Ammonia, NImage, is more polar than is borane, BImage because it
A) has a lone pair of electrons.
B) is less symmetrical than borane.
C) its hydrogens are not exactly opposite one another.
D) all of the above
Answer: D
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This diagram represents an edge-on view of our Milky Way Galaxy. Of the four labeled points, which one is located in what we call the halo of the galaxy?
A) point 1 B) point 2 C) point 3 D) point 4
The rear window in a car is approximately a rectangle, 2.1 m wide and 0.45 m high. The inside rearview mirror is 0.55 m from the driver's eyes, and 1.70 m from the rear window.
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Brownian motion is caused by
A) thermal agitation. B) perpetual motion. C) particles larger than atoms bumping into them. D) interactions between atoms and molecules. E) almost invisible bugs.
The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
A. 23 mN B. 64 mN C. 32 mN D. 46 mN E. 55 mN