The flatness problem states that
a. the density of the universe is very close to the critical density.
b. the density of the universe is much larger than the critical density.
c. the density of the universe is much less than the critical density
d. the universe is two dimensional
e. the universe is one-dimensional
A
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When the temperature of the Sun's core goes up, what happens next?
A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.
Express 0.0015671 kg to three significant figures
What will be an ideal response?
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
When a target nucleus is bombarded by an appropriate beam of particles, it is possible to produce
A) a less massive nucleus, but not a more massive one. B) a more massive nucleus, but not a less massive one. C) a nucleus with smaller atomic number, but not one with a greater atomic number. D) a nucleus with greater atomic number, but not one with a smaller atomic number. E) a nucleus with either greater or smaller atomic number.