Which statement is true because of newton's second law?
a)when the net force on an object decreases, the objects acceleration increases.
b)when the net force on an object increases, the objects acceleration decreases.
c)when the net force on an object decreases, the acceleration doesn't change.
d)when the net on an object decreases, the object's acceleration decreases.

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)