular

Find the potential energy of a system of four particles placed at the vertices of a square of side l. Also obtain the potential at the centre of the square.

A particle is projected vertically up with velocity v=(4gRe/3)

^{1/2 }from earth surface. The velocity of particle at height equal to half of the maximum height reached by it .....?Please Define Gravitational Potential.

how many times faster than its present speed the earth should rotate so that the apparent weight of an object at equator becomes zero? Given radius of earth =6.37*106m. what would be the duration of the day in that case?

^{4}km then find the angular speed of 'B' with respect to A ?The escape speed of a projectile on the earth's surface is 11.2km/s. A body is projected out with thrice this speed, What is the speed of the body far away from the earth?ignore the presence of the sun and other planets. What's the answer for this numerical??

if radius of earth contracted by 0.1%, its mass remaining same, then weight of the body at earth's surface will increase by

a 0.1%

b 0.2%

c 0.3%

d Remains same

with reason

Two small particles of mass m each are placed at the vertices A and B of a right angle isoceles triangle right angled at C. If AB=l, find the gravitational field strength at C

derive an expression for orbital velocity of a satellite.

â€‹Q112. Two soap bubbles 'A' and 'B' are kept in a closed chamber where the air is maintained at pressure 8 N/m

^{2}. The radii of bubbles 'A' and 'B' are 2 cm and 4 cm respectively. Surface tension of the soap water used to make bubbles is 0.04 N/m. The ratio of number of moles of air in bubble 'A' to that in bubble 'B' is(1) 4 :3

(2) 9 : 4

(3) 8 : 3

(4) 1: 6

A man can jump 1.5 m high on the earth. Calculate the approximate height he might be able to jump on a planet whose density is one-quarter of the earth and the radius is one-third of the earthâ€™s radius.

what is the difference between kgf and kg wt

If the radius of Earth shrinks by 1.5%, mass remaining the same, then how would the value of acceleration due to gravity change?

The escape velocity (v ) of a body depends upon the mass (m) of body, gravitational

acceleration (g) and radius(R) of the planet .Derive the relation for escape velocity

dimensionally.

a body of mass m is raised from the earths surface to an altitude equal to the radius(R) of the earth. if g is the gravitational acceleration on earths surface the change in the potential energy of the body is,_______

Draw graphs of showing the variation acceleration due to gravity with

Show graphically how the acceleration due to gravity varies as we move from centre of earth to a great height above the surface.

weight of a body decreases by 1.5%, when it is raised to a height h above the surface of earth. when the same body is taken to same depth h in a mine, its weeight will show

a 0.75% increase

b 0.75% decrease

c 3.0% decrease

d 1.5% decrease

particle of mass m_{1 }liesinside aat aspherical shellof mass m_{2 }and radius Rdistance of r from the centre. Find thegravitational potential energy of the system.(Please explain properly and the answer given is (-Gm

_{1}m_{2})/R.)Four particles A,B,C and D each of mass m are kept at the corners of a square of side L. Now the particle D is taken to infinity by an external agent keeping the other particles fixed at their respective positions. The work done by the gravitational force acting on the particle during its movement is....?a) 0

b) -GM/2R

C) -3GM/2R

D) 3GM/2R

Two uniform solid spheres of equal radii R, but mass M & 4M have a centre to centre separation 6R. The two spheres are held fixed. A projectile of mass m is projected frm the surface of the sphere of mass M directly towrds the centre of the second sphere. Obtain an expression for the minimum speed v of the projectile so that it reaches the surface of the second sphere.

(diagram of que. is given in the textbook eg.8.4 pg 193)

At what height above earth's surface, value of g is same as in a mine 100km deep?

(A) What are the values displayed by Deepa and Shilpa?

(B) What can be the possible answer for their problem?

Please provide the answer to this question urgently.

differentiate geostationary satellite and polar satellite .

a)v' directly proportional to r^-1/2

b)v'directly proportional to r^3/2

c)v'directly proportional to r^-3/2

d)v'directly proportional to r

The escape speed of a projectile on the earth’s surface is 11.2 km s

^{–1}. A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets.^{3}kg from a circular orbit of radius 2R to that of radius 3R. Given mass of earth, M=6x10^{24}kg and radius of earth, R=6.4x10^{6}mAn object of mass m is raised from the surface of the earth to a height equal to the radius of the earth, that is taken from R to 2R from the centre of the earth. What is the gain in potential energy?

why there is no gravity in space? and if sun has gravitational force then why don't all the planet fall into sun????

the radius of the moon Rm= 1/4th the radius of earth and the mass of the moon is 1/96 the mass of the earth. calculate the escape velocity.

(I) 48 N (II) 36 N (III) 16 N (IV) 9 N

36. A satellite of mass 1000 kg moves in a circular orbit of radius 7000 km around the earth.Calculate the total energy required to place the satellite in orbit from earth's surface. Take Radius of earth = 6400 km and g =10.0

ms

^{-2.}37. An astronaut puts a ball of mass 7.2kg into a circular orbit about the earth at a height of 350 km.(i) what is the kinetic energy of the ball (ii) what is the potential energy of the ball?

38. An earth satellite makes a circular around the earth in 90 minutes. Calculate the height of satellite above theearth's surface. Radius of earth = 6400 kmand g = 9.8ms-2

39. An artificial satellite is revolving at a height of 500 km above the earth's surface in a circular orbit, completing one revolution in 98 minutes. Calculate the mass of the earth. Given, G = 6.67 x 10

^{-11}N m^{-2}kg^{-2}and R_{e}= 6.4 x 10^{6}m.40. If the period of revolution of an artificial satellite just above the earth by T and the density P, then prove that p T

^{-2}is a universal constant.Calculate the value of this constant if G = 6.67 x 10^{-11}N m^{-2}kg

^{-2}41. With what velocity must a body be thrown upward from the surface of the earth so that it reaches a height of 10 R = 6400 km. Mass of earth, M = 6 x 10

^{24}kg and G=6.67 x 10

^{-11}N m^{2}kg^{-2.}42. An artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of escapevelocity from the earth (i) Determine the height of satellite above the earth's surface. (ii) If the satellite is stopped suddenly in its orbit and allowed to fall freely into the earth, find the speed with which it hits the surface of the earth. Take g = 9.8 m s

^{-2}and R_{e}= 6400 km.43. An artificial satellite of mass 200 kg revolves around the earth in an orbit of average radius 6670 km. Calculate its orbital K.E., the gravitational potential energy and the total energy = 6.0 x 10

^{24}kg and G = 6.67 x 10^{-11}N m^{2}kg-2.44. If the distance of the planet jupiterfrom the sun is 5.2 times that of the earth, calculate the period of jupiter's revolution around the sun.

45.The ratio of thetimeperiods of revolution of mars and earth around the sun is 1.88. Find the ratio of the distances of these planets from the sun.

46.Moon describes a circular orbit of radius 4 x 10

^{8}m around the earth in 28 days. Titan desctribes a circular orbit of radius 1.6 x 10^{9}in around the saturn in 16 days. Compare the masses of saturn and the earth.1. State Newton's law of gravitation. Hence define universal gravitational constant. Give thevalue and dimensions of G.

2. Define acceleration due to gravity. Show that the value of 'g' decreases with altitude or height.

3. Discuss the variation of ‘g' with depth. What happens to 'g' at the centre of earth?

4. Write down the formula of gravitational potential energy and obtain from it an expression for

gravitational potential.

5. What do you mean by gravitational potential energy of a body? Obtain an expression for it for

a body of mass m lying at distance r from the centre of the earth.

6. Define the term orbital speed. Establish a relation for orbital speed of a satellite orbiting very

close to the surface of the earth. Find the ratio of this orbital speed and escape speed.

7. What are geostationary satellites? Calculate the height of the orbit above the surface of the

earth in which a satellite, if placed, will appear stationary.

8. State Kepler's law of planetary motion.

9. What is a polar satellite? Explain how does it scan the entire earth in its each revolution? Give

two important uses of a polar. Satellite.

10. What do you mean by the term weightlessness? Explain the state of weightlessness of (i) a freely falling body (ii) an astronaut in a satellite orbiting the earth.

11. Obtain an expression for the acceleration due to gravity on the surface of the earth in terms of mass of the earth and its radius. Discuss the variation of acceleration due to gravity with

altitude and depth.

12. State the conditions necessary for a satellite to appear stationary.

what is 2a and 2b in the first diagram???????

what is escape velocity?obtain the expression for the escape velocity on earth ?find escape velocity on the surface of the earth.

halley's comet has a period of 76 years and in 1986 had a distance of closest approach to the sun equal to 8.9*10^{10}m.the comets farthest distance from the sun is the mass of the sun is 2*10^{30}kg in MKSunits.a)2.7*10^{12}mb(2.7*10^{13}mc)5.3*10^{12}md)5.3*10^{13}m_{1}and r_{2}respectively. The time period of the planet is proportional to:-a) r

_{1}^{3}^{/2}b) r

_{2}^{3}^{/2}c) (r

_{1}+ r_{2})^{3/2}d) (r

_{1}- r_{2})^{3/2 Kindly answer sir/mam.}two point objects of mass 2x and 3x are separated by a distance r . keeping the distance fixed how much mass should be transferred from 3x to 2x so gravitaional force between them becomes maximum

The ratio of kinetic energy of a planet at perigee and apogee during its motion around yhe sun in elliptical orbit of eccentricity is what?

If the acceleration due to gravity at the surface of the earth is g ,the work done in slowly lifting a body of mass m from the earths surface to a height R equal to the radius of the earth is.

a)1/2mgr

b)2mgr

c)mgr

d)none of these

A space vehicle of mass m is in a circular orbit of radius 2R

_{e}about the earth (mass m_{e}). What is the work done by an external agent to transfer it to an orbit of radius 4R_{e}.A 400 KG SATELLITE IS IN A CIRCULAR ORBIT OF RADIUS 2Re ABOUT THE EARTH. HOW MUCH ENERGY IS REQUIRED TO TRANSFER IT TO A CIRCULAR ORBIT AF RADIUS 4Re ? what are the changes in the kinetic energy and potential energyWhat is the another name of Kepler's third law?