Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    I keep getting this question wrong and I have been at it for two days

    The gravitational force on a satelite of mass m at a distance r from the centre of the Earth is 4.0 x10^14 (m/r^2) . Assuming that the Earth is a sphere of radius 6.4x10^3 km, find the period of revolution ( in hours) of a satelite moving in a circular orbit at a height of 3.6x10^4 km above the Earths surface.

    answer is 24.1 hours any ideas on the calculation ?? much appreciated.
    Offline

    11
    ReputationRep:
    (Original post by coco739)
    I keep getting this question wrong and I have been at it for two days

    The gravitational force on a satelite of mass m at a distance r from the centre of the Earth is 4.0 x10^14 (m/r^2) . Assuming that the Earth is a sphere of radius 6.4x10^3 km, find the period of revolution ( in hours) of a satelite moving in a circular orbit at a height of 3.6x10^4 km above the Earths surface.

    answer is 24.1 hours any ideas on the calculation ?? much appreciated.
    F=mg=mrw^2 w=\sqrt\frac{g}{r}
    T=2\pi\sqrt\frac{r}{g}
    Offline

    13
    ReputationRep:
    (Original post by coco739)
    I know w^2r is acceleration and m is the mass but what is the extra w ?
    typo
    Offline

    11
    ReputationRep:
    (Original post by coco739)
    I know w^2r is acceleration and m is the mass but what is the extra w ?
    Sorry typo
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: September 30, 2011

University open days

  • University of East Anglia
    UEA Mini Open Day Undergraduate
    Fri, 23 Nov '18
  • Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 23 Nov '18
  • Edge Hill University
    All Faculties Undergraduate
    Sat, 24 Nov '18
Poll
Black Friday: Yay or Nay?

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.