A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 40 m. The centripetal acceleration of the cyclist is
A. 10 m/s2, downward.
B. 10 m/s2, toward the center of the track.
C. zero.
D. 20 m/s2, in the direction of travel.
Answer: B
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Which of the following methods has been the LEAST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
Which of the following could not be determined by an observation that uses only spectroscopy?
A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the size of a distant galaxy
One disadvantage of dispersion-strengthened metals at high temperatures is that the dispersion and the matrix are not in _________with each other, and as a result the matrix and dispersion may react with each other.
Fill in the blank(s) with the appropriate word(s).
What will eventually happen to a star after its formation is most affected by its initial
a. speed through space. b. oxygen content. c. uranium content. d. anti-matter content. e. mass.