Galileo observed which of the following phases of Venus?
A) full
B) new
C) crescent
D) gibbous
E) all of the above
E
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The bright O and B tracers make the spiral arms of galaxies, including ours, appear to be _____
A) yellow B) blue C) orange D) red
Who discovered the period-luminosity relationship, and why was it so critical?
What will be an ideal response?
After a ball tossed upward leaves your hand, the force of gravity on it
A) no longer acts. B) gradually diminishes. C) gradually increases. D) remains constant. E) changes direction.
Intensity: An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter. What is the maximum value of the magnetic field in the laser beam? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 9.24 µT B. 17.2 µT C. 12.4 µT D. 20.5 µT E. 15.4 µT