Results are out! Find what you need...fast. Get quick advice or join the chat
x

Unlock these great extras with your FREE membership

  • One-on-one advice about results day and Clearing
  • Free access to our personal statement wizard
  • Customise TSR to suit how you want to use it

Temperature question

Announcements Posted on
Rate your uni — help us build a league table based on real student views 19-08-2015
  1. Offline

    ReputationRep:
    A 500g ball of copper at 75ºC is cooled by dropping it into 300g of water at 20ºC. Assuming no heat is lost, what will be the equilibrium temperature?

    For both the ball and water the difference in temperature will be the same right? 75-x=20+x, so x=27.5, so the equilibrium temp would be 47.5?
  2. Offline

    ReputationRep:
    The mass plays a role, you have more of the warmer substance.
  3. Offline

    ReputationRep:
    (Original post by nicatre)
    The mass plays a role, you have more of the warmer substance.
    Sorry I don't get your answer can you explain it in more detail?
  4. Offline

    ReputationRep:
    If the weight and temps are all you are given, then i suppose it would be (Mass of Copper * Temp of Copper)+(Mass of water * Temp of water) All over the combined mass.
  5. Offline

    ReputationRep:
    (Original post by osake)
    Sorry I don't get your answer can you explain it in more detail?
    I think he's saying that the mass of the copper ball should be equated for. For example, It'd cool down quicker if it was 100g instead of 500g.
  6. Offline

    ReputationRep:
    (Original post by Naarim)
    I think he's saying that the mass of the copper ball should be equated for. For example, It'd cool down quicker if it was 100g instead of 500g.
    ah, well see i know that it should be equated for, i tried it yesterday, spent like 30 mins trying and didn't get the answer. Would usually not give up that fast but i cant afford to spend anymore time trying to answer the same question when the physic exams is tomorrow.
  7. Offline

    ReputationRep:
    bump
  8. Offline

    ReputationRep:
    Whats the answer?
  9. Offline

    ReputationRep:
    (Original post by Hazza616)
    Whats the answer?
    says the answer is 27ºC
  10. Offline

    ReputationRep:
    bump
  11. Offline

    ReputationRep:
    At equilibrium Qw = Qc

    as Q = mc(t1-t2)

    m(copper)c(copper)(t1 - T)=m(water)c(water)(T-t2)

    Quite clearly you require the specific heat capacity. Without it this question is impossible.

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 17, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR

Win a mini-fridge

Don't miss our Freshers competition!

Poll
Do you prefer exams or coursework?
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.