Water at the top of Niagara Falls has a temperature of11.0°C. If it falls a dist
ID: 1669850 • Letter: W
Question
Water at the top of Niagara Falls has a temperature of11.0°C. If it falls a distance of40.0 m and all of its potential energygoes into heating the water, calculate theincrease in temperature of the water at the bottomof the falls. °C A 40.0 g piece of cadmium is at15°C. If 415 cal of energy is added to the cadmium, what isits final temperature?1°C Water at the top of Niagara Falls has a temperature of11.0°C. If it falls a distance of40.0 m and all of its potential energygoes into heating the water, calculate theincrease in temperature of the water at the bottomof the falls. °C A 40.0 g piece of cadmium is at15°C. If 415 cal of energy is added to the cadmium, what isits final temperature?
1°C
Explanation / Answer
Height h = 40 m
Heat energy = change in potential energy
Q = mgh
= 392 m
Initial temp of the water t = 11 oC
We know Q = mC dt
From this change in temperature dt = Q / mC
= 392 / C
Where C = specific heat of water = 4186 J / kg oC
So, dt = 0.0936 oC
(b). Mass of the cadmium M = 40 g
Initial temperature t = 15 oC
Energy added Q = 415 cal
We know Q = mC dt
From this raise in temperature dt = Q / mC
Where C = specific heat of cadmium
Som, final temperature t ‘ = t + dt
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