Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?
a. virtual, upright, and magnification greater than one
b. virtual, upright, and magnification less than one
c. real, inverted, and magnification greater than one
d. real, inverted, and magnification less than one
C
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____________________ is a measure of the light energy that hits one square meter in one second
Fill in the blank(s) with correct word
A pulley system can
A) change the direction of a force. B) multiply a force. C) both of these D) none of the above
Newton concluded that a force from the Earth had to act on the moon because
a. a force is needed to keep the moon in motion in its orbit. b. a force is needed to pull the moon outward. c. a force is needed to accelerate the moon toward Earth away from straight-line motion. d. the moon moved at a constant velocity in a straight line. e. all of the above
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.