You drive your car at a constant 60 km/h along the highway. You apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to
A) momentarily regain its higher initial speed.
B) continue moving at 40 km/h.
C) decrease in speed if no other forces act.
Answer: B
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What best explains the darkness of the rings beyond Saturn's?
A) Water ice reflects light poorly at the low temperatures beyond Saturn. B) Old, sooty debris and radiation darkening. C) Rocky debris doesn't reflect as well as water ice. D) They are pieces of captured comets. E) The sunlight is much fainter out there.
How many unique quantum states correspond to the lowest possible energy level of an electron in the hydrogen atom?
A) 3 B) 0 C) 1 D) 4 E) 2
The metric prefix that means one thousand is milli-
Indicate whether the statement is true or false
Significant Figures: Add 1299 g and 45.1 kg and express your answer in milligrams (mg) to the correct number of significant figures.
A. 4.64 × 107 mg B. 4.64 × 104 mg C. 4.64 × 105 mg D. 4.64 × 106 mg