Jul
27
You have your bicycle upside-down for repairs. The front wheel is free to rotate and is perfectly balanced…?
You have your bicycle upside-down for repairs. The front wheel is free to rotate and is perfectly balanced except for the 26-g valve stem. If the valve stem is 32 cm from the rotation axis and is located 26° below the horizontal, What is the magnitude of the resulting torque about the wheel’s axis?
τ = ____ N·m
Torque is the position vector crossed with the force vector, or τ = r x F, where r is the vector pointing from the axis to the point where the force is applied.
This is equal to rFsinθ, where θ is the angle between the force vector and the position vector.
So, in this case, F = mg, r = 0.32m, and θ = 90° – 26° = 64°.
So, τ = rFsinθ = 0.026kg*9.81m/s²*0.32m*sin(64°) = 0.073Nm.
Bicycle Maintenance & Repairs : How to Install a Threadless Stem for Your Bike
|
|
RACING BIKE ITALIAN MADE IN 80′s 22.2mm ITM ALLOY HANDLEBAR STEM 70mm SUIT FIXIE $15.79 |
|
|
Thomson Elite X4 Bike Stem 110mm x 31.8mm clamp x 10d, 180g $67.00 |
|
|
Vintage 1977 Schwinn Varsityy bicycle 10 speed ,Stem, goose neck antique ,bike $9.99 |
|
|
Black Answer DJ Threadless Mountain Bike Stem – 50mm x 31.8mm $24.95 |
|
|
Black Answer DJ Threadless Mountain Bike Stem – 50mm x 31.8mm $29.95 |
|
|
BICYCLE HANDLE BAR STEM SHIMS WEDGE FIT SCHWINN OTHERS $14.00 |
|
|
VINTAGE 1986 GT BIKE STEM WHITE SR JAPAN K-86 POST OLD SKOOL BMX FREESTYLE $19.99 |
|
|
Vintage Triumph bicycle stem bolt, 1960′s $1.56 |
|
|
CANNONDALE LEFTY XC3 SI STEM STEERER MOUNTAIN BIKE $59.00 |
|
|
Adjustable Alloy Road Bike Bicycle Stem 110mm 1 1/8 NEW $14.97 |
|
|
ITM VISIA ALLOY 1 1/8 ROAD BIKE STEM 120MM 31.8MM NEW $14.97 |
|
|
Extra Long Bike Bicycle Handlebar Stem 1″ 22.2 25.4mmNEW $9.97 |
|
|
KALLOY Road Bike Stem 90mm Ahead Aluminum 1 1/8″ NEW $2.97 |
|
|
NITERIDER HEADTRIP HEAD TRIP 10W CYCLING LIGHT w/ HELMET MOUNT MOUNTAIN BIKE $19.95 |
|
|
SCHWINN Handlebars, ‘S’ Stem, Safety/Brake Levers, Cables, Continental bicycle $29.99 |
|
|
Vintage SR Road Bike Stem $25.00 |
|
|
LOOK A5.1 Road Bike Pedals with FeeARC and Infini Resistance $0.99 |
|
|
► NOS WALD Gooseneck Stem fits Huffy Sears Murray AMF Muscle Bike Bicycle $19.69 |
|
|
Bearing Top Nut Lock Nut Pit Bike Fork Stem Bolt Demon Ghost CRF Thumpstar $8.61 |
|
|
BLACK STEEL MOUNTAIN BICYCLE STEM BIKE PARTS ST522 $9.99 |
|
|
BONTRAGER RACE LITE ROAD/MOUNTAIN BIKE ALLOY STEM 120MM 25.4 1-1/8 $35.00 |
|
|
3T FORGIE ALLOY ROAD BIKE STEM 130MM $9.99 |
|
|
BNWT, Never Used Bontrager Race XXX Lite Road Bike Carbon Fiber Stem, OBO $149.00 |
|
|
NEW PRO XCR OS Bicycle Stem 110mm 31.8 Shimano $55.00 |
|
|
New road / mountain bike carbon stem full carbon fiber bicycle stems 31.8*100mm $39.98 |
|
|
3T Mutant aluminum road bike stem 100mm length/zero rise $0.99 |
|
|
TRUVATIV Bike Cycling Stem 80mm x Ø25.4mm x 7º degree $13.90 |
|
|
Fuji 30° High Rise Road Bike Stem 1-1/8″ 110mm 26.0 Bar Clamp Black $24.95 |
|
|
Vintage Bicycle Wald Gooseneck Stem $8.99 |
|
|
BMX Mongoose Bicycle Stem, Wedge, Used $2.99 |
|
|
Vintage 3ttt Handlebar Competizione 42cm and 3ttt stem 120mm VGC L3 Road bike $89.99 |
|
|
Spare Part Metal Handle Stem Silver Tone for Bicycle $13.13 |
|
|
4x TRUCK CAR BIKE WHEEL TIRE TYRE AIR DUST VALVE STEM CAPS COVERS $1.95 |
|
|
Fit Bike Co. BMX Front load stem in Red (off a Van Homan Complete BMX Sig 2011) $32.99 |
|
|
TRUVATIV Bike Stem Ø25.4mm x 80mm x 7º $15.90 |
|
|
BBB Highsix Adjustable Ahead Bike Stem 25.4x130mm Black $34.59 |
|
|
BBB Highrise Silver Ahead Bike Stem 25.4 110mm BHS2411S $27.64 |
|
|
Universal Size Bike Mount Holder Bike HandleBar Stem Holder-Slim3 Medium White $24.79 |
|
|
New Light Bicycle Car Wheel Bike Tyre Valve Stem Cap Hot $0.99 |
|
|
Vintage Bicycle Schwinn Le Tour 70′s goose neck ,stem, 10 speed bike, $9.99 |
|
|
Universal Size Bike Mount Holder Bike HandleBar Stem Holder-Slim3 Medium Black $24.79 |
|
|
GUB Aluminium Stem Road/Mountain bike $14.78 |
|
|
Kenda Tube ATV Dirt Bike Tuff Tube Rubber Metal Valve Stem 100 /100-18 Each $16.95 |
|
|
Kenda Tube ATV Dirt Bike Tuff Tube Rubber Metal Valve Stem 90 /100-16 Each $16.95 |
|
|
NITTO NJ Pro NJS Steel Track Bike Stem – 120mm Length $129.99 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 120 mm black Bike $519.09 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 44 cm x 120 mm black Bike $519.09 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 44 cm x 130 mm black Bike $519.09 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 40 cm x 90 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 100 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 44 cm x 100 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 110 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 120 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 130 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 44 cm x 110 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 44 cm x 120 mm white Bike $548.75 |
|
|
PRO Stealth EVO UD carbon handle bar and stem compact 42 cm x 130 mm white Bike $584.70 |
|
|
Alloy Drop In Integrated Threadless Headset 1-1/8″ 41mm Green Road Bike New $24.99 |
|
|
Alloy Drop In Integrated Threadless Headset 1-1/8″ 42mm Blue Road Bike New $24.99 |
|
|
New TPMS Bike Tire Pressure Monitor Presta Valve Stem Cap Indicator 50-80psi X2 $6.95 |
|
|
Alloy Drop In Integrated Threadless Headset 1-1/8″ 41mm Blue Road Bike New $24.99 |
|
|
2 x BIKE TYRE WHEEL VALVE STEM CAP LED TIRE LIGHT RD $5.99 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Pink $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Blue $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Orange $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – White $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Purple $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Green $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Yellow $32.29 |
|
|
Bike Mount Holder For iPhone 3GS and 4S Only Bike Handle Bar Stem Mount – Black $32.29 |
|
|
Race Face Cadence 120mm Road Bike Stem 31.8mm 6º NEW $0.95 |
|
|
Nitto Jaguar Track Bike Stem, Pista or Fixed Gear, 130mm, Steel. NJS $75.00 |
|
|
M.T.B Alloy Stem 22.2mm PINK Bicycle,Bike,Cycling Cruiser $16.67 |
|
|
M.T.B Alloy Stem 22.2mm GREEN Bicycle,Bike,Cycling Cruiser $16.67 |
|
|
M.T.B Alloy Stem 22.2mm WHITE Bicycle,Bike,Cycling Cruiser $16.67 |
|
|
PINARELLO Bicycle Fork Stem Bike Headset Top Cap 1-1/8″ 1 1/8 $9.99 |
|
|
1995 Schwinn Phantom Bicycle AS Gooseneck Stem Wedge Bolt $22.00 |
|
|
STEM ROAD Bike 6061 AL 110g 90mm SILVER +0 rise New $8.90 |
|
|
New MTB Bicycle Bike Riser Ahead Stem 1″ x 135mm 40° Black $14.99 |
|
|
FSA OS-99 CSI 3K Carbon Road Bike Stem 100 x 31.8 NEW $191.95 |
|
|
Huge Lot of Stem Guard A MUST-HAVE 4 BIKE RESELLERS! 4 Safely Shipping bicycles! $4.95 |
|
|
Specialized S-Works Pro-Set, 31.8mm, carbon road, long stem bike $79.99 |
|
|
Vintage SHIMANO SIS Road Bicycle Six 6 Speed Handlebar-Stem Mounted Shifters $10.00 |
|
|
F3 POLISHED MTB HANDLEBAR bike STEM 25.4 x1 1/8 ” 130mm FREE SHIP MAINLAND US $9.90 |
|
|
New 2 Bicycle Bike Tyre Wheel LED Valve Cap Stem Light $0.10 |
|
|
110mmx400mm full carbon integrated handlebar&stem for road bike $119.00 |
|
|
PAIR OF MOTORCYCLE BIKE TIRE WHEEL VALVE STEM CAPS GRENADE STYLE RIM DECORATION $5.99 |
|
|
100mmx420mm cycling handlebar, carbon road bike integrated handlebar with stem $119.00 |
|
|
Mountain Road Bike Stem Pearl White (NEW) CNC Technology Bicycle Handlebar $4.99 |
|
|
THOMSON Elite X4 Bike Stem 31.8 x 120mm 10° Black $35.00 |
|
|
Deda Zero 100 Servizio Corse Cycling Stem White 110 Titanium 82 degree Road Bike $69.99 |
|
|
NEW Truvativ Stylo World Cup Stem // 120mm 5° 31.8mm Mountain MTB Bike Cycling $0.99 |
|
|
Kestral Talon Carbon 57cm Road Bike Frameset Frame Fork Seatpost,stem,headset $599.99 |
|
|
SHIMANO PRO XCR OS MOUNTAIN BIKE MTB STEM 31.8MM X 90MM $86.95 |
|
|
SHIMANO PRO VIBE 7S BICYCLE RACE BIKE STEM 100MM WHITE $91.95 |
|
|
Time Monolink Carbon Stem 110 mm High Modulus Road Bike Light Weight Stem $41.00 |
|
|
SHIMANO PRO VIBE 7S BICYCLE RACE BIKE STEM 80MM WHITE $94.99 |
|
|
110mm FSA OS99 3k Carbon Fiber Road Bike Stem 31.8 New! $36.00 |
|
|
120mm FSA OS99 3k Carbon Fiber Road Bike Stem 31.8 New! $20.50 |
|
|
80mm FSA OS99 3k Carbon Fiber Road Bike Stem 31.8 New!! $20.50 |
|
|
Delta Cycle Corp Smartphone Mount for Bikes $14.40 Bike mount for most smart phones… |
|
|
Reusable Decoration Wall Sticker Decal – Perfect Sakura Blossoms $4.23 Become an interior decorator and transform your living space from ordinary to extraordinary with these unique stickers! With these stickers you’ll be sure to add plenty of color, depth, fun, and individuality apart from the average home. You can adorn the interior walls and windows of your home, bathroom, office, nursery, dorm, or store. Get creative and apply them to furniture, such as your refri… |
|
|
Goal0 90401 Rockout Speaker $26.14 Hit the trails, boulder or water and share hours of high quality sound with fellow trekkers. The Rock-Out pumps sound from your iPod, mp3, mp4 and other audio devices through its integrated speakers. Simply plug the Rock-Out into the headphone or audio jack of your device and hit play. Its rugged and portable design will keep the tunes going whether mounted to a bike stem, backpack or climbing har… |
|
|
463 – Universal Air Daddy Pump Adapter $11.99 The Universal Pump Adapter speeds inflation of exercise balls.The valve stem is compatible with gas station air hoses, air compressors and bicycle pumps. Includes needle adapter…. |
|
|
iBike iPro Power Meter with Wireless Stem Mount iPro Computer, USB Adapter for Downloads, 3 CR2032 Batteries, Wireless Stem mount, Assembly Hardware, ANT+ HR Strap, ANT+ Wireless Combined Speed/Cadence Sensor, Cadence Magnet, Speed Magnet, Zip Ties, DVD with iBike Software (Win/Mac), Trial Version of Cycling Peaks WKO+… |
|
|
Garmin Bike mount, quick release, quarter turn $5.77 Use this replacement bike mount to mount your Edge 500 to your bicycle’s stem or handlebars. Includes bike mount rubber disc and elastic bands. Product : GARMIN QUARTER TURN BIKE MOUNT FOR EDGE 500 Manufacturer : GARMIN PARTS Manufacturer Part No : 010-11430-00 UPC : 753759100322… |
|
|
Garmin Edge Handle Bar Mount $5.75 Can be used either as a handlebar or stem mountTo change between handlebar and stem mounts, be sure to first remove the zip ties. Change the orientation of the two pieces and reinstall zip tiesWorks for all Edge models including the 205, 305, 605, and 705… |
|
|
Satechi CR-3800 Universal Bicycle Holder Wrench Mount for iPhone 4S, 4, 3GS, 3G, BlackBerry Torch, HTC EVO, DROID, Samsung EPIC, Galaxy S II, Galaxy Note $29.99 The Satechi CR-3800 lets you attach your iPhone , iPod Touch, BlackBerry, HTC, and most other cell phones to your bike’s handlebars so you can track your GPS position, your speed, or distance travelled, while you ride. The Satechi CR-3800 is always within easy reach, safe and convenient. It features an extra secure mount that has adjustable pivoting action: up and down, left and right. The Satechi… |
|
|
Topeak Small Handy Phone Pack $9.37 Topeak offers a great cell phone bag to take phones, sunglasses, or a pen on the ride.Fast, easy attachment and removal on any tube with the included QuickClick band clampItem SpecificationsColorBlack… |
|
|
Topeak PDA Phone Pack $12.99 BAG TOPEAK PHONE PACK PDA II BLK… |
