# Posts by Dan

Total # Posts: 1,192

**Physics**

Those "i" things before the "C" were supposed to be micro for microcoulombs

**Physics**

An object carries a charge of -8.0 ìC, while another carries a charge of -2.0 ìC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5ìC Object 2- Qavg...

**chemistry 12**

hey i was wondering, i have this question: Sketch a pH curve for the titration of 40.00mL of 0.100 M hydrazine, H2NNH2, having a K of 3.0x10^-6 by 0.100 M HCIO4 i know you can t sketch but could you tell me what to do with the "K of 3.0x10^-6" i could sketch the ...

**MAth**

A rectangle is 15 inches long and 6 inches wide. What is the area of the rectangle?

**Math**

If triangle ABC is similar to triangle DEF and the perimeter of ABC is 4 times greater than the perimeter of DEF , what is the relationship between the areas of the triangles?

**Physics**

You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the ...

**math**

Solve the following problems using Partial Quotients a. 7752/17 b. 651/3

**math**

The number of dogs and chickens on a farm add up to 14. The number of legs between them is 36. How many dogs and how many chickens are on the farm if there are at least twice as many chickens as dogs?

**math**

Find the sum of the arithmetic progression 4 + 9 + 14 + 19 + …….94 + 99 + 104

**science**

close, you need to change your theta. A) 250(1.7)cos35 B) 250(3.2)cos55 this will work, just did it for my homework and they are correct. My E and A are different but the theta was the same.

**Finance**

John Jones buys a flat screen TV costing $1200. He pays $200 down and finances the balance at 15% add-on interest, to be repaid in 18 monthly installments. Find the finance charge

**AP CHEMISTRY**

Thank you very much

**AP CHEMISTRY**

Please could you help me predict the products of the following reactions: ( I cant figure them out) THANX in advance! 1) CaO powder is added to distilled water. 2) Acetic acid solution is added to solid sodium hydrogen carbonate. 3) Potassium permanganate solution is added to ...

**math**

If E and F are events with P ( E ∩ F ) = 0.09 and P ( E F ) = 0.3 , P ( F E ) = 0.4 Find P (F )

**ALGEBRA II**

ln(x+5)=4 COULD YOU SHOW HOW TO SOLVE THIS STEP BY STEP. THANX!

**Physics**

Sorry - got cut off. I meant to supply R * V(rel) = Ma

**Physics**

A railroad car moves under a grain elevator at a constant speed of 3.70 m/s. Grain drops into the car at the rate of 580 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? F = Ma -> R * V(rel)

**US HISTORR**

why did the league of nations not pursue italy? Like after WW2. Did the Italians get angry because of something the league of nation did or didn't do for them ?

**US HISTORY**

why did the league of nations not pursue italy? Thanx!

**US HISTORY**

thanx!

**US HISTORY**

what decided the outcome of the 2000 election??

**AP CHEMISTRY**

Thanx!!!

**AP CHEMISTRY**

What does a negative value for a standard potential indicate? PLEASE HELP!!

**Geometry**

no one has posted one. im screwed

**CHEMISTRY**

yeah i get that, and so what would you write acetic acid as, just the same?? And also thanx for explaining above

**CHEMISTRY**

Write the formulas for the following substances as they would appear in a total ionic equation: a) Aqueous acetic acid b) solid lithium carbonate c) Aqueous ammonia d) Aqueous sodium dihydrogen phosphate I don't know, do we have to write the formula [like ammonia is NH3] ...

**CHEMISTRY**

Use the solubility rules to predict whether the following substances are soluble or insoluble in water: a) K2CrO4 _______________ b) NiSO4 _______________ c) Cu(OH)2 ______________ d) Pb(C2H3O2)2 __________ e) Ag2CO3 _______________ f) Al2S3 ________________ Please help me ...

**physics**

An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.

**physics**

how do you solve for Potential Energy?

**physics**

In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m. (a) Find the work done on the train. 1 J (b) Find the change in kinetic energy. 2 J (c) Find the ...

**Physics**

I got 15.6 but it was wrong? Ace raised a 14.0-N physics book from a table 72 cm above the floor to a shelf, 2.20 m above the floor. What was the change in potential energy?

**physics**

Pam has a mass of 33.0 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 15.0 m and Pam acquires a speed of 60.0 m/s. (a) What is the magnitude of the force? 1 N (b) What is Pam's final kinetic ...

**ENGLISH 11**

Could someone please tell me the following for each person in the book THE GREAT GATSBY; -Age, Work, and Major Accomplishment for: Daisy Buchanan, ------Jay Gatsby, & ------Jordan Baker

**algebra**

Simply 5 hours.. 125 miles/25 miles/hour = 5 hours

**Physics**

Cost ($) = Power (kW) x Price ($ / kWh) x Time (h) Cost ($) = (0.006 kW) x ($0.12) x (365 days/year x 24 h/day) Cost = $6.3072

**Living a Healthy Life**

the answer should be C. pretty confident about that. :)

**Physics. Need urgent help.**

A scuba diver searches for treasure at a depth of 20.0m below the surface of the sea. at what pressure must the scuba device deliver air to the diver? (density of sea water= 1030kg/m^3;atmospheric pressure= 1.013x10^5 pa) another one A king's crown is said to be solid gold...

**phi 103**

the answer is apparently number one, and I choose number three as being not falsifiable. I am currently arguing my point and could use some support. My proof that three of the four claims are falsifiable are as follows. My luck may improve or it may not. I could die ...

**phi 103**

Which of the following may not qualify as a falsifiable claim? Student Answer: Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease

**Earth & Space Science**

Could someone please tell me what do you do in this class. I'm going to be a senior next year [High School] , & thinking of taking this class. And also if someone could tell me where to find notes for that class. THANK YOU!

**AP CHEMISTRY**

Could someone please tell me where to find the 2008 AP Chemistry Multiple Choice for FREE ONLINE? Thank You in advance!

**phi 103**

A claim is also said to be falsifiable, in that it could turn out actually to be false, and we know how that might be shown. For instance, "There are no wild kangaroos in Georgia" is a falsifiable claim; if we went to Georgia and found some wild kangaroos, we would ...

**phi 103**

I'm sorry, I gave the answer, "Granite is more dense than sand." It was marked as incorrect, I feel this must be an error. Thank you once again!

**phi 103**

Exactly, how I answered the question. Would you say this is answered incorrectly in the text?

**phi 103**

Which of the following may not qualify as a falsifiable claim? Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease

**phi 103**

Thank you!

**phi 103**

correct, but can always be revised necessarily true meaningless but fun correct and never needing revision

**phi 103**

strongly supported claim in science should be regarded as?

**phi 103**

If the word "should" appears in a sentence, that sentence will always involve an ethical claim

**Chemistry**

I am very confused about how to start this problem: A 29.8 mL sample of 0.354 M methylamine, CH3NH2, is titrated with 0.231 M hydrochloric acid. The pH before the addition of any hydrochloric acid is ?. The Kb of methylamine is 4.2x10^-4

**Chemistry**

How do I do this problem, I am very confused on how to even begin: An aqueous solution contains 0.167 M ascorbic acid (H2C6H6O6) and 0.194 M hydroiodic acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. [C6H6O62-] =? mol/L.

**AP CHEMISTRY**

A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine E for the cell at these concentrations. (b...

**AP CHEMISTRY**

A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. (A) Assuming that the hydroxide is 1.0 x 10^-2 M, calculate ...

**AP CHEMISTRY**

For Ni its -0.28V & for Fe its -.440V Is it right?

**AP CHEMISTRY**

A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. A. Assuming that the hydroxide is 1.0 x 10^-2 M, calculate ...

**MATHEMATICS**

how did u get those numbers?

**MATHEMATICS**

How do you find the average deviation from these numbers: 290 , 270 , 250 , 300 , & 290. I think their mean is 280

**MATHEMATICS**

A piece of notebook paper is about 0.0032 inch thick. If you begin with a stack consisting of a single sheet and double the stack 25 times, how tall will the stack be in inches? How tall will it be in feet? (Hint: Write and solve an exponential equation to find the height of ...

**AP CHEMISTRY**

A voltaic cell is constructed that is based on the following reaction. Sn2+(aq) + Pb(s) -> Sn(s) + Pb2+(aq) (a) If the concentration of Sn2+ in the cathode half-cell is 1.80 M and the cell generates an emf of +0.219 V, what is the concentration of Pb2+ in the anode half-...

**PHYSICS**

thanx!!

**PHYSICS**

Is it 32.57 cm?

**PHYSICS**

Allegra's favorite ride at the Barrel-O-Fun Amusement Park is the Flying Umbrella, which is lifted by a hydraulic jack. The operator activates the ride by applying a forcce of 72 N to a 3.0-cm-wide cylindrical piston, which holds the 20000. N ride off the ground. What is ...

**Accounting**

Presented below are selected financial statement items for Rowe Corporation for December 31, 2012. Inventory $55,000 Cash paid to purchase equipment $30,000 Cash paid to suppliers 154,000 Equipment 40,000 Buildings 400,000 Revenues 200,000 Common stock 20,000 Cash received ...

**Chemistry**

At 1 atm, how much energy is required to heat 39.0 g of H2O(s) at –22.0 °C to H2O(g) at 163.0 °C?

**AP CHEMISTRY**

The Kb for ammonia (NH3) at 25°C is 1.8* 10-5. By using the value of Kb, calculate ΔG° for the equilibrium

**calculus**

If the sun rises at 6 AM and is directly overhead at 12 noon, estimate the time (hour and minutes) when a 34-foot tree will have a 24-foot shadow.

**AP CHEMISTRY**

i still don't get the right answer i have like 1.54*10-14

**AP CHEMISTRY**

So do i plug in 270C in kelvin as my temp in the first formula???

**AP CHEMISTRY**

Consider the reaction. PbCO3(s)<--> PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0 PbO(s...

**AP CHEMISTRY**

I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: ...

**AP CHEMISTRY**

I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: ...

**Geometry**

THINK IT'S: 2x^2-8x=0 2x(x-4)=0 x=0 or x= 4

**AP CHEMISTRY**

i added info in the last question in AP CHEMISTRY

**AP CHEMISTRY**

........ deltaHf(KJ/mol)...... d.Gf(KJ/mol)..... d.S(J/mol-K) NaHCO3(s) -947.7...... -851.8 ......... 102.1 NaOH(s).. -425.6 ...... -379.5 ........ 64.46 CO2(g) .. -393.5 ...... -394.4 ........ 213.6 Hope that helps

**AP CHEMISTRY**

write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: Please help me find B

**math**

the lateral area of a pyramid that has a base 6 and height 8?

**geometry**

wat is lateral area if base is 6 and the right angle is 8

**PHI103**

strongly supported claim in science should be regarded as? necessarily true correct, but can always be revised

**PHI103**

@Ms Sue Thanks you make perfectly good sense. You "should" give yourself a pat on the back!

**trig**

If sec theta = radical 5, what is the exact value of cos theta

**trig**

If sec theta = radical 5, what is the exact value of cos theta

**Chemistry**

Calculate the equivalent mass of each of the following acids. a) HC2H3O2 b) KHCO3 c) H2SO3

**US HISTORY**

I need to end an essay on prohibition era and these are my subtopics: crimes, laws, and prohibition movements

**US HISTORY**

is there a limited amount on how much alcohol an industry can produce???

**Chemistry**

Mastering chemistry homework? Haha. E^(zero)cell= Cathode-Anode E^(zero)cell= 0.82V-.22V= 0.6V Delta G= -n*F*E^(zero)cell Delta G= -4*96485*0.6 Delta G= -231.564 J or -232 kJ

**General Chemistry 1**

Gaseous hydrocarbons, which contain only carbon and hydrogen, are good fuels because they burn in air to generate large amounts of heat. A sample of hydrocarbon with mass 1.48 g exerts a pressure of 1.32 atm in bulb with volume 967 mL at 21.5 oC. Molar Mass of this hydrocarbon...

**AP CHEMISTRY**

A 1.00-L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C.

**Chemistry**

pH = pKa + log([A-]/[HA])

**World History! help please :)**

It connects the black Sea to the Sea of Marmara. so your answer is accurate

**AP CHEMISTRY**

thanx

**AP CHEMISTRY**

Calculate the pH at the equivalence point in titrating 0.100 M solutions of each of the following with 0.080 M NaOH. A) benzoic acid (C6H5COOH) Ka= 6.3*10^-5 for it

**ALGEBRA II**

factor (2x^2 - 48)

**Trig**

A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 3 mi apart, to be angle x = 31° and angle y = 49°, as shown in the figure. (Round your answers to two decimal places.) Find the distance of the plane from point A. Find ...

**ALGEBRA II**

George jogged downhill at 6mi/hr and then jogged back up at at 4mi/hr. If the total jogging time was 1.25 hours, how far did he jog in all?

**ALGEBRA II**

does b=2???

**ALGEBRA II**

(3b-2)/(b+1) = (4)- (b+2)/(b-1) The (b+2)/(b-1) is separate from the 4. the 4 isn't included in the division

**logic application**

I need help on figuring why this is the answer. 4,5,9. i see how it all adds up.. but i am stuck on the over all reasoning

**US HISTORY**

clincher sentence on prohibition era. I want the reader to feel that they want to read more

**US HISTORY**

Could someone help me conclude an essay on prohibition. I am writing: even though there were laws and movements for prohibition, it actually didn't work. PLEASE HELPPP!!!

**US HISTORY**

could u tell how?? please