A container with a one-liter capacity at 27°C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 105 N/m2.) How many moles of helium does it hold?
A. 0.041
B. 0.081
C. 0.45
D. 0.90
E. 1.0
Answer: B
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Which statement is true about asteroids? a. All asteroids are found in the asteroid belt between Mars and Jupiter. b. Asteroids are also called dwarf planets
c. Asteroids have an irregular shape and are battered by impact cratering. d. All asteroids have bright, reflective surfaces. e. Asteroids originated from older moons.
A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of
A) 5 N. B) 10 N. C) 15 N. D) 20 N.
The relative size of the mantle of Earth compared to the solid inner core of Earth is most similar to
A) the peel of an orange as compared to the meat of the orange. B) the rind of a watermelon as compared to the meat of the watermelon. C) the skin of a grape as compared to the meat of the grape. D) the meat of a peach as compared to the pit of the peach. E) the meat of a cherry as compared to the pit of the cherry.
Which term in the simplified Drake equations depends on sociological factors?
A) NHP B) flife C) fciv D) fnow