Examples of gravitational fields [IB Physics HL]

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Комментарии
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Perfectly explained. Got my final exam in 25 days and had no idea about topic 10 until I watched the videos. Thank you so much! You are the absolute goat

sakshamgrover
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Hey Mitch, thank you for these videos. I did have a doubt however, on the first question. At 6:01 when you plug in the value of delta Vg into the W=m*delta Vg equation, wouldn't delta Vg equal to 12 (20-8, the difference in the gravitational potential)? I thought of it this way since it is the **change** in the gravitational potential (20 J kg^-1 from infinity away versus 8 J kg^-1 from infinity away). Please let me know why this is incorrect. Thank you.

firebreathmint
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Hey Mitch, for the first question, I tried solving it differently which made lots of sense to me but I am getting the wrong answer. I equated Vg=-GM/r and solved for M (mass of earth in this instance) as I was given Vg and r (20Jkg and 50m respectively). With the mass I then solved for the gravitational potential difference for the second mass: Vg = -GM/20. Finally, with the newly found potential I then multiplied it by mass (3.5kg) to figure out the work done (W = m*Vg). How come this is not a valid approach?

upsyndrome