From which of the following do spiral galaxies form?
a. high-density proto-galactic clouds
b. rapidly spinning proto-galactic clouds
c. colliding/merging proto-galactic clouds
d. rapidly cooling proto-galactic clouds

What’s #16 asking and how do i solve it?

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point

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)