
#1
Sep2611, 09:03 PM

P: 98

1. The problem statement, all variables and given/known data
Three masses m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2 kg hang from three identical springs in a motionless elevator. the elevator is moving downward with a velocity of v = 2.3 m/s but accelerating upward with an acceleration of a = 4.8 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.) What is the force the bottom spring exerts on the bottom mass? 2. Relevant equations f=kx 3. The attempt at a solution Some of my confusion lies with k. Since k is a constant is it the same value as if the elevator was motionless or does k change when the elevator moves? 



#2
Sep2611, 11:59 PM

P: 688





#3
Sep2711, 07:12 PM

P: 98

Still not sure how to solve this I guess




#4
Sep2711, 07:33 PM

P: 2,568

Spring in moving elevator!
Draw your FreeBody Diagram first.




#5
Sep2711, 08:31 PM

Emeritus
Sci Advisor
HW Helper
PF Gold
P: 7,418

How is it this possible "... a motionless elevator. the elevator is moving " ?
Follow flyingpig's advice !!! 



#6
Sep2711, 08:36 PM

HW Helper
P: 2,316




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