How does the prevailing model for activity explain the hot ejected gas seen in active galaxies?
A. It is energy released as matter is funneled into a black hole.
B. It is gas evaporating from an accretion disk around a massive black hole.
C. It is shot out of a black hole.
D. It is material trapped between two orbiting black holes being gravitationally scattered.
E. It is a rip in space-time from which Hawking radiation is released.
Answer: B
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A heat engine has an efficiency of 35.0% and its power output is 600 W. What is the rate of heat input?
A. 1.8 kW. B. 2.0 kW. C. 2.4 kW. D. 3.0 kW.
Two plane mirrors make an angle of with each other. A light ray enters the system and is reflected once off of each mirror. Through what angle is the ray turned?
A) 60° B) 90° C) 120° D) 150°
O3 and O2 are the two ______________ of the element oxygen
Fill in the blank(s) with correct word
Series/Parallel Circuits: A 4.0-? resistor is connected with a 12-? resistor and this combination is connected across an ideal dc power supply with V = 6.0 V, as shown in the figure. When a total current I flows from the power supply, what is the current through the 12-? resistor?
A. 1.5 A B. 2.0 A C. 2.5 A D. 3.0 A E. 0.50 A