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

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