Thursday

July 24, 2014

July 24, 2014

Total # Posts: 3,841

**physics**

A single circular loop of wire of radius r = 2.5cm rotates at a frequency of 60 Hz in a constant magnetic field of magnitude B = 1.8 T. Use this to design a generator that produces an induced emf of 430 V. Hint: You must choose values for the number of loops and the area of ea...

**algebra**

at a restaurant brandy paid twice as much as Katie and Katie paid $3 more than Stephanie if the total combined amount they paid was $56 how much did Katie pay

**Finite Math**

A political scientist has received a grant to fund a research project involving voting trends. The budget of the grant includes $3200 for conducting door-to-door interviews the day before an election. Undergraduate students, graduate students, and faculty members will be hired...

**Chemistry 1**

In the spectrum of a specific element, there is a line with a wavelength of 486 nm. Use the Rydberg equation to calculate the value of n for the higher energy Bohr orbit involved in the emission of this light. Assume the value for the lower energy orbit equals 2.

**Chemistry 1**

A dilute solution of hydrochloric acid with a mass of 614.86 g and containing 0.33004 mol of HCl was exactly neutralized in a calorimeter by the sodium hydroxide in 619.41 g of a comparably dilute solution. The temperature increased from 15.529 to 19.691°C. The specific he...

**Integral question**

1) find the integral from 1to -1 if(5sinx-2tanx+3x^5)dx 2) find the integral of x^3/(x^4+1)dx

**Derivatives**

Find the derivative of xsecy+y^5=5x^3-7

**Calc please help**

Find the derivative of f(x) (csc(2x^2+1)^4

**Calc please help**

That is where I am confused ...

**Calc please help **

Limit as x approaches zero (1/x-1/tanx)

**Chemistry**

I need to calculate the mass of CO2 produced in the reaction of NaHCO3 + HCl Data Mass of NaHCO3 = .05g Mass of system before reaction 117.9 g Mass of system after reaction 117l98 Maxium pressure 1.4094 initial pressure 1.0094 pressure change .4 temp 299.2K

**Stats**

The following data represent the number of live births in the United States in 2007 for women 15 to 49 years old. Age Live Births 15 - 19 445,045 20 - 24 1,082,837 25 - 29 1,208,405 30 - 34 962,179 35 - 39 499,916 40 - 44 105,071 45 - 49 7,349 Find the following: 1. What is th...

**Math**

Assume that you are drawing two balls without replacement from an urn that contains 13 green balls, 10 blue balls, and 1 red ball. What is the probability that you will draw a blue balls and a red ball?

**Math please help**

Find the smallest value on function (3/x)+(4/1-x) on interval (0,1)

**Math please help!**

Find lim as x approaches 0 of (e^x-1-x/2-x^3/6)/(x4)

**math**

?? but the ans is 0, 72 ,144,216,288,360 degree

**math**

Solve the equation cos3x=cos2x for 0¡Üx¡Ü360

**Math please help!!**

Find the derivative of (2^x-e^x)/(2^x+e^x)

**Math help!**

Find derivative using logarithmic differentiation F(x)= secx^cotx

**Math help!**

Find the derivative of tan(ln(5x))

**Math help!**

Find the derivative. F(x)=x^4+x^2+1/(x^2+1)

**math please help!**

Find the derivative if f(x)= e^-3x times sin(4x) use the product rule.

**Math- urgent**

Thank you!

**Math- urgent**

How do you find the sine, cosine, and tangent of a triangle?

**Microeconomics**

How do costs play into your everyday life? For example, why might it be cheaper to drive on a toll-road vs. a free-access interstate? Also, can you identify situations where you may fall victim to the sunk cost fallacy (we all do)?

**trig**

A weight attached to a long spring is bouncing up and down. As it bounces, its distance from the floor varies periodically with time. You start a stopwatch. When the stopwatch reads 0.3 seconds, the weight reaches its first high point 65 cm above the ground. The next low point...

**civics**

WOW im dumb today it must be C?

**civics **

How is the direct democracy similar to a representative democracy ? A. both types of government are run by a communist party. B.Both types of democracy give power to the elected representative. c.Both types of democracy give power to the elected representative. D. both types o...

**algebra**

X^9/x^2 H^14/h^5

**history**

wow i know what Writeacher said but she is accusing me of being some one else if you don't see in the comment

**history**

im just here to get some help

**history**

wait you cant acuss me of being someone that im not

**history**

no i dont know who that is

**history**

i dont know my teacher didnt send me one

**history**

hi i new to this and i need help with some world history questions and i don't have a book and I've already researched it and i did not find nothing. The conquest of new lands allowed Romans to A. increase the number of Roman citizens. B. decrease the number of slaves ...

**composition**

an animal i wanted for pet

**Algebra**

Find the coordinates of the image after a reflection in the given line. [-8, 1, -7] [-7, -5, 1]; y axis I am really bad with these types (matrices) of questions, please help me.

**physics**

An Angry Bird sits on a clothes line midway between the two poles. bird on line If the combined weight of the bird and rope is W, what is the tension in the rope in terms of θ and W? Select one: a. W cosθ / sinθ b. W tanθ c. W/(2sinθ) d. W/(2cosθ)

**physics**

An aircraft has an initial mass of m0 and an initial acceleration of a0. After flying for 2 hours, the mass of the aircraft has decreased by 11%, due to the burning of the fuel. If the propulsive force provided by the engines is constant, what is the expression for the new acc...

**college physics**

A car travels around a bend of radius R at a speed v1, experiencing a centripetal acceleration ac. The car then travels around a curve with the same radius R, but with a centripetal acceleration which has twice the magnitude of ac. What speed is the car moving, when going arou...

**English**

Thank you, Ms. Sue. :-)

**English**

Read the following lines from "An Arab Shepherd Is Searching for His Goat on Mount Zion." Searching for a goat or a son has always been in the beginning of a new religion in these mountains Which of the following sentences best explains the meaning of these lines? Th...

**Guidance in early childhood education**

What are some ways that could create an encouraging classroom?

**Guidance in early childhood education**

What are some ways that could create an encouraging classroom?

**chemistry**

thanks for replying back Keq=(x)(x)/(0.1-x)(0.1-x) Keq=x^2/x^2-0.2x+0.01 do i take the square root of each side and then...

**chemistry **

initially 1 mol each of gaseous carbon dioxide, co2(g) and hydrogen h2(g) is inhected into a 10.0L reaction chamber at 986 degrees. What is the predicted concentration of each entity at equilibrium? the equation is as follows: co2(g)+ h2(g)= co(g)+h20 (g) k=1.60 at 986 degrees

**math**

Do you like have a graph or something

**math**

simplify. what are the excluded values? x^2+6x+9/5x+15

**Science**

Which one of the following factors would not speed up a chemical reaction

**geometry**

Concrete can be purchased by the cubic yard. How much will it cost to pour a slab that is 17 ft by 17 ft by 4 ft if the concrete costs $50.00 per cubic yard?

**Chemistry**

if you produce 5.7 of H2O, how many liters of O2 will be required?

**chemistry**

One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury(II) oxide is reduced to mercury. HgO(s) + H2O( ) + 2 e– Hg( ) + 2 OH–(aq) If 2.3 10–5 amperes flows continuously for 1200 days, what mass of Hg( ) is ...

**math**

The current river flows at rate of 4mph. In order for a boat to travel 24 miles up river and then return in a total of 5 hours how fast must the boat be able to travel in still water?

**Math (Quadratic Equations)**

A field is bound on one side by a river. A farmer wants to enclose the other three sides of the field with fence in order to create a rectangular plot of land for his cows. If the farmer has 400m of fence to work with, determine the maximum possible area of the field and the f...

**Language Check 2 Writeateavher**

I need help with 2,3 ,5, 6,7 , 9 PLEASE

**Language Check 2 Ms.Sue**

Correct capitalization, punctuation, and spelling. 1. We keep a variety of emergency equipment in the trunk of our car, a first-aid kit, jumper cables, a blanket, a flashlight, and road flares. A. car a first-aid B. car: a first-aid C. car; a first-aid D. car: a 1st-aid E. Cor...

**Language Check Ms.Sue**

I really don't. Can you explain the answer up each one. This is just for practice

**Language Check Ms.Sue**

I need help with 2, 3, 5, 6 PLEASE

**Language Check Ms.Sue**

Choose correct capitalization, punctuation, and spelling. 1. Thank you for you're prompt response to my request information about traveling to Australia. A. Thank you for youre B. Thank you for youre' C. Thank you for your D. Thank you for your' E. Correct as is MY...

**Math**

Add: 2/y^2 - 3x/y-x - 3/y

**Sam**

How?

**physics**

Thanks for your help, but I think that it is wrong. I keep getting 1.13 m/s as the answer, so I don't know if I went wrong somewhere.

**physics**

Yes, I think we are supposed to assume that it is in water.

**physics**

A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?

**physics**

A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...

**physics**

A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...

**physics**

A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...

**chemistry**

An 0.727 mol sample of argon gas at a temperature of 22.0 °C is found to occupy a volume of 26.2 liters. The pressure of this gas sample is how many mm Hg?

**chemistry**

1. A 2.00 g sample of a particular compound was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85ºC. For pure CCl4, TB = 76.50ºC and KB = 5.03°C·kg/mol Calculate the boiling point elevation, ΔTB...

**chemistry**

A 2.00 g sample of a particular compound was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85ºC. For pure CCl4, TB = 76.50ºC and KB = 5.03°C·kg/mol Calculate the boiling point elevation, ΔTB, ...

**chemistry**

The acid dissociation constant, Ka, for this reaction is given by the following formula (this is also in your book): Ka=[H3O+][A−][HA] The acid concentration, [HA] is given in the introductory information of this problem. Using this information and your answers from the ...

**chemistry**

The chemical reaction for dissociation of an acid is: HA + H2O → H3O+ + A- Assuming all of the hydronium ion (calculated in in the previous problem) comes from this reaction, what is the concentration of conjugate base, [A-], in this system?

**chemistry**

The pH of a 0.00100 M solution of a particular acid is 4.95 at 25°C. Use the solution pH to calculate the concentration of hydronium ion present [H3O+]

**physics**

Consider a rectangular swimming pool of depth 2.3 m with a width and length of 13 m. What is the force exerted by the water on one of the sidewalls of the pool?

**Spanish 1**

How do you respond to these spanish questions? ¿Como se llaman tus padres? ¿De donde son? ¿Donde trabajan? ¿Cuantos hermanos tienes?¿Como se llaman?Donde estudian o trabajan? Cuantos primos tienes?Cuales son los apellidos de ellos?¿Cua...

**statistics**

Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0 *please help me solve this! I have no clue what I am supposed to do

**Math -Help**

you have a space in your garden for 100 small flowering bulbs. Crocus bulbs cost $0.45 each, and daffodil bulbs cost $0.85 each. Your budget allows you to spend $55.80 on bulbs. How many crocus bulbs and how many daffodil bulbs can you buy?

**Biology**

The gene encoding for body color in zombie flies is "X-linked". Gray bodies are the wild-type trait and blue bodies are caused by a mutation - Set up a cross between a male with a blue body and a female who is homozygous dominant for a gray body. Indicate the geno an...

**Biology**

Punnett Square Help 1) Set up a Di-hybrid cross for these two traits (pod color and shape) Note:Green pods are dominate over yellow pods and inflated pods are dominant over constricted pods -Start off with both parents as heterozygotes/hybrids for BOTH genes and assume the gen...

**Math- urgent**

4.9 So $4.90?

**Math- urgent**

Harry buys American cheese at the deli. He buys 1/4 pound at the cost of x dollars per pound. If he pays $12.25 for 2.5 pounds of cheese, what is the cost per pound? Please show your work.

**Math- urgent**

Thank you!

**Math- urgent**

Z/2-6=4 What does z equal? Please show your work.

**Physics**

A glass window pane has an area of 3.50 m2 and a thickness of 0.600 cm. If the temperature difference between its surfaces is 23.0°C, what is the rate of energy transfer by conduction through the window?

**health**

Which symptoms are more common in depressed children and adolescents than in adults with depression? A. Fears of separation B. Reluctance to meet people C. General aches and pains D. All of the above

**health**

I think its with b or c?

**health**

What is major depressive disorder? A. A disorder that is enabling and helps a person function normally B. A disorder characterized by symptoms that interferes with a person’s ability to work, sleep, study, eat, and enjoy once-pleasurable activities C. A disorder character...

**budgiting**

Which one of the following statements best describes a budget "blind spot"? A. Too little money was set aside to cover an expense. B. This is an expense the person overlooked or did not account for when setting up the budget. C. This is an item that requires periodic...

**Health**

The ________the concentration of HIV in semen or genital fluids, the more likely it is that HIV will be transmitted to a sex partner. A. Lower B. Weaker C. Higher D. All of the above

**Health**

________ is the most frequently reported bacterial sexually transmitted disease in the United States. A. Chlamydia B. Syphilis C. Herpes D. Gonorrhea

**Math- urgent**

How can -2.65 be written as the ratio of two integers?

**Chemistry**

For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.

**DrBob222**

Just for my understanding if you don't mind could you explain how you were able to get 5e? I was able to derive everything else except that portion.

**Math**

Bobo bought a 1 ft squared block of cheese. He needs to cut it into 3 in. cubes. The block is yellow outside but green on the inside. How many 3 in. cubes does it have? How many of the cubes have no yellow face, one yellow face, 2 yellow face, etc. Please help!!!

**Algebra**

Bobo bought a 1 ft squared block of cheese. He needs to cut it into 3 in. cubes. The block is yellow outside but green on the inside. How many 3 in. cubes does it have? How many of the cubes have no yellow face, one yellow face, 2 yellow face, etc. Please help!!!

**Chemistry**

That's brilliant help :) thank you so much

**Chemistry**

im just stuck on how to do the last part. 5.00 = 4.74 + lot (15/x) Solve for x = millimoles acetic acid and convert that to grams in 500 mL solution ? thank you very much

**Chemistry**

Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetat...

**Calculus**

When one-sided limits are not equal to each other at a point, what can be said about the continuity of the function at that point? I know that when one-sided are not equal to each other then the limit does not exist at that point. but i do not know what can be said about the c...

**Calculus**

Use the alternate definition, lim x->a f(x)-f(a)/x-a, to determine the instantaneous rate of change of f(x)= 1/x at the point (1,1/5) a)1/5 b)-1/5 c)1/25 d)-1/25

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