How do we know what asteroids are made of?
A. The spectrum of sunlight reflected from an asteroid shows absorption features, from which we can determine its composition.
B. Astronomers have landed a spacecraft on one of them and analyzed its composition.
C. Astronomers have studied meteorites that originated in the Asteroid belt.
D. All of these choices are correct.
Answer: D
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A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
a. 4.1 cm b. 2.9 cm c. 3.4 cm d. 5.1 cm e. 2.4 cm
That the Moon has no magnetic field implies that
a. the Moon is spinning too slowly to produce a magnetic field. b. the interior of the Moon is too hot to produce a magnetic field. c. the crust of the Moon is so thick that the magnetic field cannot get out of the interior. d. the Moon's core contains little if any molten iron. e. the Moon is moving further from Earth.
When you touch a hot potato with your finger, energy flows
A) from your finger to the potato. B) from the potato to your finger. C) actually, both ways.
Which of the following are the jovian planets?
A) Jupiter, Saturn, Uranus, Neptune, and Pluto B) only Jupiter C) only Jupiter and Saturn D) Jupiter, Saturn, Uranus, and Neptune only E) everything past Mars and the asteroid belt