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Physics Predictions/Thoughts (1 Viewer)

Goldattacker40000

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Would we need to be able to explain the Zeeman effect if we had to state limitations of Bohr's model?
 
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When you are calculating the energy required to move a satellite higher in orbit do you use the change in GPE or change in total energy way?
 

Goldattacker40000

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When you are calculating the energy required to move a satellite higher in orbit do you use the change in GPE or change in total energy way?
Total energy way I think cause GPE way just tells you how much GPE it gained and doesn't account for the net decrease in kinetic energy of the satellite too.
 

Goldattacker40000

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how do u do total energy way again?
I don't think the formula is given in the formula sheet but it's the E=-GMm/2r formula for total energy. Just find the initial value of E using the initial orbital radius given and subtract it from the final value of E using the new orbital radius given.
 

carrotsss

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When you are calculating the energy required to move a satellite higher in orbit do you use the change in GPE or change in total energy way?
if you're moving it into a new circular orbit then its the change in total energy, if its just moved up (and will fall into an elliptical orbit) then its just the change in GPE. 99% of the time its asking for the first one though
 

Rattlehead15

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if you're moving it into a new circular orbit then its the change in total energy, if its just moved up (and will fall into an elliptical orbit) then its just the change in GPE. 99% of the time its asking for the first one though
What is change in total energy?
 

Trippzy

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if you're moving it into a new circular orbit then its the change in total energy, if its just moved up (and will fall into an elliptical orbit) then its just the change in GPE. 99% of the time its asking for the first one though
wait I always thought they ask for change in GPE. do u have a question which highlights the first part I haven't ever seen in the use for 1/2U
 

Goldattacker40000

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what would r be in this case?
The initial value of r would be 6800km and the final value of r would be 42000km, you jusy multiply the denominator of the expression for U by 2 as the total energy of the satellite is given by E=1/2(U). Make sure to convert the values of r to meters
 

Trippzy

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The initial value of r would be 6800km and the final value of r would be 42000km, you jusy multiply the denominator of the expression for U by 2 as the total energy of the satellite is given by E=1/2(U). Make sure to convert the values of r to meters
so what do I sub in for r in U? 6800km or 42000km ☠
 

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