What is the resistance of 1 000 m of 4-mm diameter copper wire? (?Cu = 1.7 × 10^-8 ? / m)
1.35 ohm
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The greatest diffraction occurs for
a. ? < d. b. ? = d. c. ? > d. d. none of these; that is, it makes no difference.
The Oort Cloud is thought to be:
A) the cloud of gas and dust from which our solar system formed. B) a cloud of debris that occasionally encounters the Earth, causing a meteor shower. C) the spherical cloud of comets and some larger icy bodies surrounding the outer solar system. D) a cloud of asteroids moving between the orbits of Mars and Jupiter. E) the material in the ecliptic plane that creates the zodiacal light.
When the huge polar caps on Mars form every winter, they are made chiefly of ________
Fill in the blank(s) with correct word
The temperature coefficient of resistivity of platinum is 3.9 × 10-3/C°. If a platinum wire has a resistance of R at a temperature of 23°C, to what temperature must it be heated in order to double its resistance to 2R?
A) 730°C B) 280°C C) 300°C D) 930°C