Saturday

April 19, 2014

April 19, 2014

Total # Posts: 537

**Math**

Richard Simons is selling his house. He has a choice of taking $125,000 today or $135,000 in 6 months. If he takes the money today, he can invest it at Valley Bank at 5% interest compounded monthly. a) How much would be in the account after six month if he took the $125,000. b...

**math**

A man has 21 coins in his pocket, all of which are dimes and quarters. If the total value of his change is 405 cents, how many dimes and how many quarters does he hav

**physics**

How many excess electrons are there in a typical lightning bolt that has about 16 C of charge? Answer 1 x 1020 1 x 1019 10 1 x 1016

**statistics**

A multiple choice exam has 20 questions; there are four choices for each question. A student guesses the answer to every question. Find the chance that he guesses correctly between four and seven times. Find the minimum score the instructor can set so that the probability that...

**social**

Season 3 episode 6 apparently, at least one of the early episodes in season 3

**Chemistry**

Consider 51.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.210. What volume of water must be added to make the pH = 5.000 I've tried everything but I am not getting the right answer!

**strayer**

In a survey of a TriDelt chapter with 50 members, 21 were taking mathematics, 32 were taking English, and 6 were taking both. How many were not taking either of these subjects?

**health**

A. Digestion, movement, absorption B. Digestion, elimination, restoration C. Digestion, absorption, elimination D. Digestion, absorption, restoration

**health**

What three processes does food undergo in the digestive system?

**World Geography**

Central America & Carribean

**World Geography**

a What are the major groups that blended to form the culture of this region? b What are some major sources of income in the economies of Central America and the Caribbean? c What forms of music have evolved in the region?

**8th grade Science**

Please help I'm not very sure about my answer

**8th grade Science**

In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this evid...

**math**

2. Assume you working on the house pictured below. The length of the house is 50 feet, the width is 30 feet, and from the ground to the gable (the height of the rectangle) is 10 feet. The height of the triangular prism on top is 6.5 feet.

**physics**

A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds

**math**

Michelle buys 18 oz ofa certain cereal for $1.14. What was the price per pound of the cereal to the nearest cent?

**MITx: 2.01x**

are you shure i put this Q2_1_1 TXC=-t_0*L and its wrong and this one c) x=2*L too

**Math/Algebra**

Find the standard equation of an ellipse with the given characteristics and sketch the graph. Vertices at (0,-5), and (0,5); Foci at (0,-4)and (0,4).

**Math/ Algebra**

Find the slope-intercept equation of the line that satisfies the given conditions. Then graph the line. Contains points P=( -1,4);parallel to the line with equation 3x+y =5

**Math/ Algebra**

Graph each liner equation and locate the x and y intercepts y/2-3x/5=1

**Math/ Algebra**

Graph each liner equation and locate the x and y intercepts y/2-3x/5=1

**physics**

An automobile and train move together along parallel paths at 28.8 m/s. The automobile then undergoes a uniform acceleration of −4 m/s 2 because of a red light and comes to rest. It remains at rest for 63.8 s, then accelerates back to a speed of 28.8 m/s at a rate of 1.5...

**Writing skills 1**

1. Which of the following is correct in regard to the use of formal English? A. Formal English is used more frequently in speaking than in writing. B. In formal business correspondence, it's best keep the language impersonal. C. Contractions are considered acceptable in a...

**Chemistry**

I just to know how to identify the substance that is reduced, the substance that is oxidized, the oxidizing agent and the reducing agent in each reaction. As (s) + ClO3-(aq) → H3AsO3 (aq) + HClO(aq) CN-(aq) + MnO4-(aq) → CNO-(aq) + MnO2(s) C2H5OH + MnO4- → C2...

**chemistry**

9.88*10^-6 m

**wesley**

there will be a coin toss to determine the winner of the $5 million prize. You are offered $100,000 for your ticket right now. What would you do?

**Chemistry**

Calculate the pH of a 50.0 mL solution 0.0120 M ethylaminium chloride (C2H5NH3Cl ) and 0.0360 M ethylamine C2H5NH2. Kb = 4.3 x 10-4 Calculate the pH when 5.0 mL of 0.1 M HI is added. Ignore any changes in the volume

**Chemistry**

Which is the strongest acid, CCl3COOH or CH2ClCOOH please explain WHY it is stronger.

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base wit...

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base wit...

**physics**

both a) and b) are 0.024

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base wit...

**chemistry**

If your equation of the line for you SAM analysis is y=1x+0.3436, what is the concentration of MgO in W/w% in your unknown with a mass of 0.1018?

**chemistry**

If your equation of the line for you SAM analysis is y=1x+0.3980, what is the concentration of Mg in ppm in your unknown solution?

**math**

C

**Life orientation**

Global warming,air pollution and water pollution

**PreAlgebra**

Math estimate quotient 6 1/3 divided by 3 1/7

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2

**Chemistry**

How do you solve this: if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? (the answer is 45.7 g). CS2 + 3O2 -> CO2 + 2SO2

**Chemisrty**

the equation is supposed to say: CS2 + 3O2 -> CO2 + 2SO2 * O2 not 3CO2

**Chemisrty**

How do you solve this: if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? (the answer is 45.7 g). CS2 + 3CO2 -> CO2 + 2SO2

**Chemistry**

if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2 SO2

**Chemistry**

if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2 SO2

**Calculus**

16/5=21

**accounting**

24000 pounds of product a can be sold for $8 per pound

**Geometry**

320

**Calculus**

14

**Algebra**

432.5

**GEOmetry..**

20

**Chemistry**

The decomposition of hydrogen peroxide is first order in H2O2: 2H2O2(aq) → 2H2O(l) + O2(g) Rate = k [H2O2] How long will it take for half of the H2O2 in a 10-gal sample to be consumed if the rate constant for this reaction is 5.6 x 10-2 s-1?

**Chemistry**

Never mind I figured it out Ln(At)=-(.152min-1)(120min)+ln(10) Ln(At)= -18.24+(2.30) Ln(At)=-15.9 e^At=e^-15.9 At= 1.19 x 10^-7 %=1.19 x 10^-7 x 100 =1.19 x 10^-5 % of the isotope

**Chemistry**

I've figured out most of it. I'm not sure how to find the percentage ofd the isotope. Define the half life. The half-life of a radioisotope is found to be 4.55 minutes. If the decay follows first order kinetics, what percentage of isotope will remain after 2.00 hours i...

**Chemistry**

I need to know the kcal/mol. How do I find the kcal/mol??

**Chemistry**

I've figured out the Ea but I'm not sure how to find the kcal/mol The gas reaction N2O5 → 2NO2 + 1/2O2 follows the Arrhenius equation k = Ae(-Ea/RT) where R = 8.314 J K-1 mol-1 and 1 calorie = 4.184J. At the temperature T=273K, k = 3.46 x 10-5 s-1, whereas at T =...

**Chemistry**

. For the reaction 2H2(g) + 2NO(g) → N2(g) + 2H2O(g) The observed rate law is Rate =k[NO]2[H2] The mechanisms shown below have been proposed to explain the kinetics of the above reaction Which of the following are acceptable mechanisms? Explain you answer Mechanism I 2H2...

**Chemistry**

I've tried to answer some -The reaction mechanism for a reaction is as follows… Step 1 O3 (g) + NO2 (g)→ NO3 (g) + O2 (g) slow Step 2 NO3 (g) + NO2 (g) → N2O5 (g) fast a. Write the overall reaction equation. b. Identify the molecularity of each step. They ...

**Chemistry**

Given…Overall reaction: 2 NO2 (g) + F2 (g) → 2 NO2F (g) Rate = k[NO2][F2] a. Can this be a single step reaction? b. Postulate a mechanism using experimental data and chemical intuition come up with a mechanism that fits.

**7th Math**

What is the function rule for 2,30 4,15 6,10 10,6 12,5 15,4 30,2

**Chemistry**

First find the moles of HCl by dividing .15/36.45 and then once you find the moles divide that by the liters given which in this case is 8 and that will give you the molarity which you can plug into -log(H+) and that should give you 3.3 as the answer.

**trig**

If cot x = .78, what is tan x?

**physics**

A 0.145-kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 38 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let the positive axis lie ...

**chemistry**

How do I find mols?

**chemistry**

A solution contains 0.02755 g of a protein in 25.0 mL of solution. The osmotic pressure is 3.22 torr at 298 K. What is the molecular weight of the protein?

**Chemistry**

Lauryl alcohol is obtained from coconut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene freezes at 4.2 oC. What is the approximate molar mass of lauryl alcohol. Refer to the text book for the boiling point of pure benzene. (80 C...

**Chemistry**

Arrange the following aqueous solutions in order of increasing boiling point, explain your answer: 0.120 m glucose (C6H12O6), 0.05 m LiBr, 0.05 m Zn(NO3)2. Using data the boiling point constants given in the test book, calculate the boiling points of each of the above aqueous ...

**Chemistry**

What is the % mass of 12 M hydrochloric acid. Density of 12 M hydrochloric acid solution is 1.18 g/mL and the density of water is 1.00 g/mL

**Chemistry**

How many grams of sulfuric acid is in 25.0 g of 8.00 % H2SO4 solution?

**Alagbra 2**

0.125

**Math**

Find the intergral of (1+x)/sqrt(3-x^2)

**Calculus**

Find the intergral of (1+x)/sqrt(3-x^2)

**chemistry**

anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?

**Chemistry**

Why don't you tell me how you approached the problem and then I can see for myself. There's a general method of doing this so I figure you'd know and get some kind of answer. My question wasn't if you could check my work; my questions are clearly indicated with...

**Chemistry**

The first-order rate constant for the decomposition of N2O5, 2N2O5(g) --> 4NO2(g) + O2(g), at 70 degrees C is 6.82 x 10^-3 s^-1. Suppose we start with .0208 mol of N2O5(g) in a volume of 2.2 L. How many minutes will it take for the quantity of N2O5 to drop to .014 mol? I...

**physics**

A patient has a far point of 29.2 cm and a near point of 24.2 cm. What power (in diopters) should be prescribed to correct the patient's vision using: (b) glasses which are worn 0.5 cm away from the patient's eyes?

**physics**

A patient is going to be prescribed bifocals which will be 2.50 cm from the eye. The prescribed powers (in diopters) for the bifocals are +1.60 and -0.40, and these bifocals give the patient normal vision. (a) Without the bifocals, what is the patient's near point? cm (b) ...

**Chemistry**

Explain the following phenomena in terms of intermolecular forces. Determine the major type of forces between the molecules. a) You can't clean grease off you hand with water only b) Pancake syrup is more dense than olive oil. Please provide the structure of both in your d...

**English**

I must combine the following sentences in the most effective way. Is my answer correct? Sentences: 1. He didn't cover his vehicle with the traditional camouflage. 2. He covered it with his own drawings. My answer(s) - Not sure which is the best way: He didn't cover his...

**English**

I must improve the organization of these four sentences of a paragraph in the most effective way. Is my answer correct? Sentences: 1. The reader has probably figured out that the boy named Walter was Walter Elias Disney. 2. During his lifetime Disney and his staff created 18 a...

**English**

Question: How can I rewrite this sentence to maintain the 3rd person academic tone? Is my answer correct? 1. You have probably figured out that the boy named Walter was Walter Elias Disney. My answer: One has probably figured out that the boy named Walter was Walter Elias Disney.

**English**

Question: How can I rewrite this sentence to maintain the 3rd person academic tone? Is my answer correct? 1. You have probably figured out that the boy named Walter was Walter Elias Disney. My answer: One has probably figured out that the boy named Walter was Walter Elias Disney.

**english**

I must combine the following sentences in the most effective way. Is my answer correct? 1. Walter loved animals. 2. He especially loved watching them in the forest near his Missouri home. My answer: Walter loved animals, especially watching them in the forest near his Missouri...

**english**

I am to create a timeline that illustrates the history of children's literature in western culture using five key milestones of children's literature. Can you please tell me if these milestones I have chosen would be correct to use: 1-invention and development of print...

**physics**

A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm. (a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if negative)? (b) How tall is the lamp's image if the lamp is a distance...

**Social Studies - URGENT**

Is 4 character of place?

**Social Studies - URGENT**

1. Movement 2. Character of Place 3. Movement 4. Region 5. Region

**Social Studies - URGENT**

Using the five themes of geography, which theme best illustrates each statement: Location, character of place, human-environment interation, movement or region. 1. Islam spread to Eastern Europe from Southwest Asia 2. The Scandinavian countries share common influences from the...

**math**

The number of patients treated at Dr. Artin’s dentist office each day was recorded for nine days. These are the data: 6, 6, 6, 5, 5, 6, 5, 6, 5. Find the mean, median, mode, and range of the data. If necessary, round to the nearest tenth

**Physics**

A 17kg child slides down a 2.7m -high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

**Physics**

A car is traveling at 10 m/s. By what factor does the car's kinetic energy increase if its speed is doubled to 20 m/s?

**Physics**

Part A: A cardinal (Richmondena cardinalis) of mass 4.50×10^−2 kg and a baseball of mass 0.142 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude p(c) of momentum to the magnitude p(b) of the baseball's momentum? Part B: A man we...

**math**

pedro swam some laps in the pool and then swam 2 more.... algebraic expression

**math**

estimate each quotient 246.78/83?

**science**

what happens to a liquid when it releases enough energy?

**Chemistry**

Can someone help draw/explain the Lewis Dot Structure for OPBr3. I've tried different things, but none of them seem to work.

**Math**

In a lightning storm, the number of seconds between the flash and the bang varies directly with the number of miles you are from the lightning. It takes 15 seconds for the thunder sound to reach you from lightning that is 3 miles away. If the thunder sound reaches you in 1 sec...

**Math**

When you scuba dive, the added pressure due to the water varies directly with your depth. At 20 feet, the added pressure is about 9 pounds per square inch. a) If an amateur diver can safely stand an added pressure of 30 (psi), how deep could he dive? b) A sunken submarine lies...

**Chemistry**

Why is energy released in order to react two atoms to form a compound? For instance the reaction between sodium metal and chlorine gas is highly exothermic and produces NaCl(s). Meanwhile when an atom loses an electron, it will be endothermic. Can someone try to explain this a...

**Math**

The distance between two towns on a map varies directly with the actual distance between the towns. Seven and a half inches on the map represents 150 miles. What is the actual distance represented by 11 inches on the map?

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