Monday

July 28, 2014

July 28, 2014

Total # Posts: 1,060

**science**

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 8.67? The acid dissociation constant values for piperazine are Ka1 = 4.65×10–6 and Ka2 = 1.86×10–10.

**Math Calculator Question**

How would I plug the following formula in a TI-30X calculator: P(5)= (10 C 5)(0.20^5)[0.80^(10-5)] When I try to do it, I get 0.000104858, but that is not the correct answer.

**science **

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.079 M NaOH. Next, you add 1.00 mL of 7.15 × 10-6 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form LH

**Physics**

If a car is going .197 meters per second, how long will it take to go 5 kilometers (assuming the ground is perfectly flat).

**Statistics**

A manufacturer ship toasters in cartons of 10. In each carton, they estimate a 20% chance that one of the toasters will need to be sent back for minor repairs. What is the probability, that in one carton there will be 5 toasters that need repair? I have no idea on where to beg...

**Statistics**

A small software company bids on two contracts. It anticipates a profit of $60,000 if it gets the larger contract and $25,000 if it gets the smaller contract. The company estimates that there is a 32% chance it will get the larger contract and a 62% chance it will get the smal...

**Statistics**

The soccer team's shirts have arrived in a big box and people start grabbing them. The box contains 7 medium, 12 Large, and 11 extra-large shirts. What is the probability that the first 4 shirts are all extra large? I have been struggling with the problem for an hour and c...

**English/ Writing**

from what my notes say - this is going to be an attempt to create integration through the use of a new term/ concept that either combines disciples or some aspect of the disciplines.

**English/ Writing**

What are some bad compound concepts and what makes them bad?

**8th Grade Math**

25/50 x 60/70 x 100/200= 72 6/7

**Math**

Write remainder as a fraction in simplest form: 567/15=

**Math**

Find the value of k so that the line containing the points (k,−8) and (−3,−5) is parallel to the line containing the points (9,7) and (12,5).

**math**

The low temperature on friday was five degrees below zero celsius. On saturday the low temperature was eight degrees below zero celsius. What integer best represents the low temperature on saturday in degrees celsius?

**C++**

Write a complete, working program that will do the following: Suppose you want to write a program to calculate the total cost of an item that has sales tax added. If a given item costs 14.97, and the tax rate is 6.7%, display the following information: a) The original cost of ...

**Math**

What is the shape of the power function that controls the end-behavior?

**English**

Need help with this assignment. Please and thanks. The first composition should be about making a decision. Since this will be a narrative piece of writing, chronological order will probably work best. The second composition will be about the American way of life. In it, descr...

**Math (please help Steve)**

A crippled rook can move on a chessboard in the following way: from a square, it can move to an adjacent square sharing a common side, and every two consecutive moves must be at right angles (i.e., the rook makes a 90∘ turn at every move). A cycle is a sequence of square...

**maths**

a roofer charges $25 per hour for himself and $15 per hour for his assistant. On a recent job the assistant worked 2 hours less than the roofer and the tot charge for labour was $290. Let r be the number of hours that the roofer worked. Which of the following equation can be u...

**maths**

1)a linear function is represented by f(x)=2x+7 which of the following functions would be parallel to that of the function above a)f(x)=2x-7 b)f(x)=x+7 c)f(x)=x-7 d)f(x)=-1/2x+7 e)f(x)=-1/2x-7 I choose b 2)water is pumped into an empty tank at a constant rate. after 2 minutes ...

**Math (please help steve)**

Circles Γ1 and Γ2 have centers X and Y respectively. They intersect at points A and B, such that angle XAY is obtuse. The line AX intersects Γ2 again at P, and the line AY intersects Γ1 again at Q. Lines PQ and XY intersect at G, such that Q lies on line se...

**Math (please help steve)**

A crippled rook can move on a chessboard in the following way: from a square, it can move to an adjacent square sharing a common side, and every two consecutive moves must be at right angles (i.e., the rook makes a 90∘turn at every move). A cycle is a sequence of squares...

**math (please help steve)**

A crippled rook can move on a chessboard in the following way: from a square, it can move to an adjacent square sharing a common side, and every two consecutive moves must be at right angles (i.e., the rook makes a 90∘turn at every move). A cycle is a sequence of squares...

**math (please help steve)**

Circles Γ1 and Γ2 have centers X and Y respectively. They intersect at points A and B, such that angle XAY is obtuse. The line AX intersects Γ2 again at P, and the line AY intersects Γ1 again at Q. Lines PQ and XY intersect at G, such that Q lies on line se...

**physics**

a feather is dropped on the moon from a height of 1.4 meters.the acceleration of the moon is 1.67 m/s determine the time for the feather to fall on the surface of the moon

**physics**

a feather is dropped on the moon from a height of 1.4 meters.the acceleration of the moon is 1.67 m/s determine the time for the feather to fall on the surface of the moon

**math word problem**

sam needs to clean the window on his house. he has a 25-foot ladder and places the base of the ladder 10 feet from the wall of the house. A) how high up the wall will the ladder reach? B) if his windows are 20 feet above the ground, what is the farthest distance the baes of th...

**MAT LAB**

9_1_1 4 &0.4 9_2_1 99.42,99.98,100.54 9_3_1 don't know...

**Physics**

9_1_1 4 &0.4 9_2_1 99.42,99.98,100.54 9_3_1 don't know...

**Material Sciences**

9_1_1 4 &0.4 9_2_1 99.42,99.98,100.54 9_3_1 don't know...

**writing**

1)Al:(who's,whose)car is in my parking space? 2)Ben:(it's,its)Fred's. 3)Al:(know,no,his car is red.It might be the Jones'. 4)Ben:(their,there,they're)car is green.(here,hear)come Bob and Tony. 5)Tony:Hi!Isn't my (knew,new)car(grate,great)? 6)Al:(you'...

**Writing**

thank you

**Writing**

On the whole, peoples experiences with department store cards are good except when they loose a card. Can you tell me if i used except and peoples corectly

**Math**

The Chicago Art Museum's Renaissance display consists of four hallways bordered around a square courtyard. A single guard is assigned to patrol the four hallways. When the guard starts working, he begins in one of the corners and walks clockwise. When he arrives at a subse...

**Physics**

A thin aluminum ring hangs vertically from a torsion spring. A torsion spring when twisted exerts a restoring torque given by τ=−κθ where θ is the angle of twist. Suppose that the ring undergoes small torsional oscillations while it is being cooled do...

**Math-algebra-Steve**

The sequence {an} satisfies a0=1,a1=213, and an=2an−1+an−2 for all n≥2. Let S=∑i=1 to infinity a[i-1]/(a[i]^2-a[i-1]^2) What is the value of 1/S?

**math**

16

**geometry**

101

**Physics**

0.700

**Math**

The sequence {an} satisfies a0=1,a1=213, and an=2an−1+an−2 for all n≥2. Let S=∑i=1 to infinity a[i-1]/(a[i]^2-a[i-1]^2) What is the value of 1/S

**Physics**

A small coin is inside a bowl. The bowl is a surface of revolution of the curve y=100x^4 m^-3. This coin slides around the inside of the bowl at a constant height of y=0.01 m above the bottom of the bowl. What is its angular velocity in rad/s? Accel due to gravity = 9.8 m/s^2

**Math**

61

**Calculus 2**

(x^3+2x^2-15x+1)/(x^2+2x-15) from 0 to 7

**chemistry**

1.what are amber light from traffic signal? 2. what are cosmic rays from outer space?

**history**

Lord Selkirk 1804 during his tracels in British North America

**history**

Lord Selkirk implied that the French 1)were happy under English rule 2)never accepted English rule 3)should accept English rule 4)should change their language and institutions 5)were not oppressed by the English i put 4

**history**

William Lyon Mackenzie 1837 in a published handbill

**history**

it can be inferred that William Lyon Mackenzie 1)was a famous writer 2)was a member of the Family Compact 3)oppose the oligarchies 4)supported the British 5)believed in peaceful assembly I put 1

**Precalc Math**

Suppose you want to end up with $5,000 in a bank account after 4 years earning a rate of 3.5% compounding monthly. How much would you have to initially invest? Round to the nearest dollar. Thanks a lot in advance!! :)

**math**

4x^2+24x+128y-988=0 in standard form

**Chemistry**

Oxygen gas and hydrogen gas are used to synthesize dihydrogen monoxide. A lab group utilizes 1.00 liters of oxygen and 1.01 liters of hydrogen to create 0.75 grams of product. How many milliliters of product should the group have expected to get? What will the [H+] concentrati...

**enlish literture**

narnia the lion the the witch and the wabode two literary devives were used in chapter 10 repetition and smiple identify the line that features these device

**spanish 1**

gaston subio a los autitos chocadores pero primero teníamos almuerzo y caminó allí

**physics**

A helium balloon has a mass of 0.022 kg, which includes both the helium and the balloon itself. On this balloon, there is 0.290 N of buoyant force pushing the balloon upward. If I let go of the balloon, find the balloon's acceleration rate in the upward direction. If we ne...

**physics**

Honors Physics

**geometry**

M is the midpoint of JK, Q is the midpoint of MK, and X is the midpoint of MQ. if a point on JK is picked at random, what is the probability that the point is on MX?

**Biology**

You have stated that you have love for this like of thing, high school Biology isn't that when you try it out, just have to do the following. Study, study, study and the rest you'll really enjoy

**English**

These are right Thanks soO MUCH!!!!

**Statistics**

The yearly returns of a stock are normally distributed with a mean of 5.1% and standard deviation of 2.7%. Find the probability of a yearly return being greater than 6%.

**math**

What is the surface area of a circle that has a diameter of 14 inches?

**Biology**

even in multicell organisms (ex: animals) events which occur in individual cell may have profound effects on their entire organism.

**Chemisty**

Before solving the problem write a balanced chemical equation Excess aqueous NaI was added to 50 mL of aqueous CuNO3 solution, and 14.2 g of CuI precipitate was formed. What was the molar concentration of CuNO3 in the original solution? Answer in units of M

**physics**

If your browser can't load certain text, the box after angle is theta, and the coefficient of static friction is u sub s

**physics**

Your written homework will be graded entirely on the clarity and completeness of your derivation. No credit will be awarded for a final answer without a derivation. As usual, simplify your final answers as much as possible. A giant Pez dispenser of mass m rests on a ladder of ...

**Geometry**

2x^2-9x-5=0 Is it possible to combine 2x squared with 9x? Not sure how to tackle solving this one.

**art**

From Wiki Answers: If you are a fan of someone famous, you may want to do what they want to do. Testimonial propaganda is a type of propaganda that is used when someone famous says something good about a certain issue, product, etc. I have not heard of icon ads.

**Physics**

Particles 1 and 2 have charge 20uC each and are held at separation distance d=1.50m. (a)What is the magnitude of the electrostatic force on particle 1 due to particle 2? Particle 3 of charge 20uC is positioned so as to complete an equilateral triangle. (b) What is the magnitud...

**Math**

A recipe for fruit punch calls for 2 1/2 c of orange juice, 1 1/3 c of pineapple juice, and 1 3/4 c of soda water. If June makes 4 times the recipe, how many cups of fruit punch will she have?

**Chemistry**

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

**Chemistry**

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

**Chemistry**

Calculate the pH of a buffer solution containing 1.0 M ammonia (NH3 ; Kb = 1.8 x 10-5) and 1.0 M ammonium chloride (NH4Cl).

**Chem**

What is the maximum Cu2+ concentration possible in a solution that has a 7.4 E -5 M sulfide ion concentration without precipating CuS? For CuS, Ksp= 6.0 E -36

**Statistics**

A coin is tossed 10 times. What is the probability that the third head will apear on the tenth toss?

**algebra**

From a point on a straight road, John and Fred ride bicycles in opposite directions. John rides 10 miles per hour and Fred rides 12 miles per hour. In how many hours will they be 55 miles apart?

**Science**

What happens to make ice change into liquid and why does liquid water become a gas?

**Physics**

how far from the center of the earth would a person with a weight of 469N on earth have to be to have a weight off 55.4N?

**accounting**

Acme Corporation issued $650,000, 8%, bonds for $720,000. Was the market rate on the date of issue higher than, lower than, or equal to the stated rate of interest?

**accounting**

Acme Corporation issued $650,000, 8%, bonds for $720,000. Was the market rate on the date of issue higher than, lower than, or equal to the stated rate of interest?

**Geometry**

How do you find the apothem of a regular pentagon? Hexagon?

**Algabra 1**

Need help stuck on question. Find the range of f(x)=3g-5 for the domain (-1.5,2,4) A- (-8,10,-1,-1) B- (-9.5,1,7) C- (8,10,1,1) or D- (9.5,-1,-7)

**MATH- Algebra 2**

PRISM AND CYLINDER

**Pacific Union College**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 17.5 g of biphenyl in 28.8 g of benzene?

**math**

what is the area enclosed by x=sin(y) and x=(2Sqrt2/pi)y ?

**Science**

I guess, will I be able to compare hoe people remember numbers better with their eyes or ears?

**Science**

How do I draw a graph comparing eyes & ears. If you remember numbers better with your eyes or ears?

**physics**

F average= delta p/delta t delta p =MV2-MV1

**physics**

Romeo takes a uniform 13.7-m ladder and leans it against the smooth (frictionless) wall of the Capulet residence. The ladder's mass is 23.2 kg and the bottom rests on the ground 3.43 m from the wall. When Romeo, whose mass is 70 kg, gets 88.3 percent of the way to the top,...

**physics**

Romeo takes a uniform 13.7-m ladder and leans it against the smooth (frictionless) wall of the Capulet residence. The ladder's mass is 23.2 kg and the bottom rests on the ground 3.43 m from the wall. When Romeo, whose mass is 70 kg, gets 88.3 percent of the way to the top,...

**C code**

//INSTRUCTIONS //Your parser will read from input.txt //input.txt consists of a series inputs that you need to read. //each input is proceeded by a flag. //Each flag will be either I,C, or F. //I means int C means char F means float. //So for example //I 7963467 //means int 79...

**Math**

Find the minimum and maximum possible areas of a rectangle measuring 6 km by 11 km.

**Math**

Runner A crosses the starting line of a marathon and runs at an average pace of 5.6 miles per hour. Half an hour later, Runner B crosses the starting line and runs at an average rate of 6.4 miles per hour. If the length of the marathon is 26.2 miles, which runner will finish a...

**Math**

A truck traveling at an average rate of 45 miles per hour leaves a rest stop. Fifteen minutes later a car traveling at an average rate of 60 miles per hour leaves the same rest stop traveling the same route. How long will it take for the car to catch up with the truck?

**Alegebra**

If a kayaker's speed while traveling upstream is 7 miles per hour and downstream is 4 miles per hour. What is the kayaker's speed in still water? What is the speed of the current?

**C code**

Write a .c file named calc that: - Takes arguments from the command line - Solves a simple math problem - Returns the result as an exit status calc.c: //this is the function that gets called when the executable is run. int main(int argc, char * argv[]){ //I've given you th...

**English**

What point is Tan making with the example of her mother and the hospital in Mother Tongue by Amy Tan 1990?

**biology**

1. discuss the mechanisms that organisms undergo to accomplish morphogenesis 2. Describe the contributions of drosophila and nematodes in advancing understandings of development

**Physics**

a tuning fork of frequency 500 Hz is rotating on the edge of a disk of radius 1.2 meters. (a) If the disk turns at a rate of 40 rev/min, what are the maximum and minimum frequencies heard by the listener? (b) To what positions of the tuning fork do these frequencies correspond?

**Physics**

Identical points on two harmonic waves with the same wavelength (.65 meters) and frequency are separated by a distance of .15 meters. What is the phase difference between the waves?

**Physics**

When speaker A is working the sound intensity at a particular location is 85 dB. When speaker B is working (without speaker A), it is 80 dB. What will it be if both speakers are working together?

**biology**

1. discuss the mechanisms that organisms undergo to accomplish morphogenesis 2. Describe the contributions of drosophila and nematodes in advancing understandings of development

**Math **

A certain car is about 100in. long and 60 in. wide. You plan to make a model of this car that is 9 in. wide. How long will your model be?

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