Refrigerant 134a enters a well-insulated nozzle at 200 lbf/in.2, 200°f, with a velocity of 120 ft/s and exits at 50 lbf/in.2 with a velocity of 1500 ft/s. for steady-state operation, and neglecting potential energy effects, determine the temperature, in °f, and the quality of the refrigerant at the exit.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

How is zig zagging a form of acceleration?

Which component of the earth’s atmosphere is decreased due to photosynthesis?