Tuesday

September 16, 2014

September 16, 2014

Posted by **Lydia** on Thursday, February 21, 2008 at 8:17pm.

I had posted this question several hours ago, and someone gave me such solution:

You need the heat transfer coefficient of styrofoam. It is about .01 watts meters/deg

call area of foam A = .016 m^2

call temperature difference across styrofoam = 35 - 0 = 35 deg C

call thickness of foam t = 2*10^-3 m

then heat gained through foam = (k A/t)((35-0)

heat gain rate watts = (.01*.016/.002)(35)

That watts * time in seconds = Joules

so that times 3600 = Joules gained to melt ice in one hour. Now kg melted = Joules gained/ heat of fusion in Joules/ kilogram

However, I don't quite get the last part, can someone please explain? Thanks!

- physics -
**Damon**, Thursday, February 21, 2008 at 8:24pmwe got the heat gain in watts

watts * time = Joules

(.01*.016/.002)(35) was our watts

so

(.01*.016/.002)(35) Joules/s * 3600 seconds = X * 3.35*10^5 Joules/kg

Solve for X kilograms of ice

**Answer this Question**

**Related Questions**

PHYSICS!!!HELP！！ - At a picnic, a Styrofoam cup contains lemonade ...

physics - At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. ...

Physic - Assume all temperatures to be exact. An aluminum spoon at 84 degree C ...

physics - A 29 g ice cube at 0.0°C is added to 110 g of water in a 62 g iron cup...

math - people flock to andys lemonade stand because each cup of lemonade is only...

Science - Imagine you made a gallon pitcher of lemonade for your family picnic....

Science (Asap) - Imagine you made a gallon pitcher of lemonade for your family ...

physics - A Styrofoam box has a surface area of 0.78 m2 and a wall thickness of ...

physics - A Styrofoam box has a surface area of 0.75 m2 and a wall thickness of ...

MATH - Carolyn and Kim are selling lemonade this summer. It costs $0.10...