A 5-g lead bullet traveling in 20 C air at 300m/s strikes a flat steel plate and stops. What is the final temp of the lead bullet? (Assume bullet retains all heat.) The melting point of lead is 327 C. The specific heat of lead is 0.128 J/g C. The heat of fusion of lead is 24.5 J/g.(adsbygoogle = window.adsbygoogle || []).push({});

a. 227 C b. 260 C c. 293 C d. 327 C

I thought I would be able to solve this by taking the KE + c*m*delta T=0, but it's not working. I'm also not sure how to figure out if the bullet melts or not. I tried that above along with adding the latent heat of fusion for lead*mass, but that's not working either.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: What is the final temp of the lead bullet?

**Physics Forums | Science Articles, Homework Help, Discussion**