A single mass (m1Â = 4 kg) hangs from a spring in a motionless elevator. The spring constant is k = 335 N/m.1)
What is the distance the spring is stretched from its unstretched length?
cm
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Your submissions:
Â
2)
Now, three masses (m1Â = 4 kg, m2Â = 12 kg and m3Â = 8) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above. What is the magnitude of the force the bottom spring exerts on the lower mass?
N
Â
Your submissions:
Â
3)
What is the distance the middle spring is stretched from its equilibrium length?
cm
Â
Your submissions:
Â
4)
Now the elevator is moving downward with a velocity of v = -3.8 m/s but accelerating upward at an acceleration of a = 5.5 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.) What is the magnitude of the force the upper spring exerts on the upper mass?
N
Â
Your submissions:
Â
5)
What is the distance the lower spring is extended from its unstretched length?
cm
Â
Your submissions:
Â
6)
Finally, the elevator is moving downward with a velocity of v = -2.1 m/s but accelerating downward at an acceleration of a = -1.7 m/s2. Compare the magnitude of the NET force on each mass:
F1Â = F2Â = F3
F1Â > F2Â > F3
F2Â > F3Â > F1
Â
Your submissions:
Â
7)
What is the magnitude of the net force on the middle mass?
Answers
Status NEW
Posted 17 Jun 2017 01:06 AM
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