A single mass (m 1 = 3.4 kg) hangs from a spring in a motionless elevator. The s

Question

A single mass (m1 = 3.4 kg) hangs from a spring in a motionless elevator. The spring constant is k = 274 N/m.

Now, three masses (m1 = 3.4 kg, m2 = 10.2 kg and m3 = 6.8) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above.

Now the elevator is moving downward with a velocity of v = -3.9 m/s but accelerating upward at an acceleration of a = 5.1 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)

Finally, the elevator is moving downward with a velocity of v = -3 m/s but accelerating downward at an acceleration of a = -2 m/s2.

1) What is the magnitude of the net force on the middle mass?

*** I got 20060 as an answer, but it tells me "It appears you have made a power of ten error."

Explanation / Answer

1.

The magnituude of net force on the middle mass is

F2=m2(g-a)=10.2*(9.8-2)

F2=79.56 N

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