Why was the 1978 Nobel Prize in Physics given to Penzias and Wilson from Bell labs?
What will be an ideal response?
They discovered the 3 K background radiation that is a remnant of the Big Bang.
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Specular reflection occurs whenever
A. rays reflect from a surface. B. rays reflect in all directions from a surface. C. rays reflect at only one angle from a surface. D. parallel rays reflect at the same angle from a surface. E. visible light rays reflect.
Which of these is NOT a characteristic of the solar nebula theory?
A) The ecliptic is the equator for the Sun. B) All the planets should follow the ecliptic plane. C) All the planets should orbit the Sun counterclockwise. D) Larger planets should form closer to their star, where there is more debris. E) Planets should rotate counterclockwise as well.
A golf club exerts an average force of 1000 N on a 0.045-kg golf ball which is initially at rest. The club is in contact with the ball for 1.8 ms. What is the speed of the golf ball as it leaves the tee?
A) 30 m/s B) 35 m/s C) 40 m/s D) 45 m/s E) 50 m/s
A series RLC circuit is connected across a 240-Hz AC source, where ?Vmax = 140 V, R = 480 ?, C = 0.250 ?F, and L = 3.25 H. What is the average power delivered to this circuit?
a. 77.9 W b. 1.78 W c. 3.56 W d. 0.890 W