A diver shines light up to the surface of a flat glass-bottomed boat at an angle of 30° relative to the normal. If the index of refraction of water and glass are 1.33 and 1.5, respectively, at what angle (in degrees) does the light leave the glass (relative to its normal)?
a. 26
b. 35
c. 42
d. 22
e. 48
c
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A crate travels through a factory on a horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?
A. Normal force, weight, static friction. B. Normal force, weight, force of the conveyor belt C. Normal force, weight, force of the conveyor belt, static friction D. Normal force and weight.
How did Harlow Shapley determine the distances to globular clusters in the Milky Way galaxy?
A. He used the Period-Luminosity Relation of RR Lyrae variable stars so they could be used as standard candles. B. He used the radial velocity technique as a globular cluster orbits around a companion cluster. C.He measured the distance to the Galactic center and assumed all clusters were at that same distance. D. He used the parallax technique with a satellite designed to have a larger baseline than could be achieved from Earth. E. He used the parallax technique by viewing the clusters at two different times from the orbit of Earth.
Ming measures a recession velocity of 2000 km/sec for a galaxy. About how far away is that galaxy if the Hubble constant is 20 km/sec/million light years? (Hint: be sure to check the units in your calculation.)
A) 100 million light years B) 100 light years C) 40 thousand light years D) 40 billion light years
In the reaction 
how much energy is released or absorbed? The mass of 4He is 4.0026032 u, the mass of 9Be is 9.0121821 u, the mass of n is 1.0086649 u, and the mass of 12C is 12.0000000 u.
A. 4.21 MeV absorbed B. 4.21 MeV released C. 5.70 MeV absorbed D. 5.70 MeV released E. 6.34 MeV released