Friday

April 18, 2014

April 18, 2014

Posted by **Lydia** on Thursday, February 21, 2008 at 5:44pm.

Please give some hints to do it!Thanks!

- PHYSICS!!!HELP！！ -
**Damon**, Thursday, February 21, 2008 at 6:18pmYou 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

- PHYSICS!!!HELP！！ -
**Damon**, Thursday, February 21, 2008 at 6:20pmBy the way, I think heat of fusion is about 3.33 * 10^5 Joules/kg. You have a typo.

- PHYSICS!!!HELP！！ -
**Lydia**, Thursday, February 21, 2008 at 7:09pmI don't really get the last part...so that times 3600 = Joules gained to melt ice in one hour. Now kg melted = Joules gained/ heat of fusion in Joules/ kilogram

Please explain.

- PHYSICS!!!HELP！！ -
**Damon**, Thursday, February 21, 2008 at 9:23pm(.01*.016/.002)(35)joules/s *3600 s = X kg ice * 3.33*10^5 Joules/kg ice melt

**Related Questions**

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

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

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

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

Math (ASAP) - Carolyn and Kim are selling lemonade this summer. *It ...

Math - Carolyn and Kim are selling lemonade this summer. It costs 10 cents to ...

physics - A 240 g ice cube at -10 C is placed in an aluminum cup whose initial ...

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

Physics - Take two Styrofoam cups, partially fill them with equal amounts of ...