Roller Coaster Problem Please Help

  • Thread starter alexcc17
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  • #1
alexcc17
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Homework Statement



http://img684.imageshack.us/img684/4316/capturerey.jpg [Broken]

Homework Equations





The Attempt at a Solution


I am completely stuck on this. I thought I would use W=F=ma, but that wouldn't take the height into account. Any help would be greatly appreciated
 
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Answers and Replies

  • #2
Nessdude14
172
2
To find the velocity at the second peak, you can use conservation of energy:

[itex]\displaystyle ΔU_g = mgΔh[/itex]
Ug is potential gravitational energy

[itex]\displaystyle K_E = -ΔU_g = \frac{1}{2} mv^2[/itex]


And to find the apparent weight of the passenger, you can use the circular motion equation:

[itex]\displaystyle F_{net} = \frac{mv^2}{r}[/itex]

Hope that helps.
 
  • #3
PhanthomJay
Science Advisor
Homework Helper
Gold Member
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513
Yikes the heights are in meters but the weight is given in pounds. No wonder why they stopped teaching mixed units in the States. Watch your unit conversions, please.
 
  • #4
alexcc17
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Thank you!
 

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