From a theoretical standpoint, what is a pulsar?
A) a star that alternately expands and contracts in size
B) a rapidly rotating neutron star
C) a neutron star or black hole that happens to be in a binary system
D) a binary system that happens to be aligned so that one star periodically eclipses the other
E) a star that is burning iron in its core
B
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A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The resistance of the light bulb is 20 ohms
a. True b. False Indicate whether the statement is true or false
Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = (2.00 cm)cos[kx-?t] and the second wave by y2(x,t) = (3.00 cm)sin(kx-?t)
What is the amplitude of the resulting wave? A) 1.00 cm B) 2.50 cm C) 3.61 cm D) 5.00 cm E) 3.94 cm
A photon is quantum of electromagnetic radiation
a. True b. False Indicate whether the statement is true or false
Air moves from
A) a region of low pressure to a region of high pressure. B) a region of high pressure to a region of low pressure. C) a region of stability to a region of instability. D) a cold front to a warm front.