How can astronomers measure the period of a planet's orbit?
A) by measuring the time between peaks in the star's velocity curve
B) by timing the cycle of small changes in a stars position on the sky
C) by measuring the time between repeated transits
D) all of the above
D
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When Voyager 2 flew by Neptune in 1989, the largest feature observed was the _____, which is roughly the size of Earth
A) Cassini Division B) Great Dark Spot C) Kuiper Belt D) Maunder Minimum
A ball is projected upward at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground
The initial velocity of the ball is Consider all quantities as positive in the upward direction. The velocity of the ball when it is above the ground is closest to A) -38 m/s. B) -30 m/s. C) -23 m/s. D) -15 m/s. E) -45 m/s.
Buoyancy: A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg. What is the tension in the lifting cable (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water?
A. (a) 2.0 × 105 N (b) 1.7 × 105 N B. (a) 1.7 × 105 N (b) 2.0 × 105 N C. (a) 2.6 × 103 N (b) 2.0 × 105 N D. (a) 2.0 × 105 N (b) 2.6 × 103 N
Why has direct imaging found so few exoplanets?
A) Direct imaging is only possible using military satellites. B) Direct imaging only works if the planet is orbiting a brown dwarf. C) Only a few attempts have been made to directly image an extrasolar planet. D) Exoplanets are faint and are usually close to their parent stars.