maath

This page lists questions and answers that were posted by visitors named maath.

Questions

The following questions were asked by visitors named maath.

Find a vector of length 3 that is perpendicular to [2,1,-2]
8 years ago
Show that any dilation transforms any figure into a similar figure.
8 years ago
Is tan(90-theta) the same as tan(theta)???
7 years ago
The volume enclosed by a sphere of radius r is (4/3)πr^3. The surface area of the same sphere is 4πr^2. You may already have noticed that the volume is exactly (1/3)r times the surface area. Explain why this relationship should be expected. One way is to...
7 years ago
Show that the surface area of a sphere is two thirds of the total surface area of any cylinder circumscribed around the sphere (the sphere therefore touches both bases of the cylinder as well as its lateral surface).
7 years ago
How do you find the value of m in the equation y=k+asin(mx)?
7 years ago
Let F1 = (0,2), F2 = (0,-2), and P = (x,y). Use the distance formula to convert the equation PF1 + PF2 = 6 into Cartesian form. Simplify your answer until it reaches the form hx^2+ky^2=m. I tried solving this but I got stuck with all the square roots and...
7 years ago
Explain the notation M^-1 used for the inverse of a square matrix M. I thought M^-1 would be a normal inverse matrix except the numbers would be vertically switched like in fractions...? Not sure though.
7 years ago
How do you write the chemical formula for ammonium acetate and ammonium hydrogen sulfate?
7 years ago
A chemist in a galaxy far, far away performed the Millikan oil drop experiment and got the following results for the charges on various drops. 2.52 ✕ 10-12 zirkombs 9.45 ✕ 10-12 zirkombs 3.78 ✕ 10-12 zirkombs 6.30 ✕ 10-13 zirkombs Use these data to calcul...
7 years ago
Find p(p^-1(x)) when p(x)=x^2-4 I tried solving this and I got x^4-x+20 but that has no solution so I'm a little confused.
7 years ago
What is the largest number of ions in any of your formulas? What is the total positive charge and the total negative charge in each formula with this many ions? Give two examples of these formulas.
7 years ago
What is a quasi-martial law? I looked this up on google but there's no direct answer to it.
7 years ago
Let F=(0,0) be the focus and the line y=-6 be the directrix. Plot several points P that are half as far from the focus as they are from the directrix. The configuration of all such points is an ellipse. Identify the four points where the ellipse crosses t...
6 years ago
Thallium(I) hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.57 g TlOH per liter. I got 1.44 but I'm pretty sure that's wrong?
6 years ago
There are many examples of graphs that have period 60 and whose y-values vary between -8 and 8. First, find a formula for such a function f, given that f(0)=8. Next, find a formula for such a function g, given that g(0)=0. For your f, also find the three...
6 years ago
Find the focus and directrix for the parabola y=ax^2. What special meaning does the expression 1/(4a) have?
6 years ago
The height of an object moving up and down is described by y=72+40cos18t (in degree mode). To at least three decimal places, confirm that the average speed of the object is 2/pi times its greatest speed.
6 years ago
What is the deeper meaning of the poem, "A Lover" by Amy Lowell? This is her poem: "If I could catch the green lantern of the firefly I could see to write you a letter."
6 years ago
Calculate the average kinetic energy of the N2 molecules in a sample of N2 gas at 266 K and at 532 K. I got 32.7 and 65.5 but they're wrong??
6 years ago
A 152g sample of ice at -37 degrees Celsius is heated until it turns into liquid water at 0 degrees Celsius. Find the change in heat content of the system. I'm really confused on how to solve this question knowing the fact that the state of the system is...
6 years ago
The enthalpy of fusion of ice is 6.020 kJ/mol. The heat capacity of liquid water is 75.4 J/mol degrees Celsius. What is the smallest number of ice cubes at 0 degrees Celsius, each containing one mole of water, necessary to cool 500. g of liquid water init...
6 years ago
Give the maximum number of electrons in an atom that can have these quantum numbers. 1. n = 3, ℓ = 2, mℓ = -1, ms = 1/2 2. n = 2, ℓ = 1, mℓ = -1, ms = -1/2
6 years ago
The focal points of a hyperbola are (0,6) and (0,-6), and the point (5,6) is on one of its branches. Find coordinates for the points where the hyperbola intersects its major axis. Also find equations for the asymptotes, and use them to help you draw the c...
6 years ago
why do molecules and ions with the same number of atoms and valence electrons have the same or similar molecular shape?
6 years ago
Why do some compounds and elements exist as a liquid at room temperature, while others are solids and gases? What forces are involved?
6 years ago
What is the probability that this year's graduation will fall on the birthday of exactly one of the 336 Seniors? What is the probability that there is more than one such Senior?
6 years ago
If three dice are tossed, their sum could be 7. What is the probability of this? I'm guessing it's something to do with combinations?? I wrote down all the combinations of it equaling 7: 3, 3, 1 // 4, 2, 1 // 1, 5, 1 So I thought that since there are five...
6 years ago
what is the absolute value of infinity? is it just zero?
6 years ago
Suppose f(1)=1 and f'(x)≤2 for x≥0. Apply the MVT to the interval [1,x] to prove that f(x)≤2x-1 for all x>1. Verify all the conditions of MVT are satisfied.
5 years ago
In the process of alcohol fermentation, 2 NADH molecules are converted to 2 NAH+ as energy from the NADH is used to drive the formation of ethanol. Explain why there is a need to add energy to a process whose purpose is to extract energy from glucose. I t...
5 years ago
If F'(x)=√1+x^3 and F(1)=5, then what is F(3)? (1+x^3) is all under the square root
5 years ago
what happens when you change an OH to an H on a nucleotide?
5 years ago
Find the length of the curve y = x^2 - (1/8)lnx, 1 ≤ x ≤ e
5 years ago
Find the area of the region bounded by the curve y=x^2*e^x and the x-axis, 0≤x≤1
5 years ago
how do you take the antiderivative of √(1+4x^3)
5 years ago
Humans have yet another antigen system on their red blood cells. The MN blood group refers to a different antigen controlled by codominant alleles (MM, MN, and NN). A woman with blood types (O, MN, Rh+) had a baby with a man with the blood types (AB, N, R...
5 years ago
Solve the following differential equation algebraically dy/dx = xy^2 + 4x y(0) = 0 I reached the point dy/(y^2+4) = xdx but I don't know how to solve the left side of the equation.
5 years ago
In the recent century, the Belgium population grows following the logistic equation. Predict its population in 2020 given the following data: Year 1900 1950 2000 Population (mil) 6.69 8.64 10.24
5 years ago
Expand 4/(x^2+4) as a power series centered at 0.
5 years ago
Does the series 1/n converge to zero? I know that it is a harmonic series, but shouldn't it converge because as x gets really large to infinity, 1/n becomes zero??
5 years ago
One more question... If you have f(x) = xsinx and the question is asking for the fourth degree Taylor polynomial about x=0, can you use the sinx Taylor polynomial series equation? I'm confused because there's the x in front so I don't know how to incorpor...
5 years ago
Find the Taylor series centered at x = -1 for the function f(x) = x(e^x)
5 years ago
what are several ways to parametrize the parabola y=x^2?? or just how do you parametrize a parabola in general?
5 years ago
If xy+x+y=1, find dy/dx.
5 years ago
What's an example of a short problem where either the first or second derivative test can be applied but the first derivative test is easier? What's an example of a short problem where the second derivative test is easier?
5 years ago
What is an example of a convergent alternating series where the conditions of the alternating series test do not hold?
5 years ago
When a ball is slowly rolled across a horizontal plane, why is the velocity constant? Is it because the rate of position changing over time is constant or because the acceleration is zero?
5 years ago
What is the reciprocal modulo 28 of 5?
4 years ago

Answers

The following answers were posted by visitors named maath.

okay thanks! also is there any way to simplify (cos^4(theta) - sin^4(theta)) / (cos^2(theta)*sin(theta))
7 years ago
what if you had a maximum point let's say (30,6) and a y-int of (2,0) and you had to find the equation of the graph? I get how to find the other variables just not m.
7 years ago
sorry my response is so late... I tried solving it again and I got the equation y=2+4sin(3x). I got the two because the graph is shifted 2 units up and I got the four from the graph being stretched vertically 4 times. Then I plugged in the point (30,6) in...
7 years ago
okay, that makes sense. thank you!
7 years ago
right thank you!
7 years ago
Ohh okay got it thank you!
7 years ago
Okay, that makes so much more sense. Thank you so much!
6 years ago
Okay got it thank you!
6 years ago
how do I calculate the heat of fusion of ice??
6 years ago
Ohh okay, all these answers make sense. Thank you so much!
6 years ago
MVT --> Median Value Theorem
5 years ago
ohh that makes sense, thank you so much!! sorry I saw this so late
5 years ago
how would you simplify that to a fraction
5 years ago
I got that, but I wasn't sure how to integrate dy/(x^2+4)
5 years ago
sorry I responded too early, thank you so much
5 years ago
ohh that makes sense...but is there a way of solving it without using Taylor series?
5 years ago
Oh, got it. Thank you!!
5 years ago
Just watched it and it makes more sense. Thank you so much!
5 years ago
I don't know how to tell if the first derivative test is easier or the second is easier...how would you figure that out?
5 years ago
Oh okay, but why is the velocity constant? Shouldn't it decrease because the ball rolls slower over time?
5 years ago