A solid sphere, a solid cylinder, and a hoop each have the same mass and radius. If they are spinning at the same angular velocity, which one has the greatest angular momentum?
a. the sphere
b. the cylinder
c. the hoop
d. They all have the same angular momentum.
C
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Light strikes a diamond (n = 2.42) immersed in glycerin (n = 1.473) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
a. 20° b. 60° c. 32° d. 64° e. 15°
What did Tycho do that advanced astronomy significantly?
a. He realized that orbits didn’t have to be circles, they could be ellipses. b. He made more accurate observations than anyone before him. c. He thought of the idea of circles moving on circles (epicycles) to explain planetary motion.
The F in FM radio stands for
A) frequency. B) forced vibration at which resonance occurs. C) foul. D) female. E) fax.
A solar-mass star will evolve off the main sequence when
A) it loses all its neutrinos, so fusion must cease. B) it completely runs out of hydrogen. C) it builds up a core of inert helium. D) it explodes as a violent nova. E) it expels a planetary nebula to cool off and release radiation.