0.5-lbm of a saturated vapor is converted to asaturated liquid by being cooled in aweighted piston-cylinderdevice maintained at 50 psia. During the phase conversion, thesystem volume decreases by 1.5 ft3; 250 Btu of heat areremoved; and the temperatureremains fixed at 15F. Estimatethe boiling point temperature of this substance when itspressure is 60 psia.

hail is a solid form of precipitation composed of large, layered ice particles called pellets that often have spherical shapes. this phenomenon occurs during thunderstorms in the could type known as cumulus

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air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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