In thermoplastic polymers, plastic strain is due to the sliding of _____________ molecules.
Fill in the blank(s) with the appropriate word(s).
long chain
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A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where
is the normal force,
is weight, and 
is tension?
a.
b.
c.
d.
e.
An insulator has a positive electric charge of 8 × 10^ -17 C. How many electrons were added or removed?
a. 500 electrons removed b. 20 electrons removed c. 500 electrons added d. 20 electrons added
Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.
Why are things torn apart when they near a back hole?
A: The part of the object closer to the black hole feels a greater force B: Space itself is stretched around a black hole C: Black holes are after all cosmic vacuum cleaners D: The spin of a black hole causes objects to twirl around and stretch E: All the atoms in the object start acting as magnets and repel each other