Tuesday
September 2, 2014

Posts by Anna


Total # Posts: 1,928

physics
If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove?
September 12, 2012

physics
Consider a battery that has Vt = 12.0 V when it is not connected to a circuit. When a 10.0- resistor is connected with the battery, the potential difference across the battery’s terminals drops to 10.9 V. What is the internal resistance of the battery?
September 12, 2012

Science
i dunno....
September 11, 2012

math
the second largest six-digit number in which no digit appears more than three times
September 9, 2012

science
Lithium fluoride has a Ksp of 1.84 x 10-3. If 1.5 g are dissolved, what will be the percent ionization?
September 7, 2012

chemistry
if 14.7g of na reacts with 7.9g og br how many grams of nabr are found
September 3, 2012

Physics
An object is thrown upwards at an initial speed of 19.6 m/s from a height of 65m. Determine how long will take for the object to reach the ground (time of flight). what formula should i use?
August 29, 2012

Math
When dealing with linear equations, what does consistent, inconsistent, dependent, and independent mean? I'm so confused!
August 23, 2012

math
shoshanna is going to use 12 base ten blocks to model the largest possible number less than 999.Then she will use another 12 blocks to model the smallest possible number less than 999.what are the 2 numbers?
August 20, 2012

math
trying to solve fraction problem 2/3+3m/5=31/15 been too long....
August 18, 2012

Physics
Car A is moving at a constant speed of 10.0 m/s and passes Car B which is at rest. 10 seconds after, the latter follows with an acceleration of 0.5 m/s2. Determine the distance that the latter has to travel before it overtakes the former. does it require quadratic formula? Oh ...
August 12, 2012

Chemistry
What will happen when 100 ml of diethyl ether are added to 100 ml of water and thoroughly mixed? a.) Water will form a separate layer on top of the ether layer. b.)The temperature of the mixture will significantly increase. c.)There will be a chemical reaction between ether ...
August 12, 2012

chemistry
Suppose a student started with 135 mg of trans-cinnamic acid and 0.52 mL of a 10% (v/v) bromime solution, and after the reaction and workup, ended up with 0.202 g of brominated product. Calculate the student's theoretical and percent yields.
August 12, 2012

math
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22 @MathMate
August 11, 2012

math
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22
August 11, 2012

Math
I have this question for summer homework: "Mary's quiz scores were 92, 85, 78, 71, 77, and 80. She says she had an average of 92 for her quiz scores. Which term best describes her average score? a. mean b. median c. mode d. range" I calculated the mean, and it ...
July 26, 2012

Algebra*
Short Answer. Find the following quotient: x^2-36/x+6
July 26, 2012

Algebra*
Short Answer. Find the following product: (x+7)^2
July 26, 2012

Algebra*
Short Answer. Find the following product: -3z(-z^2-9)
July 26, 2012

chemistry
SciMann Best Answer - Chosen by Voters Let UNITs guide you; always USE THEM in your calculation to prevent errors moles of Na in samp = 0.78 g/ atwt Na = ?? x moles NaBr * MW NaBr + (moles Na - x moles NaBr) * MW NaCl = 2.01 g x moles NaBr = [2.01 g - moles Na * MW NaCl] / [MW...
July 26, 2012

algebra*
Find the following product: -9x^5y(-5x^4y^6) A)-14x^9y^7 B)45x^9y^7 C)-9x^5y-5x^4y^6 D)45x^20y^6
July 26, 2012

Algebra
Divide and check: (3x^2-2x-13)divided by (x-2)
July 24, 2012

algebra
Lunc Capacity: The polynomial 0.041h-0.018A-2.69 can be used to estimate the lung capacity, in liters of a female find the lung capacity of a 40-year old woman who is 165 cm tall.
July 24, 2012

algebra*
Multiply (x^10+3)(x^10-3)
July 24, 2012

algebra
Short Answer. Add the following polynomials. (4x^2-3x+2)+(5x^3-7x^2-9)
July 21, 2012

algebra
Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...
July 21, 2012

algebra
find a polynomial for the shaded area of each figure. (21t+8)(4t)-(3t-4)(2t) I did this problem incorrectly!
July 21, 2012

algebra
Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...
July 20, 2012

Statistics
Find the probability of at least one match. n = 62 How do I figure out r?
July 6, 2012

Physics
I'm having trouble following this. How do you go from: GM/4R - GM/R = -GM/(R + h) to 3/4R = 1/(R+h) to h=R/3?
June 28, 2012

Physics
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. (b) If an object is fired directly ...
June 28, 2012

calculus
(SIN^8X-5 SIN^5X+SINX)COSX DX I need the answer to this, because I have tried so many times and cannot figure it out.
June 28, 2012

Physics
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
June 26, 2012

College Essay
Thanks! I will try to elaborate more why this experience is special to me in my conclusion...
June 18, 2012

College Essay
Well one of the options for the Common App is to: Evaluate a significant experience, achievement, risk you have taken, or ethical dilemma you have faced and its impact on you. So do you think this would be acceptable as my "significant experience", or is it too strange?
June 18, 2012

College Essay
One seemingly normal day in junior year, my friend and I were taking a train together home from school. We were on an extremely crowded F train headed for Queens. Packed against the door that separated one train car from another, overly warm and squished with no pole nearby to...
June 18, 2012

physics
I would tell you the steps I've taken so far but I have no idea where to even start. Any help is appreciated! Thanks! A uniform 33.5-kg beam of length = 4.15 m is supported by a vertical rope located d = 1.20 m from its left end as in the figure below. The right end of the...
June 16, 2012

Neoclassicism I english 11
yeah i need the answers too.
June 16, 2012

Accounting
I need help in working this problem...please help... Gaines Company recently initiated a post audit program. To motivate employees to take the program seriously, Gaines established a bonus program.Managers receive a bonus equal to 10 percent of the amount by which actual net ...
June 14, 2012

Accounting
I am trying to figure out how to do this problem: scenarios (projected $90,000 annual cash inflow vs. projected $70,000 annual cash inflow). Note, 5 years of $90,000 per year equals $450,000 of total cash received over the duration of the project ($350,000 for 2nd project). ...
June 14, 2012

math
The answer is 16 because when you use FIOL for (5x-4)(5x-4) you get 25x^2 -20x-20x+16.Then you simplify to 25x^2-40x+16 to your original problem with the answer of 16 in the problem. FIOL is multiplying... the FIRST term then INNER terms then OUTER terms finally your LAST terms.
June 6, 2012

physics
If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.
June 4, 2012

physics
If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.
June 4, 2012

Calc
Oh, I forgot all about L'Hospital's Rule. Thanks!
May 25, 2012

Calc
Find the limit as x approaches zero from the right of ((sqrt((1+x)/(x^2))-(1/x)) I don't even know where to start with this. Help? P.S. If you go to the wolfphram alpha website and put copy and paste ((sqrt((1+x)/(x^2))-(1/x)) into the search bar you can see what it looks ...
May 25, 2012

Maths B
Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
May 24, 2012

Year 11 English
thanks alot!!!
May 24, 2012

Year 11 English
Imagine you are the director of Rabbit-Proof Fence. Using what you have learned so far, how would you instruct the camera operator to help you communicate: a) how the girls are feeling during their walk home? b) how vast and empty the landscape is within the same scene? (1 ...
May 24, 2012

chemistry HELP plz!
The answer is b. 31P
May 24, 2012

Maths B
i don't get what you mean. Can you please explain it to me again.
May 24, 2012

Maths B
Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
May 24, 2012

Maths B
Work out the 5 number summary Min=3 Q1=6 Median=8 Q3=14.5 Max= 24 IQR=Q3-Q1 =14.5 - 6 =8.5 Work out if 24 is an outlier or not. x-Q3>1.5*IQR 24-14.5>1.5*8.5 9.5>12.75 24 is an outlier
May 24, 2012

Year 11 Maths B
So does that mean n1=35 n2=8 m1=1715 m2=424 Total bag count: 43 Total Mass: 2139 New mean mass: 49.74418605 Round it to the nearest kilo 50kg. Is that correct???
May 24, 2012

Geometry
The volume of an oblique cone with equal diameter and height is 18pi cm^3. Find the height and radius(to the nearest cm).
May 21, 2012

Physics
A wave on a string is described by the following equation (assume the +x direction is to the right). y = (18 cm) cos[ðx/(5.3 cm) - ð t/(14 s)] What is its period? What is its speed? In which direction does the wave travel? To the left or to the right?
May 20, 2012

dosing
thank u
May 17, 2012

dosing
1 tbsp= 15 ml 1 fl.oz = 30 ml And then how many dose will be obtained in 12 fl.oz?
May 17, 2012

dosing
if 1 tablespoon is prescribed as a dose of medicine,approximately how many doses will be obtained in 12 fl.oz?
May 17, 2012

Math Problem ( 6th grade math)
Brandon tosses a coin 500 times. The coin lands on tails 320 times. A: What is the experamental probability of getting heads? B: Is the coin fair or unfair? Explain you answer.
May 16, 2012

Math!!
Eric bowls 35 times and gets 15 strikes. Fine the experimental probability that eric will bowl a strike. The answer first. Then explain what you did to get the answer
May 16, 2012

math
If d is the distance, and r is the radius of the earth (in feet), r^2 + d^2 = (r+32000)^2
May 16, 2012

Geometry
Given circle E with diameter AC and m<DAC=62 degrees, find mAD(arc).
May 16, 2012

Math
Anybody there???
May 15, 2012

Math
Also, Explain in words how you determined the probability of the player making the free throw.
May 15, 2012

Math
Thank You So Much Ms. Sue! Are you a teacher?
May 15, 2012

Math
So 1/3 would be the probability that the player makes the free throw?
May 15, 2012

Math
Well A player makes 4 of 12 free throws. Question: What is the Probability that the player makes the free throw?
May 15, 2012

reading
Did you read the story?
May 15, 2012

6 grade math
Yes. Im in 6th grade also and i did intergers last month and yes you are correct! Good Job
May 15, 2012

science
When a Gila monster uses a rock for shade from the noonday sun, it is interacting with _____. (1 point) an abiotic factor another organism an ecosystem its community
May 15, 2012

Pre-Calc
How would you prove this identity? (sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)
May 10, 2012

Medical Terminology
I have to write a fictitious medical report containing this weeks vocab. It has to be at least 2 paragraphs describing a dermatologic condition or disease and contain all of the vocabulary and their definitions. My question is...how do I format this? If someone could give me ...
May 7, 2012

Biology
Another brain teaser I can't get: What are Mr. Rahn's favorite states" Hint: "it matters"
May 1, 2012

Biology
I can't figure out these brain teasers: i.e.point act char er ILL GET IT
May 1, 2012

Calculus
I'm supposed to find the average value of the function over the given interval. f(x) = sin(nx), interval from 0 to pi/n, where n is a positive integer. I know the average value formula, and I know that the integral of that function would be (-1/n)cos(nx), but I keep ...
April 27, 2012

Geography
What is the easternmost nation of southern Europe?
April 27, 2012

math
what is the unit rates for a store that had 30 customers in 12 min.
April 25, 2012

Chemistry
A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?
April 23, 2012

AP Chem
okay so i think i did this question correct but i get a little confused with equivalence point. If there is 25 ml of a .300M solution of HNO2...when i set up my ICF table, does that mean there is 7.5 mmol of HNO2 and OH- in the equation HN02 + 0H --> NO2 + H20 since it is ...
April 23, 2012

AP Chem
Consider 25.0 ml of .300 MHNO2 that is titrated with .500 M Find ph at eq pt
April 23, 2012

AP Chem
1.513g of monoprotic acid (HX) is dissolved in water, and the volume is 250.0 ml after the dissolving. The solution was then titrated 38.12g of .100 M NaOH to reach the end point of the titration. What is the molecular weight of HX?
April 23, 2012

chemistry
what are metals and non metals that are found in the human body and their function?
April 21, 2012

chemistry
what are the applications of the silicon atom with its isotopes of 28,29,and 30?
April 19, 2012

chemistry
give at least 3 atoms with its isotopes and its application?
April 19, 2012

Chemistry
What mass of Helium will occupy 2 times the volume of 10.0 grams of Neon if both gases are measured at STP?
April 18, 2012

Chemistry
A gas mixture contains 4.00 grams of O2 and 4.00 grams of He. If the total pressure of the gas sample is 4.67 atm, what is the partial pressure of each component?
April 18, 2012

Algebra 2
You would divide everything by 3 leaving you with f-1(x)= x/3 - 4
April 18, 2012

Analytical Chemistry
How many millimoles and molecules of solute are in 500 ml of a solution that is 5.41 ppm KMnO4?
April 18, 2012

math
A hypothesis test is conducted with respect to the mean weight (in ounces) of potato chip bags form a certain manufacturer. The hypotheses are: H0:  = 0.8 and Ha:  ≠ 0.8. Which confidence level would support the conclusion that there is insufficient ...
April 17, 2012

math
two negatives make a positive
April 17, 2012

math
12
April 17, 2012

math
36
April 17, 2012

chemistry
55.85 g/mol
April 17, 2012

statistics
The power of a significance test for a particular value of the parameter is computed to be 0.93. Which statement below is true? a) The probability of committing a Type I error is 0.07. b) The probability of committing a Type I error is 0.93. c) The probability of committing a ...
April 17, 2012

statistics
An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of is approximately normal. b) When n increases...
April 17, 2012

Physics
A metal plate has a charge density of 85uc/cm^2 : Calculate the electric field strength at 14 cm above the plate
April 17, 2012

chemistry
Is it okay taking caffeine then ascorbic acid?
April 17, 2012

child day care
You’ve decided to operate a day care home. Which one of the following factors is the most important in helping you make your decision? A. Your family is willing to share their living space with the children in the program. B. Your home seems to be large enough. C. You ...
April 13, 2012

Physics
Find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air.
April 13, 2012

Chemistry- intermolecular forces
When a benzoate ion goes through solvation, what is the intermolecular force involved? Is is hydrogen bonding?
April 12, 2012

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