The Sun is at one focus of the elliptical orbit of the Earth around the Sun. What is at the other focus?
A. Nothing.
B. Jupiter.
C. The Moon.
D. The Earth.
E. Mars.
Ans: A. Nothing.
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RC Circuits: A charged capacitor is connected in series with a resistor and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the charge Q on the capacitor as a function of time t?
A. A B. B C. C D. D E. E
A stratified liquid flows in an 80-cm-wide, 40-cm-high channel with the density distribution ? (y) = 800(1+ 0.2y) kg/m3 and a uniform velocity distribution of 1.2 m/s, with y measured from the bottom of the channel. The mass flux is nearest:
A) 260 kg/s (B) 280 kg/s (C) 300 kg/s (D) 320 kg/s
A negatively charged rod is brought close to an uncharged electroscope. While the rod is close one's finger touches the far side of the metal ball on the electroscope. After the charged rod has been removed the finger is removed. The electroscope is
A. positively charged. B. uncharged. C. negatively charged.
The ALH84001 meteorite, discovered in Antarctica, came from ________, and suggests it may once have had life
Fill in the blank(s) with correct word