Show that the coefficients of performance of refrigerators and heat pumps are related by COPref = COPhp 1 . Start with the definitions of the COP s and the conservation of energy relationship between Qh , Qc , and W .
Dudaie 1 Physics II: Chapter 19 Electric charges, Forces, and Fields “Like attracts like” 1. Electric charge a. There are 2 types of charges on any given objects i. Negative () = electron 1. All electrons have some defining intrinsi19roperties a. electric charge e= 1.60 x 10 C b. mass M =e9.11 x 10 kg31 ii. Positive (+) = proton 19 1. electric charge e= 1.602710 C 2. mass M =p1.673 x 10 kg iii. Object with equal amounts of both charges have a zero net charge Neutral b. Conservation of electric charge i. The total electric charge of the universe is constant, no physical process can increase of decrease in the total amount of the electric charge in the universe; electric charge can only be transferred c. Polarization i. The ability of charged objects to attract small neutral objects 1. When a positively charged object is held near a neutral object the opposite charges are attract