Assume you lived on the Moon and noticed the Earth high in the sky. From that location, how often would the Earth set below your horizon?
a. every 24 hours
b. once a sidereal period (27.3 days)
c. once a synodic period (29.5 days)
d. every year
e. never
e
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Current: A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10-19 C)
A. 0.20 B. 20 C. 2.0 D. 3.1 × 1020 E. 31 × 1020
The redshift of galaxies in the Universe is correctly interpreted as:
A: A Doppler shift due to the motions of galaxies through space. B: An "aging" of the light. C: Space itself expanding with time; the photon wavelengths are stretched as they they travel through space. D: The difference in temperature of distant and nearby galaxies. E: Extinction due to the effects of dust in galaxies.
A fish weighing 16 N is weighed using two spring scales, each of negligible weight, as shown in the figure. What will be the readings of the scales?
A) The bottom scale will read 16 N, and the top scale will read zero. B) Each scale will read 16 N. C) The top scale will read 16 N, and the bottom scale will read zero. D) The scales will have different readings, but the sum of the two readings will be 16 N. E) Each scale will read 8 N.
A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected? A) 430 nm and 720 nm B) 450 nm and 740 nm C) 490 nm and 780 nm D) 410 nm and 700 nm E) 470 nm and 760 nm