Buoyancy: A steel ball sinks in water but floats in a pool of mercury, which is much denser than water. Where is the buoyant force on the ball greater?
A. floating on the mercury
B. submerged in the water
C. It is the same in both cases.
D. It cannot be determined from the information given.
Answer: A
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The star Wolf 359 is 7.7 light years away. What is that distance in kilometers?
a. 7.7 x 10^8 km b. 14 x 10^13 km c. 0.78 x 10^8 km d. 7.28 x 10^13 km e. 7.28 x 10^12 km
When a living cell doubles in diameter, it has eight times the mass to be nourished, and the amount of membrane through which it feeds is
A) only twice as much. B) only four times as much. C) also eight times as much. D) more than eight times as much.
The Greek approach to understanding the universe relied mostly on
A) observations B) experiments C) thought and intuition D) preconceived ideas
Which of the following statements is true of green grass?
A) It absorbs red light and emits green light. B) It absorbs red light and reflects green light. C) It transmits all colors of light except green. D) It means the lawn is healthy.