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A single mass (m1 = 4.4 kg) hangs from a spring in a motionless elevator. The spring constant is k = 275 N/m.
Now, three masses (m1 = 4.4 kg, m2 = 13.2 kg and m3 = 8.8) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above.
Finally, the elevator is moving downward with a velocity of v = -2.1 m/s but accelerating downward at an acceleration of a = -2.1 m/s2.
What is the magnitude of the net force on the middle mass?

Respuesta :

Answer:

magnitude of force on the middle mass 129.36 N

Explanation:

Given data:

m_1 = 4.4 kg

spring constant =  275 N/m

m_2 = 13.2 kg

m_3 = 8.8 kg

downward velocity = -2.1 m/s

acceleration of elevator = - 2.1 m/s^2

magnitude of force on the middle mass is calculated as[tex]force = mass \times acceleration\ due\ to\ gravity[/tex]

for middle mass m  is =  13.2 kg

[tex]force  = 13.2\times 9.8 = 129.36 N[/tex]

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