Why was the Shoemaker-Levy 9 impact so important to astronomers?
A) It dredged up material that gave us our first direct look at Jupiter's interior composition.
B) It confirmed our theory of solar system formation.
C) It wiped out the dinosaurs.
D) It was the first direct proof that impacts really occur.
E) It was the first event in modern history that was brighter than the full moon in the sky.
A
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A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A) 70 cm B) 63 cm C) 75 cm D) 66 cm E) 58 cm
What does Hubble's law tell us?
A) The longer the period of a Cepheid variable, the greater its luminosity. B) The more distant a galaxy, the faster it is moving away from us. C) The faster a spiral galaxy's rotation speed, the more luminous it is. D) For every force, there is an equal and opposite reaction force.
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will
A) be constant. B) decrease. C) increase. D) depend on their weight. E) depend on the speed of the plane.
The kilowatt-hour is a unit of
a. power c. voltage b. energy d. current