If you are in the Moon's umbral shadow, then you will witness:
A) nighttime.
B) a total solar eclipse.
C) a total lunar eclipse.
D) a partial solar eclipse.
E) some kind of lunar eclipse.
B
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An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy?
(melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)
A neon light (thin hot neon gas in a sealed tube) gives us:
A) a continuous spectrum, since the neon is hot enough to glow. B) a few bright emission lines, telling us the gas is neon. C) a continuum, with dark lines identifying the neon atoms that are present. D) a lot of random bright red lines due to the motion of the hot atoms. E) nothing visible to us, but a lot of infrared lines as heat.
Giant molecular cloud complexes are located in spiral arms
Indicate whether the statement is true or false
Relative to the stars, the moon moves about _________ eastward in the sky each night
a. 1° b. 5° c. 13° d. 27.3° e. 29.5°