{"product_id":"whirlda-eulers-disk-physics-t-shirt","title":"Whirlda – Euler's Disk Physics T-Shirt","description":"\u003cp\u003eWhirlda's tilted shield sinks lower and rings faster, until it stops dead.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eSpin a heavy disk on a flat table. As it loses energy and leans lower, its wobble speeds up, then it stops dead in a finite time. For a small tilt, rolling without slipping, the wobble rate rises as the tilt falls.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eΩ ∝ α^(−1\/2);   one model (Moffatt 2000): α ∝ (t₀ − t)^(1\/3), Ω ∝ (t₀ − t)^(−1\/6)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eΩ: angular speed of the contact point round the table, the wobble rate (rad\/s)\u003c\/li\u003e\n\u003cli\u003eα: tilt angle between disk face and table (rad)\u003c\/li\u003e\n\u003cli\u003et: time (s)\u003c\/li\u003e\n\u003cli\u003et₀: finite stop time (s)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMoffatt's 2000 model blamed air drag, but vacuum tests and rolling-friction models disagree on the cause.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e The exponent is still debated. The wobble never reaches infinite speed: real contact physics takes over first.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Whirlda, the pixel-art character, with the title. Back: the wobble law, Moffatt's model, the debate over the cause, and the finite-time stop. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50960827842663,"sku":"16038807224663747683","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50960827875431,"sku":"17703951185159006714","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50960827908199,"sku":"27924147263147167774","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50960827940967,"sku":"16326552264834024258","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50960827973735,"sku":"15348159163553213342","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50960828006503,"sku":"31480523612764421735","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50960828039271,"sku":"33672555613676875682","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50960828072039,"sku":"43643984920945561917","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50960828104807,"sku":"15971393163186841268","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50960828137575,"sku":"19852590963069015757","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50960828170343,"sku":"23191961722031187616","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50960828203111,"sku":"78709670752340667272","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50960828235879,"sku":"29630004566474435225","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50960828268647,"sku":"70637259555702585617","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50960828301415,"sku":"23630304483698799354","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50960828334183,"sku":"98504361698930444918","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/eulers-disk_front_01_white.png?v=1793628624","url":"https:\/\/pixelatedphysics.com\/nl\/products\/whirlda-eulers-disk-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}