Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    I need help on this question, I will attach a link to the screenshot:
    http://prntscr.com/akpown

    I thought of using Newton's law of gravitation, given by F = GMm/r^2
    However in the question they've provided us with the radius which the satellite orbits relative to the surface of the Earth; therefore should I add the radius of the Earth with the radius of the orbit?
    So what I mean is:

    F = (6.67*10^-11)(5.98*10^24 KG)(2.5*10^3 KG) /
    (1.6*10^7 + 6.4*10^6)^2

    Giving me a value of 1987N?
    Offline

    1
    ReputationRep:
    Hi,
    Yeah I think the radius of the Earth needs to be added- when I worked it out I got roughly 1990 N
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by lharrisonx)
    Hi,
    Yeah I think the radius of the Earth needs to be added- when I worked it out I got roughly 1990 N
    Thanks for the response, however I went ahead and looked at the answer and they did not consider the radius of the Earth in the calculation and had gotten a value of 3910N, could they potentially be incorrect?

    This is where I found it:
    http://www.physbot.co.uk/uploads/1/2...ity_aqa_ms.pdf

    If you scroll down to page 13/16 on the PDF viewer.
    Offline

    18
    ReputationRep:
    No you do not add the radius of earth.

    Think about "an orbit of radius xxx". What does that actually mean?

    It means it moves in a circular path (key word there being radius). So if it's moving in a circular path around the earth, then they must have already taken in to account the radius of earth.



    Also this is incorrect
    (Original post by 1017bsquad)
    However in the question they've provided us with the radius which the satellite orbits relative to the surface of the Earth
    It's not relative to the surface because it's already a radius
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Student403)
    No you do not add the radius of earth.

    Think about "an orbit of radius xxx". What does that actually mean?

    It means it moves in a circular path (key word there being radius). So if it's moving in a circular path around the earth, then they must have already taken in to account the radius of earth.



    Also this is incorrect


    It's not relative to the surface because it's already a radius
    Ahh I see now, thanks for clarifying, I should really pay attention next time, thanks though I appreciate it!
    Offline

    18
    ReputationRep:
    (Original post by 1017bsquad)
    Ahh I see now, thanks for clarifying, I should really pay attention next time, thanks though I appreciate it!
    Most welcome
    Offline

    1
    ReputationRep:
    Oops, I really need to read questions more carefully Sorry!
 
 
 
Poll
Could you cope without Wifi?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Groups associated with this forum:

View associated groups

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.