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.
D
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Why do neutrons make better nuclear probes than alpha particles?
a. Neutrons are more massive than alpha particles. b. A neutron has less mass than an alpha particle. c. Neutrons are not subject to the strong force. d. Neutrons have about the same mass as a proton. e. Neutrons have no electrical charge.
The rate of evaporation over the very salty Mediterranean is
A) less than the rate of precipitation. B) greater than the rate of precipitation. C) equal to the rate of precipitation. D) greater than the influx of fresh water from streams and rivers.
The diagram below illustrates a portion of the model for the universe described by
a.
Kepler.
b.
Tycho.
c.
Ptolemy.
d.
Copernicus.
e.
Galileo.
Is it possible for speed to be constant while acceleration is not zero? Give an example of such a situation.
A. An object moving in a circle with uniform speed has no change of speed but it has acceleration. It has centripetal acceleration towards the center of the circle. B. An object moving in a triangle with non-uniform speed has no change of speed but it has acceleration. It has scalar acceleration towards the center of the triangle. C. An object moving in an ellipse with uniform speed has no change of speed but it has momentum. It has centripetal acceleration towards the tangent of the circle.