Negative temperature coefficients of resistivity
A) exist in superconductors.
B) do not exist.
C) exist in semiconductors.
D) exist in conductors.
C
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For safety in climbing, a mountaineer uses a 50-m long nylon rope that is 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find the Young's modulus for the rope material
As a star's evolution approaches the Type II supernova, we find
A) photo disintegration of iron nuclei begins at 10 billion K to ignite the supernova. B) helium to carbon fusion takes at least 100 million K to start. C) the heavier the element, the higher the temperature to fuse it. D) the heavier the element, the less time it takes to make it. E) All of the above are correct.
A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin. The disk carries a total charge of +3.00 ?C distributed uniformly over its surface
Calculate the magnitude of the electric field due to the disk at the point x = 15.0 cm along the x-axis. (?0 = 8.85 × 10-12 C2/N ? m2) A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.31 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C
What methodology do astronomers use to map the inside of the Sun?
a. coronagraphy b. magnetic field mapping c. helioseismology d. chromography e. heliogeology