Use Coupon: CART40 and get 40% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list


A double star,with two star masses m1 & m2.They are rotating with constant angular speed. If max. distance of separation between them is R,find the angular speed of star in terms of m1,m2 & R

3 years ago


Answers : (1)


Hi Shweta

The above ques will be done with the concept of reduced mass...

according to the concept of reduced mass when two bodies rotate about their common centre of mass such that a force of attraction acts between them and the dist.b/n the 2 bodies remains constant then their angular velocites are exactly same both in magnitude and direction .the results for angular velocity and time period that u obtain for single bodies can be obtained by using the reduced mass of  2 body system .To reduce the 2-body system to 1-body just consider 1 body of mass=m(reduced mass) and consider its rotation about a fixed point at a dist=dist between the 2 bodies.thus u get a simple circular motin whose radius is known and the centrifugal force is balanced by the force of attraction that was originally present between the bodies. 

we can consider the 2-star system to be as 1 star having a mass
(m1+m2) this will rotate in circular motion about a fixed pt. and having radius equal to the separation b/n the 2 bodies and the force remaining the same towards the centre as b4 which in this case is the gravitation force of interaction.

the equations will be

mw2R=Gm1m2/R2.   solving u get w=(1/R)(G(m1+m2)/R) ie 1/R*root(G(m1+m2)/R)


Hope it helps!

3 years ago

Post Your Answer

sir,i want to know how many rounds are there in IITs this year for councilling?
There will be 2 rounds of JEE COUNSLING THIS YR.
Charchit Tailong 4 months ago
Generally two to three rounds are there and if some seats are left vacant then fourth or subsequently spot round is conducted, the most deserving candidates get through in first two or at...
Soneel Verma 4 months ago
already 3 rounds are done,how can there be 2 rounds?
Ayush Saxena 4 months ago
What is the best book for concepts in physics?
you can get the solutions of HC Verma book on this youtube channel named “Omega Open Course”
Sundar Chacha 2 months ago
hc verma best physics concept book really ive tried it just blindly follow it
purva gupta 3 months ago
sir, i’am vivek kumar, completed 12 class . can prepared IIT JEE ADVANCED EXAM
For sure yes, but mind you, it requires a lot of hard work and sincerest efforts, keep in mind these guidelines –Stay focused on your studies and keep in mind that one must focus on...
Ayushmaan Vardhan 4 months ago
yes but only if ur 11 th 12 th base is strong otherwise please do not take risk of 1 year iit advanced is not too easy it is the 6 th toughest exam of the planet ….….….….….... PLEASE ........
Gayatri Jayesh Bondriya 4 months ago
im expecting 469 marks in aipmtt.will i get seay?general category.
Oh god i don’t know what’s wrong the answers aren’t getting posted. I’m from jharkhand and jharkhand has only 3 colleges :P so you know if a person gets a seat with a rank in 10,000s you...
Neeti 4 months ago
As it is, it’s practically impossible for general category students to get a seat, that too in MBBS. It’s like we’re born with a curse. :/ i dropped a year and appeared this year for aipmt...
Neeti 4 months ago
See chances are always high in state quota. But you can never be too sure you know. because it depends largely on how others have performed. But it’s ok to be hopeful, but don’t just sit...
Neeti 3 months ago
The Maximum area of the triangle formed by the complex coordinates z 1 , z 2 , z 3 which satisfy the relations I z - z 1 I = I z - z 2 I , I z- (z 1 +z 2 ) / 2 I I ??? 2 – z 1 I z
Hi, The first equation says that z lies on perpendicular bisector of line joining z1 and z2. But your second equation is not visible. Please write complete equation with proper sign to get...
Yash Baheti one year ago
Dear vardaan You can post your question here in discussion forom .and you will get detail solution here by AskIITians Experts. But if you want to join online doubt removal clases then you...
Badiuddin askIITians.ismu Expert 5 years ago
Respected sir/madam,Ihave just passed 10 and is now in class 11.I have taken PCM in choice of subjects .i have the doubts in chemistry which are as follows:a)firstly ,please tell me the way...
varun singh 2 years ago
View all Questions »
More Questions On IIT JEE Entrance Exam

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details