Thermodynamics, energy, momentum

[MozAngeles]

Homework Statement

An 8.3 g bullet traveling at 360m/s embedded itself in a 2.0 kg pendulum bob. The length of the bob is 2.0 m.
a. What is the maximum angle the pendulum swings up?
b. If the bob and the bullet are both made of lead, by how much does their temperature raise?

Homework Equations

m₁v₁=m₂v₂
P_i=P_f
Q=c_Pbm$$\Delta$$T

The Attempt at a Solution

I got the right answer for part a. which is 19.3 degrees.
But for part b. I am stumped. I know that since this is an completely inelastic, energy is lost in the collision. So I'm not sure where to go from here

 

[tiny-tim]

Hi MozAngeles!

(have a delta: ∆ and a degree: ° )

I got the right answer for part a. which is 19.3 degrees.
But for part b. I am stumped. I know that since this is an completely inelastic, energy is lost in the collision. So I'm not sure where to go from here

You know how much energy (strictly, mechanical energy ) was "lost" in the collision …

ok, assume that all that "lost" energy went into heat!

 

[MozAngeles]

i figured it out thanks :)