Composite particles that are composed of three quarks are called
A) bosons. B) baryons. C) leptons. D) hadrons. E) mesons.
B
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A scuba diver is 1.2 m beneath the surface of a still pond of water
At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is 1.33. A) 41° B) 48° C) 59° D) 90° E) 0°
What is one piece of scientific evidence for human contributions to global climate change?
A) There is no compelling evidence for human contributions to climate change; the correlations do not show what causes them. B) Humans deplete the ozone layer, allowing more ultraviolet radiation to reach the Earth. C) Humans burn forests, drive cars, and build power plants that directly heat the planet. D) Climate models show that extra carbon dioxide contributed by humans is enough to match the temperature data. E) Humans are responsible for every possible change to the planet, since humans are the only intelligent life forms.
Graphical Interpretation of Work: The net force that an animal exerts on a large piece of fruit it has found is observed and is shown in the graph in the figure. If the force is parallel to the motion of the fruit, how much work did the animal do during the encounter?
A. 12.5 J B. 50 J C. 25 J D. 22 J E. 0 J
A particle moves at a constant speed in a circular path with a radius of 2.06 cm. If the particle makes four revolutions each second, what is the magnitude of its acceleration?
A. 20 m/s2 B. 18 m/s2 C. 13 m/s2 D. 15 m/s2 E. 24 m/s2