Roll Ramp Roll
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 EZ Access Portable Aluminum Scooter Wheelchair Roll Up Ramp 5 x 30  US $174.99
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 Roll A Ramp Short Support Stand for Ramps over 12 3612 S US $190.00
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 Roll A Ramp Long Support Stand for Ramps over 12 3612 L US $202.99
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 Roll A Ramp Load Bearing Approach Plate 36 3236 US $184.50
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 Roll A Ramp 3250 Quick Release pins to easily separate ramp US $499.89
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 Roll A Ramp Additional Ramp Link 1 x 36 31362 US $125.06
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 Roll A Ramp Quick Release Pins to Easily Separate Ramp 3250 US $22.50
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 Manual Folding Van Mounted Ramp by Roll A Ramp No Van Conversion Required US $1,495.00
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 9 Twin Track Roll A Ramp Roll up Folding Travel Ramp US $966.07
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 7 Twin Track Roll A Ramp Roll up Folding Travel Ramp US $793.62
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 8 Twin Track Roll A Ramp Roll up Folding Travel Ramp US $870.97
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 9 x 36 Roll A Ramp Roll up Folding Tailgate Ramp US $1,349.10
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 9 x 30 Roll A Ramp Roll up Folding Aluminum Ramp US $751.82
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 9 x 26 Roll A Ramp Roll up Folding Aluminum Ramp US $741.37
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 8 x 36 Roll A Ramp Roll up Lightweight Aluminum Ramp US $1,349.10
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 8 x 30 Roll A Ramp Roll up Lightweight Aluminum Ramp US $689.10
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 7 x 30 Roll A Ramp Roll up Folding Aluminum Ramp US $681.00
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 8 x 26 Roll A Ramp Roll up Folding Travel Ramp US $657.75
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 7 x 26 Roll A Ramp Roll up Folding Aluminum Ramp US $684.98
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 Roll A Ramp Twin Track Ramp 12 x 240 A11219A19 US $2,335.50
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 Roll A Ramp 26 Ramp 26 x 240 A12619A19 US $1,809.00
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 Roll A Ramp Manual Bi Fold System 36 MF 36 US $1,345.50
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 NEW Roll A Ramp TWIN TRACK 8 Ft Scooter WHEELCHAIR RAMP US $965.00
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 Roll A Ramp Seg Mount Bracket Pair 3150 US $37.80
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 Roll A Ramp Pickup Tailgate Brackets for Mounting to Flat Surface 3415 US $43.20
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 ROLL A RAMP Portable 8 Foot Scooter Wheelchair Ramp NEW US $795.00
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 NEW Roll A Ramp 7 Foot PORTABLE Scooter WHEELCHAIR RAMP US $715.00
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 NEW Roll A Ramp TWIN TRACK 9 Ft Scooter WHEELCHAIR RAMP US $1,465.95
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 NEW Roll A Ramp TWIN TRACK 7 Ft Scooter WHEELCHAIR RAMP US $1,239.99
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 Roll A Ramp Spacer for 12 Pair 8 3380 US $17.10
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 Roll A Ramp Non Load Bearing Approach Plate 36 A45237 36 US $76.50
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 Roll A Ramp Powered Mini Fold Ramp Pendant Cord MF1 US $2,425.50
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If 2 solid spheres roll down a ramp, 1 has twice the radius & mass than the other, which would win and why???
Since gravity pulls all things equally, the race should be a tie every time. The only thing that might affect the outcome would be friction from the surrounding air, which you haven't told us about. Since both objects are spheres I'm going to assume the air friction is the same for both.
(In a vacuum, a feather and a rock will fall at the same speed. Only the air affects the speed of the feather.)
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