# Atwood Machine Tensional Value Problem HELP!

by naganalf
Tags: acceleration, atwood, physics, pulley, tension
 P: 1 1. A pulley with mass Mp and a radius Rp is attached to the ceiling, in a gravity field of 9.81 m/s^2 and rotates with no friction about its pivot. Mass M2 is larger than mass m1. The quantities Tn and g are magnitudes. A) T3 is ..... T1 + T2 B) T1 is ..... m1g. C) The C.M. of Mp+m1+M2 does not accelerate. D) T3 is ..... m1g + M2g + Mpg. E) T2 is ..... T1 F) The magnitude of the acceleration of m1 is ..... that of M2. I have not included a diagram, but this seems to be a standard Atwood machine. First of all, using Fnet = ma, for each mass, I found that: T2 = M2g - M2a, T1 = m1a + m1g T3 (the tensional force holding the pulley to the ceiling) = M2g + m1g + Mpg Using this knowledge, I determined that: A) T3 > T1 + T2 B) T1 > m1g C) True (because the pulley itself is not accelerating) D) T3 = m1g + M2g + Mpg (I have a feeling this might be where I went wrong) E) T2 > T1 (I wasn't sure about this one either, chose it because M2 is greater) F) The magnitude of the acceleration of m1 is = that of M2 This is my last question of an assignment due in only two hours, and I'm completely stumped. Any help is greatly appreciated. Thanks! EDIT*** figured it out - C is false and D is < sorry

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