A cool, thin gas produces absorption lines
Indicate whether the statement is true or false
TRUE
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During one day and night in the mid-northern hemisphere, the stars near the north celestial pole
a. rise in the east. b. set in the west. c. circle the north celestial pole counter-clockwise. d. circle the north celestial pole clockwise.
According to current understanding of physics, how empty is "empty" space?
A) Even empty space is teeming with "virtual particles" that we cannot directly detect. B) It is completely empty; there is literally nothing in empty space. C) Empty space will produce a black hole due to the uncertainty principle. D) Empty space is constantly creating new fundamental particles that we can detect easily.
Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the net force on the 5.0 nC charge?
A) 3.0 × 10-6 N B) 4.5 × 10-6 N C) 5.4 × 10-6 N D) 7.2 × 10-6 N E) 9.0 × 10-6 N
The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10^6 m. What is the mass of planet Nutron?
a. 6.2 × 10^28 kg b. 5.0 × 10^28 kg c. 5.5 × 10^28 kg d. 4.3 × 10^28 kg e. 3.7 × 10^28 kg