Friday

November 28, 2014

November 28, 2014

Total # Posts: 332

**Physics help - Waves and Sound Questions**

1) A 1.50-m long gas column that is open at one end and closed at the other has a fundamental resonant frequency 80.0 Hz. What is the sound speed in this gas? a) 120 m/s b) 30.0 m/s c) 480 m/s d) 213 m/s e) 53.3 m/s 2) You drop a stone down a well. You hear the splash 2.23 s ...
*November 25, 2014*

**physical science**

A 3Kg bar of aluminum has to be heated form 25 degreesC to 75 degreesC . how many calories are needed to achieve this temperature increase?
*November 18, 2014*

**Algebra**

The number of bass in a lake is given by P(t) = 2800/1 + 6e^−0.05t where t is the number of months that have passed since the lake was stocked with bass. (a) How many bass were in the lake immediately after it was stocked? 400 bass (b) How many bass were in the lake 1 ...
*November 17, 2014*

**Math**

Jack has 5 apples Sahara has 13 apples. They each got the same amount times the number they already have. How much apples does jack and Sahara have now.
*November 17, 2014*

**Physics help **

A blacksmith at a historical reenactment is making an iron hinge. after placing the iron (0.750 kg) in the fire and shaping it with his hammer it is still at 200 C. he puts the iron piece in an 8 L bucket of water at 25 C. what is the final temp. of the iron (assume it is in ...
*November 13, 2014*

**Physics Help Please!**

an isolated container holding 5 kg of sulfuric acid is at 60 C. if 2.49x10^5 Joules of energy were transferred out of the acid, what would be the new temp. of the acid?
*November 13, 2014*

**chemistry**

the frequency factor and activation energy for a chemical reaction ate A=4.8 x 10^-12cm^3 and Ea=11.1kJ/mol at 327 K respectively. Determine the rate constant for this reaction at 327K
*November 11, 2014*

**Physics help please **

A blacksmith at a historical reenactment is making an iron hinge. after placing the iron (0.750 kg) in the fire and shaping it with his hammer it is still at 200 C. he puts the iron piece in an 8 L bucket of water at 25 C. what is the final temp. of the iron (assume it is in ...
*November 7, 2014*

**Physics Help Please!**

A block of mass is moving along the horizontal frictionless surface with a speed of 5.70 m/s. If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? Show step by step please! ...
*November 5, 2014*

**Algebra**

Sorry, but I did not post my question twice.
*November 4, 2014*

**Algebra**

A veterinarian uses 300 feet of chain-link fencing to enclose a rectangular region and also to subdivide the region into two smaller rectangular regions by placing a fence parallel to one of the sides, as shown in the figure. (a) Write the width w as a function of the length l...
*November 4, 2014*

**math**

write an equation to represent the statement"four less than the product of three and x is twenty-three" 3x - 4= 23 4x - 3x = 23 4x - 3 = 23 3 - 4x = 23
*November 3, 2014*

**chemistry**

The antacid in question (with an active ingredient of Ca(HCO3)2), upon treatment with excess hydrochloric acid, a 0.413 g sample gives 92.85 mL of CO2 at 25.00oC and 1.000 atm. What percentage of the antacid is active ingredient? Assume a perfect system (i.e. the yield is 100%)
*November 1, 2014*

**chemistry**

a 0.96 millimole sample of Na2CO3 gave 0.9 millimoles of CO2 gas. If a 0.376 g of pure Na2CO3 was reacted with excess acid, what volume of gas will be measured on this apparatus
*November 1, 2014*

**Chem Help**

what is meant by the following question give a detailed experiment design for the conversion of 2-methyl-2-butanol to 2-methyl-2-butene on the 0.2 molar scale. I dont need help with the experimental design I just didnt understand what is meant by 0.2 molar scale. thanks!
*October 29, 2014*

**Organic Chem Help Please!**

if you used 40 g of cyclohexanol and obtained 24.6g of pure cyclohexene, a) what is your w/w yield? b) what is your theory yield? Thank you !
*October 29, 2014*

**Chem Help Please!**

Explain why the stability of alkyl carbocations is: tertiary > secondary > primary > methyl Thanks!
*October 21, 2014*

**Pre-Calc**

A point on the terminal side of an angel theta is given. Find the exact value of the indicated trigometric function (-1/5,1/2 ) find cos theta
*October 20, 2014*

**Physics Help Please!!!! Check!**

if I weigh N on Earth and 5320 N on the surface of a planet, what is the acceleration due to gravity on that planet? mg=702N m=702/9.8=71.6 kg mg=5320N g=5320/71.6=74.3 m/s^2
*October 17, 2014*

**Physics Help Please!!!! Urgent!!**

1) A 10 kg lead brick rests on a wooden table. if a force of 46N is required to slide the brick across the table at a constant velocity, what is the coefficient of friction? 2) A horizontal force of 100N is applied to a 200 kg refrigerator sitting on a horizontal surface. the ...
*October 16, 2014*

**Chem Help Please!**

Give the full mechanism for the reaction of 1-bromo-3-methylpentane with methanol. I know you cant draw on here. but can you tell write it out with words? Thanks!
*October 14, 2014*

**6th grade math**

Hi I'm a parent and I'm trying my best to help my son but I need help. The problem is... Find two positive decimals a and b that make the following statement true. Then find two positive decimals a and b that make the statement false. If a < 1 and b < 1, then a ...
*September 17, 2014*

**Organic chem Extraction of caffeine from tea**

What is the name used for the mixture of the upper and lower layers that did not completely separate when you allowed the mixture to settle? What type of compound could cause the layers not to separate cleanly? If you obtained a poor separation of your phases, suggest two ...
*September 16, 2014*

**Physics Help Urgent Please!!!**

A crane is used to lift air conditioning units to the top of a 5-story building. Each story is 3.5 m high. The crane accelerates the units while lifting the units past the first story and then lifts them at a constant velocity past the second through fourth stories. it hen ...
*September 15, 2014*

**Physics Help**

An industrial die machine is used to stamp out holes in pieces of sheet aluminum. the die strikes the surface of the street of metal at a speed of 10 m/s, passes through the 0.635 cm thick sheet, reverses its direction, and is again moving at 10 m/s as it passes the top ...
*September 14, 2014*

**Physics Need Help**

The pile driver struck the piling with a speed of 20 m/s. At what height did the pile driver hammer have to be lifted for it to fall freely and attain that speed before striking the piling? Show steps please!!!
*September 14, 2014*

**Math**

A dress is on sale for a 15% discount, meaning 85% of the price remains. If the sale price of the dress is $51, then the original price of the dress was $.
*June 30, 2014*

**english 2**

You should probably try looking the example essay in the textbook. Then try and see what you can come up with.
*June 26, 2014*

**Sciene**

Is Meiosis actually Mitosis happening twice? My answer- Yes because they are both a cell division process.
*May 10, 2014*

**statistics**

A quality supervisor for a factory that makes cell phone cases examines a sample of 46 cases. She finds that 8 cases are the wrong size. Which is the best prediction of the number of cases that will be the wrong size in a shipment of 3,000? A.)410 B.)475 C.)506 D.)522
*May 7, 2014*

**Math**

The regular pentagon have a perimeter of 18.8 units. What is the value of X?
*April 12, 2014*

**spanish**

Using the subject “usted” and the verb in the imperative, tell your instructor three things she or he must do. Then tell your instructor two things she or he must not do. You will be graded on accuracy and pronunciation. Provide your sentences in Spanish.
*April 7, 2014*

**spanish**

Usted debe corregir las pruebas. Usted tiene que darme más tiempo. Usted debe ir con nosotros. Usted no debe mascar chicle. Usted no tiene porqué hacerlo, que lo hagan ellos.
*April 7, 2014*

**Calculus**

The amount of carbon-14 still present in a sample after t years is given by the function where C0 is the initial amount. Estimate the age of a sample of wood discovered by an archeologist if the carbon level in the sample is only 18% of its original carbon-14 level.
*March 26, 2014*

**Calculus**

If 40 milligrams of strontium-90 radioactively decays to 12 milligrams in 30 years, find its half-life (the number of years it takes until half of it remains). Use the formula A = p ⋅ e−kt, where p is the amount and A the (smaller) final amount.
*March 26, 2014*

**english**

So, the correct answer is A
*March 21, 2014*

**english**

Which one of the following is a correct example of the singular possessive case? A. king's rights B. audiences' reaction C. women's club D. who's job I think it's C.
*March 21, 2014*

**Statistics **

1. A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows: Eating Habits Scores Baseball Players Football Players Basketball Players 34 27 35 18 28 ...
*March 20, 2014*

**Calculus Help Please!!! **

Find an equation of the tangent line to the curve at the given point. ((pi/6),(2 square root of (3)/3)) y = sec (x)
*March 20, 2014*

**I got the answer **

Thank you!
*March 16, 2014*

**Calculus Help**

Use logarithmic differentiation to find the derivative of the function. y = (tan x)^(7/x)
*March 16, 2014*

**Calculus Help Damon**

Use implicit diff. to find dy/dx of each of the following. This is the question
*March 13, 2014*

**Calculus Help **

In the following x,y and (a) are all variables. Show steps please! Thank you! 1) y^2 = x^2+a^2 2) y^2+ay = x^2+ax+a^2
*March 13, 2014*

**Math**

A 6ft. person casts a 4ft. shadow. Next to the person, a lamppost casts a 30ft. shadow. How tall is the lamppost?
*March 6, 2014*

**English**

Read the conversation at a peer review for Ben’s short story. “It seems your central character has a really cool power: being able to hear what others are thinking,” Tom said. “Actually, I think it was more of a jinx,” replied Ben. “Being able to ...
*February 9, 2014*

**physics**

Two buses leave downtown one is headed southwest the other is headed northeast. Do they have the same velocity? Why or why not?
*February 7, 2014*

**math**

how do I arrange these fraction or mixed numbers in order from smallest to largest 1)5/6,5/7,-3/4,2/3,9/11,-3/7 and 2)2 1/2, -7/2,-2 1/3,2 4/5,2 3/8.
*December 22, 2013*

**Math**

A group of students went.to their favorite restaurant after the football game one friday night
*December 8, 2013*

**civics**

In modern society, what do we mean when we refer to the dividion of labor? A} the specializatoon of jobs in tthe medical field B}splitting work equally between two people C{all the jobs peopkle do are connected to other jobs D} the ways joconstruction jobs are organized I ...
*November 28, 2013*

**us history **

I am second guessing myself on these Any help is appreciated which of the following is true with regards to the navigation acts by the eighteenth century? A} the navigation act of 1696 abolished the american customs service b the acts replaced the colomial admirality courts c ...
*November 26, 2013*

**us histery**

I am unsure of some of my answers. I have tried looking, I am lost.. I would appreciate any help.. Thank you in advance. I am double checking which of the following statements is true regarding the korea war A} stalin approved the north korean attack in advance b stalin was ...
*November 26, 2013*

**history**

at the constitutional convention in pj hiladelphia, madison drafted the plan presented by virginia govenor randolph, and william patterson of ____ presented a plan that was similiar to the articles of confederation. Thank you in adavance, I was stuck on 3
*November 18, 2013*

**history**

sir george grenville, king georges chancellor of the exchequer, enacted the revenue act of 1764 to raise rebenue for maintenance for the british army in america. In the colonies it was commonly known as the ___ act? Thank you in advance.. I have a few I am compketely stuck on
*November 18, 2013*

**american history**

which utopian community was founded and established in new york state
*November 18, 2013*

**8th Grade Math**

How do I enter this with two decimal places and not a percent? 0.18811922 Is it 0.19?
*October 27, 2013*

**physics**

A ball is thrown horizontally from the top of a building 32.3 m high. The ball strikes the ground at a point 110 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion. Answer in units of s
*October 14, 2013*

**Math**

You spend 1/2 of your allowance on Monday. On Tuesday, you spend 1/2 of the amount you have left. On Wednesday, you spend half of what remains. What fraction of your allowance do you have left?
*September 25, 2013*

**Intermediate Algebra**

add or subtract the following polynomials as indicated (5.9x to the 3rd power+3.4x to the 2nd power - 7)-92.9x to the 3rd power -9.6x to the 2nd power +3)
*September 7, 2013*

**Intermediate Algebra**

for the polynomial function h(x)=2x to the 4th power-x to the 3rd power+2x to the 2nd power -4x-3 evaluate h(3)
*September 7, 2013*

**Intermediate Algebra**

name the type of polynomial and give its degree for 7x to the 3rd power + 6x to the 2nd power -2=
*September 7, 2013*

**Business**

Essie and Ruby sell Blu-Ray players. Last month Essie sold 35 less Blu-Ray players than Ruby. Together they sold 145. How many Blu-Ray players did Essie sell?
*August 9, 2013*

**Math**

John currently has a square garden. He wants to redesign his garden and make it into a rectangle with a length that is 3 feet shorter than twice its width. He decides that the perimeter should be 60 feet. Determine the dimensions, in feet, of his new garden. Please show work.
*July 30, 2013*

**Vegetarian**

why do vegetarians need to be careful about their protein intake?
*June 23, 2013*

**Nutrition-Help Please**

Answer to second part of the question: Height, weight, age and gender are the primary factors that most directly affect basal metabolism by affecting LBM.
*June 21, 2013*

**Nutrition-Help Please**

What does LBM (muscle mass) have to do with BMR? Identify the four primary factors that most directly affect basal metabolism by affecting LBM.
*June 21, 2013*

**Math**

5/36,5/45
*April 28, 2013*

**Math **

Inductive reasoning please determine the next three numbers in patern 15,5,5/3, 5/9, , , ,
*April 28, 2013*

**chemistry**

Given the chemcal equation:2 Ca+O2>2 CaO,if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted. True or False?
*April 15, 2013*

**chemistry**

Given the chemcal equation:2 Ca+O2>2 CaO,if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted. True or False?
*April 15, 2013*

**chemistry**

Given the chemcal equation:2 Ca+O2>2 CaO,if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted. True or False?
*April 15, 2013*

**chemistry**

Given the chemcal equation:2 Ca+O2>2 CaO,if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted. True or False?
*April 15, 2013*

**Statistics**

The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
*March 15, 2013*

**Math**

Find the derivative of the given function. f(x)=(ãx+9x)(x^3/2-x) f '(x) = ?? Evaluate f '(x) at the value x = 4. f '(4) = ??
*March 7, 2013*

**math**

Find the slope m and an equation of the tangent line to the graph of the function f at the specified point. F(X)=x^2/x+6;(3,1) m = ?? y = ??
*March 7, 2013*

**math **

f(x)=(ãx+9x)(x^3/2-x) Evaluate f '(x) at the value x = 4. f '(4) = ??
*March 7, 2013*

**math**

Find the derivative of the function f by using the rules of differentiation. f(x)= 4x^4/3-2/3x^3/2+7x^2-3x+1
*March 4, 2013*

**math**

Find the derivative of the function f by using the rules of differentiation. f(x)=(9x^3+3x^2+10x-6)/(x)
*March 4, 2013*

**math**

thank you soo much I understand it now!! :)
*March 4, 2013*

**math**

Find the slope m of the tangent line to the graph of the function at the given point and determine an equation of the tangent line. f(x)=7x-5x^2 at (-2,-34) m = ?? y = ?? .
*March 4, 2013*

**math**

Let f be defined as follows. y=f(x)=x^2-12x (a) Find the average rate of change of y with respect to x in the following intervals. from x = 5 to x = 6 ?? from x = 5 to x = 5.5 ?? from x = 5 to x = 5.1 ?? (b) Find the (instantaneous) rate of change of y at x = 5. ??
*March 4, 2013*

**Math Please Help!!**

that wasnt right
*March 1, 2013*

**Math Please Help!!**

Find the slope and the equation of the tangent line to the graph of the function f at the specified point. f(x)=-10/3x^2+6x+6; (-1, -10/3) slope ?? tangent line y = ?
*March 1, 2013*

**math**

Find the derivative of the function f by using the rules of differentiation. f(x)=7x^4/3-2/3x^3/2+2x^2-5x+1 f '(x) = ??
*March 1, 2013*

**math**

he was wrong
*March 1, 2013*

**math**

Find the slope and the equation of the tangent line to the graph of the function f at the specified point. f(x)=-10/3x^2+6x+6; (-1, -10/3) slope ?? tangent line y = ?
*March 1, 2013*

**Excel formula help**

Formula to multiply the number in cell 4k times standard deviation of the numbers in cell z2 through z10 I don't understand cell z2 through z10 I have never had excel (4kxz2xz10) Please write this correctly
*January 27, 2013*

**Excel help**

How would I write a formula to multiply the number in cell k4 times the standard deviation of the numbers in cell z2 through z10
*January 27, 2013*

**Excel help please**

I don't know how to do any excel
*January 27, 2013*

**Excel help please**

How would I write a formula to multiply the number in cell z675 times the number in cell a1
*January 27, 2013*

**Computers excel**

How would you write a formula to divide the quantity of cell c1 plus c 8 by the number in a 98
*January 25, 2013*

**Excel**

How would you write a formula to divide the number in the cell v45 by the number in cell b78
*January 25, 2013*

**Excel computers**

How would you write a formula to multiply the number in cell k4 times the standard deviation of the number in cell z2 through z10
*January 25, 2013*

**operating system**

How would you write a formula to multiply the number in a cell z675 times the number in cell a 1
*January 25, 2013*

**Biology**

A blue eyed man whose parents were brown eyed marries a brown eyed woman whose father was brown eyed whose mother was blue eyed they have one female child who is blue eyed make a pedigree chart based on the information above.
*January 18, 2013*

**Math-Calculus**

Volume using disk method: x=.000574y^(2)-.439y+185 Interval: (0,500)
*December 6, 2012*

**math**

A jet is flying through a wind that is blowing with a speed of 45 mi/h in the direction N 30° E (see the figure). The jet has a speed of 775 mi/h relative to the air, and the pilot heads the jet in the direction N 45° E.
*December 2, 2012*

**science**

can you please tell me which catergory these belong in chemical or physical property? 1. arrangement of particles have changed 2. absorb or release. energy(endothermic/exothermic reactions) 3. change in appearance only. 4. cant be undone. 5. size and shape may change
*November 28, 2012*

**history **

most republicans in the late 1800 were protestants who their party as the defender of traditional American values true or false?
*November 12, 2012*

**CHEMISTRY**

Okay, I think i understand the second question. moles=MxV so... moles=(24.5ml)(0.10M NaOH) = 2.45 moles ??
*October 22, 2012*

**CHEMISTRY**

Not for homework, just practice problems I'm having trouble with. Knowing that one mole of KHP, C8H5O4K, reacts with one mole of NaOH, what mass of KHP is required to neutralize 30.0 mL of the 0.10 M NaOH solution? if 24.5 mL of the 0.10 M NaOH solution is required to ...
*October 22, 2012*