Tuesday

January 17, 2017
Total # Posts: 101

**Chemistry**

Homework question? Colmanite [Ca2B6O11 * 5 H20] is a salt whose boron content gives glass high clarity. You are a buyer for an optical fiber manufacturer and want pure material. You have just received a Certificate of Analysis for a lot that is 12.8 +- 1.2% (i.e;11.6 to 14.0...

*October 26, 2016*

**Elementary Stats**

A box contains two red balls, four green balls, and two white balls. You extract balls from the box with replacement 100 times. Eachh time you extract a red ball, you win $1; a green ball, you lose $0.50; a white ball, nothing happens. -Make a box model of the net gain each ...

*October 26, 2016*

**Physics**

On vacation, your 1350 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 2.20 m/s2. (a) What is the net force exerted by the car on the trailer? (b) What force does the trailer exert on the car? (c) What is the net force acting on the car?

*October 20, 2016*

**Physics**

A 0.15 kg baseball is moving at 35 m/s toward home plate when it is hit with the bat. The ball is in contact with the bat for 0.0019 s, and leaves the bat at 25 m/s directly away from home plate. Determine the average force exerted by the bat on the ball.

*October 20, 2016*

**Algebra**

Find an equation of variation in which y varies jointly as x and z, and y=4 when x=4 and z=1. Simplify

*May 9, 2016*

**algebra/math**

Find the smallest value of x such that x^2+6x + 9 = 24 Please help me! I am very confused. Thank you!

*April 12, 2016*

**Math**

Andre left his campsite and paddled to a fishing hole 1.5 km downstream. He timed his trip and found that it took him 9 min, His return trip upstream took him 22.5 min. Determine the speeed at which he paddled and the speed of the river? what steps did u use

*February 22, 2016*

**Science**

What might be the functions of the chemical additives in body washes?

*February 17, 2016*

**chemistry**

what is thiosulphate

*February 16, 2016*

**Chemistry**

why is chemistry needed

*February 16, 2016*

**Math**

30+(30/2)=30+15=45

*February 16, 2016*

**Chemistry**

A weather balloon is inflated to a volume of 26.2 L at a pressure of 755 mmHg and a temperature of 32.5 ∘C. The balloon rises in the atmosphere to an altitude where the pressure is 360. mmHg and the temperature is -13.5 ∘C. Assuming the balloon can freely expand, ...

*October 27, 2015*

**chemistry**

A graduated cylinder contains 17.0 mL of water. What is the new water level after 31.6 g of silver metal with a density of 10.5 g/mL is submerged in the water

*October 7, 2015*

**Math**

How the crap do i do this.

*August 25, 2015*

**MATH**

Jenna always throws loose change into a pencil holder on desk and takes it out every 2 weeks. this time it is all nickels and dimes. There are 7 times as many dimes as nickels and the value of the dimes is $6.50 more than the value of the nickels. How many dimes does Jenna have?

*April 29, 2015*

**math**

Thank you

*April 14, 2015*

**math**

Numbers that are palindromes read the same forward and backward. For example, 30203 is a five digit palindrome. If a single number is chosen randomly from the set of all three-digit numbers, find the probability that it will be palindromic. Answer 1/10??

*April 14, 2015*

**math**

I hoping this is right. 3·2·2=12 Answer 12 ways.

*April 14, 2015*

**math**

Determine the number of odd, nonrepeating three digits numbers that can be written using digits from the set {1, 2, 3, 4}.

*April 14, 2015*

**Chemistry**

4.425

*February 16, 2015*

**physics**

A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe's diameter is 56.3 cm (0.563 m) and the flow speed of the petroleum is 13.5 m/s. At the refinery the petroleum flows at 5.65 m/s. What is the volume flow rate of the ...

*December 10, 2014*

**Physics**

the angular speed, or 4pi

*November 8, 2014*

**chem 2**

methylamine is a weak base. calculate the pH of a .025 M solution of methylamine.

*November 4, 2014*

**algebra2**

Please help me find the lcd (x+6)+(2x-1)

*October 10, 2014*

**Calculus**

An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water is being pumped out of a spout 2m above the top of the tank. Recall that the density of water is = 1000kg/m^3 (a) Find the work needed to empty the tank if it is full. Include units. (b...

*May 19, 2014*

**physics**

What is the absolute pressure at the bottom of a storage tank of oil 18-m deep that is open to the atmosphere? Take the density of oil to be 800 kg/m3.

*July 29, 2013*

**Chemistry**

A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g°C). As a result of the reaction, the temperature of the calorimeter increases from 22.00°C to 29.3&...

*July 8, 2013*

**Chemistry**

The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(g°C), how much heat is absorbed by ...

*July 8, 2013*

**chemistry**

In the reaction between formic acid (HCHO2) and sodium hydroxide, water and sodium formate (NaCHO2) are formed. To determine the heat of reaction, 75.0 mL of 1.07 M HCHO2 was placed in a coffee cup calorimeter at a temperature of 20.8 °C, and 45.0 mL of 1.78 M NaOH, also ...

*April 4, 2013*

**Math**

21 pairs of shoes or 42 shoes

*March 15, 2013*

**Math**

There are 9 boys and 12 girls at a party,everyone is wearing a pair of shoes.How many shoes are there

*March 15, 2013*

**Writing**

What are the five features of a letter.

*March 13, 2013*

**Math**

Fun video rents videos for $1 per video plus chafes a $5 membership fee. Your equation should represent the total cost for renting any number of videos. write an equation Function Table

*December 27, 2012*

**physics**

3 points particles with masses 4kg,2kg,3kg are at the corners of equilateral triangle of side m =2m.

*November 28, 2012*

**math**

i don't know but the question is to circle the object that is heavier(shoe,sock,feather,marble,brick and tape measure)i know a brick,and the tape measure is heavy but i'm not sure about the shoe and the marble

*October 27, 2012*

**math**

is a marble heavy more than 1 pound

*October 26, 2012*

**Physics**

left

*September 28, 2012*

**AP Chemistry**

1.A compound consists of 65.45% C, 5.492% H, and 29.06% O on a mass basis and has a molecular mass of 110 g/mol. Determine the molecular formula of the compound. 2. What is the formula weight of iron (II) sulfate? Answer in units of g/mol. 3. What is the % nitrogen by weight ...

*September 22, 2012*

**finance math**

A car dealer purchased 2 cars, one for $1500 and the other for $20000, He then sold the first car at a loss of 14% and the second car for a profit of 15%. Find the dealer¡¯s profit for the whole transaction and express the answer as a percentage of his total cost.

*August 27, 2012*

**Physics**

A man (80kg) jumps from a 17 storey balcony (51 metres). How long would it take for him reach the ground? ~Sorry for the morbid example, we were just having a chat about it lol

*July 3, 2012*

**physics**

The body in Fig. 10-37 is pivoted at O. Three forces act on it in the directions shown: FA = 13 N at point A, 6.4 m from O; FB = 17 N at point B, 3.6 m from O; and FC = 15 N at point C, 2.2 m from O. Taking the clockwise direction to be negative, what is the net torque about O?

*March 26, 2012*

**Physics**

An Olympic diver performs a dive from the 10 m platform and achieves a speed of 14 m/s just before entering the water. Neglecting air friction, approximately how many times larger the diver’s speed than the diver would have achieved by performing from a 1 m platform? How ...

*March 15, 2012*

**math**

The roof of a building is shaped like a square pyramid, with a base of 18m by 18m. If the slant height of the roof is 12m and roofing costs 5.75m2, how much will it cost for roofing material?

*February 29, 2012*

**math**

The roof of a building is shaped like a square pyramid, with a base of 18m by 18m. If the slant height of the roof is 12m and roofing costs 5.75m2, how much will it cost for roofing material? This is the last question for my homework could u answer this for me to find how much...

*February 29, 2012*

**Math**

A ball has a radius of 56mm a)Calculate the surface area b)what is the volume of the sphere could somebody please answer for my math homework I need help

*February 29, 2012*

**Math**

A cylindrical tin can has a radius of 4.5cm and a height of 5 cm (a)What is the surface area of the can (b)What is its volume? (c)What is the cans capacity could somebody please answer this question so i can get past with math

*February 29, 2012*

**Organic Chemistry**

How many moles of hypochlorous acid are needed to react with 0.621 mol of 9-fluorenol? please help

*February 1, 2012*

**chemistry**

Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf? a) FeO(s) + CO2(g) -> FeCO3(s) b) 1/2 N2(g) + 2 O(g) -> NO2(g) c) 2 Na(s) + Cl2(g) -> 2 NaCl(s) d) Ba(s) + N2(g) + 3 O2(g) -> Ba(...

*January 23, 2012*

**chemistry**

is it b?

*January 23, 2012*

**chemistry**

65.3?

*January 23, 2012*

**chemistry**

Calculate the value of DHo for the reaction 2 CH4 (g) -> C2H6 (g) + H2 (g) given the following thermochemical equations: C2H2 (g) + H2 (g) -> C2H4 (g) delta = – 175.1 kJ C2H6 (g) -> C2H4 (g) + H2 (g) Delta = + 136.4 kJ C2H2 (g) + 3 H2 (g) -> 2 CH4 (g) Delta...

*January 23, 2012*

**Physics**

A tennis player places a 64 kg ball machine on a frictionless surface. The machine ﬁres a 0.051 kg tennis ball horizontally with a velocity of 36 m/s toward the north. What is the ﬁnal velocity of the machine? Answer in units of m/s

*November 30, 2011*

**physics**

A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How far down range will he land?

*October 18, 2011*

**physics**

A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How many seconds will the teacher be in flight?

*October 18, 2011*

**physics**

A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. What is the maximum height the teacher will reach in his flight?

*October 18, 2011*

**physics**

A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. What is the teacher's horizontal velocity?

*October 18, 2011*

**physics**

A student laying on a building 54.0 m high shoots a pellet gun horizontally. If the pellet lands 156 m form the base of the building, what was the muzzle velocity of the gun?

*October 18, 2011*

**Rounding#'s**

use a calculator to find each rounded to 4 decimal places. 1) sec 15.2 degrees 2) an acute angle theta if csctheta= 1.38

*September 2, 2011*

**Math**

A train that is one mile long starts through a tunnel that is also 1 mile long. the train is traveling 15 miles per hour. how long does it take for the train to get completely through the tunnel?

*August 29, 2011*

**algebra1**

how do you figure out this answer.15.6+xforx=-17.9

*August 24, 2011*

**geometry**

Given: M is the midpoint of line segment PQ and line segment RS. Prove: line segment QR is congruent to line segment PS.

*March 11, 2011*

**geometry**

Triangle PQR has vertices P(0,12) Q(7,11) ans R(-2,2) Find the eaquation of the triangles median through point Q

*January 17, 2011*

**math**

change ratio to lowest terms.

*November 4, 2010*

**Hard Calculus**

f(x)= xsquared - 2x Determine whether y= f(IxI) is continous at x= 0 justify your answer

*September 23, 2010*

**Hard Calculus**

f(x)= xsquared -2x for y= absolute value of f(x) does the derivitive exist at x=0 and explain why.

*September 22, 2010*

**AP Physics**

first convert 600km/h to m/s then use the equation final velocity suqared = initial velocity squared plus 2 times aceleration times distance. remember initial is 0m/s. Then once you find acceleration use the equation final velocity equals initial velocity plus acceleration ...

*September 22, 2010*

**8th grade**

A leaky faucet fills a 100 millimeter cup in 10 minutes. 1.how much water is wasted in a day?a week?a non leap year? 2.How long does it take to waste a kiloliter of water? (hint:1 kiloliter=1000000 milliliters)

*August 19, 2010*

**chemistry**

wow didnt think of it that way. thanks a lot =)

*August 5, 2010*

**chemistry**

in a lab experiment to obtain the molar mass of a voltaile liquid, the following data is obtained: volume of flask=225ml mass of flask=77.834gms mass of flask+gas=78.416gms temperature=100 degrees celsius pressure=714 torr What is the molar mass of the liquid? A)11.1 g/mol B)...

*August 5, 2010*

**Is anyone here a chemistry genuis?**

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...

*April 9, 2010*

**social studies**

hi timmys mom here were trying to figure out this homework assignment... answer to question has secular moderate muslim governments i do not know what secular means to define to timmy for class oral read..i just know the teacher will ask if he knows what such and such are...i...

*March 2, 2010*

**social studies**

sorry to bother you again what does secular mean

*March 2, 2010*

**social studies**

hello, my homework page starts out with In 1979, muslim fundalists led a successful rebellion against the united states-backed shah of iran and took control of that country? my question is what country? i think the paper printed wrong were doing 1979 fundamentalists thanks

*March 2, 2010*

**physics**

knowns: F=20N h=15m V=25m/s unknowns: max h V1 work-energy theorem: W=K2-K1 K=.5*mV^2 so, m(-g)h=.5mV2^2-.5mV1^2 this simplifies to 2(-g)h=V2^2-V1^2 therefore, V1=sqrt(V2^2+2gh) now all you have to do is plug in numbers. V1=sqrt(25^2+2*9.8*15)=30.32m/s max height is where V=0 ...

*February 21, 2010*

**math**

Bronze cocnsists of 6 parts tin to 19 parts cooper. How amny pounds of tin are there in a 500 lb. bronze statue? What is the formula for getting the answer?

*February 1, 2010*

**Math**

If a mixture requires 2 parts water to 3 parts of alcohol what percentage of mixture is water. How do I work this problem?

*February 1, 2010*

**equal group riddles**

my answer is 25

*January 30, 2010*

**precal**

solve cos(squared)x + sinx = 1 {0, 2pie)

*January 12, 2010*

**math**

40 degrees 60 degrees and 80 degrees

*January 12, 2010*

**3rd grade**

why does a tennis ball go furthur than a beach ball? force and motion question

*October 8, 2009*

**web 1**

what do most virtual encyclopedias require after a trial period

*September 16, 2009*

**precalculus**

find the additive inverse of the number 6- pi and -7

*September 9, 2009*

**Does this sound ok?**

I think you need to work on your grammar skills, missy!

*April 29, 2009*

**science**

how many grams of copper sulfate pentahydrate (CuSO4 5H2o) would you heat to produce 29.8 grams of water?

*March 18, 2009*

**MATH**

What is the area of the region bounded by the lines x=1 and y=0 and the curve y= x-e^x^2? A. 1-e units squared B. e-1 units squared C. (e-1)/2 units squared D. (1-e)/2 units squared or E. e/2 units squared if you can show me how to get that please

*February 23, 2009*

**English**

Thanks

*April 27, 2008*

**English**

Pronoun case for who and whom 23a. Jon Bon Jovi, who is a well-known singer and actor, also owns an arena football team. 23b. Jon Bon Jovi, whom is a well-known singer and actor, also owns an arena Please what is the correct answer? I chose (A).

*April 27, 2008*

**chemistry**

a sample consisting 22.7g of a nongasous unstable compound X is placed inside a metal cylinder with a radius of 8Cm and a piston is carefully placed on the surface of the compound so that for all practical purposes the distance between the bottom of the cylinder and the piston...

*April 21, 2008*

**Criminal law**

"self induced intoxication negates mens rea, hence no crime is committed" justify the statement.

*February 18, 2008*

**economics**

thank you economyst. I have been doing it correctly :) except for industry supply curve as 50q-500. Is that correct?

*November 14, 2007*

**economics**

am i doing this correctly? total output = 1000. output of each firm 20. number of firms 50. ?finding equilibrium price and profits from firms?

*November 13, 2007*

**economics**

perfectly competitive industry. Each firm having identical cost structures. long-run average cost is minimized at an output of 20 units. Minimum average cost is $10 per unit. total market demand is Q=1500-50P. What is the long-run equilibrium price? Total industry output? ...

*November 13, 2007*

**microeconomics**

yes, subscript i. don't know how to type that here. i don't have my equations with me so i'm still not quite sure how to get the equilibrium and profits? (did i do the other correctly?) There is a lot more for this problem too. I will probably be asking more ...

*November 13, 2007*

**microeconomics**

perfectly competitive. So horizontal supply schedule?

*November 13, 2007*

**microeconomics**

This is what I have, qi=20, AC(average cost)=10, and (total market demand) Q=1500-50p. What is the industry's long-run supply schedule?

*November 13, 2007*

**the big idea of energy**

I'm also doing the Iron/Sulpher thing. I've gotta make a poster and I need to explain the reaction using the Big Idea of Energy but I don't know what it is can any one help???

*December 5, 2006*

**?**

what happens the first time that buck answers the call of the wild? http://www.sparknotes.com/lit/call/ =)

*November 29, 2006*