During an adiabatic compression, a volume of air decreases to 1/4 its original size. Calculate its final pressure if its original pressure was 1 atm. (Assume the air behaves like an ideal gas with ? = 1.4.)
A. 7.0 atm
B. 5.6 atm
C. 3.5 atm
D. 2.2 atm
E. 0.14 atm
Answer: A
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When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)
A) The elevator is moving downward at a constant rate. B) The elevator is accelerating upward at a constant rate. C) The elevator is accelerating downward at a constant rate. D) The elevator is moving upward at a constant rate. E) From the given information, we cannot tell if the elevator is moving up or down.
An atom is ionized if one of its electrons jumps to a higher energy level in the atom
a. True b. False Indicate whether the statement is true or false
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A) 0 g. B) g downward. C) g upward. D) g upward, then g downward. E) none of the above
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A) low mass. B) intermediate mass. C) high mass. D) zero-age main sequence. E) blue stragglers.