Block pull, Problems with trig to isolate for theta.

dimanche 28 juillet 2013

1. The problem statement, all variables and given/known data



What value(s) of θ will result in the block being accelerated 9.0m/s2 to the right?



2. Relevant equations

ƩFx = max

N = mg - P sin(θ)





3. The attempt at a solution

P cos(θ) - μkN = max

P cos(θ) - μk(mg - P sin(θ)) = max

P cos(θ) + μk P sin(θ) = max + μkmg

cos(θ) + μk sin(θ) = (1/P)(max + μkmg)



From here I can't find a trig identity that will help me isolate for theta.






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