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

Physics & Space Science

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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?

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As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and

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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?

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Physics & Space Science