- #1
Terraist
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Homework Statement
The 1.92 kg physics book shown is connected by a string to a 450.0 g coffee cup. The book is given a push up the slope and released with a speed of 2.58 m/s. The coefficients of friction are μs = 0.457 and μk = 0.166. What is the acceleration of the book if the slope is inclined at 21.2°?
Homework Equations
f=ma
c is cup
b is book
The Attempt at a Solution
Alright I've tried pretty much goddamn everything (including a solution from a textbook) and I still get the wrong answer. Here's the best I can do.
f = ma
-mcg - uk(mbg cos x) - mbg sin x = -ma
a ={0.450(9.8) + 0.166 (18.8 cos 21.2) + 18.8 sin 21.2}/ (1.92 + 0.450)
a = 5.96 m/s2 Wrong!
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