Power: Water flows over a waterfall that is 20 m high at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
Fill in the blank(s) with the appropriate word(s).
3.1 MW
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A filtergram is used to study layers below the photosphere
a. True b. False Indicate whether the statement is true or false
Which of the following is not a line of evidence supporting the hypothesis that our Moon formed as a result of a giant impact?
A) The Pacific Ocean appears to be a large crater—probably the one made by the giant impact. B) Computer simulations show that the Moon could really have formed in this way. C) The Moon's average density suggests it is made of rock much more like that of the Earth's outer layers than that of Earth as a whole. D) The Moon has a much smaller proportion of easily vaporized materials than Earth.
When introduced into a region where an electric field is present, a proton with initial velocity 
will eventually move
A. along an electric field line, in the positive direction of the line. B. along an electric field line, in the negative direction of the line. C. to a point of decreased potential. D. to a point of decreased potential. E. as described in both (a) and (c).
A spring with spring constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when its extension is
a. 0.060 m. b. 0.085 m. c. 0.12 m. d. 0.17 m. e. 0.24 m.