Kepler's Laws: As you know, the earth has an orbital period of 1.0 year at an orbital radius of 1.0 AU (astronomical unit, the average distance between the earth and the sun). If a new "minor planet" were to be found in a circular orbit with radius 13 AU, what would be its orbital period?
Fill in the blank(s) with the appropriate word(s).
47 years
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Current evidence suggests that some massive jovian planets orbit at close orbital distances to their stars. How do we think these planets ended up on these close orbits?
A) These planets migrated inward after being born on orbits much farther from their stars. B) These planets were able to form close to their stars because their solar nebulas were cold in temperature. C) Despite their large masses, these planets are made of rock and metal and therefore could form in their inner solar systems. D) These planets were captured from other solar systems.
A fast-moving ball is more easily seen if it is
A) red. B) orange. C) yellow-green. D) green-blue. E) violet.
What is the efficiency of a heat engine whose thermal energy input is 400 J and whose exhaust is 300 J?
A) 75% B) 50% C) 175% D) 25% E) 33%
A 0.12-m radius grinding wheel takes 2.1 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
a. 9.6 rad/s2 c. 1.6 rad/s2 b. 4.3 rad/s2 d. 0.33 rad/s2