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PHY-121 HW#3 October 16, 2018 Problem1 A 1500-kg car is traveling with a speed of 50.0mph. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0m? Problem2 Thedrawingshowsbox1restingonatable, withbox2restingontopofbox1. Amasslessrope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1= 50.0N, W2= 35.0N, and W3= 20.0N. Determine the magnitude of the normal force that the table exerts on box 1. Figure 1: Credit: WileyPlus Problem3 A woman stands on a scale in a moving elevator. Her mass is 55.0kg, and the combined mass of the elevator and scale is an additional 810kg. Starting from rest, the elevator accelerates 1 upward. During the acceleration, the hoisting cable applies a force of 9410N. What does the scale read during the acceleration? ...
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PHY-121 HW#3
October 16, 2018

Problem1
A 1500-kg car is traveling with a speed of 50.0mph. What is the magnitude of the
horizontal net force that is required to bring the car to a halt in a distance of 50.0m?
F= ma
50 mph= 22.35 m/s
S= 0.5(U+V)T
50=0.5(22.35)T
T= 4.47 Seconds
A= -22.35/4.47
=5
F= mass*Acceler...

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