A 2.0-? resistor is in series with a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What is the equivalent resistance of this system?
A) 24 ?
B) 4.0 ?
C) 1.8 ?
D) 2.7 ?
B
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Which type of main-sequence star(s) is a good candidate for searching Earth-like planets with life?
a. O and B b. G and K c. A and F d. white dwarfs e. binary stars
A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the shore) in order to travel directly across the stream. (a) Determine the speed of the current
(b) Determine the resultant speed of the boat with respect to the shore.
The star Algol is
a. an astrometric binary. b. a spectroscopic binary. c. a visual binary. d. an eclipsing binary. e. a spectroscopic binary and an eclipsing binary.
You fill your backpack with snacks for the long flight over to Europe on your summer vacation. When you take out your bag of chips mid- flight
A. it looks just like it did when you packed it at home. B. it has shrunk and all of your chips are crushed. C. it has puffed up and looks like it could pop.