You live at a latitude of 73° N. What is the angle between the northern horizon and the north celestial pole?
a. 73°
b. 27°
c. 17°
d. 23.4°
e. 5°
a
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Standing waves are produced by the superposition of two waves with
A. the same amplitude, frequency, and direction of propagation. B. the same amplitude, frequency, and opposite direction of propagation. C. the same amplitude, different frequencies, and opposite direction of propagation. D. the same amplitude, different frequencies, and same direction of propagation.
An AC circuit consists of a 60-Hz source, a 200-W resistor, and a 1.06-H inductor, all in series. What is the impedance of this circuit?
a. 400 W c. 600 W b. 280 W d. 450 W
Hydrogen Balmer lines are strongest near ____ spectral class whereas ionized Calcium (CaII) lines are strong in ___ stars
a. A0, K b. O5, M5 c. M5, G1 d. M0, B0
Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity. b. Mars’ interior would have been warmer in the past. c. Some meteorites from Mars come from relatively young lava. d. All of the above. e. b and c.