…theta degrees, the coefficient of static friction c for the book is given by cp cos theta = p sin theta. Solve the equation for c and find the value of c when theta = 15 degrees.

c p cos theta = p sin theta therefore

c = sin theta/ cos theta

c= sin 15/cos 15 = 0.258/0.966

c = 0.267

Answer: c= 0.267

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