Friday

April 18, 2014

April 18, 2014

Total # Posts: 1,668

**Chemistry**

419 kj into jules = 419000 Divide by avogadro's number 419000/6.022e23 Divide that by Planck's Constant for the answer.

**Physic**

It is possible to shoot an arrow at a speed as high as 121 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up?

**math**

thanks!

**math**

i need to put it in order i think it is 3.56 and then 3.546

**math**

i need to put it in order i think it is 3.56 and then 3.546

**math**

which number is greater 3.546 or 3.56

**physics**

a ball with a mass of 0.150 g and positive charge of q=41.2 C is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of =22.0o from the vertical. What is the magnitude of the electric field?

**chemistry**

what is the pH of the buffer when 4ml of 1M HCl is added to a 100ml buffer solution made using 5ml 1M Na2HPO4 and 5ml 1M NaH2PO4? The pKa for H+ + HPO4- ==> H2PO4 is 6.82. What would happen to the pH if the 100ml buffer had been made up at the starting pH (6.82) using Tris ...

**chemistry**

What happens when 4ml of 1M HCL is added to 100ml buffer made using 5ml 1M Na2HPO4 and 5ml 1M NaH2PO4? The pKa for H+ + HPO4- = H2PO4 is 6.82.

**economics**

This statement is incorrect, when price decreases and demand is relatively elastic, revenue (and expenditure) will rise.

**math**

how can fisherman save gas

**English-Literature**

b grave

**Physics**

A 1.50 kg snowball is fired from a cliff 13.0 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal. (a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below the cliff. m/s (b...

**Chemistry**

3.40848g. I put this in and it was right.

**math**

The volume of a cone is three hundred cubic kilometers. If the radius of the base is 9 kilometers, what is the height of the cone? Use three point one four for pi. Show your work and round to the nearest tenth.

**Chemistry**

A sample of sodium-24 with an activity of 12 mCi is used to study the rate of blow flow in the circulatory system. If sodium -24 has a half-life of 15 hours, what is the activity of the sodium after 2.5 d ?

**Physics**

A 1.00 kg particle has the xy coordinates (-1.20 m, 0.500 m) and a 3.00 kg particle has the xy coordinates (0.600 m, -0.750 m). Both lie on a horizontal plane. At what (a) x and (b) y coordinates must you place a 1.00 kg particle such that the center of mass of the three-parti...

**Math**

How do you find the perimeter and area of a right triangle?

**Chemistryy**

14g I put it in and it's right.

**Science**

If Frankie the kangaroo climbed out of the crate and pushed the crate with a mighty 12 newtons of force against the efforts of Fred and the man (each applying 10 newtons of force), what would be the net force on the crate from all the pushing? 0 newtons *8 newtons 10 newtons 2...

**Science**

Please Check 1.) If a quantity increases as a second quantity increases and decreases as the second quantity decreases the two quantities are said to be *a)Directly proportional b)Inversely proportional c)Completely unrelated d)Blue and red 2.) If a quantity increases as a sec...

**Chemistry**

How much ammonia is produced if 1.80 m3 of hydrogen reacts with 0.5m3 of nitrogen? Also state which reagent is in excess and by how much? Question is related to the Haber process. Please can anyone answer this for me by 02 July 2010. With all equations. Thanx

**chemistry**

Thank you. :)

**History **

1.)Under the Articles of Confederation, _____. a)coordination among the States was difficult *b)Congress held both legislative and executive authority c)the national government could not force the States to obey its laws d)All of these answers are correct. 2.)Rhode Island ____...

**ECONOMICS**

The question is is it T or F (true or false).

**Government**

1. a.)Absolutism,constitutional monarchy 5. c.)a direct democracy

**Government**

*= my answer 1. _____ is closely related to _____. a.)Absolutism,constitutional monarchy b.)Revolution, figurehead c.)Socialism, communism *d.)Authoritarianism, democracy 2. Popular sovereignty is _____. a.)the idea that the people are the ultimate source of authority b.)a fun...

**English/Reading**

so I will change #6 to unsound opinion because it doesn't sound reliable.

**English/Reading**

Read the following statements and then determine whether they are facts, unsound opinions, sound opinions, or authoritative opinions. Select the correct answer for each statement. Are any of these correct/incorrect? If so please help. 1.)Due to Einstein's findings in the s...

**math**

1.) Write the equation for the line in slope-intercept form:Slope: m=3; Y-intercept: B=7 *y - 3 = 7(x - 3) *y = 3x + 7 *y = 7x - 3 2.)Write the equation for the line in slope-intercept form: Slope: m=4/3; Y-intercept: b=-2 *y = 4/3x - 2 *y + x = 2x + 1/2 *y = 1/2x - 2 3.)Which...

**Geo (locus)**

I don't fully get this stuff but some of these I guessed on and some I think I;m close so will someone check/ help me please? * is the answer I put 1. Point A is 0.5 cm from j. k and k are parallel and 1 cm apart. Find the locus of points that are 0.75 cm from A and equidi...

**College Physics**

A rock thrown horizontally at a large bell 54.0 m away is heard to hit the bell 4.80 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)

**Science**

what is the molarity of a solution made by dissolving 7.5 g of magnesium nitrate in enough water to make 25.o mL of solution

**algebra**

write as an algebraic expression. 4 times the difference of a number and 3?

**science**

how many joules are required to evaporate 1 gram of boiling water?

**trig**

If (-2,5) is a point on the terminal side of an angle theta, find the exact value of the six trigonometric functions of theta. Then find the actual measure of theta.

**Algebra**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?

**aLGEBRA**

Find the domain of the function g(x)= 1/6-5x I know that x is a real number but I need the domain please.

**aLGEBRA**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?

**math**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?

**Math**

Find the domain of the function g(x)= 1/6-5x I know that x is a real number but I need the domain please.

**Math**

On top of the sears building is a tv tower. From a point 300 ft away the bottom of the tower is at an angle of elevation equal to 42.14 degrees and the top of the tower is at an angle of elevation equal to 45.81 degrees. How tall is the tower.

**Math**

On top of the sears building is a tv tower. From a point 300 ft away the bottom of the tower is at an angle of elevation equal to 42.14 degrees and the top of the tower is at an angle of elevation equal to 45.81 degrees. How tall is the tower.

**algebra**

X^2-2X-1 is the complete answer see site above for example

**algebra**

4x^3-5x^2-10x-3 divided by 4x+3

**algebra**

one clerk can stuff every 30 seconds the 2nd clerk i every 40 seconds. how long will it take them to stuff 140 envelopes

**Chemistry**

74.38L

**math**

Write the following series using sigma notation: (x/3)-((4x^2)/9)+(x^3/3)-((16x^4)/81)+((25x^5)/243)-...

**english**

can fear be the mood of an essay iff not can you give me examples of the mood of an essay

**word study**

ship is to trip as shout is to

**chemistry**

How do you make a 100mL solution of 1.50 M of NaCl.

**college**

2039 km = 2039000 NOTE: Projectile motion signifies an x and y displacement, but let us assume this pertains to the freefall laws of motion. Top of the trajectory: Vf = 0 Vf^2 = Vo^2 + 2gy 0 = Vo^2 + 2(-9.81 m/s^2)(2039000 m) V0^2 = 4.00052*10^7 m^2/s^2 Vo = 6324.97 m/s

**Chemistry**

In studying the chemistry and qualitative analysis of anions, why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid solution?

**Chemistry**

3. M = Molarity = mols per liter 0.85 M NaCl is equal to 0.85 mols/L You have 100 ml. (0.85 mol/L)(0.1 L) = 0.085 mol of NaCl In other words, add 0.085 mols of NaCl to the 100 ml solution. OR add (0.085 mol NaCl) * (58.44 g NaCl/molNaCl) = 4.9674 grams NaCL Add 4.97 g NaCl to ...

**chemistry**

how to make a 100 mL solutino of 1.50M of NaCl

**algebra**

Get y-intercept when x=0 g(x) = y = 2(0)^2 + 3(0) - 1 (0,-1) ; y-intercept = -1 x-intercept: set function equal to 0 2x^2 + 3x - 1 = 0 After quadratic equation... x-intercepts: x = -1.78, and x = 0.28 function to the 2nd power of x, so is a parabola opening upwards. Graphing t...

**Accounting**

If the owner of a company invests personal funds into his company, where does that fit into the balance sheet. I know the cash will increase, but I don't know how it put it in the equity section. For example, If Greg Jones invests $2000 into his company, would to equity se...

**Accounting**

If the owner of a company invests personal funds into his company, where does that fit into the balance sheet. I know the cash will increase, but I don't know how it put it in the equity section. For example, If Greg Jones invests $2000 into his company, would to equity se...

**Accounting**

If the owner of a company invests personal funds into his company, where does that fit into the balance sheet. I know the cash will increase, but I don't know how it put it in the equity section. For example, If Greg Jones invests $2000 into his company, would to equity se...

**Physics**

In using a slide wire potentiometer, show a proof for the equation Vx = Cx where V = the voltage drop, and C = the position along the slide wire potentiometer.

**Chemistry**

I have the Ksp. BaSO4 is 1.1 x 10^-10 and BaF2 is 1.8 x 10^-7 but what do you mean calculate (Ba^2+) needed to ppt BaSO4 and BaF2? how do you do that? that's the part i dont understand.

**Chemistry**

if an aqueous solution of BA(NO3)2 is added to 1.0 L of a solution containing 0.05 mol F- and 0.075 mol SO4 2-, which salt will precipitate first?

**math**

a^2 + b^2 = c^2 90^2 +b^2 = 150^2 b^2 = 150^2 - 90^2 b = (150^2 - 90^2)^1/2 a number raised to the 1/2 is the same as the sq. route of that number. Just easier to write with the keyboard. b = 120

**Accounting**

In the general journalizations, those funds are entered as cash for the debit, and capitol for the credit

**Accounting**

When the owner of a company invests his personal funds into the business, would it be entered as a credit to his drawings in the Ledger or would it be entered in a new column under the company's revenue?

**Physics**

For voltage variation with length, in using a slide meter, the wire resistance varies linearly with length as Rx = resistivity/Area. Since the voltage and resistance are related with ohm's law, Vx= iRx, the current is the same alog all pts. along the slide wire. The curren...

**math**

$33.80 * 2.5% 33.8 * 0.025 = 0.845 = 0.85 $33.80 - $0.85 = $32.95 Depending on where you round.

**Physics**

What is the proof for voltage versus length in the equation V=Cx?

**Math**

Find the common denominator: 2 5/6 = [(2*6)+5]/6 = 17/6 8/3 = 16/6 17/6 - 16/6 = 1/6 Therefore, 1/6 must be added to 8/3 to make 2 5/6.

**Statistics**

12% of voters in a recent election voted on the greens candidate, if 10 people were randomly selected what is the probability that exactly 4 people voted for the green candidate.

**trig**

how do you use doubel-angle formulas to find sin, cos, and tan

**chemistry**

Well, this is a really late post lol. But to find the qcalorimeter, you must use the equation... qcalorimeter = Csp + (delta)T (delta)T is the same as what you used for qwater Csp -> you calculated this earlier in lab. "average heat capacity of the calorimeter" Ho...

**accounting**

John wants to dissolve his business.His balance sheet shows assets with a value of $250,000 in total. Liabilities are shown at 200,000 leaving equity of $50,000 for John.He only expects to get $180,00,000 for his assets when he sells them because some fixed assets are old and ...

**computer science**

Write a program that will input an item’s wholesale cost and its markup percentage. The program will output the item’s retail price. The program should repeat for several input values. For example, if an item cost is 5.00 and markup is 100%, then the retail price is ...

**language arts**

What is a high shrill sound ending with wh

**Physics**

1. A pair of narrow, parallel slits separated by a distance of 0.408 mm are illuminated by green laser light with wavelength of λ = 537.5 nm. The interference pattern is observed on a screen 1.56 m from the plane of the parallel slits. Calculate the distance from the cent...

**Trig**

I'm really having a hard time determining an equation for a pendulum problem. It has to be in the form H(t)=asin[b(t-c)]=d. I've already determined a=25, d=30 and b=pi/14 but I can't figure out how to get c (the phase shift). How do I figure out the phase shift in ...

**Math **

Could someone please help with this question. State the properties of y = 2sec(-2x + 180°) + 3. My answer: First I graphed y = 2sec(-2x + 180°) + 3 in the following way. 1)graph y=sec(x) 2) apply a horizontal compression by a factor of 1/2. 3) apply a vertical expansio...

**Math**

Thank you very much!

**Math**

Thank you very much!

**Math**

Can someone please explain (cos(x)+sin(x))/(cos(x)-sin(x)=sec(2x)+tan(2x). I have no luck with this. Thanks

**Physics**

A small, nonconducting ball of mass m=1.0mg and charge q=2.0*10^-8 C (distributed uniformly through it's volume) hangs from an insulated thread that makes an angle theta = 30 degrees with the vertical, uniformly charged nonconducting sheet. considering the gravitational fo...

**Physics**

Damon, I think you made an arithmetic error here: 3.75 m g = 44.5 d^2 - .85 m g 44.5 d^2 = 2.90 m g It should be 44.5d^2 = 4.6 m g Then solve from there, I made that change and got the right answer.

**Auditing**

lool no one will answer all the questions for you over here..google termpapergurus..they will do your hw for you :) its really neat

**Math**

A box has a bottom with one edge 7 times as long as the other. If the box has no top and the volume is fixed at V, what dimensions minimize the surface area? Please help me find the COMPLETE dimenssion of the box.

**Math**

what are the complete dimensions?

**Math**

A box has a bottom with one edge 7 times as long as the other. If the box has no top and the volume is fixed at V, what dimensions minimize the surface area?

**math**

What is the answer to t=100(n+3)? Solving for N.

**physics**

In a daring rescue by helicopter, two men with a combined mass of 172-kg are lifted to safety. (a) If the helicopter lifts the men straight up with constant acceleration, is the tension in the rescue cable greater than, less than, or equal to the combined weight of the men? Ex...

**Math**

State domain, range, period, vertical asymptotes, zeros, symmetry and y-intercept of y = -2tan(3x + 180°) + 3 I just need to know if there is a formula to find the vertical asymptotes, symmetry, and zeros or do I have to solve it graphically. Thanks.

**Calculus**

How do you take the derivation of the following function and equate to zero? sqrt of (100t^2-320t+400).

**Physics**

1325N

**science**

How does oxygen production relate to the rate of photosynthesis?

**Earth Science**

If the continental crust were thinner than its average thickness of 40 km, would it depress the mantle more or less than it does now? Explain.

**calculus**

Let A(x) be the area of the rectangle inscribed under the curve with vertices at (-x,0) and (x,0), x > 0. a. Find A(1). b. What is the greatest value of A(x)? Justify your answer. c. What is the average value of A(x) on the interval 0 < x < 2?

**earth**

the area around the great lakes was once covered by thick sheets of ice. Use the principal of isostasy to explain how the melting of these ice sheets has effected the land around the lakes?

**Precalculus**

Find dy/dx if y= (6x sqrt(x^3) (-2(cubic root of x+ pie^4).

**Math**

The coordinates of P are (-2,5) the coordinates of Q are (6,1). What is the equation of the perpendicular bisector of PQ? *I was able to figure out that the slope of line PQ is -1/2 and the equation of PQ is -1/2x+4=y

**Physics**

88.2N and UP

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