Saturday

October 22, 2016
Total # Posts: 415

**physics**

An elastic cord is 69 {\rm cm} long when a weight of 79 {\rm N} hangs from it but is 90 {\rm cm} long when a weight of 170 {\rm N} hangs from it.What is the "spring" constant k of this elastic cord?

*April 29, 2011*

**physics**

In the figure , suppose C_1 = C_2 = C_3 = 18.0 <units>\mu F</units>.If the charge on C_2 is Q_2 = 33.0 <units>\mu C</units>, determine the charge on each of the other capacitors.

*April 26, 2011*

**Physics**

@Ryan, is the "g" just gravity? Why do we need gravity in this equation? I keep doing this problem and getting the initial speed to 3.6 m/s which is not right.

*April 17, 2011*

**freedom similes and metaphors?**

As free as a bird on first flight As beautiful and precious as sparkling stars in the night

*April 3, 2011*

**Calculus**

Determine whether or not each of the following functions is invertible. Give your reasons for believing the function is invertible or not. Please check this for me. I am not sure if I am adequately explaining my answer and if my answer is right. a) y= log10(1 + 1/x) y'= ((...

*March 23, 2011*

**Calc. checking answer**

Correction to part a) NOT INVERTIBLE because I plugged in -0.5 and got a positive answer, so the derivative is then increasing and decreasing, right?

*March 23, 2011*

**Calc. checking answer**

Determine whether or not each of the following functions is invertible. Give your reasons for believing the function is invertible or not. Please check this for me. I am not sure if I am adequately explaining my answer and if my answer is right. a) y= log10(1 + 1/x) y'= ((...

*March 23, 2011*

**Physics**

The charged plates of a parallel plate capacitor each have a charge density of 3 x 10-3 C/m2. What is the electric field E between the plates?

*March 21, 2011*

**Physics**

A box of mass m which carries a charge Q slides down a frictionless inclined plane that makes an angle, theta, with the horizontal. An electric field E points from right to left. How large must E be for the acceleration down the incline to be zero?

*March 21, 2011*

**geometry**

A rectangle is 80 cm long and 20 cm wide. Find, to the nearest degree, the acute angle formed at the intersection of the diagonals.

*February 13, 2011*

**Algebra II**

How can equations and inequalities help a business maximize profit or minimize cost?

*February 1, 2011*

**calculus**

find linear approximations for each of the following and put a bound on the error of the estimate. 1. (7.985)^1/3 using f(x)=x^1/3 and a=8 2. (.9997)^100 using f(x)=x^100 and a=1 please help explain please too

*December 9, 2010*

**calc**

find linear approximations for each of the following and put a bound on the error of the estimate. 1. (7.985)^1/3 using f(x)=x^1/3 and a=8 2. (.9997)^100 using f(x)=x^100 and a=1 please help

*December 9, 2010*

**Physics**

What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.008 m-tall person standing vertically?

*December 8, 2010*

**physics**

dragonballs

*December 6, 2010*

**Science**

My teacher has asked our class to each do a 2 minute light and sound show using four different concepts... Any ideas?

*November 17, 2010*

**Physics**

The U.S army's parachuting team, the Golden Knights, are on a routine jumping mission over a deserted beach. On a jump, a 65 kg Knight lands on the beach with a speed of 4.0 m/s, making a .20 m deep indentation in the sand. With what average force did the parachuter hit ...

*October 24, 2010*

**Calc**

When you are solving for the point of intersection between planes do you follow the same steps when solve for the point of intersection between lines?

*October 17, 2010*

**Algebra 2**

Complete the system for the given number of solutions: x+y=7 2x+2y = ? infinite number of solutions

*October 13, 2010*

**physics**

A tiger leaps horizontally from a 5.5 m high rock with a speed of 3.1 m/s. How far from the base of the rock will she land?

*October 4, 2010*

**calculus**

Determine the coordinates of the point of intersection of the two perpendicular lines that intersect on the y-axis and are both tangent to the parabola given below. y = 3x2

*October 3, 2010*

**Microbiology**

Utilization of amylase producers is “big business” can you find or think of any uses for the amylase production? [think of the high soda consumption in the U.S., what makes it so sweet?]

*September 20, 2010*

**physics**

The pronghorn antelope has been observed to travel at an average speed of more than 55 km/hover a distance of 6.0 km. Suppose the antelope runs a distance of 6.0 km in the following manner: it travels 2.0 km in one direction, then turns 90 degree and runs another 4.0 km. ...

*September 12, 2010*

**geometry**

ab=3x, bc=5x, ac=8 what is x and bc?

*September 10, 2010*

**Chemistry**

Thank you

*September 9, 2010*

**Chemistry**

Ephedrine, which is used as a bronchodilator, has the chemical formula C10H15NO. What mass of H2O would be produced during a combustion analysis of 0.4817 g of ephedrine? Answer in units of g.

*September 9, 2010*

**Algebra 117**

Sorry for whatever reasons my sq root symbols didn't paste here. The problem is sq rt a + sq rt b = sq rt a+b. I think this is true, but I'm not sure why.

*September 9, 2010*

**Algebra 117**

Is this equation true or false? Why? ãa+ãb=ãa+b Okay radicals are killing me. Please explain this to me

*September 9, 2010*

**Algebra**

Is this equation true or false? Why? 20-4ã2=16ã2 With like radicands should I add the 4 to the other side of the equation? I'm really lost. Can someone please explain this to me?

*September 9, 2010*

**math**

Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. The two most frequently used measures of central tendency are the mean and median. Compare these two measures for the following characteristics: Take every ...

*September 3, 2010*

**physics**

Ab = V²/2x = -88²/(2*146) = -26.52 ft/sec² Aa = 2x/t² = 2(5280/4)/19.9² = 6.666 ft/sec² V = √[2ax] = √[2*6.666*5280/4] = 132.658 ft/sec = 90.4 mph t = √[2x/a] = √[2*5280/(4*26.52)] = 9.98 sec

*September 1, 2010*

**Psychology**

the answer is not cases

*September 1, 2010*

**Chemistry**

but one of those false true trues are wrong, just don't know which one

*July 12, 2010*

**Math: partial derivative**

z=u(v+w)^(1/2) find ∂^3z/(∂u∂v∂w) what partial derivative am I suppose to be finding exactly? Do I take the derivative of z three times? Please help. Thank you.

*July 11, 2010*

**chemistry**

171kj q=molesx heat of vaporization

*May 12, 2010*

**human service**

There are 8 important issues in fee setting within a Human Service Organization and these are those issues: 1. Direct and indirect costs 2. Depreciation and use allowance 3. Unallowable costs 4. Profit margins 5. Fixed and variable costs 6. Break-even points 7. Market prices 8...

*May 4, 2010*

**Chemistry**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E

*April 5, 2010*

**math 12**

While training for a race, a runner increases her distance by 10% each day. If she runs 2km on the first day, what will her total distance for 26 days of training?

*March 17, 2010*

**statistics**

Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how would you use these three levels in relationship to risk to patients in implementing the decisions of your research?

*March 5, 2010*

**Math**

Determine whether the given conditions are sufficient to prove that ∆PQR ∆MNO.Justify your answers. PQ≅MN,PR≅MO,QR≅NO I have no idea how to do this! Can anyone help me. Thank you

*February 14, 2010*

**Chemistry**

okk sorry amy. ps: ive never used this before ms. sue, so don't be rude.

*February 9, 2010*

**Chemistry**

also for percent yield i thought it was (actual results)/(theoretical results) X 100, so wouldnt it be 126.5g/ 55g=230??

*February 9, 2010*

**Chemistry**

well my question is the same as amy's but mine says: Determine the mass of gold that can be extracted if 24.7 g sodium cyanide is used. and If the mass of the ore from which the gold was extracted is 129.5 g, what percentage of the ore is gold? but i tried her numbers. ...

*February 9, 2010*

**Chemistry**

is this the right answer for mass of gold extracted then : 77.0 g ?? and 164.3 % percent yield??

*February 9, 2010*

**science**

help me unscramble iritoncf

*February 4, 2010*

**History**

What are some good, recent books on the Crusades that are well-suited for use in a research paper?

*January 23, 2010*

**college Managerial accounting**

Problem 47 Simon Hinson Company operates two divisions: Gordon and Ronin. A segmented income statement for the company’s most recent year is as follow: Total Company Gordon Division Ronin Division Sales $850,000 $250,000 $600,000 Less variable expense 505,000 145,000 360,...

*January 7, 2010*

**bRAIN FART**

Add all sides. Add the two lengths and the two widths.

*November 9, 2009*

**Chemistry**

wait.. that can't be right.

*November 9, 2009*

**Chemistry**

Given a 10.0g sample of MgCO3*5H2O, what weight of anhydrous magnesium carbonate can be obtained after driving off the water? 84.3g?

*November 9, 2009*

**Chemistry**

Given a 10.0g sample of MgCO3*5H2O, what weight of anhydrous magnesium carbonate can be obtained after driving off the water? The GFM of the sample is 174.3amu. Now.. how do I go about finding the weight of the magnesium carbonate?

*November 9, 2009*

**Chemistry**

CaSO4.2H2O ==> CaSO4 + 2H2O moles CaSO4.2H2O = 15.00 g x (1 mole CaSO4.2H2O/172.172) = 0.08712 moles. moles CaSO4 = same. grams CaSO4 = moles CaSO4 x molar mass CaSO4 = ?? Wait,.. how do I know the moles CaSO4? do I do .08712* CaSO4's gfm?

*November 9, 2009*

**chemistry**

so then would i find the gfm of the CaSO4? and get 136.2 as my answer?

*November 8, 2009*

**chemistry**

if you heat 15.00g of the hydrate CaSO4*2H20, and drive off the water, what is the weight of the anhydrous salt remaining? How do I go about solving this?

*November 8, 2009*

**Chemistry**

calculate the percent water in CaSO4*2H20 20.9%?

*November 8, 2009*

**Chemistry**

Ah, yes. I reversed it Thank you!

*November 8, 2009*

**Chemistry**

on heating the hydrate CaSO4*2H2O, how many moles of water should be driven off per mole of hydrate? 1 mole?

*November 8, 2009*

**Chemistry**

34.48%, percentage water of hydrate, final answer?

*November 8, 2009*

**physics**

A race car accelerates from rest at 5.7m/s squared. how fast will it be going at the end of that time? i need the abc method...( a-all variables, unknown 1st...b-right formula and algebraically rearrange it..c- solve it0

*October 20, 2009*

**statistics**

A = .0498 B = .5768

*September 28, 2009*

**HCA 240**

Radio Ad: Write a 150 to 200 word script for a radio ad that promotes a healthy musculoskeletal system in old age. Address the risk factors for arthritis, osteoporosis, and injuries from falls. Incorate prevention strategies such as proper nutrition (calcium, diet).

*September 13, 2009*

**history**

Struggling to answer completely and logically, please critique the below: Question: What were the similarities and differences between the five regions of British Colonial America and what factors worked to create a shared “American Identity” by the mid 18th century...

*September 9, 2009*

**5th grade Math**

i do not know

*September 4, 2009*

**History**

what were the similarities and differences between the five regions of British colonial America and what factors worked to create a shared American identity by the mid 18th century ?

*August 27, 2009*

**social studies**

what were the similarities and differences between the five regions of British colonial America and what factors worked to create a shared American identity by the mid 18th century

*August 27, 2009*

**HCA 230**

I guest I really don't understand this assignment. Compose a list identifying the major components of health communication. Who is involved in each component? How does each component promote health communication? If not utilized, how would it reduce health communication? ...

*August 24, 2009*

**HCA 230**

Thank You! C

*August 24, 2009*

**HCA 230**

I don't understand it. I guess my question is what do they mean by components.

*August 24, 2009*

**HCA 230**

Compose a list identifying the major components of health communication. Who is involved in each component? How does each component promote health communication? If not utilized, how would it reduce health communication? Provide examples.

*August 24, 2009*

**HCA 220**

What are the most important concepts you have learned in this course? How can you apply them to your life? What difference can the topic in this course make in your everyday life?

*August 16, 2009*

**SCI 275**

Urbanization, Describe environmental benefits and challenges of urbanization; describe two 1996 Dubai award winners

*July 18, 2009*

**History**

1. For the safety of the children and the continuity of the British civilization. 2.Some knew it was for the greater good, some thought it was to separate the family, some thought government played a major influence on a person private life.

*May 10, 2009*

**Genetics**

How could you use a reporter gene to see if a certain gene was an activator for an operon? Would you insert the reporter in front of the operon? Or with the activator gene?

*April 29, 2009*

**College Algebra/Inequalities**

solve the inequality x+3/x-2 less then or equal to 0

*March 20, 2009*

**Science**

I really don't understand this please can you give me an example? Am desperate!

*March 8, 2009*

**physics**

thanks for your help!!

*February 15, 2009*

**physics**

FYI - The symbols for ohms didn't work, that's what the U's with accents are.

*February 15, 2009*

**physics**

I'm confused as how to find the current for a circuit with both parallel and series resistors? R1 = 2 Ù R2 = 5 Ù R3 = 11 Ù R4 = 10 Ù V = 7 V R2 and R4 are parallel, then these are in series with R3, then this whole system is in parallel with R1...

*February 15, 2009*

**chemistry**

ii) What is the formula of 1, 3-butadiene

*February 13, 2009*

**history**

I need help with unscrambling these letters into 2 words ecnoevprmisrirtam.only hint it has to do with canada.

*January 30, 2009*

**us history**

its b

*January 17, 2009*

**artist**

WHICH ARTISTS HAVE BEEN IN THE ROMANTICISM MOVEMENT, AND PAINTED lANDSCAPES?

*November 30, 2008*

**com 140**

As a project manager, you are looking forward to completing your current project and then taking a European vacation with your bonus money. Shortly before bonuses are expected, however, you realize your team just missed reaching the financial goal for the quarter. As a result...

*August 29, 2008*

**algebra**

I am really stuck, can someone please help me with this? Multiply and simplify by factoring. Assume that all expressions under radcals represent nonnegative numbers. (type in radical form) ∛(y^13 ) ∛(16y^14 )

*July 14, 2008*

**algebra**

I have a computer progam that allows me to create the symbols.

*July 14, 2008*

**algebra**

Can someone please help me with this? Solve ∛(x+1) = 3

*July 14, 2008*

**algebra**

Do polymonials contain rational numbers as exponents?

*July 10, 2008*

**algebra**

Can someoe please help me figure this out? During the first part of a trip, a canoeist travels 63 miles at a certain speed. The canoeist travels 6 miles on the second part of the trip at a speed of 5 mph. slower. The total time for the trip is 5 hours. 1. What was the speed (...

*July 10, 2008*

**algebra**

Can someone show me how this would be simplifyed? 5^1/2 * 5^1/4

*July 10, 2008*

**algebra**

Is this a true statement? Polynomials and radical expressions differ because radical expressions contain rational numbers as exponents and polynomials do not.

*July 8, 2008*

**algebra**

Why is it important to simplify radical expressions before adding or subtracting?

*July 6, 2008*

**algebra**

How is adding radical exressions similar and different to adding polynomial expressions?

*July 6, 2008*

**algebra**

How would you explain how the laws of exponents work with rational exponents?

*July 6, 2008*

**algebra**

I think that the answer is 1173, please disregard:)

*July 4, 2008*

**algebra**

Cans omeone le me know if I arrived at the correct answer? To determine the number of deer in a game preserve, a conservationist catches 391 deer, tags them and lets them lose. Later 534 deer are caught; 178 of them are tagged. How many deer are in the preserve? I came up with...

*July 4, 2008*

**algebra**

I don't understand how to do this, can someone please help me? To determine the number of deer in a game preserve, a conservationist catches 391 deer, tags them and lets them lose. Later 534 deer are caught; 178 of them are tagged. How many total deer are in the preserve?

*July 4, 2008*

**algebra**

Find the LCM for u^3 + 6u^2 + 9u, u^2 - 6u I came up with u(u+3)(u-6) is this correct?

*July 3, 2008*

**algebra**

Can someone please help me, I'm stuck. Find all numbers for which the rational expression is undefined. 7/(3v+7)

*July 2, 2008*