A light ray, traveling obliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this ray
A)
travels parallel to the mirror's axis.
B)
travels at right angles to the mirror's axis.
C)
passes through the mirror's center of curvature.
D)
passes through the mirror's focal point.
E)
passes through the axis midway between the mirror's focal point and center of curvature.
C
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a. True b. False Indicate whether the statement is true or false
AC Generator: An ac generator consisting of a coil with N turns rotating at angular speed ? in an external magnetic field B produces a maximum emf ?0.If you now decrease the number of turns in the coil to N/2 and at the same time cause it to rotate twice as fast, what will be the new maximum emf if you do not change any of the other quantities?
A. 4?0 B. 2?0 C. ?0 D. ?0/2 E. ?0/4
Refer to the H-R diagram above that shows the life track of a 1-solar-mass star, with various stages labeled with Roman numerals. After all its life stages are completed, the remaining core of this star will be left behind as
A) a white dwarf made primarily of carbon and oxygen. B) a white dwarf made primarily of hydrogen. C) a neutron star. D) a black hole. E) a supernova.
Graphical Interpretation of Work: A force acts on an object, causing it to move parallel to the force. The graph in the figure shows this force as a function of the position of the object. How much work does the force do as the object moves from 0 to 15 m?
A. 25 J B. 50 J C. 100 J D. 125 J E. 150 J