What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2
b. 105.7 MeV/c2
c. 1777 MeV/c2
d. none of the above
A
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Why are there two tails to some comets?
A. The "dust tail" is formed by solar radiation pressure. The "gas tail," is pushed out by the solar wind. B. The "gas tail" is formed by solar radiation pressure. The "dust tail," is pushed out by the solar wind. C. Comets contain dense material which is attracted by the Sun's gravity, forming a tail which points toward the Sun. D. The statement is false: comets have only one tail.
In a parallel RLC circuit, where IR = IR, max sin(?t), the current through the capacitor, IC, is
a. IC = ?IC, max sin(?t). b. IC = IC, max sin(?t). c. IC = ?IC, max cos(?t). d. IC = IC, max cos(?t). e. IC = IC, max tan(?t).
In metabolic pathways that are regulated by feedback inhibition, the _____ inhibits the activity of the _____
a. product; first enzyme b. first enzyme; product c. second enzyme; first enzyme d. last enzyme; first enzyme e. reactant; product
The energy radiated from a typical quasar requires that its black hole accrete about:
A) 1 solar mass per 100 years. B) 1 solar mass per 10,000 years. C) 1 Jupiter mass per year. D) 10 solar masses per year. E) 1,000 solar masses per year.