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Inclined Plane Problem-- Solving for Theta

  1. Jun 24, 2016 #1
    1. The problem statement, all variables and given/known data
    These two problems are inclined plane problems which I cannot figure out. The problems are attached in the image below.

    2. Relevant equations
    Fnet=ma

    3. The attempt at a solution
    I first broke down the gravity force into its x and y components. After that, I did this:
    mgsinx-F(kinetic friction)=ma

    and found the expression for normal force: N=mgcosx

    then found the expression for F(kinetic friction): mgcosxµk

    I tried plugging in the expression for kinetic friction:

    mgsinx-mgcosx(µk)=ma

    I wasn't able to find an answer using this method so now I have no clue how to proceed.
     

    Attached Files:

  2. jcsd
  3. Jun 24, 2016 #2
    The important part of the question says (the print is too small for my eyes) the angle is adjusted so that the block has a constant speed of (can't read it) call it v.

    Assume your equation is correct, what is the acceleration if the velocity is constant?
     
  4. Jun 24, 2016 #3
    Oh I see, I completely overlooked that-- I mistook the velocity for acceleration. I'll rework this with a=0 and see if I can figure it out. Thanks!
     
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