A future news release might report that a new planet has been found around a star very similar to our sun. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be a reasonable prediction about this planet? I. The planet will probably have a mean density of around 5 g/cm3. II. The planet will
probably have a radius of around five to ten times greater than Earth's. III. The planet will probably have several satellites. IV. The planet will probably have a composition that is mostly hydrogen and helium.
a. I & IV
b. I, II, & III
c. II, III, & IV
d. I, II, & IV
e. I, II, III, & IV
C
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Three forces are exerted on an object and as a result the object moves with a constant velocity. One force is 60.0 N along the +x-axis, and the second is 75.0 N along the +y-axis. What is the magnitude of the third force?
A) 135 N B) 15.0 N C) 48.0 N D) 67.5 N E) 96.0 N
An up quark (u) has a charge +2/3, and a down quark (d) has a charge of -1/3. Which of the following describes a proton?
A) uuu B) uud C) udd D) ddd
How do we think the "hot Jupiters" around other stars were formed?
A) They formed as jovian planets close to the star in the same orbits that they are seen today. B) They formed as dense, rocky planets close to the star in the same orbits that they are seen today. C) They formed as jovian planets beyond the frost line and then migrated inward. D) Many planets were formed around the star but coalesced into a single planet close in. E) They spun off from the young star when it was rapidly rotating.
Interstellar dust consists mostly of ________
A) the same tiny particles found in household dust B) tiny grains of water ice C) ozone "smog" D) microscopic particles of carbon and silicon E) hydrogen and helium atoms