Within a stream channel, the speed of stream flow is greatest
A) at the bottom of the stream bed.
B) in the middle of the channel at the water's surface.
C) at the channel sides.
D) mid-channel between the stream bed and the water's surface.
Answer: B
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An astronomer surveying the sky toward a random region of the sky finds, by chance, the most distant galaxy ever detected. This is an example of
A) nonscience B) discovery science C) hypothesis-driven science D) pseudoscience
The one theory of the early universe before the Recombination Epoch and after the Planck Epoch that was developed to resolve a conflict between observation and theory is
A) the Grand Unified Theory. B) the theory of inflation. C) the theory of nucleosynthesis. D) the theory of recombination. E) the quantum quark theory.
The pressure at the bottom of a glass filled with water (? = 1 000 kg/m3) is P. The water is poured out and the glass is filled with ethyl alcohol (? = 806 kg/m3). The pressure at the bottom of the glass is now
1.smaller than P. 2.equal to P. 3.larger than P. 4.indeterminate.
Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
a. it is passing car A. b. it has the same linear (tangential) acceleration as car A. c. it has the same centripetal acceleration as car A. d. it has the same total acceleration as car A. e. it has traveled farther than car A since starting.