The Doppler shift of ultrasonic waves can measure the speed of blood in an artery. If the frequency of the stationary source is 95.0 kHz and the reflected sound has a Doppler shift of 210 Hz, what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s.)
a. 1.0 m/s
b. 1.7 m/s
c. 3.3 m/s
d. 3.9 m/s
e. 6.5 m/s
b
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Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s and just after is 3.5 m/s. If the ball is in contact with the floor for 0.050 s, what is the magnitude of the average force applied by the floor on the ball?
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Some power plants extract energy from the warm ocean currents. A major disadvantage to these power plants is that
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