Physics, 07.12.2019 07:31 hudsonlilliana
The motion detector used in a physics lab sends and receives 39 khz ultrasonic pulses. a pulse goes out, reflects off the object being measured, and returns to the detector. the lab temperature is 20 c. a) what is the wavelength of the waves emitted by the motion detector? ) how long does it take for a pulse that reflects off an object 2.2 {\rm m} away to make a round trip? ms
Answers: 3
Physics, 22.06.2019 21:10, bri9263
Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.
Answers: 2
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