The energy radiated by a typical quasar requires that its black hole accrete about
A) one solar mass a year.
B) ten solar masses a year.
C) one solar mass a day.
D) one solar mass a decade.
E) one solar mass a century.
B
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Power: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 3.1 min, what is the average power delivered by the child?
A. 17 W B. 21 W C. 22 W D. 26 W
The most abundant element in Earth's core is ________.
A. iron B. hydrogen C. oxygen D. nitrogen
The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm c. 456 nm b. 273 nm d. 122 nm
Why Bode's law was never considered a law of physics?
a. Because it is not testable. b. Because it is not consistent. c. Because it turned out not to be true. d. Because it had no scientific basis. e. Because it wasn't invented by Bode.