A carbon resistor has a resistance of 18 ? at a temperature of 20°C. What is its resistance at a temperature of 120°C? (The temperature coefficient of resistivity for carbon is -5.0 × 10-4 /C°.)
A) 18 ?
B) 17 ?
C) 16 ?
D) 15 ?
E) 14 ?
B
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Which of the following best describes rain on Venus?
A) It does not have rain. B) It has sulfuric acid rain that causes erosion on the surface. C) It has sulfuric acid rain in its atmosphere, but the drops evaporate before hitting the surface. D) It has liquid water rain that causes erosion on the surface.
Why is it that the quasars we see represent a time when the universe was younger?
What will be an ideal response?
A satellite is powered by a small nuclear generator that puts out 20 W. How much matter is converted into energy over the 10 year life span of the generator?
a. 70 µg c. 53 kg b. 53 g d. 53 µg
The force that holds atoms together to form molecules is
1) electric, 2) magnetic, 3) gravitational, 4) nuclear, and the force that holds the protons in a nucleus together is 5) electric. 6) magnetic. 7) gravitational. 8) nuclear.