The air force has conducted many studies on the effects of large accelerations on the human body. in one such study, lt. col. john l. stapp rode a rocket sled that started from rest and attained a speed of 280 m/s in 5 s. the sled was then brought to rest in 1.5 s. what acceleration did lt. col. stapp experience in the first 5 s? how far did the sled travel during this time? what acceleration was experienced in the last 1.5 s? how far did the sled travel in that time?

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.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up