Thursday
July 31, 2014

Posts by Sarah


Total # Posts: 3,850

mathematic
ans of c ???? is 1 ????

statistics
its wrong :(

statistics
can any one tell me the ans of D plz ???

physic
1. Given the following velocity-time graph: V-T Graph 10 Velocity, m/s 5 10 15 Time -10 a. Calculate the displacement at the end of 20 seconds.

Geometry
A simple graph G has 200000 edges and for any 3 vertices v,w,x, at least one of the edges vw,wx,xv is not present in G. What is the least number of vertices that G can have?

Math
The squares of a 2×500 chessboard are coloured black and white in the standard alternating pattern. k of the black squares are removed from the board at random. What is the minimum value of k such that the expected number of pieces the chessboard is divided into by this ...

Physics
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.

Algebra
What is the largest prime factor of 5^8 +2^2 ?

Calculus help!
Describe the following surface and give traces where available: 16x^2 + 16y^2 - 9z^2 = 0

physics
the gravity on mars is 3.69 meters/second^2. if you had a pendulum on mars that was 1.8 meters long. what would the period be?

Chemistry
Which two elements is the second transition series (y through Cd) have four unpaired electrons in their 3+ ions?

Chemistry
An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with NaOH. The appropriate reactions are as follows: Citric acid: H3C6H5O7 (aq) + 3NaOH (aq) -> 3H2O (l) + Na3C6H5O7 (aq) Tartaric acid: H2C4H4O...

Chemistry
Estimate how many microwave photons with 1=12 cm must be absorbed to raise the temperature of your eye by 3 degree C. Assume the mass of an eye is 11 g and its specific heat capacity is 4.0 J/g/k

geomerty
Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07

math
would it be 3 pi 4 sq units

Physics
Here's a neat trick. If your average ceramic bowl has a mass of 200 g, what is the difference in Newtons between the weight of the bowls on the top of her head before and after she does the trick?

chem
Chromium(III) chloride(aq) + potassium sulfide(aq) what are the products of this reaction

chem
takes 190. seconds for a sample of carbon dioxide to effuse through a porous plug and 295 seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.

Biology
Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.

Science 8R - help!
why... would I ask for geography this have something to do with SCIENCE (aka food webs) What is consumers???

chem
For the following combination of reactants, enter the formulae of the products in the space provided and give their states. (Separate multiple products with a comma ",". Type your answer using the format Na2SO4(aq) for Na2SO4(aq). Do not balance the equation. If ther...

chem
oops just the last part

chem
I actually figured out how to do that one. but i have another one Question Part Points Submissions Used 1 –/1 0/4 Total –/1 .This question has some parts which are scored using special conditions. Question Part 1: A deduction of 10% of the points for this question wi...

chem
How many grams of TiCl4 are needed to produce 17.8 g of titanium? what equation do i use?

Algebra
A freight train leaves Chicago traveling West at 35 mph. An hour later a passenger train leaves Chicago traveling on a parallel track at 60 mph. How far from Chicago will the passenger train catch up to the freight train?

L.o
Identify nd describe 3 environmental health hazards tht cause ill health,crises nd disasters in south africa?

chem
The half-life of is 30.0 days. What fraction of a sample of this isotope will remain after 16.2 days?

math
if 1,x,y is a geometric sequence and x,y,3 is an arithmetic sequence, compute the maximum value of x+y

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4

chemistry
Given the thermochemical equation below, calculate the amount of energy released when 250. g of NaOH (molar mass = 40.0 g/mol) reacts with an excess of HCl. Report answer to the correct number of significant figures in units of kilojoules, kJ. NaOH + HCl --> NaCl + H2O delt...

math
for for like a. it would be (2, 4) and (-1, 1)?

math
find the points of intersection of the following pairs of equations. a. y=x^2 and y=x +2 b. y=x^2 and y=8-x^2 c. y=x^2 and x=y^2

history
which president raises soft money in order to help democrat candidates in the 1996 election

Physics Eletric fields and coulomb's law)
Can someone solve this please

constitution/essay
Write your paper about a hypothetical proposal that is before the elected school board for the public schools in your city. The proposal stirs deep controversy in the community. Opponents claim that it would violate the Constitution’s prohibition against an “establis...

CHEMISTRY
Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the NaOH?

Science Help! Ms. Sue Please!
8. Which of the following explains why the chemical products from a reaction have a different mass than the chemicals at the beginning? The products are heavier and sink. The products are lighter and rise. The products are a gas and escape into the air. The products are a soli...

math
1)find the sum of the odd integers from 25 to 75 2)find the sum of the first 20 terms in the series 10+5+2.5+1.25... . please show the steps to solve the problem^_^

chemistry
i responded on it but i dont think you saw it

chemistry
If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?

chem
i got 89593.2 but its wrong

chem
If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?

chem
A hydrogen-oxygen fuel cell operates on the simple reaction given below. H2(g) + 1/2 O2(g) H2O(l) If the cell is designed to produce 1.8 A of current, and if the hydrogen is contained in a 2.9 L tank at 200. atm pressure at 25°C, how long can the fuel cell operate before t...

chemistry
what is the word and balanced chemical equation for oxalic acid and marble?

chemistry help!!
nsider the following electochemical cell. Pt | Cr3+ (2.7010-4 M), Cr2+ (0.500 M) || Pb2+ (0.0710 M) | Pb Calculate the voltage of the cell, Ecell, including the sign.

Finance
Andy's total assets are $2,500,000, net profit margin is 5% of sales, dividend payout ratio of 60%, and the ratio of its spontaneous liabilities to sale is 20%. If sales rise from their present level of $5 million by%1,000,000 next year, what will be the firms needs for di...

Finance
anderson inc has 5,000,0000 debt at 10% per year, sale of 10,000,000, a tax rate of 40% and a net profit margin of 6%, what is anderson's times interest earned ratio?

science
Pt | Cr3+ (2.7010-4 M), Cr2+ (0.500 M) || Pb2+ (0.0710 M) | Pb Consider the following electochemical cell. Calculate the voltage of the cell, Ecell, including the sign.

chem
In acidic solution copper(I) ion is oxidized to copper(II) ion by nitrate ion. I got Cu^+(aq) + NO_3^-(aq) --> Cu^2+(aq) + NO_3^2-(aq)but itswrong

chem
for the E0cell i got 2.35 and for Q i got 8.186 then when i plugged that into the equation i get 2.7101V is that correct? I plugged 1 in for n.

chem
3 Ce4+(aq) + Cr(s) ¨ 3 Ce3+(aq) + Cr3+(aq) What is the emf of this cell when [Ce4+] = 2.9 M, [Ce3+] = 0.11 M, and [Cr3+] = 0.015 M?

chemistry
If the equilibrium constant for a one-electron redox reaction at 298 K is 7.8 104, calculate the corresponding ÄG° and E°cell. how would i set this problem up?

BIO
You can easily do this by using a biology textbook or searching it on google.

chemistry
then do you subtract the given cell potential from that?

chemistry
A voltaic cell that uses the reaction Tl3+(aq) + 2 Cr2+(s) ¨ Tl+(aq) + 2 Cr3+(aq) has a measured standard cell potential of +1.19 V. determine E‹red for the reduction of Tl3+(aq) to Tl+(aq).

calculus
Find the length of the curve over the given interval: x=t+1 y=ln cos(t) for t=0 ---> t=pi/4

precalc
1. A plane is headed at 122 degrees with an air speed of 350mph in a wind that is blowing from 38 degrees. Find the ground speed of the plane and the speed of the wind if the actual flight was at 133 degrees. 2. A plane is heading at 20 degrees at 300mph If a wind is blowing f...

Histroy
Religious tolerance

chem
would it be this? Cd(s) + Cl2(g) + 2e==> Cd^2+(aq) + 2e + 2Cl^-(aq)

chem
y dont you use Pt for the second equation?

chem
A voltaic cell consists of a strip of cadmium metal in a solution of Cd(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge connects the two beakers. Write the equation for t...

ap chemistry
The volume of 0.100 mol of helium gas at 34°C is increased isothermally from 1.00 L to 4.50 L. Assuming the gas to be ideal, calculate the entropy change for the process.

chem
La(s) ¨ La(OH)3(aq) (basic solution) Complete and balance the following half-reactions

Tourism Industry
Which of the following is a key tourism management challenge caused by the seasonality of demand, but greatly impacting service quality? A. revenue share B. loyalty systems C. access restrictions D. condo rating systems E. human resource scheduling

tourism industry
Governments invest in many different industries, including the tourism industry. As a result, economic impact studies are conducted to assess the ______________ of this government spending. A. TFC B. TSA C. MUI D. ROI E. TEI

chem
hoiw do you know that? is it teh only one?

chem
From the following list, identify the ions that are more easily reduced than H+. Fe2+(aq) Al3+(aq) Cr3+(aq) Ag+(aq) Sn4+(aq)

HISTORY
how did the US support Diem's regime between 1954-1964?

Newton's Laws
1. An 1760 kg car is moving to the right at a constant velocity of 2.94 m/s. (a) What is the net force on the car? (b) What would be the net force on the car if it were moving to the left? 2.A freight train has a mass of 6 107 kg. If the locomotive can exert a constant pull of...

chmistrye
Using the data in this table of the thermodynamic quantities for selected substances and given the pressures listed, calculate ƒ¢G at 25‹C for each of the following reactions (a) N2(g) + 3 H2(g) ¨ 2 NH3(g) PN2 = 2.0 atm, PH2 = 5.4 atm, PNH3 = 2.2...

chem
what is the Ka equation for HCHO2 i thought it was K_{a} = [CHO_2][H^+]/[HCHO_2] but its not correct

history
Why did the US intervene in Vietnam, during the Vietnam War, and support Diem's regime for econommic reasons? Not only for America's own good but for what else?

chemistry
How many Cl atoms are in a 2.54g sample of CCl4?

math
Jose, Paul,and Dan went fishing. It was a good day, and all three of them caught a fish. Dan's fish weighed four times as much as Paul's fish, and Jose's fish weighed half as much as Dan's fish. Altogether, the three fish weighed 21 pounds. How much did each fi...

english/writing
thank you both! :)

english/writing
i want to say that the novel is a transcendentalist story of the strength of individual character

english/writing
how can i reword this sentence differently and better? it sounds wrong to me. In conclusion, The Scarlet Letter is a transcendentalist novel of the strength of individual character.

Science
How does heart rate increase? Does it double? Does it increase with the intensity of the workout? I already know the background of heart rate but have trouble with the questions above.

english/writing
Sounds so much better....Thank You! :)

english/writing
how can i write this sentence in a different way The Scarlet Letter was one of the first mass-produced books in the United States upon its release in 1850, and it received much praise and criticism for the novels supposed morbidity.

math
jose, Paul, and Dan went fishing. It was a good day,and all three of them caught a fish. Dan's fish weighed four times as much as Paul's fish, and Jose's fish weighed half as much as Dan's fish. Altoghther, the three fish weighed 21 pounds. How much did each fi...

math
jose, Paul, and Dan went fishing. It was a good day,and all three of them caught a fish. Dan's fish weighed four times as much as Paul's fish, and Jose's fish weighed half as much as Dan's fish. Altoghther, the three fish weighed 21 pounds. How much did each fi...

math
what percent of 6,350 is 1,397?

English/writinh
Im having a hard time starting my introduction for my essay. I already wrote my thesis statement which is: " In Nathaniel Hawthorne’s, The Scarlet Letter, it suggests that one must find their own internal strength and strive for individual redemption by applying the ...

chemistry
If a 1.59 mole sample of argon occupies 3.07 L at constant temperature and pressure then what volume will 4.35 moles of argon occupy at the same conditions?

Physics
d = 1/2 (a)(t)^2 = 160 m at rest, Vo = u = 0 m/s I found the final velocity by using v = u +at = 0 + (20)(4) = 80 m/s d = vt t = 160 m / 80 m/s = 2 s I might be wrong at this I know d= Vot - 1/2 (a)(t)^2 By any chance, what textbook are you using?

Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²)

Mechanics
Two objects with masses 5.60 and 2.40 hang 0.600m above the floor from the ends of a cord 8.00m long passing over a frictionless pulley. Both objects start from rest.Find the maximum height reached by the 2.40kg object

Mechanics
Two objects with masses 5.60 and 2.40 hang 0.600m above the floor from the ends of a cord 8.00m long passing over a frictionless pulley. Both objects start from rest.Find the maximum height reached by the 2.40kg object

math
Karina drew a shape with 2 pairs of parallel sides and no right angles. Which shape could Karina have drawn? A. square B. rhombus C. rectangle D. trapeziod

algebra
wrong

Algebra
Given f(x) = (x-1)(x-2) + (x-2)(x-5) + (x - 3)(x-8), what are the sum of the roots of f(x)?

physics
thank you

physics
How to calculate the series AC coupling capacitance? Is there an equation for this? Thank you for any help

chemistry
Why must the water levels be equal in a tube before measuring the volume of gas?

PHYSICS
Thanks! That works and makes sense. :)

PHYSICS
Here is one of my questions from my physics study. It tells me the answer (35 J), but how do I find that answer? I would appreciate a formula or step by step calculation. Thanks! :) A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a force of 5 N. What w...

Reading
In Ralph Waldo Emerson's "Nature", how does he show his idealism in the essay? I don't understand what the question's asking...what's idealism?? thank you!!!

Calculus
I've done p= x(3750 − 1/3x^2) and C = x(1000 + 70x + 3x^2) Profit= 3750x-1/3x^3-1000x-70x^2-3x^3= 2750x-70x^2-4/3x^3 P'(x)= 2750-140x-12x^2 Then I did the Quadratic Formula and and got 22 but it's wrong

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