Drag Ball
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 WF570H Pro Camera Tripod Action Drag Ball Head $29.98 Time Remaining: 2d 16h 56m Buy It Now for only: $29.98 |
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 WF570H Pro Studio Camera Tripod Action Drag Ball Head MaxLoad 3Kg 66Lb $29.98 Time Remaining: 15d 18h 26m Buy It Now for only: $29.98 |
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 WF570H Pro Photo Studio Camera Tripod Action Drag Ball Head $29.98 Time Remaining: 5d 18h 26m Buy It Now for only: $29.98 |
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DMKFoto Fancier 6664 PRO Action Fluid Drag Ball Head List Price: $79.99 Sale Price: $39.99  |
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The load capacity of the head is 11 lbs.Screw size: 1/4 inch for camera; 3/8 inch for tripods (we can provide adapter to fit 1/4 inch pods). The quick release plate system is universal, compatible to all major brands, including the most popular Manfrotto 3157N... |
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Ravelli AVT Professional 67" Video Camera Tripod with Fluid Drag Head List Price: $199.00 Sale Price: $73.99 |
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The Ravelli AVT is constructed of pressure treated aluminum and is unrivalled in stability. This tripod incorporates a unique center brace strut system, reliable quick-action leg locks, non-rollback center column, and rubberized feet with retractable metal spikes... |
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Ravelli AVTP Professional 55" 75mm Video Camera Tripod with Fluid Drag Head Sale Price: $149.89 Used From: $320.00 |
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The Ravelli AVTP is a complete Professional 75mm Video Tripod including legs, mid-level spreader, dual fluid head and carry bag. The legs are a 3-Segment Interlocking Crutch-Type design with a mid-level spreader providing oustanding stability for Video Cameras up to 27lbs... |
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Pro Heavy Duty Ball Head Quick Release Photo Ball Head Tripod Grip Action Ball Head for Gitzo Manfroto by Fancier 6664H Sale Price: $49.99 |
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This is a high quality pro ball head with calibrated tension control for smooth precision movement. Independent control for pan and tilt movement. This ball head is made from the latest metal (aluminum alloy) technology that provides super strong and sturdy construction and yet weighs only 1-1/4 lbs... |
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Induro BHD2 Ballhead (Black) List Price: $290.00 Sale Price: $170.00 Used From: $160.00 |
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Induro has brought the professional ballhead to a new level. The new BHD2 dual-action ballhead offers increased load capacities, large ergonomic locking knobs, adjustable drag and tension control, independent panning control and much more... |
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Fancier Tripod Dolly Video Tripod Dolly Heavy Duty Build With Carrying Case By Fancier FT600 Sale Price: $34.99 |
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Heavy duty professional quality. Unique, single action leg locks with adjustable cycolac grips that hold any and all type tripod legs regardless of configuration or style. Folds to a compact 18" for storage and transport... |
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DMKFoto Fancier 6665 PRO Action Fluid Drag Ball Head List Price: $99.99 Sale Price: $56.99 |
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This is a high quality pro ball head with calibrated tension control for smooth precision movement. Independent control for pan and tilt movement.This ball head is made from the latest metal (aluminum alloy) technology that provides super strong and sturdy construction and yet weighs only 1-3/4 lbs... |
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ePhoto Professional Video Camera Fluid Drag Tripod Head by ePhoto INC 717AH Sale Price: $79.99 |
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Professional Video Camera Fluid Drag Tripod Head by ePhoto INC 717AH |
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Manfrotto 504HD,546BK Video Tripod Kit with 504HD Head and 546 Tripod (Black) Sale Price: $799.89 |
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This kit is the perfect choice for all of your video applications. The 504HD offers a perfect balance between design and performance. The bridge design improves the head’s rigidity, and its PAN friction control is fast, simple to fine-tune and protected from knocks... |
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Manfrotto 504HD Video Head (Black) Sale Price: $369.90 Used From: $315.91 |
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The 504HD offers a perfect balance between design and performance. The bridge design improves the head’s rigidity, and its PAN friction control is fast, simple to fine-tune and protected from knocks... |
How hard you should kick soccer ball to propell it 100 m above the ground?
Air drag is proportional to velcoity squared and terminal velocity of the ball is 25 m/s.
What must be initaial vertical velocity of the ball?
At terminal conditions, mg = k*25^2
So mg/k = 25^2
Consider the case of the ball moving upward with velocity, v.
m*dv/dt = -mg - kv^2
Write the LHS = m*dv/dx * dx/dt = m*v*dv/dx
Separating variables and rearranging
1/g * mg/k * v*dv / [mg/k + v^2] = -dx
625/(2g) * 2v*dv / (625+v^2) = -dx
Integrating between v = v0 and v = 0 and x = 0 and x = 100
625 / (2g) * ln[625 / (625+v0^2)] = -100
v0 = 117.5 m/s
44.3 m/s is the required speed in the absence of drag. So it makes sense that the actual speed is higher.
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