Magnitude-direction of the sum of momentum of two joggers
The 85-kg jogger is heading due east with a speed of 2.5 m/s. A 55-kg jogger is heading 24° north of east with a speed of 3.7 m/s. Determine the magnitude and direction of the sum of momentum of the two joggers.
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The glass window is installed in the window space and the intensity level of the sound entering via the window is decreased from 72 dB to 47 dB. The factor, by which the acoustic power entering the chamber is decreased by the glass window, is near
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