How many elements have been identified?
a. 92
b. 104
c. 114
d. over 200
e. none of the above
c
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Which of the following is not a thermoplastic polymer?
(a) Polyethylene (b) Epoxy (c) Polyvinylchloride (d) Polypropylene
To someone moving horizontally at a speed of 0.99c past a vertical meter stick, the stick will appear to be 100 cm long.
a. true b. false
What is the difference between spectroscopic and visual binaries?
A. Spectroscopic binaries have double spectral lines but do not move. B. In a visual binary we can see two distinct stars; in spectroscopic binaries, the images of the two stars cannot be resolved. C. Visual binaries are pairs of stars in the same region in the sky but are not gravitationally interacting. D. A visual binary does not show changes in the spectral lines.
Inductive reactance XL is given by
a. L? b. L/? c. 1/L? d. ?/L e. ?2L