Gravitational potential energy (GPE) (1 Viewer)

trecex1

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How's it a waste of time?
Why don't you just think about the questions before posting? You look at what you have and what you want and see which equation(s) to use. There's a reason why people who don't do maths/general can still do HSC physics - there are no tricks involved in calculations. Maybe self learning isn't working out so well?
 

eyeseeyou

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r=2.5x10^6m + the altitude given

If we rearrange the ΔGPE formula we get E(p)=Gm1m2(1/r(i) - 1/r(f))
1x10^7=Gm1m2(1/(2.6x10^6) - 1/(2.7x10^6))
∴Gm1m2=7.02x10^14
Now we calculate the ΔGPE for the fall by subbing in Gm1m2 as 7.02x10^14
∴ΔGPE=7.02x10^14(1/(2.7x10^6) - 1/(2.66x10^6))
∴ΔGPE=-4.9x10^6 J
What?
 

eyeseeyou

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r=2.5x10^6m + the altitude given

If we rearrange the ΔGPE formula we get E(p)=Gm1m2(1/r(i) - 1/r(f))
∴1x10^7=Gm1m2(1/(2.6x10^6) - 1/(2.7x10^6))
∴Gm1m2=7.02x10^14
Now we calculate the ΔGPE for the fall by subbing in Gm1m2 as 7.02x10^14
∴ΔGPE=7.02x10^14(1/(2.7x10^6) - 1/(2.66x10^6))
∴ΔGPE=-4.9x10^6 J
Why'd u switch the numbers around?
 

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