Why do sunspots appear dark?
A) They are regions that are significantly cooler than the rest of the photosphere.
B) They are thick clouds on the sun, blocking its light.
C) They are composed of different elements than the rest of the sun.
D) They are regions nearly devoid of gas.
A
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A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is
A) 1/2 m/s. B) 2/5 m/s. C) 5/6 m/s. D) 6/5 m/s. E) 1 m/s.
Which of the following is not directly involved in the second law of thermodynamics?
a. Spontaneous heat flow b. Converting all heat input into work c. Conservation of energy d. Entropy
Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it?
a. A b. C c. B d. All have equal magnitude forces on them.
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal to the flux through the other half of the Gaussian surface. This is
a. never true. b. never false. c. true whenever enclosed charge is symmetrically located at a center point, on a center line, or on a centrally placed plane. d. true whenever no charge is enclosed within the Gaussian surface. e. true only when no charge is enclosed within the Gaussian surface.