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See Weight for detail of mass/weight distinction and conversion. ... pound per square foot: psf ≡ 1 lbf/ft 2: ≈ 47.880 26 Pa [33] pound per square inch: psi
New Mail Ladies Safety bicycle, circa 1891, with solid rubber tires A tubed, clincher tire showing the inner tube protruding between the tire and the rim Tubular tire rolled from rim to show glue between them Clincher cross section schematic with 1: rim, 2: rim strip, 3: rim braking surface, 4: bead core, 5: inner tube, 6: casing, 7: tread
square foot: sqft (sqfoot) sq ft long code "sqfoot" outputs square foot (and never feet) 1.0 sq ft (0.093 m 2) sqft m2 (sqfoot m2) square inch: sqin sq in 1.0 sq in (6.5 cm 2) sqin cm2; Other: square nautical mile: sqnmi sq nmi 1.0 sq nmi (3.4 km 2; 1.3 sq mi) dunam: dunam (none) For alternative spellings and definitions see the full list
In effect, the formula reduces the legal weight limit for shorter trucks with fewer axles (see table below). For example, a 25-foot (7.6 m) three-axle dump truck would have a gross weight limit of 54,500 pounds (24,700 kg), instead of 80,000 pounds (36,000 kg), which is the standard weight limit for 63-foot (19.2 m) five-axle tractor-trailer. [1]
85 – the load index, a maximum of 515 kg (1,135 lb) per tire in this case; H – the speed index, this means the maximum permitted speed, here 210 km/h (130 mph) The tires on a Hummer H1 might be labeled: 37X12.5R17LT. 37 – the tire is 37 in (940 mm) in diameter; 12.5 – the tire has a cross section of 12.5 in (320 mm)
The ground pressure of motorized vehicles is often compared with the ground pressure of a human foot, which can be 60 – 80 kPa while walking or as much as 13 MPa for a person in spike heels. [ 3 ] Increasing the size of the contact area on the ground (the footprint ) in relation to the weight decreases the unit ground pressure.
The fitness and cadence of the rider, bicycle tire pressure and sizes, gear ratios, slope of the terrain affect the overall speed of the rider. A person pedalling with 100 W power can achieve 5.5 m/s on a roadster, 7.5 m/s on a racing bicycle, 10 m/s with a faired HPV and 14 m/s with an ultimate HPV.
The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...