A 2.00-kg block of ice is at STP (0°C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 × 10^5 J/kg)
a. zero
c. 1220 J/K
b. 584 J/K
d. 2450 J/K
D
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A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
A. 15 m/s B. 49 m/s C. 30 m/s D. 42 m/s E. 36 m/s
A comet that has a semi-major axis of 100 AU must have a period of about
A. 20 years. B. 100 years. C. 1,000 years. D. 10 years.
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above
Why does the plasma tail of a comet always point away from the Sun?
A) It is allergic to sunlight. B) Gases from the comet, heated by the Sun, push the tail away from the Sun. C) Radiation pressure from the Sun's light pushes the ions away. D) The conservation of the angular momentum of the tail keeps it always pointing away from the Sun. E) The solar wind blows the plasma ions directly away from the Sun.