OK here's another one - Where will the ball go?

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OK here's another one - Where will the ball go?

Postby LarryK on Thu Dec 14, 2006 6:36 am

Conditions:
1. In a vacuum.
2. Normal gravity.
3. Clubhead speed 120 mph.
4. Earth is spinning in the same direction of the ball at the same relative speed.
Question: Will the ball go anywhere?

Gawd, this is fun. Nothing better to do. Have another drink. :roll:
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Postby JoeSmith on Thu Dec 14, 2006 9:08 am

Probably out of bounds Larry.
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Postby Freefaller on Thu Dec 14, 2006 9:24 am

Is it a Kenmore or Phillips vacuum? :wink:
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Postby DavidCass on Thu Dec 14, 2006 10:27 am

Eureka
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Postby Cuber on Thu Dec 14, 2006 10:30 am

What club was being used to generate the 120 mph of clubhead speed and what type of swing was being used ... PS, RTS or Classic?
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Postby DennisHarris on Thu Dec 14, 2006 2:01 pm

Who cares these brain teasers ..... are just to ..... awe heck ..... just pour me another Budweiser, I'll watch the tube and let you all figure it out.
Life is to short, so always eat your dessert first! :)
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Postby Larry_Warrilow on Fri Dec 15, 2006 1:15 pm

in a vacuum in normal gravity, the ball will go forward, but without any aerodynamic lift from the interaction between air and the spinning ball's dimple pattern, it won't go as far and will barely get off the ground. the earths rotation has little to do with the problem at this scale. the ball will have the same inertia at all latitudes. lw
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Postby gunner on Fri Dec 15, 2006 1:34 pm

Larry my turn

Nowhere he didn’t swing.

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Postby Vibes on Fri Dec 15, 2006 1:38 pm

With a club head speed of 120mph probably up into his throat ( Very painful ) lol
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Postby Westview on Sat Aug 04, 2007 6:07 pm

I think the ball will not "appear" to go anywhere because if the ball and the rotation of the earth are travelling at the same speed, then ball would be in asynchronous orbit.

Eventually gravity will lower the ball angle, then it would appear the ball was actually moving backward slightly.
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Postby tryandtyoneon on Sat Aug 04, 2007 6:22 pm

Somebody had too much time on their hands today
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Postby Westview on Sat Aug 04, 2007 6:45 pm

tryandtyoneon wrote:Somebody had too much time on their hands today


Yeah I really should get a second job. Anybody hiring out there?
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Postby Bassmaster on Sat Aug 04, 2007 6:47 pm

Hey Larry, With a Graphite USA 6'6" medium heavy rod with a quick tip and casting a 3/8 oz Pop R topwater bait, I can get 156' cast. With or without a vacuum. Dirt Devils a good one. :D
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Re: OK here's another one - Where will the ball go?

Postby HeavySwinger on Mon Aug 06, 2007 5:45 pm

LarryK wrote:Conditions:
1. In a vacuum.
2. Normal gravity.
3. Clubhead speed 120 mph.
4. Earth is spinning in the same direction of the ball at the same relative speed.
Question: Will the ball go anywhere?

Gawd, this is fun. Nothing better to do. Have another drink. :roll:

I'm afraid HeavySwinger knows the answer. OK, first we figure out how fast the ball comes off the club - but first we make some assumptions: the coefficient of restitution of 1.67, mass of ball 1.62 ounces, and 180 gram mass of driver (6.34 oz). Also assume the club head speed is generated by a golfer wearing breathing apparatus standing on the earth so the earth's rotation has negligible effect on the problem and the answer will be given relative to the tee planted in the earth. The loft of the driver we use will be 7 degrees and our golfer will deliver a flat swing to the ball which is neither descending or rising. Using our secret formula, we find the ball velocity relative to the tee is 156 MPH travelling upwards at a 14 degree angle. Now if you run this through some physics equations assuming flat ground, you will get a distance of 255 yards not including roll. If I had the equation for ball climb angle considering the coefficient of restitution and the coefficient of friction of the ball against the club, I could give you a more accurate answer. :D
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Re: OK here's another one - Where will the ball go?

Postby BruceWallace on Mon Aug 06, 2007 8:16 pm

HeavySwinger wrote:
LarryK wrote:Conditions:
1. In a vacuum.
2. Normal gravity.
3. Clubhead speed 120 mph.
4. Earth is spinning in the same direction of the ball at the same relative speed.
Question: Will the ball go anywhere?

Gawd, this is fun. Nothing better to do. Have another drink. :roll:

I'm afraid HeavySwinger knows the answer. OK, first we figure out how fast the ball comes off the club - but first we make some assumptions: the coefficient of restitution of 1.67, mass of ball 1.62 ounces, and 180 gram mass of driver (6.34 oz). Also assume the club head speed is generated by a golfer wearing breathing apparatus standing on the earth so the earth's rotation has negligible effect on the problem and the answer will be given relative to the tee planted in the earth. The loft of the driver we use will be 7 degrees and our golfer will deliver a flat swing to the ball which is neither descending or rising. Using our secret formula, we find the ball velocity relative to the tee is 156 MPH travelling upwards at a 14 degree angle. Now if you run this through some physics equations assuming flat ground, you will get a distance of 255 yards not including roll. If I had the equation for ball climb angle considering the coefficient of restitution and the coefficient of friction of the ball against the club, I could give you a more accurate answer. :D


D-a-m-n-e-d old RTS'ers always get it right. :D :D :P :P :)
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