When is the Sun directly overhead at noon in the continental United States?
a. March 21
b. June 21
c. July 21
d. never
Answer: d. never
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One of the most remarkable discoveries by biologists over recent decades is that life can
A) survive in an astonishing variety of environments B) only exist in a very narrow range of environments C) only exist under conditions that exist on Earth D) survive in any and every environment, however harsh
A person drops a brick from the top of a building. The height of the building is 400 m and the mass of the brick is 2.00 kg. What will be the speed of the brick right before it touches the ground? Use g = 10.0 m/s2
A) 10.0 m/s B) 13.2 m/s C) 89.4 m/s D) 59.4 m/s E) 63.2 m/s
Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. C) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. D) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.