You are riding in an elevator on the way to the eighteenth floor of your dormito

Question

You are riding in an elevator on the way to the eighteenth floor of your dormitory. The elevator's upward acceleration is a = 1.84 m/s2 . Beside you is the box containing your new computer; box and contents have a total mass of 28.1 kg . While the elevator is accelerating upward, you push horizontally on the box to slide it at constant speed toward the elevator door. If the coefficient of kinetic friction between the box and elevator floor is mu k = 0.30, what magnitude of force must you apply? Express your answer using two significant figures.

Explanation / Answer

normal force on block = m*(g + a) = 28.1*(9.8+1.84) = 327N Friction force = uN = 0.3*327 = 98.13 N = Force applied

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