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Unit 4 Physics help - Gravitational Fields?

Not really understanding this question, I managed to get a half by putting the equations for gravitational field strengths for both masses equal to each other. ImageUploadedByStudent Room1402349828.408832.jpg

So GM/y^2 = G4M/(d-y)^2

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(edited 9 years ago)
Original post by claudisx
Not really understanding this question, I managed to get a half by putting the equations for gravitational field strengths for both masses equal to each other. ImageUploadedByStudent Room1402349828.408832.jpg

So GM/y^2 = G4M/(d-y)^2

Posted from TSR Mobile


Correct!
Reply 2
Avatar for MrCole
MrCole
The hard bit is done. The next step is to cancel the G and M and rearrange so 4y^2=(d-y)^2. Keep rearranging this until you get it in the form y/d.
Hi im still having problems canceling down to get y/d :frown: help
Original post by MrDomesticCat
Hi im still having problems canceling down to get y/d :frown: help


Hi,

as both sides of equation 4y^2=(d-y)^2 are squared, first step is to square root both sides i.e.

2y = (d-y)

then collect y terms so

2y +y =d

3y =d

divide each side by d

3 (y/d) = 1 (as d/d =1)

divide both sides by 3 to get y/d

y/d =1/3
Original post by starry_n3bula
Hi,

as both sides of equation 4y^2=(d-y)^2 are squared, first step is to square root both sides i.e.

2y = (d-y)

then collect y terms so

2y +y =d

3y =d

divide each side by d

3 (y/d) = 1 (as d/d =1)

divide both sides by 3 to get y/d

y/d =1/3

You are fab! I forgot to collect y terms at the middle stage so was just going in circles :smile: thankyou
Original post by MrDomesticCat
You are fab! I forgot to collect y terms at the middle stage so was just going in circles :smile: thankyou


np ur welcome :smile:

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