2. A car has a mass of 400 kg. The car is on a scale, which is on a freight elev
ID: 2303567 • Letter: 2
Question
2. A car has a mass of 400 kg. The car is on a scale, which is on a freight elevator. For each situation, what will be the reading on the scale in kN? a. The elevator is moving upward with a constant velocity of 8 m/s. g b. The elevator is moving downward at 8 m/s and accelerating at 0.5 g. The elevator is moving upward at 8 m/s and accelerating at 0.5 g. The elevator is moving downward at 8 m/s and decelerating at 0.5 g. The elevator is moving upward at 8 m/s and decelerating at 0.5 g. c. d. scale e.Explanation / Answer
A)
when the elevator is moving with constant velocity a = 0
reading R = 400*9.8= 3.92 KN
B)
accelerating at 0.5g
reading R = mg-ma
= 400*9.8-400*0.5*9.8
= 1.96 KN
C)
elevator is moving upward at 0.5 g
reading R = mg+ma
= 400*9.8+400*0.5*9.8
= 5.88 KN
d)
decelerating a = -0.5g
reading R = mg-ma
= 400*9.8+400*0.5*9.8
= 5.88 KN
e)
Deccelerating a = 0.5g
reading R = mg+ma
= 400*9.8-400*0.5*9.8
= 1.96KN
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