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buffalo buffalo
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11 years ago
A student weighing 400 N stands on a laboratory scale in a moving elevator. At this time, the reading on the scale is 350 N. What inference can be made about the motion of the elevator?
Select one:
a. The elevator is accelerating upward.
b. The elevator is accelerating downward.
c. The elevator is moving with constant velocity upward.
d. The elevator is moving with constant velocity downward.
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datasian Author
wrote...
#1
11 years ago
C.

If the reading on the scale is 350, then the elevator is colliding with the force of the students weight with 50 newtons. The weight obviously goes downwards, so the elevator has to be going upwards. If it were accelerating upward, then that would mean the reading on the scale would continue to decrease. So it has to be moving at a constant velocity upward.
wrote...
#2
11 years ago
b. If the elevator was accelerating downward at 32.2 feet per second per second = 9.8 meters per sec per sec, the elevator and the passengers would be in free fall and the scale would read zero N. At slightly higher acceleration downward; the passengers would hit their heads on the ceiling of the elevator.   Neil
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