Which of the following conditions makes stars appear dim?
A) The scattering of light by the dust in clouds
B) The luminosity of the neighboring star
C) The increasing mass of all the stars
D) The gravitational force from the planets
A
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A. Primary B. Subsidiary C. Contextual D. Adaptive
Which of the following is not a nonmetal?
A) titanium (atomic no. = 22) B) sulfur (atomic no. = 16) C) selenium (atomic no. = 34) D) xenon (atomic no. = 54) E) helium (atomic no. = 2)
While analyzing the currents within a circuit containing multiple components (such as batteries, resistors, etc.), which of the following statements concerning currents flowing into a single junction must be true?
a) The sum of the currents entering the junction must equal the total current through the battery. b) The sum of the currents entering the junction must equal zero. c) The sum of the currents entering the junction must equal the sum of the currents exiting the junction. d) The currents entering the junction must follow only one of the possible exit paths. e) The currents entering the junction may exit back along the path from which they entered
A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.