A football player throws the ball at a 45 degree angle. Which of the following are possible values for the goven variables at the highest point of the projectile’s trajectory? A. Vertical acceleration Ay=-9.8m/s^2 and vertical velocity Vy=15 m/s.

B. The horizontal velocity Vx=15 m/s while vertical velocity Vy=0m/s

C. The Horizontal Velocity Vx=0 m/s

D. Both horizontal and vertical acceleration equal 0 m/s^2

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)