The nadir marks the point of the celestial sphere directly above your head
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following is the most geologically active moon?
A) Ganymede B) Callisto C) Europa D) Io
When an air sample is at its dew point
a) the relative humidity is 50%. b) Rayleigh scattering occurs. c) the air is completely saturated. d) the barometric pressure must be equal to 30 in. of Hg (mercury).
A circular loop of wire of area 25 cm2 lies in the plane of the paper. An increasing magnetic field B is coming out of the paper. What is the direction of the induced current in the loop?
A) There is no current. B) counterclockwise then clockwise C) clockwise then counterclockwise D) clockwise E) counterclockwise
In terms of energy levels of electrons, a potential well has
a. a negative value. b. a positive or a negative value. c. a positive value. d. none of these.