Interference of Waves in a Pool: Still Surface & Heating Effects

AI Thread Summary
In a pool with two wave machines operating in opposite phases, it is theoretically possible to create a still surface through destructive interference. However, even if the surface appears calm, the energy from the wave machines does not disappear; it is transformed rather than lost. The energy contributes to the formation of standing waves, where certain points remain stationary while others oscillate vertically. In an ideal medium without thermal motion, the energy would not convert to heat, but in real conditions, some energy inevitably becomes thermal energy. Therefore, while a still surface can be achieved, the wave energy still impacts the water's temperature.
philrainey
Messages
88
Reaction score
0
I'm trying to increase my understanding of what happens to waves with interference so I'll ask the following question to try and do so.
If one had a pool of water with a wave machine pulling the side in and out all along one side and an identical wave machine on the other side working in another phrase can it be possible to have a still surface on the pool, and if you can does the energy from the wave machines still heat up the water just as much?
 
Physics news on Phys.org
No. Your energetic argument is enough, I think. The equations describing wave motion would work in an ideal, continuous medium with no thermal motion. In that case there would be no mechanism to convert the ordered wave energy into disordered thermal energy, so where would the energy go? The best you can do is a standing wave, where some points on the surface are stationary, but the parts in between go up and down without appearing to move horizontally.
 
Hello everyone, Consider the problem in which a car is told to travel at 30 km/h for L kilometers and then at 60 km/h for another L kilometers. Next, you are asked to determine the average speed. My question is: although we know that the average speed in this case is the harmonic mean of the two speeds, is it also possible to state that the average speed over this 2L-kilometer stretch can be obtained as a weighted average of the two speeds? Best regards, DaTario
The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
Back
Top