Part a: the sun produces 3.9 ⋅ 1033 ergs of radiant energy per second. how many ergs of radiant energy does the sun produce in 2.45 ⋅ 105 seconds? express your answer in scientific notation and show your work. (5 points) part b: which is the more reasonable measurement of the distance between the tracks on a dvd: 7.4 ⋅ 10−4 mm or 7.4 ⋅ 104 mm? justify your answer. (5 points)

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)