1.(Textbook Problem 15-55) The cart has a mass of 3 kg and rolls freely from Adown the slope. When it reaches the bottom, a spring loaded gun fires a 0.5−kgball out the back with a horizontal velocity ofvb/c= 0.6 m/s, measured relative tothe cart. Determine the final velocity of the cart.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

What does si stand for,when referring to a system of measurement