1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Heat problems

  1. Jun 24, 2010 #1
    1. The problem statement, all variables and given/known data
    A 54.0 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 327 g of water, initially at 19.4°C. What is the final temperature of the water, if no heat is transferred to the Styrofoam or the surroundings?

    2. Relevant equations
    mc(delta)T+mc(delta)T = 0
    Given- L=3.35e5
    C(water) = 4190

    3. The attempt at a solution

    First i tried,
    mc(delta)T+mc(delta)T = 0


    then i tried...
    mL+mc(delta)T+mc(delta)T = 0


    both solve for Temp of course.
    and both are wrong.... help???!!!
  2. jcsd
  3. Jun 24, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Your second method is correct, since heat is required to melt the ice.

    If you share your answer with the rest of us, we could tell you if you are at least close to the correct answer, and it's maybe a roundoff or significant figures problem. Or that you are way off and made an arithmetic mistake.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook