Outdoor decay of objects is a chemical reaction. Some ancient objects have been preserved extremely well in Arctic conditions. As glaciers have melted,
archaeologists have discovered 4,000-year-old Viking clothing.
Clarissa left her wool sweater outside at her family's summer cottage in
Florida. When she returned the following summer, the sweater was shreds.
decayed by reactions that break down wool.
Based on the data in the table, what can you conclude about the rate at which
clothing decays in cold temperatures compared with the rate at which
clothing decays in warm temperatures?
Object
Location
Decay time
Average
temperature
27F
Woolen tunic
Arctic Norway
4,000 years
Woolen sweater
Tropical Florida
70'F
1 to 2 years
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Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)