How much further away from speaker must observer walk
An observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. How much further away from the speaker must the observer walk to hear a sound level of 50 dβ?
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The company would like to maintain ending merchandise inventories equal to 70% of the next month's cost of goods sold. Payment for merchandise is made in the month following the purchase.
A student exchanges the stock headphones (B1 = 89 dB) for her mp3 player for a new set that is louder (B2 = 94.5dB). If the first set produced a power of P = 0.5 W, how much power does the new set produce?
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The armature of a simple ac generator has 30 circular loops of wire, each with a radius of 10 cm. It is rotated with a frequency of 60Hz in a uniform magnetic field of 700 mT. What is the maximum emf induced in the loops?
Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna, taking 98 MHz as a typical FM frequency?
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Rachel Ray recently opened her own basket weaving studio. She sells finished baskets in addition to the raw materials needed by customers to weave baskets of their own.
Object 1 has a temperature of 95° C and object 2 has a temperature of 35° C. What is the ratio of the net power emitted by object 1 to that radiated by object 2?
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