Steel Tripod
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 Two Long Hex D Ring Screw 1 4 Camera Tripod QR Plate Stainless Steel NEW $9.99 Time Remaining: 14d 12h 22m Buy It Now for only: $9.99 |
 3 8 stainless steel camera screw for quick release plate and tripod $2.99 Time Remaining: 4d 5h 46m Buy It Now for only: $4.50 |
 2 Steel D Ring Hinged Screw 3 8 for Camera Tripod QR Plate SS Stainless NEW $11.95 Time Remaining: 29d 11h 43m Buy It Now for only: $11.95 |
 New Single Long Hex D Ring Screw 1 4 Camera Tripod QR Plate Stainless Steel $5.99 Time Remaining: 14d 12h 13m Buy It Now for only: $5.99 |
 5 X Sunwayfoto Stainless Steel 1 4 to 3 8 Tripod Adapter Bushing TN 1 TN1 NEW $13.95 Time Remaining: 10d 13h Buy It Now for only: $13.95 |
 1 4 Stainless Steel Flat Head Screw for Camera Tripod QR Plate x 100 NEW $69.83 Time Remaining: 8d 16h 46m Buy It Now for only: $69.83 |
 2 x Male to Male 1 4 to 3 8 Tripod Steel Adapter QR Plate Camera Convertor NEW $5.97 Time Remaining: 11d 21h 42m Buy It Now for only: $5.97 |
 5 X Sunwayfoto Stainless Steel 1 4 for Tripod QR Screw CS 1 Hex Flat Slot NEW $13.50 Time Remaining: 12d 9h 41m Buy It Now for only: $13.50 |
 Steel D Ring Hinged Screw 3 8 for Camera Tripod QR Plate SS Stainless NEW $7.95 Time Remaining: 29d 11h 43m Buy It Now for only: $7.95 |
 10 x Male to Male 1 4 to 3 8 Tripod Steel Adapter QR Plate Camera Convertor $19.97 Time Remaining: 20h 55m Buy It Now for only: $19.97 |
 Steel Tripod Color White $40.00 Time Remaining: 8d 16h 22m Buy It Now for only: $40.00 |
 BENRO Steel Spikes Feet Toe Tripod Monopod 3 pcs fit Gitzo $9.50 Time Remaining: 4d 1h 42m Buy It Now for only: $9.50 |
 2 Steel Screw 1 4 for Camera Tripod QR Plate ideal for Manfrotto Sachtler $9.95 Time Remaining: 22d 22h 54m Buy It Now for only: $9.95 |
 8 New Screws Ideal for BOGEN 1 4 Steel Adapter Screw Tripod Head Mount $7.99 Time Remaining: 20d 22h 18m Buy It Now for only: $7.99 |
 Steel Screw 1 4 for Camera Tripod QR Plate ideal for Manfrotto Sachtler $6.85 Time Remaining: 22d 22h 54m Buy It Now for only: $6.85 |
 Pro Steel Mini Tripod for Sony DCR SX45 DCR SX65 SX85 $12.99 Time Remaining: 21d 18h 5m Buy It Now for only: $12.99 |
 One Nutted Reversible Tripod Post 1 4 3 8 Steel $6.99 Time Remaining: 9d 4h 33m Buy It Now for only: $6.99 |
 One Replacement Post Tripod 1 4 3 8 Steel NEW $6.99 Time Remaining: 9d 4h 33m Buy It Now for only: $6.99 |
 Pro Steel Mini Tripod for Sony HDR CX150 HDR CX110 $12.98 Time Remaining: 24d 21h 31m Buy It Now for only: $12.98 |
 Pro Steel Mini Tripod for Canon PowerShot G12 G11 G10 $12.98 Time Remaining: 3d 21h 41m Buy It Now for only: $12.98 |
 New Slave Ball Head Steel Mini Tripod Flash Kit $19.99 Time Remaining: 15d 14h 3m Buy It Now for only: $19.99 |
 3 8UNC and 1 4 UNC stainless steel screw for QR plate and tripod $5.88 Time Remaining: 5d 8h 16m Buy It Now for only: $10.00 |
 Benro Steel Spike Feet Toes for Benro Tripod 3 pcs fit Gitzo steel toe $9.40 Time Remaining: 25d 22h 31m Buy It Now for only: $9.40 |
 10 x Nutted Reversible Tripod Post 1 4 3 8 Metal Stainless Steel NEW $22.97 Time Remaining: 8d 19h 13m Buy It Now for only: $22.97 |
 Pro Steel Mini Tripod for Sony Handycam HDR XR550V $12.98 Time Remaining: 12d 19h 27m Buy It Now for only: $12.98 |
 2 Steel Screw 3 8 for Camera Tripod QR Plate ideal for Manfrotto Sachtler $9.95 Time Remaining: 22d 23h 22m Buy It Now for only: $9.95 |
 20 X Steel D Ring Screw 1 4 Camera Tripod QR NEW $59.00 Time Remaining: 2d 18h 12m Buy It Now for only: $59.00 |
 2 Steel Screw 1 4 for Tripod Head Clamp 4mm Hex NEW $6.45 Time Remaining: 18d 23h 31m Buy It Now for only: $6.45 |
 8 X 1 4 Assorted Steel SS Screw Adapter Set Kit For Tripod Head Mount NEW $9.95 Time Remaining: 13d 21h 24m Buy It Now for only: $9.95 |
 Steel Screw 3 8 for Camera Tripod QR Plate ideal for Manfrotto Sachtler $6.85 Time Remaining: 22d 23h 22m Buy It Now for only: $6.85 |
 3 8 Stainless Steel Flat Head Screw for Camera Tripod QR Plate x 100 NEW $69.83 Time Remaining: 8d 16h 46m Buy It Now for only: $69.83 |
 iOptron 1 Stainless Steel Tripod 8501 $44.00 Time Remaining: 12h 45m Buy It Now for only: $44.00 |
 Pro Steel Mini Tripod for Sony Handycam HDR CX550V $12.98 Time Remaining: 24d 21h 31m Buy It Now for only: $12.98 |
 Pro Steel Mini Tripod for Canon VIXIA HF S30 HF G10 $12.98 Time Remaining: 21d 16h 2m Buy It Now for only: $12.98 |
 precision made 3 8UNC + 1 4 UNC stainless steel screw for QR plate and tripod $10.00 Time Remaining: 2d 17h 19m Buy It Now for only: $10.00 |
 Pro Steel Mini Tripod for Sony HDR CX350V HDR XR350V $12.98 Time Remaining: 19h 16m Buy It Now for only: $12.98 |
 DI PLUS SK 215A CAMERA TRIPOD STAINLESS STEEL $34.99 Time Remaining: 17d 18h 36m Buy It Now for only: $34.99 |
 Benro Steel Spike Feet for Benro Tripod 3 pcs w Wrench $13.50 Time Remaining: 10d 11h 56m Buy It Now for only: $13.50 |
 Pro Steel Mini Tripod for Sony HDR CX300 HDR XR150 $12.98 Time Remaining: 24d 21h 31m Buy It Now for only: $12.98 |
 20 x Steel Screw 1 4 for Camera Tripod QR Plate ideal for Manfrotto Sachtler $37.40 Time Remaining: 23d 19h 21m Buy It Now for only: $37.40 |
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Gitzo G1220.129B3 Stainless Steel Spikes For Tripod (Set of 3) List Price: $67.00 Sale Price: $47.95 Used From: $39.45  |
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Gitzo Tripod Spikes - Set Of 3 G1220-129B3 |
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5 X Sunwayfoto Stainless Steel 1/4" to 3/8" Tripod Adapter / Bushing TN-1 TN1 Sale Price: $13.95 |
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5 pack. Use to convert a 1/4"-20 threaded post to a 3/8"-16 or to convert a 3/8"-16 thread socket to a 1/4"-20. Screwdriver slot for removal. 9mm in height. |
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D Shaft D-ring Screw 1/4" Camera Tripod Qr Stainless Steel (2-pack) Sale Price: $5.00 |
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D-Ring Screws,Precision made 1/4"-20 Stainless Steel (metal) Tripod screws,1/4" metal male thread with flat head screwdriver slot & hinged "D" Ring. 1/4"-20 screw for quick release plate.2 pieces pack. |
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8" Professional STEEL Table Top Tripod For The Nikon D5000, D3000 Digital SLR Cameras Sale Price: $4.99 |
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Don't be the invisible man (or woman) in your family photo album! Get yourself in the picture using your camera's self-timer and this professional steel tabletop tripod which has superior rubber tip legs provides extra stability... |
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Induro AT-214 Alloy AT Series 8M Tripod (Black) List Price: $220.00 Sale Price: $149.00 |
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The INDURO ALLOY 8M AT-214 tripod is made from the highest grade Aluminum Alloy and is designed to offer the uncompromising quality, strength and durability demanded by professionals and serious photographers, at a reasonable price... |
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8" Professional STEEL Table Top Tripod For The Canon EOS REBEL T3i (EOS 600D) Digital Camera List Price: $9.99 Sale Price: $4.99 |
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Don't be the invisible man (or woman) in your family photo album! Get yourself in the picture using your camera's self-timer and this professional steel tabletop tripod which has superior rubber tip legs provides extra stability... |
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tiltpod - always-ready micro tripod for compact digital cameras List Price: $14.95 Sale Price: $13.95 |
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Get the perfect shot with the always-ready tiltpod from Gomite. The world's smallest quick-connect magnetic micro "tripod". Attaches to the wrist strap of practically any compact camera or personal Flipcam-style video recorder for hands-free pictures and video even on uneven surfaces... |
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Fasten RT1 for Quick Release Plate List Price: $17.95 Sale Price: $17.95 Used From: $9.99 |
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Make your quick release plate R-Strap ready. Easily go from R-Strap to tripod or monopod. The FastenR-T1 (FR-T1) is the solution to using your favorite R-Strap with Manfrotto RC2 quick release plates. Strong... |
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Adorama Heavy Duty L-bracket with 2 Standard Flash Shoe Mounts Sale Price: $8.29 |
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Adorama Heavy Duty L-bracket designed to hold the camera vertically. It has 2 standard shoe mounts, allowing two units of any type of flash to be mounted. A flash bracket allows you to move your external flash away from the camera for better lighting and preventing red eye. |
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GoPro Suction Cup Mount for HERO Cameras List Price: $29.99 Sale Price: $28.49 |
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This is the suction cup that comes with the Motorsports HERO. Perfect if you own a Helmet HERO and want to add a suction cup mount to your aresenal. Attaches to kayaks, snowboards, surfboards, cars, you name it... |
Steel wire is bent in the shape of white strip on the surface of tennis ball?
http://alexandersemenov.tripod.com/ya/tnsb/index.htm
Mass of the wire is 20g and radius of the (imaginary) ball is 3cm.
Axis zz' is the axis of (rotation90+reflection) symmetry, and xx' is perpependicular to zz.
Moment of inertia of the wire Izz is 130 g cm².
What is moment of inertia of the wire Ixx?
The book says that exact shape of the strip does not matter. Its group of spatial symmetry plus the fact that all the mass is equidistant from the center is sufficient.
The diagram is easy to misconstrue and I also thought at first that the x and z axes were images of each other under a symmetry operation (so that I_xx would be the same as I_zz), but looking carefully at a tennis ball, only one of the three axes has the property that a rotation about that axis followed by a reflection across the perpendicular plane is a symmetry. So that clearly defines the z axis.
One way to distinguish the xy plane from the other two is that the wire passes through it four times but just two times for each of the other two planes. (It really doesn't look that way from the picture).
Let <> brackets represent the mass weighted average of their contents, so we can write:
I_zz = M
Clearly the symmetry property of the wire requires that
M
= 2*M
= 2I_xx + I_zz
-->
I_xx = (1/2)(M r^2 - I_zz)
= (1/2)(20*9 - 130) = 25g cm^2
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