Turn on thread page Beta

Velocity of two masses under their own gravitational influence watch

    • Thread Starter
    Offline

    0
    ReputationRep:
    Two rigid objects in outer space, with masses 5.0 kg and 8.0 kg are observed from an inertial reference frame to be released at rest at a very large seperation. Assuming that only the mutual gravitational attraction is important, determine the speed of each object when the centre of masses of the two object is seperated by 3.0 m.

    The answers are 1.48*10^-5 and 9.24*10^-6 m/s.

    Can someone help me with this please, I know it's a question involving conservation of energy but I don't know where to start...
    • Thread Starter
    Offline

    0
    ReputationRep:
    bump
    Offline

    9
    ReputationRep:
    Also need conservation of momentum
    Offline

    10
    ReputationRep:
    (Original post by KeyFingot)
    Two rigid objects in outer space, with masses 5.0 kg and 8.0 kg are observed from an inertial reference frame to be released at rest at a very large seperation. Assuming that only the mutual gravitational attraction is important, determine the speed of each object when the centre of masses of the two object is seperated by 3.0 m.

    The answers are 1.48*10^-5 and 9.24*10^-6 m/s.

    Can someone help me with this please, I know it's a question involving conservation of energy but I don't know where to start...
    Try conservation of momentum and conservation of energy together
    remember
     F = \frac{GM_1M_2}{d^2}
    and  work = \displaystyle\int F \ dx
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks guys
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: January 5, 2013

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
Poll
How are you feeling in the run-up to Results Day 2018?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.