Friday
October 31, 2014

Posts by Emily


Total # Posts: 2,346

chemistry
A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore? Answer in units of g
September 2, 2012

algebra
how do i explain how to write 20 miles/4 hours as a unit rate?
August 30, 2012

ap chemistry
name five organic compounds that melt between -40 degrees and -49 degrees celsius
August 26, 2012

Algebra
Thank You Reiny i see what you did there :) i was confused on some of the things but i understand how to do that stuff now! Thanks Again!, Emily
August 22, 2012

Algebra
BTW!!! I need it explained on like how you figured it out because i have another ? like it and i want to try and do that one on my own!!! THX! ;)
August 22, 2012

Algebra
I need help with this like really badly sooo yeahhhh:) here it is: Hugo withdrew some money from his bank account. He spent one third of the money for gasoline. Then he spent half of what was left for a haircut. He bought lunch for $6.55. When he got home,he had $13.45 left. ...
August 22, 2012

Physics
20/9
August 7, 2012

programming
Given a = 5, b=1, x=10, and y =5, create aprogram that outputs the result of the formula f = (a b)(x y) using a single printf() function. B> Create a program that uses the same formula above to output the result; this time however, prompt the user for the values a, b, x, ...
July 24, 2012

Math
1.) A security code has seven characters. Each code begins with two digits, then two letters, and finally three digits. the number of distinct security codes possible if repetition is allowed? 2.) How many ten digit phone numbers are possible if a number may not begin with a 0...
July 16, 2012

Physics
For part c, it says regarding the common velocity Vf isn't that different than Vcm?
July 10, 2012

Physics
I figured out a and b, but I can't seem to figure out C.
July 10, 2012

Physics
Car 1 has a mass of m1 = 65 103 kg and moves at a velocity of v01 = +0.76 m/s. Car 2, with a mass of m2 = 92 103 kg and a velocity of v02 = +1.5 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine the velocity of their center ...
July 10, 2012

Physics
Two forces, 1 and 2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 58.0 N and F2 = 26.5 N. What is the horizontal acceleration (magnitude and direction) of the block?
June 27, 2012

Physics
The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end...
June 27, 2012

Physics
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 36 m/s (around 80 mi/h) in a time of 5.5 s. The mass of the car and riders is 4900 kg. Find the average net force exerted on the car and riders by the ...
June 26, 2012

Physics
A person with a black belt in karate has a fist that has a mass of 0.70 kg. Starting from rest, this fist attains a velocity of 6.9 m/s in 0.15 s. What is the magnitude of the average net force applied to the fist to achieve this level of performance?
June 26, 2012

Physics
Could someone explain how to do this?
June 22, 2012

Physics!!!
A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...
June 22, 2012

Physics
A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...
June 21, 2012

math
diving 12 and56
June 16, 2012

Geometry
The math club of Ritzy High designed a pennant for the school yacht. The pennant was in the shape of an isosceles triangle. Two points, P and Q, are located so that AC= PQ= QB. Find the measure of angle B.
June 9, 2012

Physics
How are you getting -44 mph for the final velocity?
June 6, 2012

Physics
How fast would a 9-g fly have to be traveling to slow a 1790-kg car traveling at 58 mph by 4 mph if the fly hit the car in a totally inelastic head-on collision?
June 6, 2012

math
create a situation that can be modelled by this linear system, then write a related problem. 10x + 5y = 850 x - y = 10
June 3, 2012

math
26 math words
May 31, 2012

math
26 math words
May 31, 2012

physics
A spherical mirror has a focal length of −0.59 m. An object of height 0.045 m is located 0.42 m in front of the mirror. What is the height (including its sign) of the object’s image?
May 29, 2012

Precalculus
What are the exact values for which tan t = -(sqrt3)
May 23, 2012

chemistry
3CaCO3+2FePO4-->Ca3(PO4)2+Fe2(CO3)3 We start with 100g. of calcium carbonate and 45g. iron (III) phosphate. What is the maximum amount of Ca3(PO4)2 and Fe2(CO3)3 ??
May 14, 2012

Physics
A 1.4 kg mass is attached to a spring with a force constant of 56 N/m. If the mass is released with a speed of 0.26 m/s at a distance of 8.6 cm from the equilibrium position of the spring, what is its speed when it is halfway to the equilibrium position?
May 14, 2012

Chemistry
A bond between two sugar molecules is formed by which of the following types of reactions? oxidation-reduction condensation single-replacement double-replacement
May 10, 2012

Chemistry
What can you say about the energy spread of the radiation emitted by an atomic gas?
May 8, 2012

Chemistry
Based on the spectrum of the fluorescent lamp, what is the main difference between the radiation emitted by a heated solid (filament) and the radiation emitted by an atomic gas (mercury gas in the fluorescent tube)?
May 8, 2012

Chemistry
Thank you SO much!
May 8, 2012

Chemistry
1. Describe the relationship between the color change of the filament with temperature, and the colors in the observed spectrum of white light. 2. Order the colors of the rainbow according to the amount of energy needed to produce them, from lowest to highest.
May 8, 2012

Calc III
Find the position vector of a particle that has the given acceleration and the specified initial velocity and position. a(t)= 56t i + sin(t) j + cos(2t) k v(0)= i r(0)= j I need help finding r(t) Thanks so much for your help!!
May 4, 2012

visual and performing arts
Explain why the Chartres Cathedral both is and isn't an example of the "High Gothic" style. Be sure to reference specific pieces of art in your response.
May 3, 2012

visual and performing arts
well i think its pythagoros or socrates but im not sure.
May 3, 2012

visual and performing arts
From what Greek philosopher did Abbot Suger draw inspiration? .Aristotle .Socrates .Pythagoros .Pseudo-Dyonysius
May 3, 2012

performing and visual arts
im not at all sure about this one.
May 3, 2012

performing and visual arts
What is another name for Gherardo Starnina? .Master of Bambino Vespo .Gentile da Fabriano .Duccio Buoninsegna .Giotto Bondone
May 3, 2012

Chemistry
A 55.0-mg sample of Al(OH)3 is reacted with 0.200M HCl. How many milliters of the acid are needed to neutralize the Al(OH)3.
May 1, 2012

Chemistry
What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?
May 1, 2012

Chemistry
What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?
May 1, 2012

statistics
if the null hypothesis is that the mean is 3218, the alternative hypothesis is that the mean > 3228, and the sample mean is x= 3342, the sample standard deviation is s=287, the sample size is n= 42, and α= 0.01 a. calculate the z test statistic. b. what is the p-value...
April 29, 2012

statistics
do you want to own your won candy store? start up costs (units in 1,000) for a random sample of candy stores are: (95, 173, 129, 95, 75, 94, 116, 100, 85) Use an 80% confidence interval to test the null hypothesis that the mean start up cost is 118. Justify answer.
April 29, 2012

statistics
sorry, the question is above this link
April 29, 2012

book report
can someone show me how a third grade bokreport layout is done
April 28, 2012

Consumer Math
Find the annual amount of FICA at a 7.51% rate by computing his annual salary. Sam Takagi Weekly salary: $435.16 Not self-employed Find the annual amount of FICA by computing his annual salary. $169,938.68 $16,993.87 $1,699.39 2. Find the annual amount of FICA at a 7.51% rate...
April 27, 2012

Chemistry
A sample of ammonium salt (NH4X) having a mass of 1.618g was heated with NaOH and the liberated ammonia was reacted with 50.00 of .6230 mol/L HCl. The excess acid required 1.50 mL of .6115 mol/L NaOH in titration. What is the formula of the salt?
April 25, 2012

College Chemistry
I need help with this question!! a sample of pure KHP weighing .8097g dissolved in water and titrated with 40.25 mL of NaOH solution. The same NaOH solution was used to titrate a solution of a weak diprotic acid H2X. A sample of 0.18694g of the weak acid was first dissolved in...
April 25, 2012

Visual & Performing Arts - Semester 1 Class
unity
April 24, 2012

Visual & Performing Arts - Semester 1 Class
When all the portions of an artwork are combined and seem to function collaboratively, the composition is said to have?
April 24, 2012

us history
Who did the Santa Fe Trail get estblaished for?
April 23, 2012

physics @ elena
I saw that u aready did this, but when I calcuated everything my answers were still wrong
April 22, 2012

physics @ elena
can you please help me with this one At serve, a tennis player aims to hit the ball horizontally. part a)What minimum speed is required for the ball to clear the 0.90m--high net about 15.0m from the server if the ball is "launched" from a height of 2.50m ? part b)...
April 22, 2012

physics
An athlete executing a long jump leaves the ground at a 28.0 angle and lands 7.60m away. part a)What was the takeoff speed? part b) If this speed were increased by just 8.0 % , how much longer would the jump be? i got for part a)9.48 m/s but i need help with part b
April 22, 2012

physics. HELP PLEASE !
An athlete executing a long jump leaves the ground at a 28.0 angle and lands 7.60m away. part a)What was the takeoff speed? part b) If this speed were increased by just 8.0 % , how much longer would the jump be? i got for part a)9.48 m/s but i need help with part b
April 22, 2012

Chemistry
Which pair of compounds will form a solution? A) Benzene (C6H6) and Hexane (C6H14) B) Na2SO4 and Benzene C) NaCl and Hexane
April 20, 2012

Economics
Staples. They are likely to remain fixed, thus having an inelastic supply.
April 19, 2012

Math 10 Linear Equations
I got the same except for the last one. .5x=23 x=46
April 19, 2012

Math 10 Linear Equations
Kevin opened a bank account and plans to deposit $200 each month. Each time he makes a deposit, his parents have agreed to add 50% of the amount the family collects for returning cans and bottles. a) Write an equation that will show his monthly amount when the family collects ...
April 19, 2012

Religion
Youtube - The Maccabeats - Candlelight - Hanukkah Please watch the video above and tell me a piece of Catholic wisdom about a feast day or holiday in the Catholic church. Please please please please
April 14, 2012

algebra2
simplify fourth root sqrt 32x^11y^15/fourth root sqrt 2x^3y^-2
April 14, 2012

cochise
How many kilocal are required to increase the temperature of 15.6 g of iron from 122 °C to 355 °C? The specific heat of iron is 0.450 J/g °C
April 13, 2012

Economics
It's B. Sorry,
April 12, 2012

Economics
it's D.
April 12, 2012

health
Children and adolescents are considered to be reflected in which age group? A. 6-17 years old B. 3-17 years old C. 5-17 years old D. 10-17 years old
April 11, 2012

chemistry
The decomposition of potassium chlorate, KClO3, gives oxygen gas and solid potassium chloride. How many grams of KClO3 are needed to produce 5.00 L of Oxygen gas at STP? Suppose that the reaction described above produces 4.80 L of O2 in the laboratory. What is the percent yield?
April 10, 2012

Physics
in an impulse/ change in momentum problem where mv(final)-mv(initial)=Ft if the initial velocity is zero can i cancel out the masses?
April 10, 2012

Chemistry
how many joules of heat are given off when 5.0 grams of water cool from 75 degrees celsius to 25 degrees celsius? ( specific heat of water = 4.18 jg degrees celsius)
April 9, 2012

Math
write the particular equation of a quartic function that could, according to Descartes Rule of Signs have four positive zeros.
April 9, 2012

physics
You are trying to raise a bicycle wheel of mass m and radius R up over a curb of height h. To do this you apply a horizontal force F. What is the smallest magnitude of the force F that will succeed in raising the wheel onto the curb when the force is applied (a) at the center ...
April 8, 2012

chemistry
How does Le Chatelier's principle explain the result you obtained after the addition of NaOH?
April 7, 2012

healthcare
treat them as if they were someone who is the same age as you.
April 7, 2012

Chemistry
when 0.20 mole HF is dissolved in water to a volume of 1.00 L, 5.8% of the HF dissociates to form F- (aq). What is the equilibrium constant for the reaction ? HF(aq) +H2O(l) ------ F- (aq) +H3O+ (aq)
April 5, 2012

trig
cos(sin^-1 x)=sq rt(1-x^2) prove the identity
April 2, 2012

trig
Give the following for the function: y=2+cos(5x+3.14 Amplitude: Period: Phase Shift:
April 1, 2012

Trig
A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
April 1, 2012

MATH HELP
At Jefferson College 15% of all students participate in athletics. If a class consists of 33 randomly selected students, how many of them would you expect to participate in athletics?
April 1, 2012

Trig
A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.
April 1, 2012

Statistics
At the Starlight Jewelry store, the customer preferences for wedding bands is 60% yellow gold, 29% white gold and 11% platinum. If 15 customers are randomly selected, what is the probability that more than 10 of them choose yellow gold wedding bands?
April 1, 2012

Trig Circular Motion
A es004-1.jpginch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
March 31, 2012

Trig
A ferris wheel at the fair has a radius of 60 feet. If it takes 24 seconds to make a full revolution, what is the linear speed for the passengers?
March 31, 2012

Chem 2
Calculation in grams for a .100 M solution of NaC2H3O2 * 3H2O using a 100 mL volumetric flask?
March 27, 2012

chemistry
51.59 g of water at 82.6 oC is added to a calorimeter that contains 48.01 g of water at 40.9 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.
March 26, 2012

chem
How much energy (in Joules) is required to heat 13.48 g of water from 10.5 oC to 46.2 oC ? Use 4.184 J/goC as the specific heat capacity of water.
March 26, 2012

Physics
A mass of .27 kg is attached to a spring and is set into vibration with a period of .39s.what is the spring?
March 24, 2012

Chemistry
Solid ammonium nitrate can decompose to dinitrogen oxide gas and liquid water. What is delta G at 298K?
March 23, 2012

Math
If threr are a total of 20 students in Bibi's class, how many boys are in the class? How manygirls are in the class?
March 15, 2012

math- Variance
What does it mean when it says Variance of Stride Length with Speed?? Do you add the Variance of both individually together?
March 14, 2012

math
I feel as though I am missing something here...Suppose a family wants to have 3 children. Find the probability that the family has at least 1 boy. Help?
March 13, 2012

math
I feel as though I am missing something here...Suppose a family wants to have 3 children. Find the probability that the family has at least 1 boy. Help?
March 13, 2012

Math
I have the same exact question as this. But I don't understand your way of answering. Can you please help me with this?# of faces painted 3x3x3 4x4x4 5x5x5 4 3 2 1 0
March 10, 2012

Social Studies
Did the Emperor of Qon's efforts to unite China make him an effective ruler? Is the answer very ineffective or very effectve?
March 8, 2012

Math
I forget how do you do this problem? -y < -x-2
March 7, 2012

physics
A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure. The length of the arc ABC is 214 m, and the car completes the turn in 40.0 s (Figure shows coordinate plane with point A on -y axis point C on +x axis and point B ...
March 6, 2012

Calculus I
Show that the equation x^4 + 4x + c = 0 has at most two real roots. I believe we're supposed to prove this by proof of contradiction using Rolle's Theorem, but I'm not quite sure how to do this problem.
March 5, 2012

algebra 2
A pebble is tossed from the top of a cliff. The pebble's height in feet is given by y(t) = -16t2 + 6t + 200, where t is the time in seconds. Its horizontal distance in feet from the base of the cliff is given by d(t) = 5t. How far will the pebble be from the base of the ...
March 5, 2012

Calculus I
Sketch the graph of f by hand and use your sketch to find the absolute and local maximum and minimum values of f. 18. f(x) = 1/x , 1 < x < 3 I can graph it just fine, but for my answer I got that the function has none of the above. Is this correct?
March 5, 2012

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