Which of the following is not caused by side branches on a polymer?
(a) Decreased density
(b) Decreased transparency
(c) Decreased crystallinity
(d) Decreased hardness
(b) Decreased transparency
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Series Resonance: What is the resonance frequency of a series ac circuit consisting of a 40.0 ?F capacitor, a 55-? resistor, and a 0.030 H inductor?
A. 0.15 kHz B. 0.9 kHz C. 6.9 kHz D. 6 kHz
Compared to a bar of pure gold, the density of a pure gold ring is
A) less. B) the same. C) slightly more. D) much more.
The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight (? = 500 nm)?
a. 0.01 rads b. 10?5 rads c. 10?3 rads d. 10?4 rads e. 0.1 rads
Dark matter is detectable in the coronae of ____
a. elliptical galaxies only b. spiral galaxies only c. irregular galaxies only d. spiral and elliptical galaxies only e. all galaxies