"Ice that burns" is better known as
a. propane.
b. frozen oil.
c. coal.
d. methane hydrate.
d
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A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen
An electronic game requires 6 V for operation. With a transformer it can be powered by a 120-V outlet. If the primary has 500 turns, the secondary has
A) 4 turns. B) 25 turns. C) 50 turns. D) more than 50 turns. E) none of the above
The greatest percentage of heat loss from an average house with 6-inches of fiberglass in the walls, 4- inches in the floor, 9-inches in the roof, and double pane windows, comes from the ________
a. roof b. walls c. floor d. windows
Observationally, how can we tell the difference between a white-dwarf supernova and a massive-star supernova?
A) A massive-star supernova is brighter than a white-dwarf supernova. B) A massive-star supernova happens only once, while a white-dwarf supernova can repeat periodically. C) The light of a white-dwarf supernova fades steadily, while the light of a massive-star supernova continues to brighten for many weeks. D) The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not. E) We cannot yet tell the difference between a massive-star supernova and a white-dwarf supernova.