Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is the sample's specific heat?

  1. Apr 5, 2008 #1
    1. The problem statement, all variables and given/known data
    You are given a sample of metal and asked to determine its specific heat. You weigh the sample and find that its weight is 30.0 N. You carefully add 1.30×10^4 J of heat energy to the sample and find that its temperature rises 20.0 degrees C.

    What is the sample's specific heat?

    2. Relevant equations

    Q=mc (delta)T

    3. The attempt at a solution

    I solved for c giving:


    I converted the given degrees Celsius to Kelvin by adding 273.15, and converted the 30 Newtons to kg by dividing by 9.8 m/s^2. The resulting numbers, 293.15 was used for delta T, and 2.90 kg was used for m.

    This was my resultant value and calculation prior to plug and chug:

    1.30*10^4 J/(2.90 kg*293.15 K)

    Plug and chug gave me 14.71 J/(kg*K). But it's not the correct answer. Could anyone show me what I did wrong?
  2. jcsd
  3. Apr 5, 2008 #2


    User Avatar
    Homework Helper

    293.15 K is not the change in temperature.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook