Friday

July 25, 2014

July 25, 2014

Total # Posts: 239

**Chemistry 12**

calculate the Ph of a solution composed of 0.75 grams of KOH dissolved in 500ml of water. assume total ionization.

**Geometry**

Martin wants to use coordinate geometry to prove that the opposite sides of a rectangle are congruent. He places parallelogram ABCD in the coordinate plane so that A is (0, 0), B is (a, 0), C is (a, b), and D is (0, b). What formula can he use to determine the distance from po...

**Chemistry**

calculate the concentration of the silver ion remaining in the solution when 10g of solid AgNO3 is added to 50 ml of 1x10-2 M NaCl solution.

**new neutrich high school**

what is the independent and dependent variable if in every 29 minutes jogging burns 200 calories?

**Math**

Indigo Industrial, Inc. is trying to determine which, if any, of five different projects it should undertake. Indigo Industrial has a 8.25% required rate of return on projects that it undertakes. The projected cash flows for each of the projects are given in the table below: Y...

**Finance**

Capital Budgeting Problems I. Indigo Industrial, Inc. is trying to determine which, if any, of five different projects it should undertake. Indigo Industrial has a 8.25% required rate of return on projects that it undertakes. The projected cash flows for each of the projects a...

**Algebra**

What word told you to multiply 3 and pe and q and 2 instead of divide? and then why did you set them equal to each other?

**Algebra**

Also what kind of problem is this? a rate of change?

**Algebra**

On Monday, it took Helen 3 hours to do a page of science homework exercises. The next day she did the same number of exercises in 2 hours. If her average rate on Monday was p exercises per hour, what was her average rate the next day, in terms of p? I know that the answer is 3...

**Math**

How? Ann is painting a fence that is 8 1/4 times as wide as she is tall. If Ann is 5 1/2 feet tall, how many feet wide is the fence? I so confused???? Any help would be appreciated - Thank You

**physics**

Car A with a mass of 1250 kg, is traveling at 30 m/s to the east. Car B is a truck with a mass of 2000 kg, traveling to the west at 25 m/s. assume these two vehicles experience an inelastic collision but do not stick together, and car A goes off 10 m/s to the west. what will b...

**physics**

A cylinder is fitted with a piston that is connected to the bottom by a spring. The spring has a spring constant of k = 3600 N/m. The cylinder is open to air at the top and is frictionless. The radius of the cylinder is 25 mm and the piston has negligible mass. The air beneath...

**math**

A rectangular plot of land is to be seeded with grass if the plot is 22m X 28m and a 1kg bag of seed is needed for 85m^ of land how many bags of seeds are needed?

**Computer**

How do you solve this algorithm problem? Suppose that you are given a sequence of n elements to sort. The input sequence consists of n/k subsequences, each containing k elements. The elements in a given subsequence are all smaller than the elements in the succeeding subsequenc...

**Statistics**

Which of the following is not a source of caution in regression analysis between two variables? A) non-linear form. B) linear form. C) a lurking variable. D) an outlier. E) extrapolation. E?

**Statistics**

A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model y-hat = -0.4 + 0.70 (drop height) where y-hat is the predicted bounce height of the golf ball. A golf ball dropped from 71...

**Math**

A ⊆ B. Prove P(A|B)>= P(A)

**math**

a rectangular mosaic is made up of exactly 12 square tiles that have an area of 9 square inches each. If the width of the mosaic is 9 inches, what is the perimeter of the mosaic in inches

**physics**

A faint sound with an intensity of 10 -9 W/m2 is measured by an intensity-level meter. What will the reading be in dB?

**chemistry**

what is the change in temperature if 24g of water at 50 degrees C absorbs 985j of heat energy

**Math**

a 55 kg skateboarder on a 3 kg board starts coasting on level ground at 8 m/sec. Let k=3.2 kg/sec. About how far will the skater coast before reaching a complete stop?

**Math**

with x = hours at first job and y = hours at the second job y <= 25 - x which is the amount of hours you can work at the same time, y >= (150/8)- (5/8)x is the amount of money you want to make if you graph both of these equations, you can find the range you should use.

**Chemistry**

How do the following solutions show the properties of a buffer? 1) 50 ml 0.10 M NH3 + 50 ml 0.10 M NH4NO3 2) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M HCl 3) 10 ml solution #1 + 6 ml 0.10 M HCl 4) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M NaOH

**Math**

Principal 450.00 x interest rate 9.25 x compounded monthly x 4 years

**math **

the letters g and g stand for numbers. if g + 9=h + 9, what is true about g and h?

**precalculus **

A rectangular field is to be enclosed by a fence and divided into three equal rectangular parts by two other fences. find the maximum area that can be enclosed and separated in this way with 1200m of fencing.

**Physics**

I'd like to know when it is appropriate to use each formula. Im new to studying physics and its seems that there are certain situations when one formula leads to the answer, yet a derivative of that formula that should lead to the answer is incorrect. For example: the ques...

**math 6**

write an expression in terms of x for the perimeter of an isosceles triangle with 2 sides of 6 cm and a third side of 2x cm.

**chemistry**

What is the pH of pure water in equilibrium with 1 atmosphere of carbon dioxide at 25˚C? (Hint, what does 1 atmosphere of CO2 mean?)

**math**

Never mind, I guess I misinterpreted the problem because the radius actually does change

**math**

Gravel is being dumped from a conveyor belt at a rate of 40 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 22 feet high? Here are th...

**calculus**

F(x)= ln (cos theta) f'(x)

**Calculus**

Find an equation of the tangent line to the curve at the given point y^2 = x^3 (2-x) (1,1)

**Chemistry**

For the oxidation of glucose ( C6H12O6 + 2O2---6H2O +6CO2), how many moles of O2 will it take to consume 6 moles of glucose. Can someone explain it?

**Chemistry**

The nuclide 96Nb decays by a first-order process with a rate constant of 2.96 × 10-2 h-1. How long will it take for 85% of the initial amount of 96Nb to be consumed? I believe it is 5.07 hrs...

**Chemistry**

In the first order, reaction A yields products, A=0.400M initially and 0.250M after 15.0 min. What is the value of the rate constant, k?

**Chemistry**

Is the bond in the molecular orbital energy level diagram of Li2 stable?

**Chemistry**

Why does I2 have a higher boiling point than F2? And why does NH3 have a higher boiling point than PH3?

**Physics**

A fire hose 10 cm in diameter delivers water at the rate of 23 kg/s. The hose terminates in a nozzle 3.1 cm in diameter. (a) What is the flow speed in the hose? (b) What is the flow speed in the nozzle?

**science**

what needs to go out of a cell

**Physics Word Problem**

using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the su...

**Physics Word Problem**

using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the su...

**Calculus**

use implicit differentiation to find dy/dx if x^3+y^3=6xy

**Calculus**

use implicit differentiation to find dy/dx if x^3+y^3=6xy

**science**

How do you know a television change electricity into light energy? What other form energy is produced?

**science**

Where in nature could you find a source of the same energy as that provided by batteries? explain

**Math**

Use the elimination method to solve a+6b=14 and a+3b=5

**Physics**

A coil of 5 ohms resistance is connected to a battery whose E.M.F. is 6 volts. What current flows in the coil?

**math**

Your ladder is 26' long. The bottom of repunzel's window is 24 feet high. hOW FAR FROM THE TOWER SIDE SHOULD YOU PLACE THE BOTTOM OF YOUR LADDER TO RESCUE rA PUNZEL?

**calculus maths**

y=lnlog base2 x

**Science.**

You are carrying a 3.4 gallon jug full of cold water. Given that the water has a density of 1.0 grams per milliliter, and one gallon is equal to 3.8 liters, state the mass of the water in kilograms.

**Science.**

Assume a typical hummingbird has a lifespan of 4.0 years and an average heart rate of 1300 beats per minute. (a) Calculate the number of times a hummingbird's heart beats in its life, and express it in scientific notation. Use 365.24 days per year. (b) A long-lived elephan...

**Science.**

Sara has lived 18.0 years. How many seconds has she lived? Express the answer in scientific notation. Use 365.24 days per year for your calculations.

**Science.**

An atom of uranium-235 has a mass 235.043924 amu (atomic mass units). Using scientific notation, state the mass in amu of ten million such atoms.

**Science.**

Express 0.0000000000375 in scientific notation

**Math**

what is 2.15x10^5 miles per hour squared converted to meters per second squared?

**Physics**

What is the centripetal acceleration of the Moon? The period of the Moon's orbit about the Earth is 27.3 days, measured with respect to the fixed stars. The radius of the Moon's orbit is RM = 3.85 · 108 m.

**physics**

Which one of the following statements is true for two bodies having same kinetic energy but different masses? a. they have same velocity b. they have same momentum c. the momentum of smaller mass body is smaller than the other d. the momentum of smaller mass body is larger tha...

**Physics**

Young acrobats are standing still on a circular horizontal platform suspended at the center. The origin of the two-dimensional Cartesian coordinate system is assumed to be at the center of the platform. A 30-kg acrobat is located at (4 m, 9 m), and a 36-kg acrobat is located a...

**Physics**

The answer is supposed to be 1.27e+06 mph, but I'm not sure how to solve for it.

**Physics**

How fast would a 9-g fly have to be traveling to slow a 1910-kg car traveling at 61 mph by 6 mph if the fly hit the car in a totally inelastic head-on collision? Could someone explain the steps, please?

**Physics**

An engine expends 44.0 hp in moving a car along a level track at a speed of 13.9 m/s. How large is the total force acting on the car in the opposite direction of the motion of the car?

**Microeconomics**

What has the video gaming industry done from a microeconomic perspective? Furthermore, analyze the gaming industry with a specific emphasis on jobs created by the gaming industry and how do they pay? How is it developing? What are the expectations, salary, and opportunities of...

**Science**

How can the parent rock or bedrock effect the environment?

**Differential Calculus**

y = 1 + (x-1)^(1/2) Considering the interval (2,4), calculate delta(y) and dy. would delta(y) be: delta(y) = f(4) - f(2) = (1 + squr(3) ) - 2 = squr(3) - 1 and dy is 1/(2 squr(x-1)) dx Thank you

**Algebra**

help me solve this exponential problem P to the 3rd power times q 5 over 2 all over q to the 2nd power times r to the negative 6.

**Accounting**

A woman would like to open a store in 8 years. She figures she will need 50,000 in capital to do so. She will make 10% on her money. a. How much would she need to invest today in one lump sum to end up with 50000 in 8 years? I got 23,325.25 b. if she's starting from scratc...

**Chemistry**

Rank the following ionic compounds by lattice energy. Highest to Lowest LiCl MgO Na2O Beo Na2S

**Chemistry**

Rank the following ionic compounds by lattice energy. Highest to Lowest LiCl MgO Na2O Beo Na2S

**Astronomy**

You've been told the Earth puts out 0.070 [W/m squared] as a global average. What would you predict would be the surface heat flux in [W/m squared] from a planet that is 70% larger in radius than the Earth, but has the same bulk composition. You can assume the only source ...

**physics**

B=u0*I*N/L u0=4pi*10^-7 I= .61A N=240 L=.018m B=.0102T Multiply B times an increase of 120 Answer=1.2T

**Chemistry**

Hi, Please provide assistance on the following problem. I worked out part of it, but do not know what to do after calculating pH for HCl. Suppose you dissolved 0.0365 grams of HCl in water to give a final volume of 10.0 mL. The molar mass of HCl is 36.5 g/mole and the molar ma...

**Algebra**

Help please (x^3 + 3x^2 - 2x+7)/(x+1)=11 I don't how how to solve this at all-the answer should be 11 but I don't have a clue how to get it-please show me this one so I can hopefully do my homeowrk-we did this in class today but I don't understand it

**Math**

A restaurant owner has a luncheon special that consists of a cup of soup, half of a sandwich, and a beverage. She wants to advertise that a different luncheon of three items can be purchased 365 days of the year for $4.99 apiece. If she has 7 different kinds of soup and 6 diff...

**Chemistry**

The reaction 2NO2--->2NO+O2 has the rate constant k= 0.68 m-1s-1. If the initial concentration of NO2 is 9.30×10−2 M, how long it would take for the concentration to decrease to 2.00×10−2 M ? please answer and show the steps

**Physics**

Are you serious? If I knew how to get started I wouldn't be here. There are actually 2 more parts to the question that I didn't even post, because I just needed help with the first part. And for the record my name is Jeremy.

**Physics **

An enemy ship is on the western side of a mountain island. The enemy ship can maneuver to within 2520 m of the 1850 m high mountain peak and can shoot projectiles with an initial speed of 260 m/s. If the eastern shoreline is horizontally 305 m from the peak, what is the minimu...

**CHEMISTRY**

At ordinary body temperature (37 C) the solubility of N2 in water in contact with air at ordinary atmospheric pressure (1.0 atm) is 0.015 g/l. Air is approximately 78 mol % N2. a)Calculate the number of moles of N_2 dissolved per liter of blood, which is essentially an aqueou...

**math**

what are you asking? if you are asking 45 and 1/5 times 3/4, then the answer is 33.9

**Chemistry**

Thank you!!!!

**Chemistry**

At ordinary body temperature (37 C) the solubility of N2 in water in contact with air at ordinary atmospheric pressure (1.0 atm) is 0.015 g/l. Air is approximately 78 mol % N2. a)Calculate the number of moles of N_2 dissolved per liter of blood, which is essentially an aqueous...

**Chemistry**

A dilute aqueous solution of an organic compound soluble in water is formed by dissolving 2.35 g of the compound in water to form 0.250 L solution. The resulting solution has an osmotic pressure of 0.605 atm at 25 Celsius. Assuming that the organic compound is a nonelectrolyte...

**Physics **

You are driving south on a highway at 24.0 m/s (approximately 54 mi/h) in a snowstorm. When you last stopped, you noticed that the snow was coming down vertically, but it is passing the windows of the moving car at an angle of 26.6° to the horizontal. Calculate the speed o...

**Chemistry**

How many grams of sulfur (S8) must be dissolved in 100.0 naphthalene (C10H8) to make a 0.13 solution? answer in grams.

**Chemistry**

Which is more soluble in water: HCl or ethyl chloride?

**Chemistry**

Which is more soluble in water: propionic acid or sodium propionate?

**Chemistry**

which is more soluble in water: cyclohexane or glucose?

**physics**

the brake linings of the wheels of a car have total mass 4.8kg and specific heat capacity 1200 J kg -1 K-1. calculate the maximum possible temperature rise of the brake linings when the car (of mass 800kg) travelling at 15 ms-1 is brought to rest by applying the brakes.

**Chemistry**

Gasoline is a mixture of hydrocarbons, a major component of which is octane,CH3CH2CH2CH2CH2CH2CH2CH3. Octane has a vapor pressure of 13.95 torr at 25 degrees celcius and a vapor pressure of 144.78 torr at 75 degrees celcius. Use these data and the equation in part (a) to calcu...

**math**

$166

**Chemistry**

By using the Clausius-Clapeyron equation,lnP=Hvap/RT +C , derive the relationship between the vapor pressures,P1 and P2, and the absolute temperatures at which they were measured,T1 and T2 .

**bshs 402**

1. What are four alternative theoretical approaches to personal helping listed in your text? 2. What are four basic steps identified by Parad, Selby and Quinian (1976) in crisis intervention that are designed to help the client return to pre-crisis level of functioning? 3. Acc...

**physics**

A diver jumps horizontally off a cliff with an initial velocity of 5.4 m/s. The diver strikes the water 4.5 s later. What is the vertical velocity of the diver upon reaching the surface of the water?

**math**

tell which place value positions need to be regrouped after mutiplying a single digit and 2 digit number like 3x29

**physics**

The brick shown in drawing the is glued to the floor. A 3500-N force is applied to the top surface of the brick as shown. If the brick has a shear modulus of 5.4 109 N/m2, how far to the right does the top face move relative to the stationary bottom face?

**Physics**

When a quarter, a nickel, a penny, and a dime are flipped; what are each of their revolutions per minute?

**physics**

A fighter pilot dives his plane toward the ground at 485 m/s. He pulls out of the dive on a vertical circle. What is the minimum radius of the circle, so that the normal force exerted on the pilot by his seat never exceeds three times his weight?

**English**

I'm writing an essay involving analysis of a short story. I need to put in-text citations after quotes, etc. The short story was read online so there is no page number, etc. How do I cite this-I'm really confused. I looked in Purdue Online Writing Lab but that's no...

**Marketing**

Pick a product or service and explain the nature of consumption by Hispanic, African American, or Asian consumers. Why does consumption differ from the other groups? You are required to find 2 sources to support your paper (newspaper articles, books or academic articles).

**fourth grade math**

40o,000