Cassini is the name of:
A) the French astronomer who first discovered a gap in Saturn's rings.
B) a gap in the rings created by a resonance with Mimas.
C) NASA's orbiter now taking photos of Saturn.
D) All of the above.
E) None of the above.
D
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Gravitational waves
A. carry material into black holes. B. do not carry energy. C. are traveling distortions of space and time. D. are how pulsars pulse.
When the microwave background radiation was emitted, about how big was the universe?
A) smaller than the head of a pin B) 1/1,000,000 its current size C) 1/100,000 its current size D) 1/1,000 its currents size E) 1/100 its current size
Which of the following does not lend support to the idea that Pluto is a Kuiper-belt object?
A) Pluto has a cometlike composition and density. B) Pluto is regarded by many to be a planet. C) Some asteroids have their own moons. D) Pluto has a more eccentric orbit than other planets. E) Some known Kuiper-belt objects are hundreds of kilometers across.
A cable is 100-m long and has a cross-sectional area of 1 mm2. A 1000-N force is applied to stretch the cable. The elastic modulus for the cable is 1.0 × 1011 N/m2. How far does it stretch?
A) 0.001 m B) 0.01 m C) 0.10 m D) 1.0 m E) 10 m