Electrical charges and magnetic poles have many similarities, but one difference is:
a. opposite magnetic poles repel.
b. one magnetic pole cannot create magnetic poles in other materials.
c. a magnetic pole cannot be isolated.
d. magnetic poles do not produce magnetic fields.
c
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Which of the following statements about the asteroid belt is not true?
A) The combined mass of all the asteroids is roughly the same as the mass of Earth. B) It is located between the orbits of Mars and Jupiter. C) Asteroids in the asteroid belt orbit the Sun in the same direction that planets orbit the Sun. D) Asteroids in the asteroid belt are made mostly of rock.
Which of the following is not evidence supporting the giant impact theory for the formation of the Moon?
A) Computer simulations show that the Moon could really have formed in this way. B) The composition of the Moon is similar to that of Earth's outer layers. C) The Moon is depleted of easily vaporized materials, as we would expect from the heat of an impact. D) Scientists have found several meteorites that appear to be the remains of the object that caused the giant impact. E) We see signatures of giant impacts on other planets.
In a one-dimensional system, a standing wave is the result of ________
A) two equal amplitude, equal wavelength waves traveling in the same direction. B) two waves of different amplitude, but equal wavelength traveling in the same direction. C) two waves of different frequency, but equal amplitude traveling in the same direction. D) two waves of different frequency, but equal amplitude traveling in opposite directions. E) two equal amplitude, equal wavelength waves traveling in opposite directions.
The value 1.38 × 10^-23 J/K is known as:
a. the universal gas constant. c. Avogadro's number. b. Boltzmann's constant. d. the molar specific.