Which of these could be considered as "hot dark matter"?
A) deuterium
B) weakly interacting magnetic particles (WIMPS)
C) neutrinos
D) dust close to H II regions
E) dark energy
C
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Complete the following statement: The sum of the magnitudes of the currents directed into a junction
a) equals the sum of the magnitudes of the currents directed out of the junction. b) is less than the total current directed out of the junction. c) equals the current that is directed along one of the lines out of the junction. d) is divided equally among the number of lines directed out of the junction. e) is greater than the total current directed out of the junction.
A black hole is an object whose escape velocity is equal to ________
Fill in the blank(s) with correct word
For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A) $0.22. B) $0.55. C) $2.20. D) $5.50. E) none of the above
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00