Water pressure at the bottom of a lake depends on the
A) weight of water in the lake.
B) surface area of the lake.
C) depth of the lake.
D) all of the above
Answer: C
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We know that giant stars are larger in diameter than the sun because
a. they are more luminous but have about the same temperature. b. they are less luminous but have about the same temperature. c. they are hotter but have about the same luminosity. d. they are cooler but have about the same luminosity. e. they have a larger absolute magnitude than the sun.
Carbon-14 Dating: An archaeologist finds the 14C in a sample of 2.10 g of material to be decaying at 107 Bq. A modern 1.00-g sample of the same material decays at 151 Bq,and assume this rate has also held in the past. The half-life of 14C is 5730 years. How old is the sample?
A. 8980 years B. 6230 years C. 17,000 years D. 8530 years
Which living organisms most resemble the common ancestor of all life according to genetic testing?
A) bacteria such as E. coli B) organisms living deep in the oceans around seafloor volcanic vents and in hot springs C) plankton that use sunlight as an energy source through photosynthesis D) viruses E) stromatolites
Light travels at speed c. Complete the following equation using only words: wave speed = _____________ × ________________
Fill in the blank(s) with correct word