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Can I Jump Rope Fast Enough To Stop The Rain?

newtboy jokingly says...

I got approximately 17.7 mach (I used a 4 ft handle to floor distance).
The shock waves from the sonic booms should clear the rain nicely.

moonsammy said:

Not sure if his claim that 800 revolutions per second would clear the rain, didn't check the numbers. But I did some rough math, and if that 800/s is accurate, the center of the rope would be traveling roughly mach 14.5! Would make a hell of a noise, I'd wager.

Mordhaus (Member Profile)

Cannon Shock Waves in Ultra Slow Motion

SpaceX Iridium 4 Launch from Alhambra, CA

BSR says...

I lived in Cape Canaveral for 35 years. I watched all but 5 shuttle launches and many Delta, Atlas and other rockets. Each unique in it's own way. This launch was spectacular in that the lighting helped illuminate the plume in a way that normally is unseen in a bright sky or total darkness.

Another cool effect when conditions are right during a launch is when a rocket breaks the sound barrier while penetrating thin clouds. It creates what's known as a Sun Dog. The shock wave creates a ripple effect that resembles ripples going across the surface of water. The effect at night can be illuminated by the rocket's bright plume rather than the sun.

Shockwave from huge explosion hits marine in Hummer turret

Volcanic Eruption of Mount Tavurvur (shock wave included)

deathcow says...

so minimally that far... this was pretty good from wiki:

Shock waves form when the speed of a fluid changes by more than the speed of sound.[3] At the region where this occurs sound waves travelling against the flow reach a point where they cannot travel any further upstream and the pressure progressively builds in that region, and a high pressure shock wave rapidly forms.

Shock waves are not conventional sound waves; a shock wave takes the form of a very sharp change in the gas properties on the order of a few mean free paths (roughly micrometers at atmospheric conditions) in thickness. Shock waves in air are heard as a loud "crack" or "snap" noise. Over longer distances a shock wave can change from a nonlinear wave into a linear wave, degenerating into a conventional sound wave as it heats the air and loses energy. The sound wave is heard as the familiar "thud" or "thump" of a sonic boom, commonly created by the supersonic flight of aircraft.

Volcanic Eruption of Mount Tavurvur (shock wave included)

Strobe Light filmed at 5 million fps by HyperVision HPV-X

oritteropo says...

It certainly is It's actually one of the major limiting factors when determining maximum power output of the lamp. If the power is too high, the shock wave can break the glass envelope.

CrushBug said:

Jeeze, is that a shock wave coming off the filament?

Strobe Light filmed at 5 million fps by HyperVision HPV-X

Walking from Mexico to Canada POV Video

Payback says...

I was worried they might be attacked by bears or mountain lions, but I guess they could just flex their calf muscles and the animals would be scared off by the resulting shock wave.

Star Trek: Deshaked

Luke's Change - Death Star Destruction Was an Inside Job

TheFreak says...

No mention at all of the doctoring of the video record of the Death Star Explosion.

Early video of the Death Star explosion showed no evidence of an explosive planar shock wave, or "Praxis Effect" emanating from the equator of the installation. This shock wave parralel to the equatorial trench is to be expected due to the rotational momentum of the massive artificial gravity devices employed by the installation at the equator. Yet no such Praxis shock wave is visible in the video created by the remote installation that first recorded the event.

Absence of the Praxis shock wave is only possible if the explosion occurred from several distributed points across the surface of the Installation, rather than from a single-point explosion at its center. The early video evidence is contrary to the results of the official investigation.

This early observation by skeptics becomes even more important due to the fact that this shock wave is 'clearly' visible in later released video. The video released following official investigation and engineering review of the incident. The official explanation that later came out in response to inquiries into this inconsistency are suspect. The panel of Imperial engineers claim that the effect was evident, though not apparent, and only became visible following restoration and enhancement of the video, as required for the investigation. This "enhancement", carried out prior to video re-release is suspicious, in and of itself, but the truely revealing factor is in the error made by those who would cover up the truth.

Inspection of the later video showing the Praxis shock wave shows a critical flaw: The angle of the planar shock wave is PERPENDICULAR to the equator of the Death Star. This is impossible and clearly reveals that the shock wave was later digitally added to the video as a cover-up!

You decide.

Momentum, Magnets & Metal Balls - Sixty Symbols

messenger says...

This thread has gotten me very curious to try all these things out for myself.

As far as equally weighted particles go, what you describe is not what we observe. We always see the same number of particles leave as came in, no matter their total momentum. A single particle going 1m/s ejects one particle also going 1m/s (I'm talking in ideal terms). A single particle going 2m/s doesn't release two particles going 1m/s, just one going 2m/s. The same particle going 100m/s likewise doesn't release 100 particles going 1m/s, nor 50 going 2m/s nor any other combination. As the force passes through the stationary particles, there's nothing to say what the mass or velocity of the striking particle was, just what the product of those two things was.

As for different sized particles, not having seen this done, if a solid (I mean a single piece, or welded together) 2kg particle came in at 1m/s, I predict a single 1kg particle would be ejected at 2m/s. My reason is the same as above: that when one ball strikes, the only information transmitted through the stationary particles is the total amount of force, not the velocity or mass of the striking object. Thus, the force transmitted through the stationary particles would be identical whether a 1kg ball struck at 2m/s or a 2kg ball struck at 1m/s. All this force is transmitted into the last ball which leaves with the same amount of force in the form of velocity as a factor of its mass, whatever that may be.

I think fusing the two balls together would fundamentally change their behaviour. I think when two loose balls hit together, the first one hits the stationary ones, bounces back towards the second ball which then stops, sending a second shock wave through the stationary particles, thus sending two signals very close together, and releasing two particles out the other side.

To continue the thought experiment, what if it were a 1.2kg particle striking a row of 1kg balls? I think it would be one particle going out at 1.2m/s, rather than 1 particle at 1m/s and a second at 0.2m/s or two of them together at 0.6m/s.>> ^heathen:

As you said momentum is mass velocity, and force is mass acceleration.
It's the mass of the particles entering that determines the mass of the particles leaving.
As the balls in a Newton's cradle all have equal mass it's tempting to restate that as the number of particles rather than the mass of the particles.
However if you designed a cradle to have four 1kg balls and one 2kg ball then swinging the 2kg ball would cause two 1kg balls to be displaced. (The same effect as taping or gluing two 1kg balls together.)
In a normal Newton's Cradle the acceleration, due to gravity, is constant.
The constant mass and constant acceleration cause the predictability, as the only energy lost is to air resistance and other negligibles such as sound or minimal compression of the balls on impact.
The forces introduced by the magnet scale inversely with distance, making the outcome a lot more unpredictable.

Dude.....You're TOO NEAR The Hou........Forget it

FA-18 "Super Hornet" Breaks Sound Barrier

siftbot says...

Tags for this video have been changed from 'f18, jet, airplane, speed, mach 1, shock wave, halo, supersonic, fly over' to 'f18, jet, airplane, speed, mach 1, shock wave, halo, supersonic, fly over, flyby' - edited by calvados



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