What does the Drake Equation estimate?
A: The number of planets with life on them in the Milky Way
B: The number of planets with intelligent life in the Milky Way
C: The number of technological civilizations in the Milky Way
D: The number of civilizations within 50 light years of us
E: None of the above
Ans: C: The number of technological civilizations in the Milky Way
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A series of 3 uncharged concentric spherical conducting shells surround a small central charge q. The potential at a point outside the third shell, at distance r from the center, and relative to V = 0 at ?, is
A.
.B.
.C.
.D.
.E.
.In modern astronomy, an interferometer
a. is the highest resolution optical telescope ever built. b. is located in Arecibo, Puerto Rico. c. is a set of optical telescopes linked together to provide very high resolution. d. is a set of radio telescopes linked together to provide very high resolution. e. is either a set of optical telescopes linked together to provide very high resolution or is a set of radio telescopes linked together to provide very high resolution.
The electron orbiting the proton in the hydrogen atom is at a distance of 
m. What is the magnitude of the electric force between the proton and the electron?
a. 
b. 
c. 
d. 
e. 
A normal force
A. is any everyday force B. is the gravitational force C. acts perpendicular to the surface D. is always equal to the weight of an object.