Frequency of the reflected ultrasonic echo
A bat flying straight toward a wall at 11m/s emits a pulse at 60kHz. What is the frequency of the reflected ultrasonic echo wave reaching a stationary observe standing under the bat? Take the speed of sound to be 341m/s.
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Susan Sweets is a 40 percent shareholder in Acclaim Inc., a theatrical supplies company. She transfers a fully depreciated car with a value of $2,000 to the corporation, but does not receive any consideration for it.
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A juvenile elephant has a mass of 300kg. He wishes to fly using his very large ears. If the air speed on top of his ears is 30m/s and the speed below his ears is 22m/s, find the total surface area of his two ears.
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