Molecular Speeds: If an ideal gas molecule has a speed of 0.50 km/s at 20°C, what is its speed at 80°C?
A. 500 m/s
B. 550 m/s
C. 1000 m/s
D. 2000 m/s
Answer: B
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If the net force acting on an object doubles, then the ________ doubles as well.
A. velocity B. speed C. acceleration D. mass
Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming negligible air resistance?
A) at least 3.0 cm B) at least 4.9 cm C) at least 6.8 cm D) at least 9.8 cm
Two identical arrows, one with twice the kinetic energy of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates
A) the same distance. B) twice as far. C) four times as far. D) more than four times as far. E) none of the above
Which of the following is not consistent with recent observations of the cosmic microwave background by Planckt?
A) The universe is geometrically "flat" (in the four dimensions of spacetime). B) The matter density (both luminous and dark matter combined) in the universe is only about one-fourth of the critical density. C) Dark energy, whatever it is, represents the majority of the energy content of the universe. D) The universe is at least 20 billion years old.