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Inclined plane

  • Thread starter cugirl
  • Start date
  • #1
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Homework Statement



A block (starting from rest) with mass m = 4.5 kg slides down a frictionless incline a distance of d = 3m and then slides across a horizontal floor with friction (the coefficient of friction is Fk = 0.52). The speed of the block at the bottom of the incline is v1 = 7m/s. What is the angle of the incline? (Assume the acceleration was constant.)

Homework Equations


v initial = 0
mgsin(mu) - ƒk = ma

The Attempt at a Solution


I am wondering if I am approaching this correctly.
mgsin(theta) - ƒk = ma
 
Last edited:

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,090
4

Homework Statement



A block (starting from rest) with mass m = 4.5 kg slides down a frictionless incline a distance of d = 3m and then slides across a horizontal floor with friction (the coefficient of friction is Fk = 0.52). The speed of the block at the bottom of the incline is v1 = 7m/s. What is the angle of the incline? (Assume the acceleration was constant.)

Homework Equations


v initial = 0
mgsin(mu) - ƒk = ma

The Attempt at a Solution


I am wondering if I am approaching this correctly.
mgsin(mu) - ƒk = ma
I hope you mean mgsinθ.

I would be concerned if you were trying to plug in μ, usually used for the coefficient of friction, as the angle.
 
  • #3
17
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sorry -- that's what I meant. All the greek letters -- uggh.
 
  • #4
LowlyPion
Homework Helper
3,090
4
As to the problem, the equation you have doesn't address the basic acceleration down the incline, if your statement of the problem is correct in saying the incline is frictionless.
 

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