The allowed shapes for the orbits of objects responding only to the force of gravity are
A) ellipses, parabolas, and hyperbolas.
B) ellipses only.
C) ellipses, spirals, and parabolas.
D) circles and ellipses.
A
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The wave front shown at the left for light in air reaches the plane boundary between air and two transparent mediums with n1 = 1.5 and n2 = 3.00, respectively.
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Which diagram below correctly illustrates the wave front after it has entered the two mediums at the right?
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A. A B. B C. C D. D E. E
Electric generating plants are usually rated in "megawatts". This is a unit of
A) force. B) power. C) energy. D) both energy and work. E) work.
Which of the following materials would not react with oxygen?
(a) Titanium (b) Stainless steel (c) Silicon carbide (d) Alumina
The force of a falling apple hitting the ground depends upon
A) the speed of the apple just before it hits the ground. B) the time of contact with the ground. C) whether or not the apple bounces. D) all of the above