Answer to Question #311056 in Classical Mechanics for kay

Question

Before hanging new William Morris wallpaper in her bedroom, Brenda sanded the walls lightly to smooth out some

irregularities on the surface. The sanding block weighs 1.90 N and Brenda pushes on it with a force of 3.00 N at an angle

of 30.0° with respect to the vertical, and angled toward the wall.What is the coefficient of kinetic friction between the wall and the block?

Answer 1

$\vec P+\vec F+\vec F_{fr}=\vec 0,$

$P-F\sin30°=\mu P\cos 30°,$

$\mu=\frac{P-F\sin30°}{P\cos 30°}=0.24.$