Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?
a. accelerates
b. moves at the speed of light
c. moves at constant velocity
d. moves parallel to a uniform magnetic field
A
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Ohmic heating is
a. always undesirable. b. used in light bulbs. c. what makes fuses "blow". d. all of the above.
Earthquake waves are classified as P waves and S waves. Which of the following statements is true about these waves?
a. The P wave is transverse as is the S wave. b. The P wave is longitudinal as is the S wave. c. The P wave is transverse and the S wave is longitudinal. d. The P wave is longitudinal and the S wave is transverse. e. Both the P and S waves are mixtures of longitudinal and transverse waves.
Consider the five facts listed below. The nebular theory of the formation of the solar system successfully accounts for four of these facts, while one can be considered to be just a coincidence. Which fact is a coincidence?
A) Our solar system has an equal number of terrestrial and jovian planets. B) The planets all orbit around the Sun in nearly circular orbits in nearly the same plane. C) The planets divide into two major types, terrestrial and jovian. D) The solar system has many small bodies, and these are concentrated in the regions known as the asteroid belt, Kuiper belt, and the Oort cloud. E) There are many impact craters on the Moon.
Harry Potter points his wand at the sun and cries “Spotificus!” Within 8 minutes, observers all over the earth see a large string of sunspots form on the sun. Did Harry create the sunspots?
A. Yes. Harry is a very powerful wizard. B. Yes, if magical effects travel at the speed of light. C. No. This is not physically possible, even with magic.