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Answers by Stanton D.

Chantelle, You're exactly on the right track; she has to grip it tighter in order to exert a frictional force sufficient to keep the chain from slipping through her fingers. Now, you know that frictional force opposes whatever tendency the chain has to slip: in other words, her fingers are (passively)...

Erin, For exponential functions, a fixed difference in domain translates into a fixed ratio of range. Difference given in domain = 38 (30 - (-8)). Ratio of range = 580/200 = 2.9, ln(ratio of range) = 1.06471074 So for function f(x) = a * exp(kx) take ln each side: ln (f(x))...

This isn't a problem, yet. What was the original form, and what are p and q supposed to represent?   All right, that's a proper problem now. You want an expression for x ("solve for x"). To do this, you must gather all the terms for x together. But in order to easily...

So Jessi, What do you think the midpoint means? It means, that you started at A and went halfway towards B IN THE DIRECTION B LIES IN. So, how do you find the *displacement* from A to the midpoint? It's ALWAYS final minus initial (for each of x and y). So let's say for example that A = (2,-2)...

Tamie, There's a couple of ways you could approach this problem. The first is intuitive: 1) If Alfred drives 10 mph slower than Brigit, then for every hour Alfred drives, he lags Brigit by (another) 10 miles. Since in the problem, Alfred built up a 25 mile lag from Brigit, therefore everyone...

However, the useful point here is probably *why* all side chains per se have the enormous effect on viscosity -- for a molecule this compact, the side chains of adjacent molecules aren't tangling much around each other (as would much longer chains), there's no steric room for them to do so...

Crystal, A prion is a particular denatured configuration of one (or possibly more than one) surface membrane protein of nervous system cells. So it's both a macromolecule (the protein), plus the particular shape it has taken, which unfortunately enable it to latch onto and transform normal protein...

Quadratic expression means a sum of terms (each term has form ax^n , where a is a constant (real number), and n is an integer, such as 0, 1, 2, etc.), and x stands for a variable (x, y, z, p, etc.)(the same variable across the whole expression!). Quadratic means that one term in the expression...

Natalie, These are both problems in Special Relativity, the theory and laws of what happens to certain measureable properties of objects travelling with respect to each other. It seems weird to us in the normal, slowly moving world, but the measurable dimensions of objects change when they're...

Heaven, Zygomycetes are a certain family of fungi. Like many other organisms, within the family there are species with all sorts of numbers of chromosomes! You'd have to go in and look up "ploidy" for a few species specifically, to get an idea of what's typical. I suspect, the purpose...

Courtney, There are just three types of systems of equations: 1) inconsistent = no solutions : such as (for two equations in two variables) two parallel but not overlapping lines 2) dependent = infinite number of solutions : such as (for two equations in two variables) two lines that...

I'd have to differ on the answer here. Richard P., the adiabatic lapse rate arises from a volume of gas expanding against a gradually decreasing surround pressure. Thus, such a gas packet does work on the surroundings as it rises, and experiences a loss of sensible heat as a result. Here, in spite...

April, I'll point you in the right direction on this one, since it's your third question today (that's close to spamming!) In chemistry, you must be agile at converting among several units of measure for substances. The one that's convenient to measure directly in the lab is mass (frequently...

April, You're posting an awful lot of questions today. Big test review? Charles' Law indicates that the volume a gas takes up is proportional to the temperature ****in degrees Kelvin****. Therefore, calculate what your initial and final temperatures are in degrees K (add 273.15 to the...