A water balloon is dropped from the top of the Physics building. Assume the ball

Question

A water balloon is dropped from the top of the Physics building. Assume the balloon does not break when it strikes the ground. a) Create a particular model for this phenomenon by making an energy-system diagram for the process that takes place from the time the water balloon is dropped until it is motionless on the ground. (Hint: consider the indicators to determine what energy systems must be present/can be excluded. Have you included enough systems?) b) If the water balloon falls a distance of 21 m, what is the maximum temperature rise of the water balloon due to its being dropped? (If your answer does not seem reasonable, check your units.) c) Is there anything in Physics we have discussed so far that prohibits the water balloon from suddenly cooling off to its original temperature and leaping 21 m into the air? From the random nature of thermal energy, can you think of why we never see this happen? Respond briefly.

Explanation / Answer

Given :-

C is the water specific heat, 4180 joules/kg C

H = 21 m

g =9.81 m/s^2

The potential energy becomes heat, Q.
Use the heat to compute the temperature rise.

Delta T = Q/(M*C)

Delta T = (1/2)M g H/(M*C)

Delta T = (1/2)g H/C

Delta T = (0.5 x 9.81 x 21) / 4180

Delta T = 0.0246

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