A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the tangential velocity of a point 3.0 cm from the center of the CD after 3.0 sec is
A. 18 cm/s.
B. 21 cm/s.
C. 25 cm/s.
D. 32 cm/s.
E. 45 cm/s.
A. 18 cm/s.
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Total Internal Reflection: A tank holds a layer of oil, of thickness To = 1.65 m, that floats on a layer of syrup of thickness Ts = 0.830 m, as shown in the figure. Both liquids are clear and do not mix together. A light ray, originating at the bottom of the tank at point P, crosses the oil-syrup interface at a point 0.900 m from the axis. The ray continues and arrives at the oil-air interface, 2.00 m to the right of P and at the critical angle. What is the index of refraction of the syrup?
A. 1.36 B. 1.25 C. 1.94 D. 1.75 E. 1.54
A gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely. The mass of the piston is 10.0 kg,
and the initial height of the piston above the bottom of the cylinder is 25 cm. A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm
What is a T Tauri star?
A. any variable star B. a young star that exhibits variable light and outflowing gas C. any star found in the constellation of Taurus D. a red giant with a peculiar spectrum
Compared to the Sun's convection zone, it is generally hotter in the
A) radiation zone. B) photosphere. C) core. D) All of the above.