Saturday

August 27, 2016
Total # Posts: 663

**Chemistry **

What are the equilibrium concentrations of all the solute species in a 0.95 M solution of hydrogen cyanide, HCN? The Ka value = 6.2 x 10^-10. (a) [H3O+], M; (b) [OH-], M; (c) [HCN], M; (d) What is the pH of the solution? For HCN So far i have calculated the concentration of ...
*August 14, 2016*

**math**

to determine whether a person has as thyroid deficiency, a radioactive iodine with a half-life of 8.2 days is injected into the bloodstream. a healthy thyroid is able to absorb all of the radioactivity. the amount, R, of radioactivity present after t days can be modeled by the...
*May 31, 2016*

**social studies**

what are three advantages of visiting the city-state of sparta (cultural activities, recreation, athletics, sports, architecture, and famous sites) What are 2 travel alerts that warn tourist some the dangers they might encounter while staying in sparta PS: This is ancient sparta
*May 17, 2016*

**Math**

A banner is shaped like a parrelelogram. The banner has a base length of 3.25 meters and an area of 4.55 square meters. Explain how to find the height of the banner
*May 17, 2016*

**Social studies**

What are 3 advantages of visiting the city state of Sparta What are 2 travel alerts in Sparta (in ancient times)
*May 17, 2016*

**Chemistry **

How do you transform an alcohol into an alkene? The example I need help with is: What are the reagents to transform 1,2-dimethyl-propanol to 4,5-dimethyl-2-hexene? This must be done in two steps.
*May 7, 2016*

**Chemistry **

What are the possible reagents needs to transform 1-butene to 2-butene? This can be done in two steps.
*May 7, 2016*

**Math**

I'm a fraction that is equivalent to 1/2 my sum of numerador and denominator is 15 what fraction I'm?
*April 28, 2016*

**macroeconomics**

11 - 7. (Fiscal Policy) Increased government purchases, with taxes held constant, can eliminate a recessionary gap. How could a tax cut achieve the same result?
*April 26, 2016*

**Calculus**

The Riemann sum s for f(x)=4x^2, 0<=x<=1, taking the sample points to be the right endpoints is given by s=4n^2+6n+2/3n^2. True or False?
*April 19, 2016*

**Calculus (Urgent, please)**

Find the area of the region enclosed by the intersection of the circle x^2+y^2=4 and the parabola y=x^2. Show work
*April 19, 2016*

**Calculus**

Use the function f to solve the following: a) Local minima, local maxima, and stationary points if any. Show work. b)Intervals of upward concavity and downward concavity if any. Show work. c) Inflection points if any. Show work. f(x)=2x+1/x-2 Please, don't do steps for ...
*March 29, 2016*

**Chemistry**

Or would it be q system = - (q water + q calorimeter) ????
*March 28, 2016*

**Chemistry**

We're doing a spontentaity lab in chemistry and I wanted to make sure I was using the right equation to do the questions! Could someone make sure this is right?? q system = - (q water - q calorimeter)
*March 28, 2016*

**Equilibrium Consentration **

At a certain temperature, the reaction H2(g)+ Cl(g)=2HCl(g)has Kc = 5 x 10^8. If a reaction mixture at equilibrium contains 0.48 M of H2 and 0.23 M of Cl2, what is the concentration of HCl? I was wondering if I had to rearrange the equilibrium constant equation to work out the...
*March 28, 2016*

**Calculus**

Determine whether the hypotheses of the Intermediate-Value Theorem are satisfied. f(x)=x^1/3 , [a,b]=[-1,1] Please, explain. Thank you.
*March 28, 2016*

**electronics**

how to compute charging and discharging time of capacitor in voltage to frequency converters.
*March 27, 2016*

**Chemistry **

How many grams of ammonia (NH3) will be produced when 0.281 grams of nitrogen are combined with hydrogen?
*March 23, 2016*

**C programming**

1.write a C program to reverse the elements of array using recursive function(without using for and while loop). 2. write a C program to check the occurrence of an element in array using recursive function(without using for and while loop)
*March 15, 2016*

**coding**

1.write a C program to reverse the elements of array using recursive function(without using for and while loop). 2. write a C program to check the occurrence of an element in array using recursive function(without using for and while loop).
*March 15, 2016*

**Climate Physics**

Find the insolation in Wm^-2 at summer solstice for a low obliquity of 22 degrees? I used the following: h_0=cos^-1(-tan(phi)* tan(delta)) cos(theta)=[sin(phi)*sin(delta)+cos(phi)*cos(delta)*cos(h_0)] Result was 397 Wm^-2 This looked like an easy problem, but I am having ...
*March 5, 2016*

**Science**

Yes you are correct!
*March 2, 2016*

**electronics**

Full Wave Rectifier With Zener Regulator : what is the maximum load current the zener regulator can supply? given that Iz(min)=5mA(current through zener diode) and the maximum power dissipation in the zener is (1/2)W.
*February 20, 2016*

**electronics**

1. if the peak amplitudes of waves in case of full wave rectifier are not equal, what could be the reason? 2. in case of full wave rectifier with zener diode why does poor regulation of some I(current through the load resistance) occur?
*February 20, 2016*

**Earth science**

Shygirl and Ms. Sue are correct...
*February 19, 2016*

**maths**

Let (xk) ⊂ Rn and x ∈ Rn: Show that xk → x in Rn if and only if for every y ∈ Rn the sequence (⟨xk; y⟩) ⊂ R converges to ⟨x; y⟩, that is, ⟨xk; y⟩ → ⟨x; y⟩ in R.
*February 14, 2016*

**programming**

write a C function which takes a natural number as argument and calculates the product of sum of its digits. A sum-product number is natural number that equals the product of sum of its digits and the product of digits.
*February 9, 2016*

**programming**

write a C function which takes natural number nas argument and calculate the sum of the digits raised to the power of the number of digits in n.
*February 9, 2016*

**Math**

A girl has $3.35 in her pocket, consisting of dimes and quarters. If there are 23 coins in all, how many of each does she have?
*February 4, 2016*

**biology**

1.Why do Bacteria and yeast synthesize fatty acids with more cis-double bonds when surrounding temperature drops? 2.Despite fluidity of bilayer, why do liposomes not fuse spontaneously with one another?
*January 30, 2016*

**english**

Which phrase is italicized?
*January 26, 2016*

**Chemistry**

Okay so, the average k-value(temperature) for a group of heavy gas species is 6.78 and the average k-value for a group of light gas species is 6.17 Then there's that question.
*January 26, 2016*

**Chemistry**

How does the molecular wight of the gas affect the k-value?
*January 26, 2016*

**Calculus**

(3) Suppose that f : R2 → R is a continuous function at x0 ∈ R2 and that |f(x0)| > 2. Show that there is a $ > 0 such that |f(x)| > 2 whenever ||x − x0|| < $.
*January 17, 2016*

**Biology/Chemistry**

Does anybody know how much 1 mole of acid should be diluted in order to mimic the pH of acid rain? I also need sources, but haven't been successful in any of my searches so far, thanks.
*January 6, 2016*

**Social Studies and Science**

Why is water warmer in colder weather than in warmer weather? Thanks!
*December 9, 2015*

**Math**

Megan completes most puzzles in 24 minutes. Hassan completes most puzzles in 16 minutes. If Megan and Hassan complete a puzzle together, how long will it take?
*December 8, 2015*

**Physics**

A gardener waters a lawn. the hose ejects 5*10^-4 m^3 of water per second. The area of the mouth of the hose is 5 cm^2. Find the backward force exerted on the gardener.[density of water=10^3kg/m^3]
*November 14, 2015*

**Physics**

A railroad freight car with a mass of 50,000 kg is rolling along a level track at 0.30 m/s. A rope trails behind it. If the maximum force you could apply to stop the cart is 250 N, what is the shortest amount of time (measured in seconds) it would take for you to bring it to ...
*October 23, 2015*

**chemistry**

If the titre value of the experiment were 20.50, 22.45, 22.6, typical experiment in a laboratory, 4.50g of sulphuric acid in 250cm^3 of water was titrated with an impure solution of 5.24g of sodium hydroxide contained in 1dm^3.
*October 20, 2015*

**English**

Word bank Coerco Intervene I. 1) I looked forward to this arrival with __. (n) 2.) Take raincoats if you __ bad weather. (v) 3.) They used ___ to get answers. (n) II. 1.) Hire some more people to ___ the work. (v) 2.) Can be done ___ if we had more workers. (adv)
*September 20, 2015*

**Medical**

True or False There's no cure for ALS
*September 20, 2015*

**sfx**

The dependent variable is the same amount of lime water, the independent variable is the colour changer of the lime water. The variable is the mouthpieces used
*August 23, 2015*

**Urgent math pls **

The noise from a power mower was measured at 108 dB. The noise level at a rock concert was measured at 119 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest whole number.) I tried by 108-119 =-11 but then I did ...
*August 11, 2015*

**Urgent math quick**

A roasted turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 75°F. (a) If the temperature of the turkey is 150°F after half an hour, what is its temperature after 45 min? (Round your ...
*August 11, 2015*

**please help urgent**

Find the total amount to be paid over the life of the 30-year mortgage and on the 15-year mortgage. 30-year $ 15-year I also tried doing the same method this way but it didn't work? can you show me how?
*August 10, 2015*

**please help urgent**

I got 2823.82 is this correct?
*August 10, 2015*

**Math **

an = 3a(n − 1) + 6 and a1 = 1 a4=87 a5=249 this is what I got but the answer were incorrect in the sequence.
*August 10, 2015*

**Math **

so I was trying to do this based on logarithm scales. The noise from a power mower was measured at 108 dB. The noise level at a rock concert was measured at 119 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest ...
*August 10, 2015*

**Math **

so just to clarify the answer is 37.313 or 9.3? if i was to round to two decimal places
*August 10, 2015*

**Math **

Can anybody show me step by step pls? A man invests $3000 in an account that pays 7.5% interest per year, compounded quarterly. 1. Find the amount after 3 years? (Round your answer to the nearest cent.) how much $? 2. How long will it take for the investment to double? (Round ...
*August 10, 2015*

**physics**

How many grams of Al2O3 are formed from 15L of O2 at 97.5kPa and at 21degree celcius.
*August 7, 2015*

**physics**

A gas at 250K and 15atm has a molar volume smaller than calculated from perfect gas law Calculate: a) the compression factor under these conditions b) the molar volume of gas
*August 7, 2015*

**History **

Which view of the Establishment Clause would allow greater interplay between government and religion? A. conscientious theory B.accommodationist view C.separationist view D.high-wall theory can any body help me i think its A. conscientious theory but not sure at all.
*July 31, 2015*

**Trigonometry**

Two ships leave a harbor entrance at the same time. The first ship is traveling at a constant 10 miles per hour, while the second is traveling at a constant 22 miles per hour. If the angle between their courses is 100°, how far apart are they after 2 hours? (Round your ...
*July 30, 2015*

**History **

Who was primarily responsible for drafting the Bill of Rights? A.Thomas Jefferson B. Thomas Paine C.James Madison D.Benjamin Franklin
*July 23, 2015*

**History **

The right to a fair trial in federal cases stems from what constitutional source? A. The Sixth Amendment Speedy Trial Clause B.The Fifth Amendment Just Hearing Clause C. The Fourth Amendment Speedy Trial Clause D. The Fifth Amendment Due Process Clause i am struck
*July 23, 2015*

**health**

what can a person do to relax his muscles?
*July 13, 2015*

**Calculus(math)**

Is there a way to do this without taking the integral of the equation which is what I believe you did? I'm just beginning integral calculus so we are still doing more basic methods.
*June 21, 2015*

**Calculus(math)**

A particle is moving on a straight line in such a way that its velocity v is given by v(t)=2t+1 for 0≤t≤5 where t is measured in seconds and v in meters per second. What is the total distance traveled (in meters) by the particle between times t=0 seconds and t=5 ...
*June 21, 2015*

**Language Arts**

ALGERNON Bring me that cigarette case Mr. Worthing left in the smoking-room the last time he dined here. LANE Yes, sir. [LANE goes out.] JACK Do you mean to say you have had my cigarette case all this time? I wish to goodness you had let me know. I have been writing frantic ...
*June 3, 2015*

**Language Arts**

The Passage is "The Trouble of Being Earnest" Which statement best expresses a theme of the passage? Some secrets are better left as secrets. Rules change depending on the situation. Marriage changes a person. Nothing is as it seems. I'm stuck between C and D Help?
*June 2, 2015*

**Language Arts**

Did you end up getting the answer?
*May 16, 2015*

**math**

if you know the area of a square how do you find the length of the square?
*April 26, 2015*

**Physics**

A rectangular wire loop has a 10 ohm resistor on the back as it moves into a region of uniform B=3T field at v=10m/s. The rectangle is w=5cm wide and l=20cm long. How much heat is generated in the resistor during the loop's entire path into and out of the magnetic field in...
*April 19, 2015*

**math**

what is the linear velocity of a point in Sydney, Australia which is at latitude 33deg 55'S. Radius of earth is 6370km.
*April 12, 2015*

**math**

One angle is 10 degrees more than 4 times the other. Find the measure of each angle if a) they are complimentary, and b) they are supplementary
*April 11, 2015*

**psychology**

analyse the tenants of psycholanalsis
*April 6, 2015*

**Physics **

A force of 112 N acts on 35 kg box which moves at a steady speed across the floor. The force is directed 40 degrees above the ground. How to state Newton's second law using x components and y components? x: -Fa(cos40) -Ff=ma and y: -Fa(sin40)+Fn-Fg=0? How do you calculate ...
*March 25, 2015*

**Math**

Thank you Ms. Sue to my question on the coin collection. I just haven't figure out when to divide and when to multiply with these word problems this past week. So my answer will be 2/3 times 13/25 = 26/75 Thank you and have a nice evening.
*March 13, 2015*

**Math**

Of the coins in my collection, 13/25 are quarters. Of these quarters 2/3 are state quarters. What fraction of my coins are state quarters? I think I need to divide 13/25 by 2/3 and my answer will be 39/50. Is this correct. Thank you for your help.
*March 13, 2015*

**Math**

Jan has 1/3 hour to warm up for her dance recital. She must complete each of 6 different stretches. How long, in hours, does she spend on each type of stretch if she spends an equal amount of time on each type of stretch? I think it would be 1/3 divided by 6 for an answer of 1...
*March 12, 2015*

**math**

12/35 stamps are from Asia. Of these Asian stamps 5/16 are from Thailand. What fraction of the stamp collection are from Thailand? I want to think I need to divide but I'm not sure it makes sense. 12/35 divided by 5/16= 12/35 times 16/5 = my answer of 192/175. Is this ...
*March 11, 2015*

**Math**

Dear Ms. Sue, Thank you for helping me very much. I was a little confused on your response to your answer posted at 7:23. Would my answer be 18 instead of 12? Thank you!
*March 9, 2015*

**Math**

using a circle graph of 1/3 percussion, 2/5 brass, 4/15 woodwind and also a circle graph of 1/3 woodwind, 1/6 percussion, 1/2 brass. Both bands combine as one band. A. What fraction of the band members will play brass instruments? B. what fraction of band members will play a ...
*March 9, 2015*

**Math**

using a circle graph with 1/3 percussion, 2/5 brass, 4/15 woodwind. There are 30 musicians in the band. How many of them play bass instruments? I think I have to multiply 30 times 2/5 and in simplest form my answer would be 12. Is this correct?
*March 9, 2015*

**Math**

working with a circle graph divided up into 1/3 woodwind, 1/6 percussion, and 1/2 brass. The marching band has three percussion musicians. How many musicians altogether are in the band? I think I have to add all of the fractions together and my answer is in simplest form so it...
*March 9, 2015*

**Math**

Sara long jump was 10 feet. That is 5/6 foot longer than Tom's long jump. Did Tom jump more or less than 10 feet? I think I have to multiply and so Tom's jump was less by . I think his jump was 8 1/2 feet. Is tis correct?
*March 3, 2015*

**Math**

Bill plays ball for 9 hours each week. His friend Mark spends as much time playing ball. Who plays more ball? I think I have to divide. So I think Mark plays more ball by 10 4/5 hours. Is this correct? Thank you so very much for your help Ms. Sue.
*March 3, 2015*

**Math**

Hank's fish bowl holds 9/10 gallon of water. It is now 2/3 full. How much water is in the bowl? I subtracted and my answer is 7/30. Is this correct?
*March 3, 2015*

**Math**

I can throw a ball 10 1/3 yards. My cousin can throw a ball 13 1/12 yards. How much farther can my cousin throw the ball? I think I have to subtract and my answer is 2 3/4 yards farther. Is this correct?
*March 3, 2015*

**Math**

Amy uses 8 cups of flour to make 3 identical loaves of bread.How much flour is in each loaf? I think it is division and I got 2 2/3 cups of flour. Is this correct?
*March 3, 2015*

**Math**

Sue's kitten eats 1/12 pound of food everyday. If Sue buys food in 5 pound bags, how many days does one bag of food last? I think I would divide and the answer would be 60 days is this correct?
*March 3, 2015*

**Math**

Bill can ride his bike 7 1/2 miles in a hour. a. How far will he ride in 3 hours? b. How far will he ride in 1/3 of an hour? I think for a. the answer is multiply so it would be 22 1/2 miles and for b. it would be 2 1/2 miles. Is this correct?
*March 3, 2015*

**math**

Mark is running 5 kilos. He decides to break the run into 3 equal lengths. How long will each length be? I think it would be 5 divided by 3 and my answer would be 1 2/3 for each length. Is this correct?
*March 2, 2015*

**math**

Thank you Ms Sue for your help. I meant to type dime instead of lime. So it should of been 192 dimes. That would make more sense.
*March 2, 2015*

**Math**

Tony wants to study 5 hours for the reading test. If he reads 1/3 hour per night, how many nights will he have to study? I think it is 5 divided by 1/3 so is it 15 nights that he would study?
*March 2, 2015*

**math**

a rectangle has a area 3 square feet and width 1/2 foot. What is the length of the rectangle? I think it is 3 times 1/2 equals 1 1/2 feet. Is this correct?
*March 2, 2015*

**math**

a rectangle has length 3 feet and width 1/4 foot. What is the area of the rectangle? I think it is 3 x 4 equals 12 feet. Is this correct?
*March 2, 2015*

**Math**

Bill has 180 coins. Of these coins, 1/12 are dimes. About how many dimes does he have? I think I have to divide . 180 divided by 1/12 equals 15 dimes that he has. Is this correct?
*March 2, 2015*

**math**

a lime weighs 1/12 ounce. Sue has 1 pound of limes. About how many limes does she have. I think I have to multiply 16 times 1/12 and I got 192 limes. Is this correct?
*March 2, 2015*

**Electricity and magnetism**

Thank you for your help. I am not sure what you mean by k.
*February 23, 2015*

**Electricity and magnetism**

A carbon atom's nucleus and its electrons become separated by 20nm. How much work does it take to separate them in Joules? In the previous problem if found that the magnitude of the force the nucleus feels towards the electrons is 2.07*10^11N. My first attempt was W=F*d = ...
*February 23, 2015*

**PHYSICS Electricity**

Maurice, I am having trouble too.
*February 19, 2015*

**Social Studies**

just to let you know i don't want the straight answer just an explanation
*February 18, 2015*

**Social Studies**

I am having trouble under standing these questions can someone please help? 11. What resources led to the appearance of the Industrial Revolution in New England? (5 points) 12. During the early 1800s, the United States tried to make peace with other countries in order to grow ...
*February 18, 2015*

**Chemistry**

What happens when sulphur reacts with iron? Does it make any colours before it turns dark grey? Does it do anything significant that I should need to know? I know that it is an exothermic reaction but is that it? Please help, Thanks.
*February 12, 2015*

**chemistry**

A moon rock collected by a U.S. Apollo mission is estimated to be 4.50 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.150 g of 238U in the rock? The half-life of 238U is t1/2...
*February 11, 2015*

**Chemistry**

The average concentration of chloride ions (molar mass = 34.353) in seawater is 19.353 grams per kilogram. The maximum allowable concentration of chloride ion in drinking water is 250 ppm by mass. How many times as much chloride ion is there in seawater than the maximum amount...
*January 22, 2015*

**Math**

The container is coated with 2 layers of specialty paint that costs $6.05 per jar. Each jar of paint covers 800cm^2. How much does the paint cost?
*January 21, 2015*