Sphere rolling down a ramp problem

  • Thread starter iamtrojan3
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  • #1
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Homework Statement


A solid sphere of uniform density (weight = 3.2 lbs starts from rest and rolls down a ramp (H = 1.57 m, q = 18.3°.)

Find the speed of the sphere's CM when it reaches the bottom of the ramp.

haha sorry bout that....

Homework Equations



see below

The Attempt at a Solution


i dont' know whats wrong with my set up here,
m*g*d*sin(theta) = .5mv^2 + (2/5)(.5)mv^2

any help?

thanks!
 
Last edited:

Answers and Replies

  • #2
jgens
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It might help if we knew what the question was!
 
  • #3
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Ops... forgot to add the question. silly me >.<
 
  • #4
jgens
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Your conservation of energy equation looks wonky. If I'm doing this right, you should have that m*g*h = (0.5)mv2 + (2/5)*(0.5)mv2. You're already given the height of the ramp!
 
  • #5
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i hate when they put extra information in it, you just feel obligated to use it.

yes your right, thanks alot for the help!
 
  • #6
jgens
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You're welcome! :)
 

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