Monday

July 25, 2016
Total # Posts: 629

**Mechanics of Materials**

A railroad is laid so that there is no stress in the rails at 20 degrees celcius. Calculate the stress in the rails at -6 degrees celcuis if all the contraction is prevented. Take E=206GPa and linear coefficient of expansion is 12 x 10^(-6) /deg celcius. If, however, there is ...
*March 6, 2010*

**3rd grade**

Why are people fearful & excited about Ellis Island?
*March 1, 2010*

**math**

The brightness of a light bulb varies inversely as the square of the distance from the source. If a light bulb has a brightness of 300 lumens at 2 ft, what will its brightness be at 10 ft?
*February 8, 2010*

**math**

The brightness of a light bulb varies inversely as the square of the distance from the source. If a light bulb has a brightness of 300 lumens at 2 ft, what will its brightness be at 10 ft?
*February 8, 2010*

**Science**

Photoperiod: a plants response to lenghths of daylight and darkness each dayy
*February 8, 2010*

**trig**

find all solutions of the equation tan(sq)x=1
*February 8, 2010*

**MLA english question**

My professor said "2) Be sure to footnote your writing when necessary. Of course you do not have to footnote general information, and the difference is not always to see! If you're in doubt, footnote a whole paragraph, or even one sentence. By the way, you may use ...
*February 8, 2010*

**Maths**

If z=(x^n) f(x/y), where f is an arbitrary function, show that: x(partial z/partial x) + y (partial z / partial y) = nz Can someone please show me how to work it out? Thanks!
*February 3, 2010*

**Maths**

If y is a function of x and z = e^z, show that: x (dy/dx) = (dy/dz) and (x^2) (d2y/dx2) = (d2y/dz2) - (dy/dz) I managed to work out the first part. But I don't know how to prove the second part. Can someone please show me how? Thanks!
*February 3, 2010*

**trig**

what is the exact value of 7pi for all trig func.?
*February 1, 2010*

**Materials - Chemistry**

Distinguish between the two main types of interstitial sites in metallic crystal lattices. Discuss the importance and potential uses of these sites. Can someone please tell me what are the two types? Thanks!
*January 30, 2010*

**Maths**

Find the value of theta: -810Cos(theta) + 135 + 2430 Sin(theta)Cos(theta) = 0 Can someone please show me how to simplify it to find the value of theta? Thanks!
*January 26, 2010*

**Electricity**

A 3-phase 50Hz, 8 pole induction motor has an effective stator to rotor turns ratio of 4:2, rotor resistance 0.2ohms and rotor standstill reactance 0.3ohms. Calculate the starting torque and maximum torque. At full load the slip is 0.08. Calculate the torque, mechanical output...
*January 21, 2010*

**Electricity**

RCL Circuits electricity!? A 50V, 50Hz supply is connected to a series circuit consisting of a resistance, a 20mH inductor and a capacitor. a) Find the value of the capacitance and the power dissipated in the circuit when: (i) The current has a magnitude of 25A and leads the ...
*January 21, 2010*

**spelling**

What is an analogy for the word fly that starts with the letters scr, spr, str and thr that has 4 letters?
*January 14, 2010*

**Maths: Partial Differentiation**

1) If x = rcos theta and y = r sin theta, show that partial r / partial x = cos theta and find partial theta / partial x. 2) If z = sin theta.sin phi.sin gamma, and z is calculated for the values theta = 30degrees, phi = 45 degrees and gamma = 60degrees, find approximately the...
*January 9, 2010*

**Maths**

Solve the differential equation: d2y/dx2 - 2 dy/dx + y = 3sinhx The answer should be: y(x) = e^x (Ax+ B) + ( 3^8 )(2[x^2][e^x] - [e^-x] ) Can someone please show me how to work it out?
*November 30, 2009*

**Computer Programming**

/* Develop a C program that will determine if a department store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available: a) account number b) Balance at the beginning of the month c) Total of all items charged by this ...
*November 22, 2009*

**Physics**

e) Adjust the amplitude control of the function generator until the signal has a 6V peak-to-peak swing. The resultant form will have the following mathematical equation: v = Vm sin2(pi)ft = 3sing2(pi)500t f) The sinusoidal signal 3sin2(pi)500t has an effective value determined...
*November 19, 2009*

**Biology**

I read it wrong, phew. Thank you!
*November 17, 2009*

**Biology**

Okay, I need help. "If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Llxll will be homozygous dominant? a) 1/2 b) 1/4 c) 1/3 d) none (no change of this offspring) The key says that it's d, but when I do the ...
*November 17, 2009*

**English**

Hi, I'm reading "A Room of One's Own" (Chapter 3) and being asked what this quote means: "Perhaps now it would be better to give up seeking for the truth, and (!) receiving on one's head an avalanche of opinion hot as lava, discoloured as dish-water...
*November 15, 2009*

**Biology I**

Hi! Hoping someone knows this/has some on hand. Without being combined with anything, what colour is Pb(C2H302)2 (lead acetate)? My lab partners and I forgot to note the original colour. Please help if you can. I googled it, but couldn't find an answer. Thanks!
*November 10, 2009*

**maths**

if f(x)=(x^2)(e^x) prove by induction that the nth derivative is (x^2 +2nx +n(n-1)(e^x) thanks
*November 8, 2009*

**maths**

if f(x)=(x^2)(e^x) prove by induction that the nth derivative is (x^2 +2nx +n(n-1)(e^x) thanks
*November 7, 2009*

**C Programming**

I don't know what happened but it worked now when I pasted the code that you used! Thanks a lot! You were really helpful :)
*November 6, 2009*

**C Programming**

It still won't work but thanks a lot!!
*November 6, 2009*

**C Programming**

Thanks! But even after I changed the ampersand, it still gives me an error. It says error C2065: integer1 undeclared identifier error C2065: integer2 undeclared identifier and refers to the lines where there is the scanf of both integers.
*November 6, 2009*

**C Programming**

I am trying to find the sum of two integers. I entered the following program into the Visual Studio and it is telling me that there are errors. Can someone tell me where they are please? #include <stdio.h> int main( void ) { int integer1; int integer2; int sum; printf( &...
*November 6, 2009*

**Physics 10th Grade**

That makes sense, but what kinda of formula would i then use to solve it? I;m only going off of powerpoints its kinda bad.
*November 5, 2009*

**Physics 10th Grade**

Hi im kinda confused still on Pulley systems and hoping someone can help me out. The two masses (m1 = 5.5kg and m2 = 3.0kg) in the Atwood's machine shown in The Figureare released from rest, with at a height of 0.89m above the floor. When m1 hits the ground its speed is 1....
*November 5, 2009*

**Maths**

What is the intergral of: 2x/[(x+1)^3] dx Can someone show me how to work to work it out please? Thanks!!
*November 4, 2009*

**Physics**

A 2-hp motor drives a sanding belt. If the efficiency of the motor is 87% and that of the sanding belt 75% due to slippage, what is the overall efficiency of the system? The answer has to be 65.25%. Can someone please help me to work it out?
*October 24, 2009*

**college history**

I am having a difficult time comparing, contrasting, and explaining historical institutionalism and rational choice institutionalism for a paper because I do not understand these two theories at all. PLEASE HELP!! (wikipedia cannot be used as a source of information in my paper)
*October 22, 2009*

**History**

Thanks. I'll try to work from that.
*October 22, 2009*

**History**

I am having a difficult time comparing, contrasting, and explaining historical institutionalism and rational choice institutionalism for a paper because I do not understand these two theories at all. PLEASE HELP!! (wikipedia cannot be used as a source of information in my paper)
*October 22, 2009*

**9th grade Spanish**

Write a letter to a new pen pal. Hola, Yo me llamo Claire y you tengo 14 anos. Yo tengo dos hermanas. Ellos tienen 16 y 11 anos. Ellos se llaman Erica y Amelia. Me gusta la pizza y el chocolate. No me gusta huevos. Que te gusta comer? Yo me gusta eschuchar el radio y dormir. ...
*October 22, 2009*

**technology for Spanish?**

No, it can't read Spanish... I will still have to listen letter for letter.
*October 22, 2009*

**technology for Spanish?**

ñ % é Yes!! Yes! Yes!!!! I've got it working! Thank you so much, I changed the keyboard and then did alt and it worked. I'll be really happy if the screen reader can read in Spanish, too!
*October 22, 2009*

**technology for Spanish?**

I tried doing alt with 164, etc. But with a screen reader, alt and then 1 has another function so i can't do an accent.
*October 22, 2009*

**technology for Spanish?**

Could you give me a link where I can try and download accent marks? I have tried going on some sites and I can't download accent marks.
*October 22, 2009*

**Spanish**

Does anyone know how to get a screen reader in Spanish? It's so frustrating reading every letter in every word.
*October 22, 2009*

**science**

Oops, I forgot.. The nucleus is the part of the cell that has the information to create a new organism.
*October 21, 2009*

**science**

Assignment says label the parts of a plant cell. I'm blind so I'm going to write the names and put their functions. Cell wall, strenghthens the cell. vacuole is where the cell sap is produced. cell membrane is on outside on the cell. It controls what goes in and out of...
*October 21, 2009*

**math**

How do I solve absolute value bar 5p plus 12 absolute value bar equals 7?
*October 21, 2009*

**Engineering**

The boat is to be pulled onto the shore using two ropes. If the resultant force is to be 400N, directed along the keel, determine the magnitudes of forces T and P acting in each rope and the angle theta of P so that the magnitude of P is a minimum. T acts at 30 degrees from ...
*October 13, 2009*

**math, blind student**

What is a scatter plot? My math book is on tape and I have no idea what I'm supposed to do.
*October 13, 2009*

**Chemistry**

STEP 1 equation: CH4 + Cl2 --> CH3Cl + HCl STEP 2 moles of CH4: CH4 = 12.01 g + (1.008 g x 4) = 16.042 g/mol 20.5 g CH4 x (1 mol CH4 / 16.042 g CH4) = 1.28 mol CH4 STEP 3 moles of Cl2: Cl2 = (35.45 g x 2) = 70.9 g g/mol 45.0 g Cl2 x (1 mol Cl2 / 70.9 g Cl2) = 0.63 mol Cl2 ...
*September 29, 2009*

**Econ**

What would you pay today for a twenty year, 8% semiannual coupon bond with a face amount of $10,000 if you desired a 10% annual return (coumpounded semiannually)?
*September 20, 2009*

**Physics**

A 20.0 kg box rests on a table. what is the weight of the box and the normal force acting on it? A 10.0 kg box is set on top of the 20.0kg box. Determine the normal force that the table exerts on the 20.0kg box and the normal force that the 20.0kg box exerts on the 10.0kg box.
*September 3, 2009*

**4th Grade Language Arts**

Can you please check my answers. I made the answers in capital letters. Directions, Choose the simple subject in each sentence. 1. The annual kite contest takes place this weekend. KITE 2. Fifty contestants are competing for first prize this year. CONTESTANT 3. The rules ...
*September 2, 2009*

**9th grade**

subtract 2 from each side which cancels the 2 and makes 4 instead of 6 then divide by 6 canceling the original 6 and dividing 4 by six. four divided by six is .6666 or in other words 2/3
*September 1, 2009*

**4th grade Language Arts**

I don't think you are understanding the questions. Because I'm not looking for the verb on the first 5 sentences and your missing number 10...I think the numbers you gave me are off for the answers.
*August 28, 2009*

**4th grade Language Arts**

Find the complete subject. I put the complete subject in ( ). 1. (Ramon travels) to many countries for his job. 2. (My mother) will meet him at the airport. 3. (He sometimes) stays at our home. 4. (Ramon bought) us presents from Holland last year. 5. (My family enjoys hearing...
*August 28, 2009*

**9th Algebra**

7/20
*August 25, 2009*

**chemistry**

Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. MnO4– + H+ + Fe2+ Mn2+ + H2O + Fe3+
*June 29, 2009*

**Simplifying Rational Expressions**

1) d + 7/d^2 - 49 2)b^2 - 10b + 21/b^2 - 11b + 28 Please help me.
*June 3, 2009*

**Math**

5 bags?
*June 1, 2009*

**Math**

Bob wants to start a lawn in an area that is 110ft by 70ft. One bag of seed covers 1200 square feet. How many bags should he buy? Please help me solve
*June 1, 2009*

**Maths**

4ab-8ac+12ad
*May 26, 2009*

**Grammar**

Thank you. I have all the websites you listed in my favorites file so I can check them after school today. Thanks so much.
*May 5, 2009*

**Grammar**

I think blue does have a long vowel sound. Like the words use and uniform. I will check out the websites after school today. Are you sure Blue is vowel digraph?
*May 5, 2009*

**Grammar**

Can you please check these? Thanks. Vowel Pairs: freezing rain sleet beat gray streets blue play Kay raisin feel easy Vowel Digraphs: looked said caught headline said school because heavy weather good sleigh said could neighbor bread instead
*May 5, 2009*

**3rd grade phonics**

Thanks for the link. Are the ones I picked correct? Thanks.
*May 4, 2009*

**3rd grade phonics**

Can you please check these? Thanks. Vowel Pairs: freezing rain sleet beat gray streets blue play Kay raisin feel easy Vowel Digraphs: looked said caught headline said school because heavy weather good sleigh said could neighbor bread instead
*May 4, 2009*

**3rd grade grammar**

Identify the helping verb, linking verb and subject pronouns in each sentence. 16. The mother cat has curled into a ball. HV-has LV- SPN- 17. Kate's kitten has disappeared. HV-has LV- SPN- 18. It is not with the other kittens. HV-is LV- SPN-It 19. I have looked under Dad&#...
*May 4, 2009*

**3rd grade Math**

Thanks, no problem.
*April 28, 2009*

**3rd grade Math**

I think I'm right but not sure if the second part of your answer is right? But I think mine is.
*April 28, 2009*

**3rd grade Math**

Question: Sandy, has fewer than 16 crayons. If she puts them in equal rows of 5, none are left over. If she puts them in equal rows of 6, four are left over. How many crayons are there? two rows of fives=10 one row of sixes=6 10-6=4 crayons left over. I think the answer is 10 ...
*April 28, 2009*

**3rd Grade Grammar**

Thank you.
*April 27, 2009*

**3rd Grade Grammar**

Can you please tell me if these are correct. Directions..replace capitol words with a pronoun. 1.THE RAIN poured down. IT 2.RAINDROPS beat against the window. THEY 3. Greta asked DAD about the storm. HIM 4. Dad told GRETA AND ME about thunder. US 5. Then GRETA AND I saw a ...
*April 27, 2009*

**Math**

6s^2+11s-21/s divided by s^2+11s+24/st Help walk me through this, please? I keep getting it wrong.
*April 27, 2009*

**3rd Grade Grammar**

Thank you so much :-}
*April 27, 2009*

**3rd Grade Grammar**

I need help. I think the book is trying to trick me. Directions: Select the Subject Pronouns and Object Pronouns in each sentence. 3. They filled the sky. S-they O-none? 5. Greta saw it first. S-none? O-it 6. Dad asked us to come inside. S-none? O-us 7. I wanted to stay ...
*April 27, 2009*

**Accounts (URGENT)**

If in the asserts-liability statement the value of the closing stock is $1580 and then there is an additional note which says: Stock valued at $4240 had been discarded during the year as it had deteriorated and could not be sold How will I account for it? Can someone help me ...
*April 27, 2009*

**biology please help**

Explain how the small intestine is specialized for digestion and absorption. the small intestine is specialized for absorption by the huge number of villi that line the intestinal wall. BUT HOW is it specialized for digestion
*April 26, 2009*

**Physics**

drwls, i think your way of solving the problem is incorrect. my online homework rejected your answers. From your equations I concluded: Vx=33.5 m/s, Vy=0 V=(Vx^2+Vy^2)^(1/2) = 33.5 m/s X=v*(2h/g)^(1/2) = (2*1.4/9.81)^(1/2) = 17.9 m Unfortunately, these answers are wrong.
*April 12, 2009*

**Physics**

When William Tell shot the apple off his son's head, the arrow remained stuck in the apple, which means the collision between the arrow and apple was totally inelastic. Suppose that the velocity of the arrow was horizontal at 75 m/s before it hit, the mass of the arrow was...
*April 12, 2009*

**math**

4 numbers are drawn at random from 10 tiles numbered 0-9. what are the odds of drawing numbers 1-4 in any order. the question is confusing me
*April 9, 2009*

**algebra**

x^6-64 How do I factor this problem? The answer I'm supposed to get, I can't figure out how to get there.
*April 7, 2009*

**math help**

can someone explain to me how i should factor this problem? x^6-64 How do I know if i'm supposed to use the difference of two squares, or the difference of cubes?
*April 6, 2009*

**chem**

and DrBob222 is why you should never trust the internet
*March 20, 2009*

**3rd grade Grammar**

5. Hikers?
*March 3, 2009*

**3rd grade Grammar**

I can't figure out if the teacher is trying to trick me. I'm supposed to find the plural subject in the following sentences. I can't find a plural subject. Can you help me. 1. Yellowstone National Park is in Wyoming. (can't figure this out) 2. This park also ...
*March 3, 2009*

**Calculus**

Can you please explain how to work it because I still cannot understand.
*February 22, 2009*

**Calculus**

Find the intergral of 1/[cos(^2) x
*February 22, 2009*

**History**

Thank you. On the website it says: "The term is often used to refer to various economic philosophies and political philosophies which seek to minimize or eliminate government intervention in most or all aspects of society." does this mean that the original statement ...
*February 20, 2009*

**History**

"Although the economic growth of the United States between 1860 and 1900 has been attributed to a governmental policy of laissez-faire, it was in fact encouraged and sustained by direct government intervention." Assess the validity of this statement. Is there any ...
*February 20, 2009*

**chem**

car companies making airbags
*February 10, 2009*

**Biology**

Orange color in non-pedigreed cats is controlled by the O locus. The non-orange phenotype, if not diluted, appears as black coat color. Perform the following reciprocal crosses: Orange blotched female X black blotched male Black blotched female X orange blotched male What ...
*February 10, 2009*

**Maths - Vectors**

The position vectors a,b,c of the points A,B,C relative to the origin O are ai, bj and ck respectively.Find: 1) a vector equation for the line l throught O which is normal to the plane ABC. 2) a vector equation of the plane ABC The answers should be: 1) r=t(bc i +ac j +ab k) ...
*February 2, 2009*

**input output table**

input output 5 7 15 44 0 1 2 3
*January 15, 2009*

**Accounts**

A company produces just one standard product. The company's budgeted overheads for the next financial year are £80000. Other relevant information includes: Budgeted Production: 16000 units Cost of Raw Material per unit: £4 Cost of Direct Labour per unit: £...
*January 8, 2009*

**Biology**

A bricklayer has an assistant who brings bricks to the bricklayer so she can build a wall. What part of translation most closely resembles the assistant's job? What do the bricks represent?
*December 8, 2008*

**Genetics/Biology**

What kind of inheritance is it when the offspring have spots of different colors from its parents? Like a brown dog with a white dog makes a white/brown spotted dog.
*December 7, 2008*

**Physics**

I am finding the value of the time constant in a circuit from the graph and by the CR equation. When using the graph I am getting t= 50s and when using the equation t=CR the answer is 2.09. Can someone help me please?
*November 26, 2008*

**3rd grade 1st year spanish**

I am so confused. This is my first year of spanish and I only have it 1 day a week. Our books are really small without any translated information. I need 2 words that start with the following letters in spanish with the english translation. Thanks for your help. 2 words Y- K- ...
*November 16, 2008*

**3rd grade**

Thank you. I was thinking that each game scored 12 goals. Not 12 goals total. Now that makes sense.
*November 13, 2008*

**3rd grade**

Thea's soccer team scored 12 goals in the first three games. The team scored the same number of goals in wach of the first two games. The team scored 3 fewer goals in the third game than in the second. How many goals were scored in each game?
*November 13, 2008*

**math**

it would be -1/70-7 which is -1/63 do the reciprocal it's 63/-1 or it's the same thing as -63
*November 6, 2008*