A charge of uniform volume density (40 nC/m3) fills a cube with 8.0-cm edges. What is the total electric flux through the surface of this cube?
a. 2.9 N / m2/C
b. 2.0 N / m2/C
c. 2.6 N / m2/C
d. 2.3 N / m2/C
e. 1.8 N / m2/C
d
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Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be
a. less than 3 solar masses. b. more than 3 solar masses. c. between 0.4 and 1.4 solar masses. d. less than 0.4 solar masses. e. not larger than the masses of the stars that we can see.
A gallon container is filled with gasoline. How many gallons are lost if the temperature increases by 25°F? (The volume expansion of gasoline is 9.6 × 10^?4 (°C)?1.) (Neglect the change in volume of the container.)
a. 2.4 × 10^?2 b. 1.3 × 10^?2 c. 3.6 × 10^?2 d. 4.8 × 10^?2 e. 9.6 × 10^?2
Most of the hot, young blue stars lie in the ________ of our Galaxy
A) bulge B) globular clusters C) central bar D) spiral arms E) halo
In addition to its weight, what force is needed to lift a wire ring of radius 2.0 cm from the surface of blood plasma? The surface tension of blood plasma is 7.3 × 10^¯2 N/m
a. 1.8E+1 N b. 3.7E–2 N c. 9.2E–3 N d. 1.8E–2 N