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magnitude of the acceleration of the crates. 85. You are helping a friend move, and you need to load a \( 2.65 \times 10^{2} \mathrm{~kg} \) box of books. You slide the box up a ramp, which has an incline of \( 30.0^{\circ} \) and a coefficient of static friction of 0.45 . You apply the force on the box at an angle of \( 39.0^{\circ} \) with respect to the ramp. (2.4) (a) Calculate the minimum force needed to slide the box up the ramp. (b) Now you want to stop halfway up the ramp. What coefficient of static friction must exist between the box and the ramp for the box to stay in place? 86. An elevator accelerfites upward in 3.4 s to a final

          magnitude of the acceleration of the crates.
85. You are helping a friend move, and you need to load a \( 2.65 \times 10^{2} \mathrm{~kg} \) box of books. You slide the box up a ramp, which has an incline of \( 30.0^{\circ} \) and a coefficient of static friction of 0.45 . You apply the force on the box at an angle of \( 39.0^{\circ} \) with respect to the ramp. (2.4)
(a) Calculate the minimum force needed to slide the box up the ramp.
(b) Now you want to stop halfway up the ramp. What coefficient of static friction must exist between the box and the ramp for the box to stay in place?
86. An elevator accelerfites upward in 3.4 s to a final

magnitude of the acceleration of the crates.
85. You are helping a friend move, and you need to load a 2.65 × 10^2 kg box of books. You slide the box up a ramp, which has an incline of 30.0^∘ and a coefficient of static friction of 0.45 . You apply the force on the box at an angle of 39.0^∘ with respect to the ramp. (2.4)
(a) Calculate the minimum force needed to slide the box up the ramp.
(b) Now you want to stop halfway up the ramp. What coefficient of static friction must exist between the box and the ramp for the box to stay in place?
86. An elevator accelerfites upward in 3.4 s to a final

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