A piston-cylinder arrangement, shown in figure, contains air at 250 kPa and 300oC. The 50-kg piston has a diameter of 0.1 m and, initially pushes against the stops. The atmosphere is at 100
kPa and 20oC.
(a) Represent the forces acting on the piston through a free body diagram for initial condition.
The cylinder now cools as heat is transferred from air to the ambient surroundings, thereby
reducing the air pressure, resulting in the piston to start moving down.
(b) Represent the forces acting on the piston through a
free body diagram for this condition.
(c) Find the pressure when the piston is just about to
move down?

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.

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

What is a costume plot? why is it important to a film or theater production?