Tuesday
September 2, 2014

Homework Help: Physics

Posted by Sara on Friday, November 17, 2006 at 7:25pm.

An ice chest at a beach party contains 12 cans of soda at 3.05 C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C). Someone adds a 7.15-kg watermelon at 25.0 C to the chest. The specific heat capacity of watermelon is nearly the same as that of water. Ignore the specific heat capacity of the chest and determine the final temperature T of the soda and watermelon in degrees Celsius.



heat lost + heat gained = 0
mcdeltaT + mcdeltaT = 0
substitute Tf - Ti for delta T (in both cases). Tf is final T and Ti is initial T. Solve for Tf. Post your work if you get stuck.

Jena: Please dont change names on us. We try to get to know what kind of errors each student is making in order to effectively instruct. Changing names messes that up.

Thanks.

The sum of the heat gains is zero (one will gain heat, the other lose (negative gain)).

0=heatwatermelon gained + heatsodagained
0=masswatermellon*c*(Tf-25) + 12*.35*csoda*(Tf-3.05)

solve for Tf.

(.35)(3800)(Tf-3.05)+(7.15)(4186)(Tf-25)=0
OK but how do I get the Tf for both in the same time

I am Jena's sister
Sorry if I made an error.bobpursley

You haven't multiplied 0.35 kg/can x 12 cans = ?? kg soda.
Just do algebra and the Tf will be the only unknown in the equation.

I am stuck I got a whole different #.


12*0.35*3800*(Tf-3.05) + 7.15*4186*(Tf-25.0)=0
15960Tf - 48678 + 29929.9Tf - 748247.5 = 0
Solve for Tf. I assume you can take it from here.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - An ice chest at a beach party contains 12 cans of soda at 4.16 C. ...
Physics - An ice chest at a beach party contains 12 cans of soda at 2.45 C. ...
geometry - In exercises 31-34, a cooler at a picnic contains 100 cans of soda ...
Physics - A con of soda displaces 3.79 * 10^-4 m^3 of water when completely ...
4 grade math - the estimate the number of cans of soda thet drink each week? ...
English - e.g. I have a soda to recommend. ( What is 'soda'? Are both Coke and ...
Microeconomics: Budjet Constraint - You have decided to eat sushi for lunch and ...
Statistics - Cola Corporation produces Orange Cola. The filling machines are ...
Statistics - Cola Corporation produces Orange Cola. The filling machines are ...
Physics - A uniform soda can of mass0.135kg is12.4cm tall and filled with1....

Search
Members