Given 4 tuning forks of frequency 446, 440, 443, and 449 Hz, how many different beat frequencies could be produced and what are they?
What will be an ideal response?
Three beat frequencies: 3, 6, 9 Hz
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Two people are on a ride where the inside cars rotate at constant angular velocity three times the constant angular velocity of the outer cars. If the two cars are in line at t = 0, and moving at 3? and ? respectively, at what time will they next pass each other?
A.
B.
.C.
.D.
.E.
.According to our theory of solar system formation, which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size?
A) Newton's third law B) the law of conservation of angular momentum C) the law of conservation of energy D) the two laws of thermal radiation
A super-insulated house is at a temperature of 20°C. The temperature outside is 0°C. The surface area of the house is 200 m2, and the emissivity is 1 . Approximately how much energy is radiated (in W) per second?
a. 20 000 b. 2 000 c. 200 d. 2 e. 0.2
Which of the following is an important starting assumption in models of galaxy formation?
A) All galaxies start out as spiral galaxies. B) Some regions in the universe start out denser than others. C) Black holes form first, seeding the formation of galaxies. D) Galaxies form first, then black holes.