The chemical properties of calcium and strontium are similar because both
a. are located on the left side the periodic table.
b. are in the same group.
c. have four electrons in the first shell.
d. are in the same period.
b
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Newton's version of Kepler's third law states: p2 = × a3 In this equation, what does G represent?
A) the orbital period B) the average distance between the two objects C) the masses of the two objects D) the universal gravitational constant
One of the discoveries made by the Voyager probes while near Jupiter was
A) Io has a featureless surface that never changes. B) a thin ring of dust around the equator. C) the absence of a magnetic field around the giant planet. D) that the Great Red Spot is uniform and featureless. E) each of the four large moons produces a strong magnetic field.
A movie projector is equipped with a 0.5-meter focal length lens that is positioned 0.506 meters from the film. (a) How far from the lens must the screen be if the image on it is to be in focus? (b) How many times larger is the image than the object? (c) Is the image produced a real or a virtual image?
A spaceship, traveling at WARP 1/2 away from the Earth, launches a shuttle moving away from the ship at c/2 (c/2 seen from the ship)
Classically one expects to see the shuttle moving at c from the Earth, but relativistically what speed do we expect seen from the Earth? A) 0.9c B) 0.5c C) 0.8c D) 0.7c E) 0.6c