If the Sun passes almost in front of the center of our Milky Way Galaxy, it does so
A) once a year. B) once a day.
C) only in 2012, at the end of the Mayan calendar. D) once a month.
A
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The deuterium in distant quasars and in the interstellar medium suggests that the universe is open
Indicate whether the statement is true or false
Capacitors in Combination: Two capacitors are connected as shown in the figure, with C1 = 4.0 µF and C2 = 7.0 µF. If a voltage source V = 90 V is applied across the combination, find the potential difference across C1.
A. 57 V B. 36 V C. 60 V D. 9.0 V
Atomic Nucleus: The symbol for a certain isotope of radium is 
Ra. How many nucleons are there in the nucleus of this isotope?
A. 88 B. 138 C. 214 D. 226 E. 314
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south