Thursday
May 5, 2016

# Homework Help: physics help please :)

Posted by Christina on Sunday, December 2, 2007 at 11:10pm.

From a height of 35.0 m, a 1.25 kg bird dives (from rest) into a small fish tank containing 50.0 kg of water.

What is the maximum rise in temperature of the water if the bird gives it all of its mechanical energy?

(delta)T= ?? degrees C
• physics help please :) - drwls, Sunday, December 2, 2007 at 11:49pm

First compute the mechanical energy that is converted to heat, Q.

Q = (1/2) M g H
H = 35 m
g = 9.8 m/s^2
M = 1.25 kg. Q will be in Joules if you use these units. Divide the number of Joules by 4.18 to get calories

To get the delta T, use
Q = M(water) * C * (delta T)
C = 1.00*10^3 calories/kg C

• physics help please :) - Christina, Monday, December 3, 2007 at 11:25am

I'm not getting the correct answer.. this is my work:

Q=214.374/4.18 =51.286

51.286=(50)(10^3)T
T=.001

Do I need to convert the T to something else? It says to have it in C, which I think it's already in...