When a comet passes near the Sun, part of it takes on the appearance of a large, bright ball from which the tail extends. This part is called
A) the nucleus.
B) the coma.
C) the plasma tail.
D) the Oort core.
B
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Some species of whales can dive to depths of one kilometer. What is the total pressure they experience at this depth? (?sea = 1 020 kg/m3 and 1.01 × 105 N/m2 = 1 atm.)
A. 9.00 atm B. 90.0 atm C. 100 atm D. 111 atm E. 130 atm
A pressure of 20 kPa is applied to one piston in a simple hydraulic device, the pressure on a piston of larger area will be
A) less than 20 kPa. B) the same 20 kPa. C) more than 20 kPa. D) all of the above E) none of the above
Which of the following is a unit of energy:
a. watt b. ft—lb/sec c. newton/sec. d. horsepower e. joule
By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years old. What is the age of the sedimentary rock?
A) 1.4 million years B) no older than 1.4 million years C) no younger than 1.4 million years D) Radiometric dating does not work for sedimentary rocks.