I don’t know what you mean, but the ball must be going at least as fast as the clubhead unless the ball passes backwards through the club and comes out the other side. Anyway, the cite I gave earlier quoted a 163 mph clubhead speed giving a ball speed of 210 mph.
I’m no harness racing expert by any means, but I was under the impression that the whip is used to physically strike the horses, to stimulate them to run faster. If this is true, it would seem that the head of this very short whip must be moving at speeds well down into the subsonic range; a piece of leather moving over 700 mph would seemingly slice right through the poor critter’s hide.
With regard to lacrosse: If the fastest pitches in baseball are hovering around 105 mph, it would seem that by comparison, with the greatly increased moment arm of the crosse, coupled with the whippy flexibility of the head, speeds well in excess of 110 mph ought to be possible–especially when one considers that BOTH hands are being used, allowing for recruitment of more of the body’s muscles. This seems true (just speculating based on experience and observation) even taking into account the additional speed of the baseball provided by the height of the pitcher’s mound.
Well, of course the clubhead slows down after contact with the ball!
I know the club is well below 1 (.83), so unless the ball has a far greater than 1, it’s not as you say and your cite is wrong.
At any rate, it doesn’t matter because that supersonic whip crack has got the club head by about 500+ mph. Good one QED.
Sorry but you can’t do that in a frame of reference that is motionless in respect to the wall. The frame of reference would have to be motionless with respect to the ball when the ball is just about to hit the wall. Hence when the ball hits the wall the wall travels through the frame of reference at speed of ball v[sub]b[/sub] whilst the ball changes direction and now has a maximum speed relative to the frame of reference of 2v[sub]b[/sub].
You can then see that the speed of the ball relative to the wall is at most 2v[sub]b[/sub] - v[sub]b[/sub], so it can bounce no faster than its speed on hitting the wall relative to the wall.
Since the supersonic speed is acheived at such a small part of the whip and for such as small distance, it would be impossible to time it perfectly to hit the horse at the exact moment of supersonic speed. The horse on average would only feel a speed of 100mph or so. This is my WAG.
In jockey racing the small whip (I’d call it a crop) strikes the horse. The crop’s not meant to be cracked.
In harness racing, the whip is cracked near the horses to encourage (i.e., scare) the horses, not to actually strike them with it. Although, the horses have probably been struck with a crack once or twice in their life so that they learn to fear the crack.
Whether the crack of a whip breaks skin depends on the length and weight of the whip. Harness whips are rather skinny and light.
And, from what I’ve seen, they might also be striking the horse with a non-crack whipping, too.
I have no hard citations on this, sorry. I’d be willing to be corrected by someone in the biz.
Peace.
It doesn’t matter what the clubhead does after contact - the ball is already on its way. Anyway, here is a much more technical article, including coefficients of restitution. Note that in all examples the ball speed is much higher than the club speed.
It used to be a Christian running from a lion in Rome, but that sport was outlawed many years ago.
I pine for the old days.
twice the wall speed…he he
sorry
<Physics hijack…>
Walls not only have ears, they have speed as well
Since all speed (and velocity, which is speed with a direction) is relitive, just dependent on the frame of refference.
</Physics hijack>
crazy grady surely it would be the lions that were faster, wouldn’t be much of a spectator sport otherwise.
Does anyone know if a whip will crack only as part of it passes the sound barrier?
As I understand it, only the tip of the whip breaches the sound barrier, so when a whip is cracking, only part of it (the tip) pass the sound barrier.
Hey Batman Beyond had a game of jai alai in it - the moral was don’t use drugs or you’ll become a servant of Satan in Tennis Shoes. Or something.
Anyway, nothing except a thrown or kicked ball/object counts according to the rules. Machines not allowed so everything that gives leverage like a hockey stick or a golf club is out.
My vote is for the rim of a well-spun dime on a table. Hmm, how to figure out the velocity on the edge… only way to know revolutions per second is with a high speed camera or by the frequency of sound generated by the spinning… durr. I should know how to figure this out.
I’ll stick with the professional baseball fastball.
Riders don’t use whips, they use crops. You cannot make a crop “crack” like a bullwhip. No part of a crop ever exceeds the sound barrier.
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A larger coin will produce faster speeds at the outer edges.
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Since there’s no mini sonic boom like the crack of a whip when you spin a coin, I don’t think it will be in contention for the fastest object yet discussed.
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I don’t think spinning coins fits in with the OP parameter that it has to be sports related.
Another way to measure the speed of a repetitively fast object is with an adjustable stroboscope.
Peace.