For a star of Sun-like mass, what is the last stage of the nuclear fusion?
a. Hydrogen to helium.
b. Helium to carbon and oxygen.
c. Carbon to magnesium.
d. Fusion goes all the way up to iron.
B
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To make an uncharged object have a negative charge we must:
A) add some atoms B) remove some atoms C) add some electrons D) remove some electrons E) write down a negative sign
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. In what direction does the wreckage move just after the collision?
A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E
A mixture of ethanol and gasoline is called
a. ethaline. b. gasanine. c. gasohol. d. gethanine.
An isolated black hole will
A. eventually suck in all of the universe. B. not change in any way. C. implode due to its own gravity. D. slowly evaporate away through the emission of Hawking radiation.