Power equivalents, conversion factors

There are a variety of problem-solving strategies that you will use as you prepare for and take the AP test. Dimensional analysis, sometimes known as the factor label method, is one of the most important of the techniques for you to master. Dimensional analysis is a problem-solving technique that relies on the use of conversion factors to change measurements from one unit to another. It is a very powerful technique but requires careful attention during setup. The conversion factors that are used are equalities between one unit and an equivalent amount of some other unit. In financial terms, we can say that 100 pennies is equal to 1 dollar. While the units of measure are different (pennies and dollars) and the numbers are different (100 and 1), each represents the same amount of money. Therefore, the two are equal. Let s use an example that is more aligned with science. We also know that 100 centimeters are equal to 1 meter. If we express this as an equation, we would write ... 

Holden, N. E., and Walker, F. W. Chart of the Nuclides, Physical Constants and Conversion Factors and Table of Equivalents, General Electric Company, Atomic Power Equipment Department, 175 Curtner Avenue, San Jose, CA 95125. An inexpensive ( 1.00) compilation of nuclear data in a paperback format. The booklet is revised... 

The present average body burden of strontium-90 in the world s population is about 0.0002 uc. per person. This corresponds, with Dr. Finkel s conversion factor (5 to 10 /tc. per 70-kg man equivalent to 1 /xc. retained per kg for mice) to a retained dose a = 0.00002 to 0.00004 /xc/kg in mice. Hence in order to justify Dr. Finkel s statement evidence would be needed that the mouse threshold is as great as about 0.00004 /xc/kg that is, we must place a in equation (28) equal to 0.00004 gc/kg. From the values of the constant v in Table 2 (we use the values for v = 170 days, which we believe to be better than those for a = 284 days) we find M = 1 X 10 for the minimal test and 3.4 X 10 for the most powerful test with 10 per cent type-II error, and 3.3 X 10 and 13.5 X 10, respectively, with 1 per cent type-II... 

Fuel equivalent for purchased power is assumed to be 9090Btu/kWh compared with the normal conversation factor of 3414Btu/kWh. This assumption implies power generation loss of 5676 (= 9090 — 3414) Btu for each kWh imported. Thus, power generation loss is 17.9MMBtu/h for 3.15 purchased. The rationale for this assumption will be discussed later with the FE calculation given in equation (3.7). 

---