A 20-?F capacitor charged to 2.0 kV and a 40-?F capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-?F capacitor after the two are so connected?
A. 53 mC
B. 27 mC
C. 40 mC
D. 80 mC
E. 39 mC
Answer: B
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Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is
A) 0.5 light-year. B) 0.5 parsec. C) 5 light-years. D) 5 parsecs. E) 2 parsecs.
The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for
A) the position of the Celestial Equator. B) precession. C) the difference between solar and sidereal time. D) Earth's 23.5-degree tilt. E) seasons.
Alkanes minus one hydrogen atom are called ______________ groups
Fill in the blank(s) with correct word
An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°F (15°C) and the temperature well below the surface is 41°F (5°C)?
a. 3.5% b. 67% c. 31% d. 17% e. 96%