If an electron is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the electron will be toward the:
a. south. b. east.
c. west. d. north.
c
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Recent work with type I supernovae at great distances suggests the universe may in fact be accelerating its expansion, a discovery attributed to a newly found:
A) repulsive charge on dark matter. B) polarization and a universal spinning magnetic field. C) dark energy. D) magnetic field associated with antimatter. E) mass determined for the neutrinos.
At the speed of light, how long would it take to reach the nearest star, Alpha Centauri?
a. about a month b. about a year c. about 4 years d. about 1000 years e. about 1,000,000 years
According to Newton's theory of gravity, why does the Moon have a much lower acceleration than a falling object on Earth?
a. Because the Moon is so heavy. b. Because the Moon is close to Earth's center. c. Because the Moon is lighter than Earth. d. Because the Moon is farther away from Earth's center than the object falling at Earth's surface. e. Because the Moon has its own gravitational field.
How do we determine the age of a star cluster?
a) by identifying the type of stars that have just turned off the main sequence b) spectroscopic parallax c) by determining the spectral types of the faintest stars in the cluster d) radioactive dating e) by comparing the ages of white dwarfs and red giants