A concave mirror will produce
a. only inverted images.
b. real or virtual images.
c. only virtual images.
d. only real images.
b
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What is the primary topic of study in quantum mechanics?
A) subatomic particles and the forces with which they interact B) the role played by atoms in astronomy C) the mechanical movements of the heavens D) the role of relativity in astronomy
A bullet is dropped into a river from a very high bridge at the same time as another bullet is fired straight downward from a rifle. Neglecting air resistance, the acceleration just before striking the water is
A) greater for the dropped bullet. B) greater for the fired bullet. C) the same for each bullet. D) none of the above
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz
After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s. A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz
Which of the following has the greater weight?
1) 1 kilogram of gold 2) 1 kilogram of feathers 3) both weigh the same in the same locality This follows from the fact that 4) gold is more compact than feathers. 5) weight and mass are directly proportional to each other.