- #1
km41
- 7
- 0
Homework Statement
There is a system consisting of two masses, m1=20 kg, m2=30kg on a pulley and m2 is 2 meters above the ground, while m1 is on the ground.
This is the question: the system released from rest a 30 kg block that is 2m above a ledge. The pulley is a disk with radius of 10 cm and a mass of 5 kg.
a) Find the speed of the 30 kg block before it hits the ledge.
b) Find the angular speed of the pulley at that time.
c) Find the tensions in the strings.
Homework Equations
I'm going to assume: Initial=Final
1. KE(rotational)+KE (linear)+ PE= KE(rotational)+KE (linear)+ PE
2. KE= (1/2)Inertia x (Omega Squared)
3. Inertia= Mass x (Radius Squared)
4. Velocity (linear)= radius x omega
I can't think of any other, but there probably is
The Attempt at a Solution
a. I think I have to use the first equation, The KER cancels out and the KE (linear) is out leaving only the PE. I can't really figure it out from there?