# Physics

posted by Jenn

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.

1. bobpursley

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.

2. Nikki Baker

1. Which of the following is not an example of an energy transfer?
1. A roller coaster being pulled to the top of the first hill
2. A roller coaster standing still allowing people to get on
3. A roller coaster falling down a hill
4. A roller coaster coming to a stop at the end of ride

3. Jenn

thank you so much! I think I just overcomplicated the problem. thank you for making it much easier!

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