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Earth/Space Science V19, Rebecca de la Lastra (4932/S)
Question 7 (Worth 2 points)
Which of the following types of stars started out on the main sequence with the largest initial mass?
Graph A
Graph B
Graph C
Graph D
Intensity --
I
Intensity --
Intensity -
IT
100 350 600 850 1,100
Wavelength (A)
100 350 600 850 1,100
Wavelength (Á)
100 350 600 850 1,100
Wavelength (Á)
100 350 600 850 1,100
Wavelength (A)
OA

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

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)

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.