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.
12kgUnknown111N15kg20kg222N
After drawing the freebody force diagrams, I was lost.

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. 
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 
thank you so much! I think I just overcomplicated the problem. thank you for making it much easier!
Respond to this Question
Similar Questions

physics
Three bolocks are connected(mass_1 on the left connected to mass_2 with a string which is T_1. Mass_2 is connected to Mass_3 with a string, T_2. the force is holding on to T_3 which is connected to mass_3) and pulled to the right on … 
Penguins
Which species of Penguins is the largest? 
S.A.T Math
At Central Park Zoo,the ratio of sea lions to penguins is 4 to 11. If there are 84 more penguins than sea lions, how many sea lions are there? 
Science: Physics and Chemistry
I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched to the other 2 masses. It has no Fn, … 
Science: Physics and Chemistry
Can someone please help me with this??? I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched 
physics
which two object have masses 20kg and 15kg are placed on a plane surface.Both have same area.Which one is the correct answer for pressure. 1)20kg mass least pressure 2)15kg mass least pressure 3)20kg mass most pressure 4)both have … 
maths exponential functions
I have a maths assignment and i need help with this question my teacher is overseas at the moment and it is due when he gets back The Population P, of penguins in a certain region of Antarctica can be modeled by the relation P=Po (2) … 
physics help needed very urgent !!!
The figure shows four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of three penguins and the tension in two of the cords are m1 = 10.5 kg, m3 = 14.7 kg, m4 = 22.05 kg, T2 … 
physics
Four penguins are being pulled alone by a handler. THe masses of the three penguins and the tension in the two of the cords are M1 =14kg, m2=26kg, m4=23kg, T2=115N, and T4=320N. Find the acceleration of the system and b) the mass of … 
physics
The figure here shows four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of three penguins and the tension in two of the cords are m1 = 12 kg, m3 = 16 kg, m4 = 21 kg, T2 = …