axel vient d'acheter un barbecue fonctionnant au gaz de butane tout neuf ainsi qu'une bouteille de gaz de 6kg. Son barbecue consomme 500g de butane par heure. On rappelle que la combustion du butane nécessite du dioxygène et que l'air atmosphérique contient 20% de dioxygene seulement . Son barbecue consomme 2m3 de dioxygene par heure. il réalise la cuisson de sa viande dans son garage, ferme hermétiquement et d'un volume de 40m3. quelle sera la durée d'utilisation maximale de son barbecue

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body