Physics, 25.12.2019 00:31 davidgarcia522083
(a) the roof of a large arena, with a weight of 430 kn, is lifted by 15 cm so that it can be centered. how much work is done on the roof by the forces making the lift? (b) in 1960 a tampa, florida, mother reportedly raised one end of a car that had fallen onto her son when a jack failed. if her panic lift effectively raised 4000 n (about 1/4 of the car's weight) by 5 cm, how much work did her force do on the car?
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The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz
Answers: 2
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