Posted by Jenn on Thursday, October 18, 2007 at 10:29pm.
Four penguins are being pulled along very slippery (frictionless) ice by a curator. The masses of the three penguins are given below and so are two of the tensions. Find the penguin mass that is not given.
12kgUnknown111N15kg20kg222N
After drawing the freebody force diagrams, I was lost.

Physics  bobpursley, Friday, October 19, 2007 at 6:54am
Write the equations
F=ma
222=(20 + 15 + 12 + M)a
111= (12+M)a
so solve it, two unknowns, two equations. However, it is not that hard. There is another equation.
222111 =(15+20)a so solve for A here, then solve for M from above.

Physics  Jenn, Tuesday, October 23, 2007 at 10:02pm
thank you so much! I think I just overcomplicated the problem. thank you for making it much easier!
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