A 100-W driveway light bulb is on 10 hours per day. If the power company charges 10¢ for each kilowatt-hour of electricity used, estimate the yearly cost to operate the bulb if it is used every day for a 365-day year
A) $3.65
B) $7.30
C) $37
D) $73
C
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In the light curve below, what is the period of the eclipsing binary?
a. 5 days
b. 32.5 days
c. 7.5 days
d. 42.5 days
e. 50 days
Radioactive Decay: Time (days)026111930Counts per Minute1000899726556356200In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?
A. 77 days B. 90 days C. 102 days D. 65 days E. 48 days
Isothermal aging curves in Figure 7.17 show that peak yield strength at aging temperatures of 450°F (232°C) and 500°F (260°C) occurs in times of 100.6 hours (4 hours) and 10-0.6 hours (0.25 hours), respectively. Calculate the activation enthalpy for precipitate formation in this alloy.
What will be an ideal response?
The first living organisms to develop photosynthesis were probably
A) purple and green sulfur bacteria B) trilobites C) cyanobacteria D) stromatolites