Tuesday

May 3, 2016
Total # Posts: 978

**CHemistry - help needed**

I performed a "related substances" test using HPLC on 1 sample. The 1st value for an impurity is 0% (not detected) and the 2nd value is 0.3%. THe passing limit is 4% for this test. Are the results acceptable, i.e. to take the average of the 2 values to give 0.15%?
*August 11, 2011*

**Physics**

Thank you so Very Much :))
*August 5, 2011*

**Physics**

What are the independent and dependent variables in the following scientific investigation? Controlled variables are also being used in this investigation. Identify the controlled variables as well. A chemistry student is conducting an experiment to determine if table salt ...
*August 5, 2011*

**physics**

The circuit shown in the figure encloses an area of 25 cm2. The magnetic field increases steadily from 0 T to 0.50 T in 0.2 ms. What is the current in the resistor during this time? The circuit has a 9.0 v battery and a 20 ohm resistor
*August 2, 2011*

**think build live success**

Hello-this is Elizabeth Kemler..you seem to be referencing my program and I'm interested in how you came upon it and how you're using it. Please let me know.
*July 24, 2011*

**Chemistry**

how many mL of 2.0 M NaOH are required to get 100 g of NaOH?
*July 16, 2011*

**Chemistry**

how many mL of 2.0 M NaOH are required to get 100 g of NaOH?
*July 16, 2011*

**Finance**

1. A man establishes an annuity for retirement by depositing $50,000 into an account that pays 7.2% compounded monthly. Equal monthly withdrawals will be made each month for 5 years, at which time the account will have a zero balance. Each year taxes must be paid on the ...
*July 11, 2011*

**math**

In 1995, the life expectancy of males in a certain country was 62.1 years. In 1999, it was 65.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1995. what is the linear function? Use the function to predict the life expectancy...
*July 10, 2011*

**chemistry**

a 500ml sample of oxygen gas at 24 degree celsius was prepared by decomposing a 3% aqueous soution of hydrogen peroxide in the presence of manganese catalyst by the reaction: 2h2o2 = 2 h20 + o2... the oxygen was colletec by displacement of water. the total pressure of gas ...
*July 10, 2011*

**Chemistry**

a tank contains a mixture of 3.0 mol of nitrogen gas, 2.0 mol of oxygen gas and 1.0 of carbon dioxide gas at 25 degrees celsius and a total pressure of 10.0 atm. Calculate the partial pressure in torr of each gas in the mixture?
*July 10, 2011*

**microeconomics**

Sam Johnson started a small machine shop, Machines, Inc., in his garage and incorporated it in March of 2002 as a calendar-year corporation. At that time, he began using his personal computer and tools solely for the business as part of his contribution to the corporation. The...
*July 3, 2011*

**finance**

Entrepreneur Edward is planning to open a business selling ice cream. He knows that the price of ice cream is determined by the forces of supply and demand, but he wants a report outlining five specific events that can be expected to cause the equilibrium price of ice cream to...
*July 3, 2011*

**finance**

On June 26, 2004, Elaine purchased and placed into service a new computer system costing $8,000. The computer system was used 80 percent for business and 20 percent for personal use in both 2004 and 2005. Elaine claimed only regular MACRS depreciation. In 2006, the computer ...
*July 2, 2011*

**finance**

On June 26, 2004, Elaine purchased and placed into service a new computer system costing $8,000. The computer system was used 80 percent for business and 20 percent for personal use in both 2004 and 2005. Elaine claimed only regular MACRS depreciation. In 2006, the computer ...
*July 2, 2011*

**Chemistry**

How do you know which reactions are spontaneous? For example, the equation I2(s)+2NaF(aq)->F2(g)+2NaI(aq) is spontaneous. Why is this so?
*June 22, 2011*

**college chemistry**

why do halogens tend to form diatomic molecules?
*June 17, 2011*

**chemistry**

If 1500 blood cells were lined up, they would make a row 1.0 inch long. What is the average diameter of the blood cells in micrometer(If l inch = 2.54cm)?.
*June 9, 2011*

**maths**

how can i slove 5x-2(x-5)=15
*May 30, 2011*

**Physics**

How Fast would a satellite have to move to stay in an orbit 300 miles above the Earths surface?
*May 22, 2011*

** Literature**

What role does fate play in the events of Romeo and Juliet? How are the young lovers victims of misunderstandings, miscommunications,and plain bad luck? How do these elements affect the way readers and audience members are affected by their story?
*May 17, 2011*

**Maths**

AB II CD meet at E find out the angle E.
*May 17, 2011*

**physics**

.250 kg toy airplane is suspended from the ceiling in a conical pendulum. It flies with a radius of 10 cm, and has a period of 20 seconds. Find the centripetal force acting on the plane?
*May 14, 2011*

**ela**

shrimp
*May 10, 2011*

**ela**

wut do i like to eat?
*May 10, 2011*

**maths**

What is the gradient of a line that has an angle of inclination of 75°? Enter the answer, rounded to 4 significant figures in the box below. the answer should be a number. ???
*May 8, 2011*

**Com/155**

Did I pick the correct pronoun? I had to sit down with my sister the other day about her spending habits. Her being the pronoun.
*May 6, 2011*

**algebra 2**

can someone tell me how to expand the bionomial (d-2)^6?
*May 6, 2011*

**math**

A card is pulled from a well shuffled deck of standard playing cards and then put back in the deck. A second draw is made from the deck. What is the probability that an ace was drawn both times?
*April 29, 2011*

**math**

A bag contains 7 red checkers and 11 black checkers. One checker is drawn and replaced. Then a second checker is drawn. What is the probability that a red checker was drawn both times?
*April 29, 2011*

**math**

A card is pulled from a well shuffled deck of standard playing cards and then put back in the deck. A second draw is made from the deck. What is the probability that an ace was drawn both times?
*April 29, 2011*

**math**

Marcus flips a coin and tosses a six-sided die with the sides numbered 1-6. What is the probaility that he gets a head on the coin and a number divisible by 3 on the die?
*April 29, 2011*

**Physics**

A railroad car with a mass of 1.93 104 kg moving at 3.24 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.16 m/s. (a) What is the speed of the three joined cars after the ...
*April 24, 2011*

**Microeconomics**

Search: Consider two resource markets in which the demand curves slope downward. In market A, the supply curve is horizontal, equilibrium price is $6, and 100 units of the resource are hired. In market B, the supply curve is vertical, equilibrium price is $20, and 30 units of ...
*April 24, 2011*

**Physics**

A 74.5 kg ice skater moving to the right with a velocity of 2.62 m/s throws a 0.21 kg snowball to the right with a velocity of 23.8 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*April 24, 2011*

**maths**

I THINK I GOT IT ITS NEGATIVE AS THE COEFFIENT IS -X^2 WHICH IS NEGATIVE. IS THIS RIGHT?
*April 23, 2011*

**maths**

the graph of y=-(x^2/3)=2x=24 is a parabola. 1) is the parabola u-shaped or n-shaped. how can you tell this from the equation?
*April 23, 2011*

**Character Buidling**

My Character Building Teacher had given me a project to write the names of the people we hate on a non-boiled raw potato, and put it inside a clear plastic, locked, and not to be opened until the project is finished. Everyday, we should take an observation of the potato and ...
*April 23, 2011*

**physics**

An 85.4 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 22.4 m behind the ship, at rest relative to the spaceship. The only way to return to ...
*April 20, 2011*

**Physics**

Two billiard balls with identical masses and sliding in opposite directions have an elastic head-on collision. Before the collision, each ball has a speed of 20 cm/s. Find the speed of each billiard ball immediately after the collision.
*April 20, 2011*

**maths**

My kids are stuck on this they've no idea what to do and I can't help them out either! Darren throws a stone from the top of a vertical cliff into the sea below. The trajectory of the stone can be modelled by the quadratic equation y = -(x^2/3)+2x+24 where y represents...
*April 20, 2011*

**Character Buidling**

My Character Building Teacher had given me a project to write the names of the people we hate on a non-boiled raw potato, and put it inside a clear plastic, locked, and not to be opened until the project is finished. Everyday, we should take an observation of the potato and ...
*April 17, 2011*

**math**

Manuel wants to calculate how many miles his farthers car travels on one gallon of gas. He knows that on a fu 15- gallon tank of gas, the car can travel 225 miles. Write an proportion that he could use to calculate the cars mileage per gallon(x)
*April 13, 2011*

**finance**

1–2 pages Details: Develop a personal financial planning budget. This budget can represent a budget for a fictitious individual; however, make sure you include the following: Information you would need to prepare this budget Income Taxes Expenses Personal expenses
*April 11, 2011*

**physics**

During peak shopping season at Northbrook Court, an escalator elevates 1233 passengers a vertical distance of 7.43 meters over the course of 30.3 minutes. If the average mass of the passengers is 55.3 kg, determine the power delivered by the escalator to the people.
*April 11, 2011*

**Physics**

A person doing a chin-up weighs 710 N, disregarding the weight of the arms. During the first 26.5 cm of the lift, each arm exerts an upward force of 356 N on the torso. If the upward movement starts from rest, what is the person's speed at this point?
*April 11, 2011*

**Physics**

A skier of mass 73.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 58 m up a 32° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*April 11, 2011*

**law**

english law. what are the powers of the court of appeal.
*April 9, 2011*

**law-- **

discuss whether or not the changes to the selection of judges is leading to a wider cross section of people becoming judges. please help thanks
*April 9, 2011*

**English huckleberry finn**

The book ends with Huck saying he's going to "light out for the Territory ahead of the rest." But there's a part of me that wonders if he won't decide to go back home to the Widow's with his friends. * Write a short paragraph or two to make another &...
*April 7, 2011*

**English**

Huck struggles to decide what he should do when his heart and his conscience pull him in different directions. He eventually decides to go with his heart. * Write a short essay explaining why you agree or disagree that this was a good strategy for Huck to pursue. * Look back ...
*April 7, 2011*

**world history**

Well, actually I think this was not present day.
*April 5, 2011*

**world history**

English and French are official languages of Canada. Laws promote French culture and language. Literature may be published in French and English. They made Quebec a separate country.
*April 5, 2011*

**world history**

Which is NOT a way in which the Canadian government attempted to cooperate with French separatists?
*April 5, 2011*

**World History**

In what regions did Latin Christendom expand during the period of the early Mongol expansion?
*March 30, 2011*

**maths**

A ball is launched into the air from below a cliff. after t seconds its height above the cliff top is h metres, and is given by the equation h = − 4.9t 2 + 19.6t − 14.6. Calculate, to the nearest metre, the ...
*March 29, 2011*

**A level law**

what are the disadvantages of the current system of training barristers and solicitors ( in england ) thank you
*March 29, 2011*

**A level law**

what are the disadvantages of the current system of training barristers and solicitors please help
*March 29, 2011*

**maths**

The following quadratic equation has the integer solutions x^2+5x-6=0 what is the positive solution of the equation
*March 29, 2011*

**maths**

Calculate the discriminant of the quadratic expression 4x^2-x-3
*March 29, 2011*

**Geometry**

The surface areas of two similar figures are given. The volume of the largwe figure is given. Find the volume of the smaller figure if the SA= 25 cm SA= 36cm and the V= 216cm?
*March 22, 2011*

**physics**

7.03m/s
*March 20, 2011*

**7th grade math pre algebra**

Thank you Ms. Sue
*March 10, 2011*

**7th grade math pre algebra**

I'm confused about this math question my teacher gave us today. Bowser's dog food is 40% meat. How much dog food would Bowser eat in order to get 11 kgs of meat?
*March 10, 2011*

**law**

which types of sentence would be most approppiate where the main aims of sentencing are rehabilitation and reform
*March 5, 2011*

**A level law**

discribe the custodial, community and other sentences available for adult offenders convicted in the crown court. 2. which types of sentences would be more appropriate where the main aims of sentencing are rehabilitation and reform thank you
*March 2, 2011*

**Measurment**

What is the area of this triangle with 22,16,28 And a nine in the middle?
*March 1, 2011*

**Fractions**

Maria played with her dolls for 45 minutes.this coima also be written as?
*March 1, 2011*

**Measurment**

What is the area of this triangle 22 by 16 by 28 inches inside is 9in?
*February 28, 2011*

**Measurment**

What is the area of this triangle 22 by 16 by 28 inches inside is 9in?
*February 28, 2011*

**Measurment**

What is the area of this triangle 22 by 16 by 28 inches
*February 28, 2011*

**Math**

54.99 17.00
*February 28, 2011*

**A Level Law**

what are sentences for young offenders and what particular aims of sentencing are relevant for young offenders
*February 25, 2011*

**Chemistry**

How much energy is gained by a 40.8g sample of water whose temperature increases from 22 degrees celsius to 35 degrees celsius when left in the sun?
*February 23, 2011*

**A Level Law **

fred has been arrested for murder what are his rights at police station and are they adequatly protected during detention searches and interviews
*February 23, 2011*

**4th grade math**

what is the line segment of 2 7/8?
*February 22, 2011*

**Math**

What is 20x+3=5 what is x. What is 4-x=9 what is x. If you can anser these i have a lot more i`m having problems with please help.
*February 19, 2011*

**algebra**

I don`t know exsactlly the anser but i do think that like you said each letter represents a number i was thinking A=1 B=2 And so on so it would be some thing like that don`t blame me though if you get it wrong i am not sure.
*February 19, 2011*

**Probability**

A coin is tossed 3 times. What is the probability of getting 2 heads and 1 tail?
*February 18, 2011*

**8th Grade Algebra**

Tim and Sasha have a bag containing 7 red marbles, 3 blue marbles, 6 white marbles, and 4 yellow marbles. Tim reaches in, without looking, pulls out a marble, records the color, and then puts the marble back.Sasha then does the same thing. What is the probability that Tim and ...
*February 18, 2011*

**8th Grade Probability**

A box contains 6 red balls, 4 white balls, and 5 green balls. If three balls are drawn in succession without being replaced, what is the probability that they are drawn in the order red, white, green?
*February 14, 2011*

**8th Grade Algebra**

If Julie draws a card from a standard deck of well-shuffled playing cards, what is the probability that he draws either an ace or a heart?
*February 14, 2011*

**8th grade Algebra**

In a drawing for a dvd player, there are 100 tickets in a box.Five of the cards are marked with a star and the rest are marked with an X. To win, Carmen must draw two cards, without replacement, both of which are marked with a star. What is the probability that Carmen will win...
*February 14, 2011*

**chemistry**

Given: hexane- -density at 25 degrees Celsius (.660g/ml) -Vapor pressure of pure substance at 25 degrees Celsius (150 torr) -heat if vaporization (21.0 kj/mol) -55 mL What mass of hexane vaporizes at 25 degrees Celsius?
*February 8, 2011*

**ecology**

Were should I look for info on land and aquatic biomes, if all I want to know is the plats that grow there, and the animals that live there, as well as the annual ammount of rainfall and average temp. without having to do a lot of reading.
*February 8, 2011*

**Literary Analysis**

I need help "translating" this part into more simple english from the poem One Step at a Time by Joseph Morris. Here is the part: "He will stand upon Life's summit and will know that joy sublime which is his alone who dares to prove his soul."
*February 3, 2011*

**8th grade Algebra**

The nearest would be 18. Right?
*January 31, 2011*

**8th grade Algebra**

Marianna's rectangular garden is 15 yards long and 10 yards wide. She wants to stretch a wire for hanging lights from one corner of the garden to the opposite. About how long should the wire be?
*January 31, 2011*

**science**

When you freeze water, 80 calories of heat are released into the surroundings for every gram of water that freezes. This is known as the "latent heat of fusion" of water, which is 80 cal/g. Heat of fusion is a characteristic property. Theoretically, if you could &...
*January 31, 2011*

**8th grade Algebra**

Sharon and her camping group hiked 6 miles due north, stopped for lunch, and then hiked 8 miles due west, stopping at ther campsite for the night. What is the straight line distance from their original starting place to the campsite?
*January 30, 2011*

**Algebra 1**

A rectangular piece of art is 4 meters wide and 6 meters long. It is surrounded by a uniform sidewalk. If the area of the uniform sidewalk is 39 square meters, how wide is the sidewalk
*January 26, 2011*

**11th grade math**

How do you do Absolute Value Functions with graphs?
*January 13, 2011*

**chemistry**

What is the difference between a length on 2 cm and a length of 2.0 cm?
*January 12, 2011*

**math**

what is symmetry
*January 10, 2011*

**3rd grade Math**

what is symmetry
*January 6, 2011*

**related rates problems**

Water pours out of a conical tank of height 10 feet and radius 4 feet at a rate of 10 cubic feet per minute. How fast is the water level changing when it is 5 feet high?
*December 30, 2010*

**related rates calculus problem**

A balloon is being filled with air at a rate of 3 cubic meters per minute. Find the rate at which the radius is changing when the volume is 113.0973355 cubic meters.
*December 30, 2010*

**COMP/160 College**

I need help with writting sentences using three comparatives and superlatives, about personal finance
*December 29, 2010*

**Algebra2**

how to solve a matrice when it's like b21 and it givec you to sets of matrices like AND IT SAYS TO ID EACH ELEMENT A.)O -1 B.)6 -3 1/2 1.5 3 AND 7 -2
*December 29, 2010*

**us history**

Thank you for the start. One last question....what is a philosophical ideal??
*December 26, 2010*