Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
teach
pricing
sign-in
Download our FREE mobile app with 1000+ tests for CBSE, JEE MAIN, NEET
X
Search
Topics
Want to ask us a question?
Click here
Browse Questions
Student Questions
Ad
Home
>>
JEEMAIN and AIPMT
>>
Physics
>>
Class11
>>
Gravitation
0
votes
Suppose universal gravitational constant starts to decrease, then
a)length of year will increase b)kinetic energy of earth will increase c)earth will follow spiral path d)all the above
jeemain
physics
class11
unit6
gravitation
q99
medium
Share
asked
Aug 30, 2013
by
meena.p
retagged
Jul 10, 2014
Please
log in
or
register
to add a comment.
Can you answer this question?
Do not ask me again to answer questions
Please
log in
or
register
to answer this question.
1 Answer
0
votes
$T^2= \large\frac{4 \pi ^2}{GM}$$R^3$
$\therefore$ Time period will increase as G decreases.
Kinetic energy $=\large\frac{GMm}{2R}$
Kinetic energy decreases as G decreases
Hence a is the correct answer.
answered
Aug 30, 2013
by
meena.p
edited
Jul 3, 2014
by
lmohan717
T2 = 4R3π2/GM from kepler's law. Thus, T increases with decrease in G, thereby increasing the length of the year.
KE of earth = (1/2)MR2W2 = 2π2MR2/T2. From kepler's law, R3 is proportional to T2 AND hence KE is inversely proportional to T2/3. As G decreases T increases and increase in T decreases the KE.
The radius of the path around the sun is proportional to T3/2. Thus if G decreases, T increases and hence R increases and earth will follow a spiral path
Please
log in
or
register
to add a comment.
Related questions
0
votes
1
answer
If G is the universal gravitational constant and $\rho$ is the uniform density of a spherical planet. Then the shortest possible period of rotation of the planet can be
asked
Aug 30, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q98
medium
0
votes
1
answer
Suppose the gravitational force varies inversely as the n-th power of distance. Then the time period of a planet in circular orbit of radius 'r' around the sun will be proportional to
asked
Aug 24, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q73
medium
0
votes
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
asked
Aug 11, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q21
medium
0
votes
1
answer
The gravitational field due to mass distribution is $ E= k/x^3$ in the x direction where k is a constant. Taking gravitational potential to be zero at infinity, its value at a distance x is
asked
Aug 23, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q61
easy
0
votes
1
answer
A light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and star is proportional to $R^{\large\frac{-5}{2}}$ then $T^2$ is proportional to
asked
Aug 21, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q38
medium
0
votes
1
answer
A mass M is split into two parts m and (M-m) which are then separated by a certain distance. What ratio of m/M maximise the gravitational force between the parts?
asked
Aug 23, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q65
medium
0
votes
1
answer
A satellite of mass m is orbiting the earth at a height 'h' from its surface. If M is Mass of the earth and R its radius then how much energy must be spent to pull the satellite out of the earth's gravitational field?
asked
Aug 22, 2013
by
meena.p
jeemain
physics
class11
unit6
gravitation
q54
easy
Ask Question
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
JEEMAIN
350+ TESTS
NEET
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...