• Support PF! Buy your school textbooks, materials and every day products Here!

Questions on Heat (tricky)

  • Thread starter klng
  • Start date
22
0
1. Homework Statement
Jack took two glass bottles containing water at 20 degC and wrapped them separately in washcloths. One of the washcloths was wet and the other was dry. Twenty minutes later, she measured the water temperature in each bottle. The water in the bottle with the wet washcloth was 18 degC, while the water in the bottle with the dry wash-cloth was 22degC. The most likely room temperature during this experiment was:


2. Homework Equations
Choose one of the following options:
a) 26 degC
b) 21 degC
c) 20 degC
d) 18 degC


3. The Attempt at a Solution

My predicted ans: 26 deg C. Heat has to go from a hotter environment to a cooler environment (i.e. 20 degC) to make one of the bottles (i.e. wrapped in dry cloth) attain a moderate temp of 22 deg C. For the one wraped in wet cloth, my guess is that water in the cloth is cooler than 20 deg C. Hence this wet wash cloth will absorb heat both from the environment, and the water, facilitated by water's high heat capacity.

Opinions on my reasoning?
1. Homework Statement



2. Homework Equations



3. The Attempt at a Solution
 

rl.bhat

Homework Helper
4,433
5
Your reasoning is correct.
 
22
0
Thanks.
 

Related Threads for: Questions on Heat (tricky)

  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
0
Views
1K
Replies
0
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
1
Views
659
  • Last Post
Replies
2
Views
3K
Top