Monday

July 28, 2014

July 28, 2014

Total # Posts: 530

**Physics**

An artillery shell is fired with an initial velocity of 300 m/s at 65.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 37.5 s after firing. What are the x and y components of the shell where it explodes, relative to its firing point? x = _____...

**math 7th**

64 over 96

**Statistics**

Calculate each binomial probability: a. X = 2, n = 8, ð = .10 b. X = 1, n = 10, ð = .40 c. X = 3, n = 12, ð = .70 d. X = 5, n = 9, ð = .90

**Statistics**

A lottery ticket has a grand prize of $28 million. The probability of winning the grand prize is .000000023. Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Show your calculations and reasoning clearly.

**physics**

i dont know

**chemistry**

What volume of 4.50M HCl can be made by mixing 5.65M HCl with 250 mL of 3.55M HCl?

**math**

9m+n=24 m-8n=27 n= 24-9m 27= m - 8(24-9m) 27= m - 192 - 72m 219= -71m so m = 3.0845 Double check by entering this into the other equation. 9(-3.0845)+ (24-9(-3.0845) -27.7605 + 24 - -27.7605 = 24. so m = -3.0845 -3.0845 - 8(n)= 27 -8n= 30.0845 n= - 3.7606 m: -3.0845 n= -3.7606

**algerba**

-10xy - 15y / 5y I believe the expression simplifies to -2x - 3. The Y's cancel out when you divide by 5y.

**Chemistry**

If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions? I found the molar mass of CaCl2 is 111.0g/mol; the molar mass of NaCl is 58.44g/mol. I divided 10g CaCl2/111.0g CaCl2 I divided 10g NaCl/588.44g NaCl and added...

**Chemistry**

So, 2C4H8O + 11O2 ---> 8CO2 + 8H2O Is that right?

**Chemistry**

It says to write the balanced equation for the complete combustion of cyclobutanol in Oxygen. I'm not even sure what the product is supposed to look like so how can I balance the equation? Please help. C4H8O + O2 ---> C4H8O

**chemistry**

You have to draw Lewis Dot structures and than use 1 of two approaches. The first is The vector addition approach, which is most helpful for smaller molecules. The 2nd approach is the center of charge approach, and you look to see where your negatives and positives are on your...

**Chemistry**

For which of the following reactions is the value of Delta H rxn equal to Delta H of formation? I. 2Ca(s) + O2(g) --> 2CaO(s) II. C2H2(g) + H2(g) --> C2H4(g) III. S(s) + O3(g) --> SO3(g) IV. 3Mg(s) + N2(g) --> Mg3N2(s). According to my answer key, the only one is I...

**Chemistry**

What is the de Broglie wavelength, in meters, associated with a proton. (mass = 1.673 x 10^-24g) accelerated to a velocity of 4.5 x 10^7 m/s? I tried dividing the mass by the velocity. I also multiplied the mass times the velocity, and neither answer came out correctly. The fi...

**Chemistry**

Thank you very much.

**Chemistry**

One of the lines in the spectrum of a mercury vapor lamp has a wave length of 254nm. What is the energy, in kj/mol, of this electro magnetic radiation. The work I have done: (6.626 x 10^-34 x 3.0 x 10^8) all divided by (254 x 10^-9.) The answer I calculated is 7.82 x 10^-19. T...

**Chemistry**

If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions? (the molar mass of CaCl2 is 111.0g/mol; the molar mass of NaCl is 58.44g/mol. I found individual molar mass of: Ca-40.08 Cl-35.45 Na-22.99 So I divided 10g CaC...

**Chemistry**

Thankyou both very much.

**Chemistry**

The density of Hg is 13.6g/cm^3. How many Hg atoms are present in 10.0cm^3 of Hg? I think the size of an atom is 6.22 x 10^23. The answer is 4.08 x 10^23. I need help getting to the answer.

**Finance**

Triple your investment in 12 months? Per quarter means you are receiving a 75 percent return on investment every quarter. 3/4 cause quarters implies 4 in the denominator.

**Chemistry**

Thankyou very much

**Chemistry**

I cannot figure this out. It seems so simple, and I should know it. The density of tungsten is 19.3g/cm^3 Express this value in lb/ft^3. I did 19.3g/cm^3 x 2.54cm/inch x 12 inches/1 foot = 588.264. Now 19.3g x 1 ounce/28g x 16 ounces/lb. = 11.03. After reading my answer key, t...

**Algebra 1**

I think you should just know ratios for this. If its 30-60-90 and b= 15, than A= 15/2=7.5 You get this because A is half the size of B. C is three times the size of C, so 7.5 x 3 = 22.5 So 7.5,15,22.5 Hope this helps.

**algebra**

Well if 0 units are produced, your profit is a loss of 262,500 which is primarily your fixed cost. Total revenue function is 98x. X is the number of units sold. I think marginal revenue is just revenues minus variable cost so 98x-23y would be marginal revenue. I might be wrong...

**MATH**

4-(-3)2 ÷ (-7x4+3) 4-(-6) / (-25) 10/-25 = -2/5 The reciprocal is -5/2 or -2.5. Hope this helps.

**Chemistry**

Thankyou very much for clearing that up.

**Chemistry**

Last one I promise! Thankyou for bearing with me. This seems simple enough, but chemistry genuinely makes me feel retarded so I appreciate reassurance. How many molecules of CH4 are there in 48.2g of the compound? I'm assuming that I should just divide 48.2 g by the molar ...

**Chemistry**

What is the % by mass of chlorine in CH2Cl2? I calculated the molar mass of CH2Cl2 which is 84.93. I than calculated the molar mass of Cl2 which was 70.9. Than I divided 70.9 by 84.03 and my percent by mass of chlorine is 83.5 percent. Is this correct?

**Chemistry!**

I'm not sure why, I think I just had a brain spasm. Some reason I always think of converting mols to liters and I had it in my head that it was a 1:1 relationship but I think its 22.4L only when it applies to a gas?

**Chemistry!**

Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4? Balanced equation: C2H4 + 3O2 --> 2CO2 + 2H20 So 1 mole of C2H4/3 mol O2 --> 1.5 mols/ 4.5 mols O2. So if its 1 mol equals 1 liter, than it should be 4.5 mols of O2 x...

**CHEMISTRY**

Oh my gosh yes! Thankyou Dr. Bob, you are truelly my saint.

**CHEMISTRY**

How many grams of CH4 are required to produce 43 g of Cu according to the following equation: 4CuO + CH4 --> CO2 + 2H20 + 4Cu? I already tried to work the problem myself, and I may have gotten this right, but I do not have an answer key to compare to. #gCH4 = (43gCu) x (1 m...

**Math 115**

Actually Jerome, I think all you have to do is convert 7/8 into a percent and add it to 4. So 7/8 = .875 + 4 = 4.875 or 487.5 percent.

**CHEMISTRY**

When 0.668 L of Ar at 1.20 atm and 227°C is mixed with 0.258 L of O2 at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask? Pressure is given for both, am I supposed to use v1p1/t1 = v2p2/t2? Some reason this really doesn't make sen...

**Chemistry**

Thankyou, that helped so much.

**Chemistry**

I am having a horrible time with Enthalpy change. I understand how to find specific heat I believe, but the heat capacity of the vessel is given as 10 J/K. My problem is that my professor did not show us how to work this type of problem, and I desperately need help with it. He...

**Chemistry**

My mind is bleeding again. I am trying to figure out the molarity of acetic acid in Vinegar. We used a standard solution of .613 Molars of NaOH. We added 33.75mL of NaOH to completely titrate/neutralize 25mL of Vinegar and we're supposed to be able to figure out the molari...

**Chemistry**

Thankyou soooo much! I really appreciate your help

**Chemistry**

What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 140.0 mL of 0.400 M Pb(NO3)2? I desperately need help with this, I cannot figure it out, my mind is bleeding.

**physics**

Monochromatic light with a wavelength of 5.0 E -7 meter passes through two narrow slits, producing an interference pattern on a screen 3.0 meters away. The first order bright band lines 2.0 E -2 meters away from the central bright maxima. What is the distance between the slits?

**physics**

A ball at the top of its drop has 15 J of potential energy, neglecting air resistance, what is the kinetic energy at the bottom of the drop? What is the velocity?

**physics**

what is equilibrium temperature?

**Marketing**

I'm afraid nothing returned that was useful to me, but thanks for the suggestion.

**Marketing**

Where can I find case studies of businesses that advertised and businesses that didn't?

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as i...

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as i...

**English**

I have a question. I wrote a research paper and used MLA. I referenced from a book three different times in my paper. When I do my work cited page in the end, how do I go about the page numbers?

**English**

I have a question. I wrote a research paper and used MLA. I referenced from a book three different times in my paper. When I do my work cited page in the end, how do I go about the page numbers?

**math**

4(4x - 3y) + 2(5x - 2y)

**Math**

How do you study for math???

**Social studies**

How?????????

**Social studies**

How do I get a D if F to a B or A

**Math**

Why don't you use the conversions I told you: 1 liters = 1000 milliliters so 4,200 milliliters = 4.2 liters (0.2 liters = 200 mL)

**french**

More or less

**math**

When a line intersects another forming a 90 degree/ right angle.

**Math**

1 liters = 1000 milliliters so 4,200 milliliters = 4.2 liters

**physics**

Work = Force x Distance 115 x 15 = 1,725 20 x 10 = 200 Obviously pushing 115 N over 15 m

**Math**

Take an odd digit and use it exactly three times, so that the three digits are equal in value to an even number. ADDITION, SUBTRACTION, MULTIPLICATION AND DIVISION CANNOT BE USED! Can you please help me!

**6th grade math**

What I'd advise is to balance the equation. What you do on one side of the equal sign, do it on the other. 9/2m-8= -5.5 + 4m 9/2m = 4 1/2m 4 1/2m -8= -5.5 + 4m Add 8 on both sides 4 1/2m = 2.5 + 4m Subtract 4m on both sides 1/2m = 2.5 Multiply 2 on both sides m=5

**American history**

At the Philadelphia (Constitutional) Convention, what do you see as the general goal of the majority of the delegates? Did the nationallist (central govenrment) theme proposed by James Madison make more sense than the old Confederation govenrment?

**math**

find the diameter of a circle if the circumference is 8cm round to the nearest tenth

**Organic Chemistry**

Explain why methanol and acetone are not suitable solvents for extracting organic compounds from aqueous solutions.

**algebra**

What are the three ways to put numbers in expanded form?

**HSM210**

d. testimonial—quoting or paraphrasing an authority or celebrity to support one’s own viewpoint for #10

**accounting**

How to find debt ratio

**college comprehensive grammar checkpoint**

thanks so much. I really appreciate it.

**college comprehensive grammar checkpoint**

Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved? 1b. Did you know a famous animal-rights activist have criticized horseracing because of the dangers involved? Subject-verb agreement 2a. Peer editing academic papers requir...

**Math**

The values of outstanding bonds change whenever the going rate of interest changes. In general, short-term interest rates are more volatile than long-term interest rates. Therefore, short-term bond prices are more sensitive to interest rate changes than are long-term bond pric...

**9th grade- Algebra 1**

It means quickly or swiftly

**Chemistry**

Which pair of molecules has the strongest dipole-dipole interactions? a- CO2 and CO2 b- CO2 and CH4 c- NH3 and NH3 d- NH3 and CH4 e- CH4 and CH4 Would it be C?

**Chemistry**

Which pair of molecules has the strongest dipole-dipole interactions? a- CO2 and CO2 b- CO2 and CH4 c- NH3 and NH3 d- NH3 and CH4 e- CH4 and CH4 how do you figure out the answer to this question?

**calc**

Let g(s)=1/(s-2)on the interval (0,1). Find the absolute maximum and absolute minimum of g(s) on this interval

**calc**

let f(x)= -x^2 +3x on the interval [1,3] . Find the absolute maximum and absolute minimum of f(x) on this interval

**anatomy**

when estrogen level drops; the body's ability to regenerate the bones is reduced because the bone cell breakers are uncontrolled.

**Number patterns**

What is the number pattern between the following numbers. and why arranged this way 8 5 4 1 7 6 3 2 0

**Math**

3x-7=5x+13, what is x?

**Physics**

.75

**Physics**

a slide loving pig slides down a certain 45° slide in twice the time it would take to slide down a frictionless 45° slide. What is the coefficient of kinetic friction between the pig and the slide?

**To Mrs.Sue**

Thanks that helped alot i figured the answer and it was caverns.

**6th grade Science**

Over time acids in ground water can result in the formation of karst topography, such as ___________ which i figured was sinkholes, _________________ which i figured was caves, and the last one i really don't know? _________________ Thanks- Casey

**6th grade**

a hypothesis is a possible explanation based on research and observation.

**science**

What does factors mean?

**science**

which is soil better for wind erosion? gravel or humus

**Science**

Draw the Lewis structure for N2H2, a neutral molecule.

**algebra 1**

Blue prints allow an area of 20,000 square feet for the playground. the width of the rectangular playground is 80 feet less than its length and its perimeter is 640 freet. what is the length of the playground?

**bio/science**

that is what I was thinking as well.

**bio/science**

Which of the following would be the best advice for the farmerof this land: h t t p ://tinypic. c o m /r/smydsg/3 (take out spaces) a. replace your current crop with a potato crop b. replace your current crop with a corn crop c. replace your current crop with an asparagus crop...

**science**

I dont understand how you can tell that E is eating A. I thought A would be eating E?

**science**

h t t p: / / tinypic . co m/r/f2vw1w/3 In the link above (take out the spaces) there is supposed to be a picture representing a foodweb. 1. Which letter is the producer? Is it A? 2. I'm not sure what B and C would represent? A. producer B. primary consumer C. Secondary con...

**science**

is it zooplankton and sea anemone? if not, my second guess is zebra and wild horse

**biology**

most of the total mass of a plant comesfrom which source? Nitrogen Oxygen Carbon Dioxide Water Hydrogen Is is carbon dioxide?

**Trig problem**

What is a coterminal angle with 170 degrees?

**Maths**

Sorry, I'm still a bit confused. Do I just divide 4400 by 360?

**chemistry**

how do i d

**3rd grade**

What feature of light energy makes it different from other kinds of energy?

**8th grade**

In "Beef Flat"... in comparison to "B Flat" Ha Ha Ha.

**Math**

Evaluate the series. 9 ‡” log(k+1/k) k=4

**science**

i need help writing up the discussion for a science experiment. I need to know what to include and say in it.

**chemistry acids and bases**

which solution is potentially more hazardous to your eyes: .1M HCl or .1M NaOH? Why? are they equally hazardous since one is an extremely strong acid and one is an extremely strong base?

**algebra**

I have to come up with examples of how to factor a trinomial; factoring with !=a and I have no idea what that even means. Can anyone explain or give me an example? It'd really be appreciated :)

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