The stars ? Cygni and ? Cygni are in the constellation Cygnus. Which statement is true?
A) ? Cygni appears brighter.
B) ? must be the eastern most star in the constellation.
C) ? appears redder.
D) ? is hotter.
E) ? Cygni appears brighter.
E
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In the hypothetical atomic interaction shown in figure C9.13, assume that the atoms initially have zero radial velocity at a separation of 0.25 nm. If the atoms are jostled slightly so that the system gains a slight amount of energy, what happens to the atoms’ separation afterward?
A. It oscillates within a small region about r = 0.25 nm.
B. It oscillates between r = 0.25 nm and r = 0.05 nm.
C. It directly increases toward infinity.
D. It eventually increases toward infinity, maybe directly but maybe after one detour to smaller separations.
E. So me other behavior (specify).
Human beings obtain energy from chemical reactions and carbon from other organisms. Given this, they can be classified metabollically as
A) photoheterotrophs B) chemoheterotrophs C) chemoautotrophs D) photoautotrophs
A sphere of radius 25 cm is at the bottom of a pool containing fresh water. If the total force on the sphere due to the water is 1025 N, what is the depth of the sphere below the surface? The air pressure outside is 101.5 kPa.
A. 7.6 m B. 5.7 m C. 52.8 m D. 13.2 m E. 2.9 m F. 39.6 m
Potential: If the result of your calculation of a quantity has SI units kg ? m2/(s2 ? C), that quantity could be
A. an electric field strength. B. a dielectric constant. C. an electric potential difference. D. a capacitance E. an electric potential energy.