In the text is a photograph that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time
B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster
C) a large galaxy with four central masses that glow brightly
D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots
B
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Indicate whether the statement is true or false
RLC Circuits: As shown in the figure, an ac source whose rms voltage is 80 V is in series with a 100-? resistor and a capacitor whose reactance is 200 ? at the frequency of the source. What is the rms voltage across the capacitor?
A. 66 V B. 68 V C. 70 V D. 72 V E. 74 V
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
A. 2.0 × 104 J. B. 2.5 × 104 J. C. 1.7 × 103 J. D. 1.5 × 103 J. E. 4.0 × 104 J.
An object is held at a distance of 18 cm from a convex mirror creating an image that is 1/6 the object size. What is the focal length of the mirror?
a. -3.6 cm c. -6.0 cm b. -18 cm d. -9.0 cm