In , use elementary row operations to

Introductory Chemistry 5
Write a balanced chemical equation for the reaction of gaseous nitrogen dioxide with hydrogen gas to form gaseous ammonia and liquid water.

Probability and Statistical Inference 9
(Michigan Mathematics Prize Competition, 1992, Part II) From the set \(\{1,2,3, \ldots, n\}\), \(k\) distinct integers are selected at random and arranged in numerical order (from lowest to highest). Let \(P(i, r, k, n)\) denote the probability that integer \(i\) is in position \(r\). For example, ob

Organic Chemistry 2
A ketone with molecular formula C9H18O exhibits only one signal in its 1 H NMR spectrum. Provide a systematic (IUPAC) name for this compound.

Classical Mechanics 0
By evaluating their dot product, find the values of the scalar s for which the two vectors b = x + s'Sr and c = x sS7 are orthogonal. (Remember that two vectors are orthogonal if and only if their dot product is zero.) Explain your answers with a sketch.

College Physics 12
Problem 69GP Figure P17.67 shows the light intensity on a screen 2.5 m behind an aperture. The aperture is illuminated with light of wavelength 600 nm. a. Is the aperture a single slit or a double slit? Explain. b. If the aperture is a single slit, what is its width? If it is a double slit, what is

Biology 8
Which process is most directly driven by light energy? a. creation of a pH gradient by pumping protons across the thylakoid membrane b. carbon fixation in the stroma Co reduction of NADP- molecules d. removal of electrons from chlorophyll molecules e. ATP synthesis

The Practice of Statistics 5
Been to the movies? An opinion poll calls 2000 ran domly chosen residential telephone numbers, then asks to speak with an adult member of the household. The interviewer asks, How many movies have you watched in a movie theater in the past 12 months? In all, 1131 people responded. The researchers used

Urban Economics 8
Education Spillover Benefi ts Consider a city where the initial wage of high-school dropouts is $10. Suppose the college share of the workforce increases by 2 percent. Use a demand-supply graph of the labor market for high-school dropouts to show the effects on the dropout wage. Use the numbers provi