How large a force is necessary to stretch a 2.0-mm diameter copper wire (Y = 11 × 10^10 N/m2) by 1.0%?
a. 2.1 kN
b. 3.5 kN
c. 6.9 kN
d. 11 kN
e. 5.4 kN
b
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The horizontal axis (X-axis) of the Hertzsprung-Russell diagram is labeled with _______________
Fill in the blank(s) with correct word
Looking through your telescope tonight, you observe a distant galaxy called RXJ1800 and notice that it is very near in the sky to the bright star Vega. What can you conclude from this observation?
A) RXJ1800 and Vega will both set in the west at about the same time. B) Vega orbits the center of mass of RXJ1800. C) Vega and RXJ1800 must be no more than a few light-years apart. D) If you observe them again in a few nights, RXJ1800 and Vega will be farther apart than they appear tonight.
Which of the following provides the longest cable run distance?
A. Single-mode fiber. B. multi-mode fiber. C. category 3 UTP D. Coax.
The visible color of the Galactic Bulge is
A) red from the emission nebulae. B) blue from the OB associations. C) black from the dust clouds. D) yellow from the old Population II stars. E) brown from the dwarfs in the dark matter.