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The USBC and World Bowling promulgate bowling ball specifications. USBC specifications include physical requirements for weight (≤16 pounds (7.3 kg)), diameter (8.500 inches (21.59 cm)—8.595 inches (21.83 cm)), surface hardness, surface roughness, hole drilling limitations (example: a single balance hole including the thumb hole for "two-handed" bowlers [3]), balance, plug limitations, and ...
The trailer hitch ball attaches to a ball mount; with a diameter typically 1 ⁄ 16 inch (1.6 mm) larger than the ball bolt/shank diameter. [2] The ball mount must match the SAE hitch class. [3] The ballmount for a receiver-type hitch is a square bar that fits into a receiver attached to the vehicle.
45–49 inches (110–120 cm) on wooden floor from height of 72 inches (180 cm) rubber Sixes: 19.7-20.3 centimeters - - - elastomeric Women lacrosse: 20-20.3 centimeters - 142-149 grams - 1.1-1.3 meters on wooden floor dropped from height of 1.8 meters Intercrosse: Sphere 23-25 centimeters - 80-100 grams - rubber Polo: Polo: FIP: Sphere - 3–3 ...
Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, Sizes 1, 3, and 4, are also produced for younger players or as training tools. [20]
A ball is tested for bounce by dropping it from a height of 254 cm (100 inches) onto concrete; a bounce between 135 and 147 cm (53 and 58 inches) is acceptable if taking place at sea-level and 20 °C (68 °F) with relative humidity of 60%; high-altitude balls have different characteristics when tested at sea level. [12]
There is no specific height requirement, [41] but due to the weight restrictions, most jockeys stand between 4 ft 10 in (1.47 m) and 5 ft 6 in (1.68 m). [2] Examples of successful jockeys are Frankie Dettori 5 ft 4 in (1.63 m), Calvin Borel 5 ft 4 in (1.63 m), Mario Gutierrez 5 ft 3 in (1.60 m), and Victor Espinoza 5 ft 2 in (1.57 m).
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