1. Not finding help here? Sign up for a free 30min 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!

Time from Joules and Watts

  1. Oct 5, 2007 #1
    An ice cube is placed in a microwave oven. Suppose the oven delivers 104 W of power to the ice cube and that it takes 32165 J to melt it. How long does it take for the ice cube to melt?


    Following my lecture notes and my textbook ... the formula should be t=(J/W), but that isn't giving me the correct answer. Therefore I assume I am missing a step, can anyone help?
     
  2. jcsd
  3. Oct 5, 2007 #2

    Avodyne

    User Avatar
    Science Advisor

    What answer did you get?
     
  4. Oct 6, 2007 #3
    I am getting an answer of 309.3s using your equation which seems correct to me...

    1 Watt = 1 J/s so 104Watts=104J/s

    Then dividing the energy used to melt the ice by the power output of the microwave.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Time from Joules and Watts
Loading...