Friday

January 30, 2015

January 30, 2015

Total # Posts: 94

**physics**

A tank of compressed helium for inflating balloons is advertised as containing helium at a pressure of 2374 psi, which, when allowed to expand at atmospheric pressure, will occupy a volume of 194 ft3. Assuming no temperature change takes place during the expansion, what is the...
*November 25, 2014*

**2 Math Questions**

Sorry about the long name
*November 6, 2014*

**Finance**

Honey well international zero coupon bonds par value $1000 mature on April 21, 2012. Calculate the yield to maturity if an investor purchased one of these bonds on April 21, 2006, at a price of $650.
*October 31, 2014*

**Thermodynamics**

-180 69 C 563.5 550 550 b)
*October 17, 2014*

**Map Rectangle**

The scale of the map is 1:1000. What are the actual dimensions of a rectangle which appears as 4cm by 3cm on the map? What is the area on the map in cm2. What is the actual area in m2.
*October 16, 2014*

**Map to sacle**

The 17th hole at the famous St Andrews golf course is 420m in length. how long will it appear on a plan of course of scale 1:8000?
*October 15, 2014*

**math**

The 17th hole at the famous St Andrews golf course is 420m in length. how long will it appear on a plan of course of scale 1:8000?
*October 15, 2014*

**Astronomy**

1. 10^12 2. 30
*June 19, 2014*

**physic**

A cylindrical conductor of length l and uniform area of cross-section A has resistance R. What is area of cross section of Another conductor of the same material of length 2l and resistance R ?
*May 16, 2014*

**Maths Probability**

Ans for 3, 5 and 6? Anyone?
*May 15, 2014*

**Maths Probability**

3. 1.5 is incorrect :(
*May 15, 2014*

**Astronomy**

2.089*10^28
*April 25, 2014*

**Probability**

Let Zi=13Xi+23Xi+1 for i=1,2,…, and let Mn=1n∑i=1nZi for n=1,2,…. What value does the sequence Mn converge to in probability? Ans: 2
*April 23, 2014*

**Math**

When fX(x) = {2e−2x,if x>0, 0, otherwise, we have fY(y) = {g(y),if a<y, 0, otherwise. Give a formula for g(y) and the value of a using the standard notation. g(y)= a=
*March 18, 2014*

**Math**

When fX(x) = {1/3, if −2<x≤1, 0, otherwise, we have fY(y) = {g(y),if a<y≤b, 0,otherwise. Give a formula for g(y) and the values of a and b using standard notation. (In your answers, you may use the symbol 'e' to denote the base of the natural ...
*March 18, 2014*

**Math**

P(X>0.75)= 0.2266 P(X≤−1.25)= 0.1056 Can't figure out these: E[Z]= var(Z)= P(−1≤Y≤2)= anyone?
*March 16, 2014*

**Math**

Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. P(X>0.75)= P(X≤−1.25)= Let Z=(Y−3)/4...
*March 16, 2014*

**Probability**

Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. P(X>0.75)= P(X≤−1.25)= Let Z=(Y−3)/4...
*March 16, 2014*

**probability**

anyone know the answers to this?
*March 11, 2014*

**Probability**

has anyone figured out the answer for (c)??
*March 7, 2014*

**chemistry**

use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.20 M NaHCO3 and 0.10M Na2CO3.(Ka=5.6x10^-11). how would you prepare NaHCO3-Na2CO3 buffer solution that has the pH of 10.40.
*February 28, 2014*

**Calculus**

¡ìdx/(x^2-1)^2
*February 21, 2014*

**Calculus**

¡ì(up:1 down:0) (x^3 dx)/(x^2+2x+1)
*February 21, 2014*

**Calculus**

y"-y'=sin x solve in undetermined coefficients
*February 21, 2014*

**probability**

Before leaving for work, Victor checks the weather report in order to decide whether to carry an umbrella. The forecast is “rain" with probability 20% and “no rain" with probability 80%. If the forecast is “rain", the probability of actually ...
*February 12, 2014*

**probability**

P(A) = 4/9 P(C) = 0 P(D) = 3/4 Anyone know the solution for the below?: P(B) P(A∩B) P(A∩D)
*February 7, 2014*

**probability**

P(D) = 0.75
*February 7, 2014*

**Physics Classical Mechanics Help ASAP**

fred for temp of 5 degrees celsius b) 55465.76 c) 24 percent
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

c) 24 percent
*January 10, 2014*

**chemistry**

Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1085 K. Assume the pre-exponential factor is one. unanswered
*November 17, 2013*

**chemistry**

A p-n junction is obtained at a depth of 3 x 10-3 cm below the surface by diffusion of antimony (Sb) into p-type germanium. What is the donor concentration in the bulk germanium if the diffusion is carried out for three hours at 790 C? Express your answer in number of donor ...
*November 17, 2013*

**chemistry**

The Young's modulus for a material is 15.0 x 10^10 N/m2. The material is stretched to a strain of 6.0 x 10^-3. How much elastic energy will be expended? (Express your answer in J/m3)
*November 17, 2013*

**chemistry**

The Young's modulus for a material is 15.0 x 1010 N/m2. The material is stretched to a strain of 6.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3)
*November 17, 2013*

**chemistry**

Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1284 K. Assume the pre-exponential factor is one. unanswered
*November 17, 2013*

**Physics Classical Mechanics**

have you got answer of any one of your questions????? :p
*November 14, 2013*

**Quantum Physics**

what about others, please help rs and others..........
*October 12, 2013*

**Quantum Physics**

Q7 and 8 please
*October 12, 2013*

**Math**

Five weeks is how many seventy-thirds of a year
*July 14, 2013*

**math calculus (please help me)**

The marginal cost of a product is modeled by dC/dx= 16/cube root 16x + 3 where x is the number of units. When x = 17, C = 120. (a) Find the cost function. (Round your constant term to two decimal places.) c= (b) Find the cost of producing 90 units. (Round your answer to two ...
*May 28, 2013*

**math 160(buss calculus)**

The demand function for a product is given by p = 10,000 [1 − (5/5 + e^−0.001x)] where p is the price per unit (in dollars) and x is the number of units sold. Find the numbers of units sold for prices of p = $1000 and p = $1500. (Round your answers to the nearest ...
*May 11, 2013*

**physics**

its wrong!!!! tell the correct answer
*April 30, 2013*

**physics**

you son of bitc h go in your mother`s slit!!!!!11
*April 30, 2013*

**physics**

its wrong,,,,,,, tell the correct answer
*April 30, 2013*

**Maths**

thanxxxx
*April 29, 2013*

**Quantum Physics**

@abc did you got question 8D?
*April 16, 2013*

**Quantum Physics**

Anonymous, did you get all solutions for Q 7 and 8 except 8(D). If yes then please share......
*April 16, 2013*

**physical**

An electric field with a magnitude of 3.50 kN/C is applied along the x axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.7 m long assuming that (a) the plane is parallel to the yz plane; (b) the plane is parallel to the xy plane; (c) the plane ...
*March 20, 2013*

**physics**

A particle starts moving with acceleration 2 m/s2. distance travelled by it in 5th half second is..??
*March 19, 2013*

**lab**

How much 38%Hcl will be used to prepare N/3.05 solution in 2litre water.
*January 18, 2013*

**Biology**

bacteria
*January 7, 2013*

**Algebra- Check Please**

that isn't the answer, use substitution replacing y to the left of the equation 9/7x=-3x+12 solve this for x. then multiply the x you find by 9/7 to get the y
*January 7, 2013*

**Math**

x=green marbles y=blue marbles x+y=57 x+13=y b/c there are 13 more blue marbles substitute in to other equation x+(x+13)=57 then solve for x, then for y add 13 to x
*January 7, 2013*

**math**

you take the prize of the bag and divide that by the number of ounces, the lower of the outcomes gives you your answer
*January 7, 2013*

**math**

to AVG at least a 60 his total test scores must add up to 420 b/c 420/7=60. therefore you can add his current test scores and then subtract that number from 420 to find the minimum he can receive on the 7th test
*January 7, 2013*

**Physics**

On a frictionless table, a 3kg block moving 4m/s to the right collides with an 8kg block moving 1.5m/s to the left. If the blocks stick together, what is the final velocity? How much mechanical energy is dissipate in the collision?
*January 1, 2013*

**discrete structure**

Assume that Adam has 4 books to be bought. For each book, Adam can buy it from 3 different shops. Further assume each shop is unique. Using graph/tree graph,show the possible ways to buy all books starting from book 1 to book 4 in sequence.
*December 13, 2012*

**linear programming math**

A man owns two building supply stores, one on the east side and one on the west side of the city. Two customers order some 1/2 inch plywood. Customer A needs 50 sheets and customer B needs 70 sheets. The east side store has 80 sheets and the west side store has 45 sheets of ...
*December 7, 2012*

**AP WORLD HISTORY**

Increased the use of slavery: using it as a payment for slaves. Violence: people got drunk and violent
*August 2, 2012*

**PHY**

Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. 1360 m/s correct answer. (b) If an ...
*July 5, 2012*

**Science**

1. b 2. a 3. d 4. d
*April 11, 2012*

**statistics**

in 1000 tosses of a coin, 560 heads & 440 tails appear. is it reasonable to assume that coin is fair.
*February 22, 2012*

**PHYSICS**

A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP
*December 18, 2011*

**PHYSICS**

A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP
*December 18, 2011*

**Finance**

help the marketing manager decide which product promotion to implement
*November 25, 2011*

**Finance**

help the marketing manager decide which product promotion to implement
*November 25, 2011*

**Corporate Finance**

) A typical use of managerial accounting is to: help the marketing manager decide which product promotion to implement
*November 25, 2011*

**spanish**

please unscramble this spanish word: REGTARLNIA
*September 8, 2011*

**chemistry**

d = m/v = 16.3/85.2 = 0.191
*August 29, 2011*

**math**

If 2^x=3^y=12^z then show that 1/z = 1/y + 2/x
*August 29, 2011*

**geometry**

In the figure shown, NK and ML are parallel, JN=10 feet, NK=14 feet, JL=22 feet, and ML=24. Find KL.
*February 3, 2011*

**algerba..plz help**

A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
*December 7, 2010*

**math**

Yup!
*November 5, 2010*

**math**

You just do 1/8 to find the percentage.
*November 5, 2010*

**Grammar**

Do your parents come from El Salvador?
*November 4, 2010*

**geometry**

a=46c
*September 12, 2010*

**cpu**

lim x infnitive (4x-1/2x+9)
*July 1, 2010*

**math**

lim x infinitive (4x-1/2x+9)
*June 30, 2010*

**Math**

lim x infnitive (4x-1/2x+9)
*May 26, 2010*

**chemistry**

Write a net equation for the reaction between aqueous solutions of HClO4 and NaH2PO4.
*April 26, 2010*

**Electronic Timing inc**

abc
*March 30, 2010*

**Chemistry- Solubility Curves**

who cares
*March 10, 2010*

**6th grade**

your introduction is important because this is where the reader decides if your story is boring or not. firstly you should have some sort of grabber to get the readers attention then you should go on to state your three reasons and try to make each a sentence. lastly you ...
*March 8, 2010*

**9th grade**

what citrus fruit will power a LED light bulb for the longest period of time.
*March 3, 2010*

**Finance**

20. TexMex Products is considering a new salsa whose data are shown below. The equipment that would be used would be depreciated by the straight-line method over its 3-year life, would have zero salvage value, and no new working capital would be required. Revenues and other ...
*March 1, 2010*

**Statistics**

Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective .(you may take the distribution to be Poisson; e-4= 0.0183).
*October 6, 2009*

**economics**

Different market structures are prevailing in our different sectors like agriculture, power supply, transport industry, cement industry, restaurants, etc. Analyze and compare the characteristics of all market structure with respect to the given sectors.
*January 1, 2009*

**world history**

What are the legends about qutb minar?
*August 9, 2008*

**social studies**

what were politicians who supported a moderate tariff and federal help for the state called
*January 12, 2008*

**poetry essay**

I'm having problems coming up with a thesis statement for Edgar Allen Poe's poem The Raven. I have to do an analysis paper. Any suggestions on where to begin?
*October 19, 2007*

**Lord of the Flies- English**

What is the significance of Piggy's plea to join the expedition? -Thanks I have never read this book -- and don't plan to! But you can check at these sites for some ideas. www.sparknotes.com/lit www.pinkmonkey.com www.enotes.com www.gradesaver.com/classicnotes/titles ...
*July 29, 2007*

**History**

who was the Chinese philosopher that taught the importance of good moral character and take responsibility for their society? Confucius
*May 31, 2007*

**English**

I have to write a poetry analysis paper. I do not know how to start the first paragraph. Do I startwith telling the teacher what I'm writing on and then go into the different parts or should i take another approach? I'll give you some of the best links I've found. ...
*April 20, 2007*

**math**

Find the second derivative. y = sqrt(3x+4) I will be happy to critique your work. We don't do it for you. Thanks. Please post under one name. Thanks. who are u?
*February 20, 2007*

**math**

A widget factory has fixed costs of 35 billion dollars and variable costs of 781 million dollars per widget. The revenue (in $ billions) from selling x number of widgets is given by the following for x between 0 and 60. R(x) = 0.11 (60x - x2) What is the marginal profit (in $ ...
*February 19, 2007*

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