Pendulum Conservation of Energy

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  • #26
PeroK
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L minus cos(theta)L

Where are you getting ##\theta_{max}## from?
 
  • #27
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Where are you getting ##\theta_{max}## from?
Theta is usually given, it differs from problem to problem
 
  • #28
PeroK
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Theta is usually given, it differs from problem to problem

You need to post a problem. Show your calculations and we can see where you are going wrong. You seem to understand everything so I don't know what it could be!
 
  • #29
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You need to post a problem. Show your calculations and we can see where you are going wrong. You seem to understand everything so I don't know what it could be!
thanks. yeah it seems like i've been making some algebra mistakes. just seemed so unlikely by the amount of problems i've tried. But experience tells me there is no limit to dumb mistakes.

I'll try again tomorrow (I don't have the books with me here) and post if i continue to get it wrong.

Thank you very much, so sorry for being difficult!
 
  • #30
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it seems like i've been making some algebra mistakes. just seemed so unlikely by the amount of problems i've tried.
That's exactly when they start happening again -- and in the parts that one is very confident of and doesn't think about enough.
 
  • #31
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You need to post a problem. Show your calculations and we can see where you are going wrong. You seem to understand everything so I don't know what it could be!
Hi, so I tried again. I think I'm using the calculator wrong.
When I use √2gΔh = v that still doesn't work out.
But if I use a correct value for v, square it and divide it by 2 I get gΔh. So mgΔh is 1/2mv2 after all. I'm so relieved. Sorry for the trouble. And thank you all for helping me!
 
  • #32
haruspex
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Hi, so I tried again. I think I'm using the calculator wrong.
When I use √2gΔh = v that still doesn't work out.
But if I use a correct value for v, square it and divide it by 2 I get gΔh. So mgΔh is 1/2mv2 after all. I'm so relieved. Sorry for the trouble. And thank you all for helping me!
Sounds like you need to enter it as √(2gΔh).
 

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