A silly question

  • Thread starter kurtlau
  • Start date
  • #1
5
0
A waterfall is 100m high and the temperature of the water at the top is 12℃.Assume that all the kinetic energy of the water reaching the bootom is changed into internal energy. Find the temperature of water at the bottom of the waterfall.
I don't know how to calculate~ Help me please and expaining particularly~ Thank you!
 

Answers and Replies

  • #2
Doc Al
Mentor
44,990
1,263
kurtlau said:
A waterfall is 100m high and the temperature of the water at the top is 12℃.Assume that all the kinetic energy of the water reaching the bootom is changed into internal energy. Find the temperature of water at the bottom of the waterfall.
I don't know how to calculate~ Help me please and expaining particularly~ Thank you!
At the top, the water has gravitational PE = mgh (with respect to the bottom). That PE transforms into KE as it falls. Finally, the KE is transformed into thermal energy. ΔKE = mcΔt, where c is the specific heat of water (look it up!).
 

Related Threads on A silly question

  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
2
Replies
26
Views
3K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
7
Views
4K
Replies
11
Views
3K
Replies
1
Views
2K
Replies
5
Views
2K
  • Last Post
Replies
1
Views
17K
Replies
4
Views
10K
Top