What is the mass of air in a room that measures 5.0 m × 8.0 m × 3.0 m? (The density of air is 1/800 that of water)
150 kg
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A toy rocket, of mass 60 g, achieves a velocity of 80 m/s after 3.0 s when fired straight up. What average thrust force does the rocket engine exert?
A) 3.4 N B) 1.2 N C) 2.2 N D) 3.3 N E) 1.6 N
Tycho Brahe's extremely accurate measurements of the planetary positions showed that
A) Kepler's theory was wrong. B) both Ptolemy's theory and Copernicus's theory were correct. C) both Ptolemy's theory and Copernicus's theory were wrong. D) Copernicus's theory was wrong and Ptolemy's was correct. E) Ptolemy's theory was wrong and Copernicus's theory was correct.
The size and sign of the charge on an electron is the same as that for:
a. an antiproton. c. an antineutron. b. a positron. d. an antineutrino.
Life forms in the Precambrian included
A) trilobites. B) brachiopods. C) coelacanths. D) cyanobacteria.