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Here is a fun effect. I wonder if it has been described previously, given how simple it is to reproduce. I remember seeing similar effects with an empty plastic bag, spinning midair on the side of an air updraft.
Experience Hydrodynamic Levitation: A Simple yet Mesmerizing Effect
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AI Thread Summary
Hydrodynamic levitation is an intriguing phenomenon that can be easily reproduced, sparking curiosity about its prior documentation. Participants recall similar effects, such as a plastic bag spinning in midair due to an air updraft. The discussion highlights variations in the method, noting that while one example used a mostly vertical water jet, others have successfully employed angled air jets. This versatility in technique demonstrates the simplicity and appeal of the effect. Overall, the conversation emphasizes the captivating nature of hydrodynamic levitation.
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?
Hello!
I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below.
Here is how I wrote the condition of equilibrium forces:
$$
\begin{cases}
F_{g\parallel}=F_{t1}+F_{t2}, \\
F_{g\perp}=F_{r1}+F_{r2}
\end{cases}.
$$
On the other hand...
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