A wave is traveling with a velocity of 350 m/s and strikes a surface at an angle of 30.0 degrees with the normal to the surface. The wave splits into a reflected part and a refracted part. The refracted wave travels with a velocity of 300 m/s. What is the angle of refraction?
A. 50.4 degrees
B. 45.2 degrees
C. 40.4 degrees
D. 38.4 degrees
E. 25.4 degrees
E. 25.4 degrees
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The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2. Assume a circular orbit
(a) What is the period of the International Space Station's orbit? (b) What is the speed of the International Space Station in its orbit?
Temperature is a measure of
1.... the total amount of heat possessed by something. 2.... the flow of energy to or from something. 3.... the total energy possessed by something. 4.... the total kinetic energy of the constituents of something. 5.... the amount of useful work that could be extracted from something. 6.None of the above.
Nuclear Reactions: Determine the missing product X in the nuclear reaction 
U + 
n ? X + 2?-.
Fill in the blank(s) with the appropriate word(s).
Why was it difficult for astronomers to develop a clear understanding of the Milky Way until the last few decades?
What will be an ideal response?