One of the most likely places an advanced civilization might leave an artifact for us to find would be
A) in the desert of Roswell, New Mexico
B) the L4 and L5 points in the Earth—Moon system
C) in the Cydonia region of Mars
D) on the far side of the Moon
B
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Applications to Astronomy: Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us if H = 20 
? (c = 3.00 × 108 m/s)
A. 620 nm B. 640 nm C. 660 nm D. 690 nm
A habitable world is defined to be one that
A) is identical to the Earth B) is in orbit about a solar-type star C) has an atmosphere D) has conditions suitable for life
If you push directly on the handle of a closed door and it does not swing open, then
A. the net torque on the door must be zero. B. the lever arm must be very small. C. its rotational inertia must be much larger than your torque. D. the angular momentum of the door is larger than your force.
A radioactive isotope that emits a gamma quantum will change in what respect?
a. Atomic number increases by one. b. Atomic mass number decreases by one. c. Atomic number decreases by one. d. None of these choices are valid.