Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens?
a. Protons are removed from the rod. c. Electrons are added to the rod. b. The fur is left neutral.
d. The fur is also charged negatively.
C
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For a rod in tension, what material class provides the highest specific critical-stress intensity factor?
(a) Steels (b) Titanium alloys (c) Aluminum alloys (d) Uni-ply composites (GFRP, CFRP, and KFRP)
An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates
All the geometric parameters of the capacitor (plate diameter and plate separation) are now DOUBLED. If the original energy density between the plates was u0, what is the new energy density? A) 16u0 B) 4u0 C) u0 D) u0/4 E) u0/16
Radioactive dating methods and other dating methods indicate that hominids have been on Earth for about
A) 15 billion years. B) 5 billion years. C) 5 million years. D) 100,000 years. E) 5000 years.
In the fission theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.