Which of the following is a quantitative observation? a. A rough surface
b. An apple is red on color
c. Acid tasting sour
d. A leaf is 10cm long

What is special about a dc circuit ?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.