Heat a copper wire and its electric resistance
A) decreases.
B) remains unchanged.
C) increases.
Answer: C
Physics & Space Science
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Which of the following copper alloys can be precipitation hardened to a relatively high yield strength?
(a) Beryllium copper (b) Cartridge brass (c) Copper nickel (d) Aluminum bronze
Physics & Space Science
The first living organisms probably resembled
A) single-celled eukaryotes B) multicellular eukaryotes C) single-celled prokaryotes D) multicellular prokaryotes
Physics & Space Science
In pair creation, an electron-positron pair is created from
A) a photon. B) a neutron. C) a neutrino. D) a rabbit. E) nothing.
Physics & Space Science
What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.30 cm and 4.1 cm, respectively, and a separation between lenses of 40 cm?
a. 320 b. 33 c. 32 d. 810 e. 7.1
Physics & Space Science