A supernova can occur when:
a) a massive star is on the Main Sequence
b) the center of a 1 solar mass star stops burning Hydrogen in its core
c) material from a companion star falls onto a white dwarf
d) material from a red supergiant falls into a black hole
e) a low mass star is on the Main Sequence
Ans: c) material from a companion star falls onto a white dwarf
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A circular aluminum tube of length L 5 650 mm is loaded in com-pression by forces P. The outside and inside diameters are 80 mm and 68 mm, respectively. A strain gage on the outside of the bar records a nor-mal strain in the longitudinal direction of 400 3 1026. The shortening of the bar is approximately:
(A) 0.12 mm
(B) 0.26 mm
(C) 0.36 mm
(D) 0.52 mm
Which has more volume, a liter or a quart?
a. A liter b. A quart c. Both are the same d. Neither describes volume
How is the solubility of a solid affected by temperature?
A) As temperature goes up, the solubility goes up. B) As temperature goes down, the solubility goes down. C) As temperature goes up, the solubility goes down. D) As temperature goes down, the solubility goes up. E) both A and B
Both reflecting and refracting telescopes may use a lens called the eyepiece
Indicate whether the statement is true or false