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Chapter 19: Q. 77 (page 547)
10 g of aluminum at 200掳C and 20 g of copper are dropped into 50 cm3 of ethyl alcohol at 15掳C. The temperature quickly comes to 25掳C. What was the initial temperature of the copper?
The initial temperature is
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The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5.
a. What is the specific heat ratio g?
b. By what factor does the temperature increase?
0.10 mol of nitrogen gas follow the two processes shown in
Figure EX19.31. How much heat is required for each?
A rapidly spinning paddle wheel raises the temperature of 200 mL of water from 21掳C to 25掳C. How much
(a) heat is transferred and
(b) work is done in this process?
of nitrogen gas follow the two processes shown in FIGURE P19.58. How much heat is required for each?
A typical nuclear reactor generates 1000 MW (1000 MJ/s) of electrical energy. In doing so, it produces 2000 MW of 鈥渨aste heat鈥� that must be removed from the reactor to keep it from melting down. Many reactors are sited next to large bodies of water so that they can use the water for cooling. Consider a reactor where the intake water is at 18掳C. State regulations limit the temperature of the output water to 30掳C so as not to harm aquatic organisms. How many liters of cooling water have to be pumped through the reactor each minute?
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