An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1
b. 2
c. 1/2
d. 1/4
e. ?2
b
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Suppose we take a disk of radius R and remove the material from r = 0 to r = R, making a hole at the center of the disk. Note that this decreases the mass of the disk. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object. B. The value of ? will be smaller for the new object. C. The value of ? is the same for both objects. D. We need to know the disk’s thickness to answer.
As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and
A) rotates slower. B) rotates at the same speed. C) rotates faster. D) cannot rotate.
A battery has an internal resistance of 4.0 W. Which of the following load resistors would have the most power delivered to it when connected across the battery?
a. 1.4 W b. 2.0 W c. 4.0 W d. 8.0 W e. 16 W