The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 × 10^30 kg, in an almost circular trajectory. Calculate the radius of the orbit and the orbital speed of Venus as it circles the sun
1.08 × 10^11 m, 34.9 km/s
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Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about the Moon would be
A) less than 8 km/s. B) greater than 8 km/s. C) about 8 km/s.
The magnetic field inside a solenoid having 100 turns per cm at a current of 5.0 A is
a. 
b. 
c. 
d. 
e. 
Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V. B. 100 V. C. 200 V. D. none of the given answers.
Inward migration is a hypothesis used to explain why
A) Jupiter-sized planets are seen orbiting close to some stars B) some stars do not have Jupiter-sized planets C) some stars do not have planets at all D) Terrestrial-sized planets are seen orbiting far from some stars