An x-ray image is typically used to diagnose which of the following?
a. A muscle tear
b. A broken bone
c. Cardiac arrhythmia
d. Low blood-oxygen levels
Ans: b. A broken bone
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Spiral galaxy rotation curves are generally fairly flat out to large distances. Suppose that spiral galaxies did not contain dark matter. How would their rotation curves be different?
A) The orbital speeds would fall off sharply with increasing distance from the galactic center. B) The orbital speeds would rise upward with increasing distance from the galactic center, rather than remaining approximately constant. C) The rotation curve would be a straight, upward sloping diagonal line, like the rotation curve of a merry-go-round. D) The rotation curve would look the same with or without the presence of dark matter.
An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball. B) heavier iron ball. C) both hit at the same time. D) not enough information
Capacitors in Combination: When two or more different capacitors are connected in series across a potential source, which of the following statements must be true? (There could be more than one correct choice.)
A. The total voltage across the combination is the algebraic sum of the voltages across the individual capacitors. B. Each capacitor carries the same amount of charge. C. The equivalent capacitance of the combination is less than the capacitance of any of the capacitors. D. The potential difference across each capacitor is the same. E. The capacitor with the largest capacitance has the most charge.
The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?
a. 0.5 × (Irms)2R b. (Irms)2R c. 2.0 × (Irms)2R d. 4.0 × (Irms)2R