If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A) 67 dB
B) 13 dB
C) 44 dB
D) 88 dB
D
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The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
a. The universe is expanding. b. Galaxies repel each other like magnets. c. Our galaxy lies near the center of the universe.
Is it possible for an object to have a velocity of zero and a numerical value for acceleration? Justify your answer with an example
The Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is about 1,300 watts per square meter
Determine the apparent brightness we would measure for the Sun if we were located half the earth's distance from the Sun.
High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact