So far, beyond the solar system, the extrasolar planets found have been mostly
A) terrestrials with very elongated, distant orbits like comets.
B) terrestrials very close to their star, and transiting its disk.
C) large jovians very close to their star.
D) large jovians orbiting solar-type stars about where our jovians are found.
E) brown dwarfs much more massive than Jupiter.
C
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You can experience weight
A) standing on Earth's surface. B) in an accelerating elevator away from Earth. C) in a rotating habitat in space. D) all of the above
According to Copernicus, retrograde motion for Venus must occur around
A) greatest elongation, when the planet is farthest from the Sun. B) inferior conjunction, when it passes between us and the Sun. C) superior conjunction, when the planet is on the far side of the Sun. D) quadrature, when the planet is 90 degrees away from the Sun. E) opposition, when the planet lies opposite the Sun in the sky.
Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2 b. 2.4 m/s2 c. 3.3 m/s2 d. 2.9 m/s2 e. 5.7 m/s2
The radioactive isotope 7Be (atomic number 4 ) decays to the isotope 7Li (atomic number 3). What type of radioactive decay is this?
A) electron capture B) beta decay C) electron ionization D) alpha decay