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Recent questions tagged unit6
Questions
The ratio of kinetic energy required to raise a satellite upto a height 'h' to the kinetic energy of the satellite at that height (R-radius of earth)
jeemain
physics
class11
unit6
gravitation
q30
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
A satellite revolving roung the earth with orbital speed $v_0$, If it stops suddenly, the speed with which it will strike the surface of the earth would be (-ve escape velocity of the particle on earth's surface)
jeemain
physics
class11
unit6
gravitation
q29
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
Two bodies of masses $m_1$ and $m_2$ are initially at rest placed infinite distance apart. They are then allowed to move towards each other under their mutual gravitational attraction. Their relative velocity when they are 'r' distance apart is
jeemain
physics
class11
unit6
gravitation
q28
difficult
asked
Aug 20, 2013
by
meena.p
1
answer
A planet revolves around the sum in an elliptical orbit of eccentricity e.If T is the time period of the planet, then the time spent by the planet between the ends of the planet between the ends of the minor axis close to the sun is
jeemain
physics
class11
unit6
gravitation
q27
medium
asked
Aug 20, 2013
by
meena.p
1
answer
What is the radius of moon's orbit around earth assuming the orbit to be circular ($g=9.8 m/s^2$; Radius of earth =6400 km; period of rotation of moon around the earth $=27.3\; days$
jeemain
physics
class11
unit6
gravitation
q26
medium
asked
Aug 20, 2013
by
meena.p
1
answer
At what velocity in (km/s) should a body be projected horizontally at a height of 30 km from the ground so that it becomes the satellite of the earth? neglect air friction. (radius of earth is $6370 \;Km$)
jeemain
physics
class11
unit6
gravitation
q25
medium
asked
Aug 12, 2013
by
meena.p
1
answer
An object lying at the equator will fly off the surface of the earth , if the speed of rotation of earth increases n time its present value, then n is
jeemain
physics
class11
unit6
gravitation
q24
medium
asked
Aug 12, 2013
by
meena.p
1
answer
The eacape velocity from earth is 11km/s. The escape velocity from a planet having twice the radius and same mean density as that of earth is
jeemain
physics
class11
unit6
gravitation
q23
medium
asked
Aug 12, 2013
by
meena.p
1
answer
A Spherical uniform planet is rotating about its axis . The velocity of a point on its equator is v. Due to the rotation of planet about its axis the acceleration due to gravity of at equator is $\large\frac{1}{2}$ of acceleration due to gravity at poles. The escape velocity of a particle on the poles of planet in terms of v
jeemain
physics
class11
unit6
gravitation
q22
medium
asked
Aug 12, 2013
by
meena.p
1
answer
Suppose the gravitational force varies inversely as the $n^{th}$ power of distance, then the time period of planet in circular orbit of Radius 'R' around the sun will be proportional to
jeemain
physics
class11
unit6
gravitation
q21
medium
asked
Aug 11, 2013
by
meena.p
1
answer
Average density of the earth
jeemain
physics
class11
unit6
gravitation
q20
medium
asked
Aug 11, 2013
by
meena.p
1
answer
A particle of mass 10 g is kept on surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work done against gravitational force between them, to take the particle for away from sphere $(G=6.67 \times 10^{-11} Nm^2/kg)$
jeemain
physics
class11
unit6
gravitation
q19
medium
asked
Aug 10, 2013
by
meena.p
1
answer
Light planet is revolving around a very massive star in a circular orbit of radius 'r' with a period of revolution T. On what power of 't' will the square of period depend if the gravitational force of attraction between planet and the star is proportional to $r^{\large\frac{-5}{2}}$
jeemain
physics
class11
unit6
gravitation
q18
medium
asked
Aug 10, 2013
by
meena.p
1
answer
If the sun is about $9.3\times10^7\; km $ away from the earth, and its mass is $3.24\times10^5 \times m_e$, where $m_e$ is the mass of the earth, how far from the earth must a body be along a line towards the sun so that the sun’s gravitational pull balances the earth's?
jeemain
physics
class11
unit6
gravitation
medium
asked
Aug 10, 2013
by
meena.p
1
answer
Planet Neptune travels around the sun with a period of 165 years. Find the ratio of $\large\frac{R_2}{R_1}$ where $R_2$ radius of Neptune orbit and $R_1$ radius of earth , both being considerd circular.
jeemain
physics
class11
unit6
gravitation
q16
medium
asked
Aug 10, 2013
by
meena.p
1
answer
A rocket is launched with velocity 10 km/s if radius of earth is R, then maximum height attained by it will be
jeemain
physics
class11
unit6
gravitation
q15
easy
asked
Aug 10, 2013
by
meena.p
1
answer
If radius of the earth were to shrink by one percent, its mass remaining same the value of g on the earth's surface would
jeemain
physics
class11
unit6
gravitation
q14
easy
asked
Aug 10, 2013
by
meena.p
1
answer
A simple pendulum has a time period $T_1$ When on earth's surface, and $T_2$ When taken to a height R above the earth's surface, where R is radius of earth. Then $\large\frac{T_2}{T_1}$ is
jeemain
physics
class11
unit6
gravitation
q13
easy
asked
Aug 10, 2013
by
meena.p
1
answer
Two satellites have their masses in the ratio $3:1$ The ratio of the orbit (circular ) are $1:4$ then the ratio of total mechanical energy of A and B
jeemain
physics
class11
unit6
gravitation
q12
easy
asked
Aug 10, 2013
by
meena.p
1
answer
For a planet moving aroung the sun in an elliptical orbit, which of the following quantities remain constant?
jeemain
physics
class11
unit6
gravitation
q11
easy
asked
Aug 9, 2013
by
meena.p
1
answer
Two planets have same average density but their radii are $R_1$ and $R_2$. If acceleration due to gravity on these planets are $g_1$ and $g_2$ respectively.
jeemain
physics
class11
unit6
gravitation
q10
easy
asked
Aug 9, 2013
by
meena.p
1
answer
A planet moves around the sun. At a given point P,it is closet from the sun at a distance $d_1$ and speed $v_1$ At another point Q when it is farthest from the sun at a distance $d_2$, its speed will be
jeemain
physics
class11
unit6
gravitation
q9
easy
asked
Aug 9, 2013
by
meena.p
1
answer
A satellite moves in a circle around earth The radius of this circle is equal to one half of the radius of the moon's orbet. The satellite completes one revolution in
jeemain
physics
class11
unit6
gravitation
q8
easy
asked
Aug 9, 2013
by
meena.p
1
answer
The value of escape velocity on a certain planet is $ 2 km/s$ then the value of arbital speed for a satellite arbiting close to its surface is
jeemain
physics
class11
unit6
gravitation
q7
easy
asked
Aug 9, 2013
by
meena.p
1
answer
Gas escapes from the surface of a planet because it aquires escape velocity. The escape velocity will depend on which of the following <br> 1) Mass of planet <br> 2) Mass of particle escaping <br> 3) Temperature of the planet <br> 4) Radius of the planet
jeemain
physics
class11
unit6
gravitation
q6
easy
asked
Aug 9, 2013
by
meena.p
1
answer
In the gravitational field , at a point where the gravitational potential is zero
jeemain
physics
class11
unit6
gravitation
q5
easy
asked
Aug 9, 2013
by
meena.p
1
answer
The density of a newly discovered planet is twice that of earth . The acceleration due to gravity at the surface of the planet is equal to that at the surface of earth. If the radius of earth is R, radius of planet will be
jeemain
physics
class11
unit6
gravitation
q5
easy
asked
Aug 9, 2013
by
meena.p
1
answer
The angular speed of the earth is doubled , the value of acceleration due to gravitty (g) at north pole
jeemain
physics
class11
unit6
gravitation
q3
easy
asked
Aug 9, 2013
by
meena.p
1
answer
An iron ball and wooden ball of same radius are released from a height 'h' in vacuum. The time taken by both of them to reach ground is
jeemain
physics
class11
unit6
gravitation
q2
easy
asked
Aug 9, 2013
by
meena.p
1
answer
The density of earth increased 4 times and its radius becomes half of what it is , our weight will
jeemain
physics
class11
unit6
gravitation
q1
easy
asked
Aug 9, 2013
by
meena.p
1
answer
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