A person weighing 180 pounds stands on snowshoes. If the total area of the 2 snowshoes is 900 square inches, what is the pressure on the snow?
0.2 psi
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The Drake equation now tells us that the number of technological civilizations in our Galaxy at this time is:
A) only our own. B) five to ten at most. C) perhaps 3,000. D) millions. E) not known; insufficient data to compute.
Where is dark matter found in the periodic table?
A) within the noble gas elements B) the transition metals C) all radioactive elements D) no where at all
In the Compton effect, a photon of wavelength 
and frequency f is scattered from an electron. Initially, at rest
A. the electron gains energy from the photon so that the scattered photon's wave length is less than
B. the electron gives energy to the scattered photon so the photon's frequency is greater than f.
C. momentum is not conserved, but energy is conserved.
D. the photon loses energy so that the scattered photon has a frequency less than f.
Two converging lenses, the first with focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. What is the height of the final image?
A. 3.00 cm B. 1.50 cm C. 6.00 cm D. 12.0 cm E. 24.0 cm