According to Kepler's laws, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is it that Kepler's laws indicate is at the other focus of the ellipse?
a. nothing
b. the Earth
c. The comet itself passes through the other focus.
d. The tail of the comet stays at the other focus.
A
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The nuclear reactions in a star's core remain under control so long as
a. luminosity depends on mass. b. pressure depends on temperature. c. density depends on mass. d. weight depends on temperature. e. temperature depends on mass.
Most of the mass of the universe is in the form of
A) stars B) gas clouds C) black holes D) dark matter
The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730 y. If an archaeologist working a dig finds an ancient firepit containing some partially consumed firewood and the wood contains only 12.5 percent of the 14C content of an equal carbon sample from a present-day tree, what is the age of the ancient site?
For the following reaction, identify whether the compound in bold is behaving as an acid or a base
H3PO4 + H2O ? H2PO4- + H3O+ A) acid B) base C) neither D) both E) none of the above