The quantity "stress" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:
a. MLT-1.
c. M2L-1T-3.
b. ML-1T-2.
d. a dimensionless quantity.
B
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Type II supernovae and star forming regions are related to one another because
A) they both contain ionized hydrogen. B) they both involve high mass ionizing stars. C) the shock waves of a supernova can trigger star formation. D) as a result of both processes, lighter elements are transformed into heavier elements. E) all of the above.
Long period comets are thought to reside mainly in the:
A) asteroid belt. B) Kirkwood gaps. C) Kuiper Belt. D) Oort Cloud. E) Interstellar Medium.
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his angular momentum about the axis of rotation?
A) It does not change. B) It increases. C) It changes, but it is impossible to tell which way. D) It decreases.
Which is more polar, a sulfur-bromine (S-Br) bond or a selenium-chlorine (Se-Cl) bond?
A) A selenium-chlorine bond should be more polar because of a greater difference in effective nuclear charge. B) A selenium-chlorine bond should be more polar because of a smaller difference in effective nuclear charge. C) A sulfur-bromine bond should be more polar because of a greater difference in effective nuclear charge. D) A sulfur-bromine bond should be more polar because of a smaller difference in effective nuclear charge.