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.

12kg---Unknown--111N--15kg---20kg--222N

After drawing the free-body 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.

222-111 =(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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