# Questions Asked onApril 15, 2010

1. ## chemistry

what is the boiling point that contains 3.15 moles of ethylene C2H6O2 and 250.0g of H2O? answer should end in degree's celcius a) 1.03 C b) 93.55 C c) 106.45 C d) 6.45 C e) 103.44 C

2. ## math

evaluate: cos (arc sin (4/5) - arc tan 2) with out using a calc.

3. ## Phsyics

The center of a 1.10km diameter spherical pocket of oil is 1.10km beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is . Express

4. ## ochem

What's an equation of the hydrolysis of one ester group in tannins by CaCO3?

5. ## Physics

It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. How far would you

6. ## Physics

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 and a radius of 8.50 . What is the speed of a satellite orbiting 4.70km above the surface? What is the escape speed from the asteroid?

115. ## Math

Find an equation for the ellipse. center:(3,2) a=3c Foci:(1,2)(5,2) h=3 k=2 I do not know where to start.

116. ## math

how do you solve (and show your work for): 5-2x=7

117. ## chemistry

What is sulute

118. ## algebra

in graphing quadratic functions what are the ordered pairs for y=x*x+2

272. ## Math

Write the slope-intercept form of an equation of the line that passes through the given point and is perpendicular to the graph of each equation. 1.(-2,-2),y=-1/3x+9 2.(-4,-3),4x+y=7 3.(-4,1),4x+7y=6 4.(-6,-5),4x+3y=-6 These are the answer I came up with,

273. ## math

How many 5 card poker hands consisting of 3 aces and 2 kings are possible with an ordinary 52-card deck? Answer choice: a).12 b).288 c).6 d).24 I got 24 is that correct?

274. ## Pre-calc-urgent

How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4

275. ## CHEM

given the general chemical equation, A yields 3C + D , a. how many moles of C can be produced from one mole of A? b. how many moles of D can be produced from four moles of A?

276. ## math

Two matrices can be multiplied only if their sizes are compatible. Suppose that U is an m × n matrix, and that V is a p × q matrix. In order for U•V to make sense, what must be true of the dimensions of these matrices? Although matrix multiplication

277. ## statystics

A company manufactures wind turbines. A random sample of 25 turbines is taken and the sample mean life is 20.00 years with a standard deviation of 2.50 years. If you were constructing a 90% two-sided confidence interval estimate, the upper limit would be

278. ## college math

can you help me factor 3xy@+9xy+6x=

279. ## college math

canyou help me factor x^3-x=

280. ## science

suppose 35 grams of waterare cooled from 15 c to 10 c how much heat is given off?

281. ## statystics

: Human Resources took a survey and found that the average commute time one way is 25.4 minutes. However one of the executives feels that the commute is less. He randomly selects 25 commuters and finds that the average is 22.1 minutes with a standard

282. ## chem lab (webwork)

What is the pH of the solution created by combining 1.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 1.80 Complete the table below: What are the pH values if you take

283. ## math help

Let u = [2,−3, 1] and v = [0, 1, 4]. Calculate the vector u − v. Place u and v tail-totail to form two sides of a triangle. With regard to this triangle, what does u−v represent? Calculate the number u•u and discuss its relevance to the diagram you

284. ## physics

How far would you have to drill into the Earth, to reach a point where your weight is reduced by 8.0 ? Approximate the Earth as a uniform sphere.

285. ## physics

Can a person, in principle, travel from Earth to the galactic center (which is about 2.3e4 lightyears distant) in a normal lifetime? Explain, using either time-dilation or length contraction arguments. If they want to make the trip in 24 y what distance

286. ## math

Centered 6 meters above the ground, a Ferris wheel of radius 5 meters rotates at 1 degree per second. Assuming that Jamie’s ride begins at the lowest point on the wheel, find how far Jamie is above the ground after 29 seconds; after 331 seconds; after t

287. ## geometry

There are two noncongruent triangles that have a 9-inch side, a 10-inch side, and that enclose 36 square inches of area. Find the length of the third side in each of these triangles.

288. ## Economics - stock purchase

Can someone please help me? I am so confused! My homework is called stock purchase and I need to find some information abut three stocks. I'm starting with microsoft. The first three questions are the stock name, symbol, and address of the headquarters.

289. ## social studies

in what ways does religon affect american society?

what is a word for what happens when you are confused?