o Verizon 2:13 PM session masteringphysics.com C Physics 220 Problem 5.72 Fricti
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o Verizon 2:13 PM session masteringphysics.com C Physics 220 Problem 5.72 Friction in an Elevator You are riding in an elevator on the way to the eighteenth floor of your dormitory. The elevator's upward acceleration is a 1.98 /ea Beside you is the box containing your new computer box and contents have a total mass of 27.7kE.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 foor is 0.30, what magnitude of force must you apply? Express your answer using two significant figures. Subm My Answers Give Up Incorrect: Ty Again: 4 attempts remainingExplanation / Answer
When the lift is accelerating upwards the apparent weight is greater than the usual
F = m (g+a)
= 27.7 (9.8 + 1.98)
= 27.7 (11.78)
= 326.306 N
This is equal to the normal force acting on the box
The force of friction = K* F
= 0.3 *326.306
= 97.8918 N
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