Wednesday
November 26, 2014

Posts by Liz


Total # Posts: 1,182

math
A tank holds 15 litres of water.A cup holds 3/10 of a litre. How many cups of water does the tank hold
November 18, 2014

art/photography
1. In sandy skoglunds THE COCKTAIL PARTY what was the artist contrasting? 2. What did the artist say about her work? 3. What does the artist deal with in all of her illustrations? 4. What happens to sandy skoglunds installations pieces and what become of the work of art? 5. ...
November 9, 2014

Physics
A 24.00 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=0.3500 m, then lets it go. The mass undergoes simple harmonic motion ...
November 8, 2014

Algebra please help
A grocery store sells snacks by weight. A six ounce bag of mixed nuts costs $3.60. Predict the cost of a two ounce bag. Please help answer
November 4, 2014

Algebra please help answer
Gina's art teacher mixes 9 pints of yellow paint with 6 pints of blue paint to create green paint. Gina mixes 4 pints of yellow paint with 3 pints of blue paint. Did Gina use the same ratio of yellow paint to blue paint instructed by her teacher? Explain. Is it 9/6 to 4/3...
November 4, 2014

English
Which of the following stylistic movement best represents Weird Al Yankovic's song Canadian Idiot? Would it be existentialism, modernism or postmodernism and why?
November 3, 2014

finamce
Define captital structure weights)Templeton extended care facilities, inc., is considering the acquisition of a chain of cemeteries for $400 million. Since the primary asset of this business is real estate, Templetons management has determined that they will be able to borrow ...
November 2, 2014

Math
On December 16, 1811, an earthquake occurred near New Madrid, Missouri, that temporarily reversed the course of the Mississippi River. The quake had a magnitude of 8.8. On October 17, 1989, a calamitous quake measuring 7.1 on the Richter scale occurred in San Francisco during ...
October 31, 2014

Algebra please help out
Would part B be 180/252, and would part C be 252/10? Please let us know if correct thx
October 29, 2014

Algebra please help out
Tomas makes balloons sculptures at a circus. In 180 minutes, he uses 252 balloons to make 36 identical balloon sculptures. Part A question how many minutes does it take to mAke one balloon sculpture? How many balloons are used in one sculpture? b. What is Toma's unit rate ...
October 29, 2014

Algebra please help out
Ed is using the recipe shown to make fruit salad. He wants to use 30 diced strawberries in his fruit salad. How many bananas, apples, and pears should Ed use in his fruit salad? The fruit salad recipe reads 4 bananas, diced, 3 apples diced, 6 pears diced and 10 strawberries ...
October 29, 2014

Math
If an object is propelled upward from ground level with initial velocity of 55 feet per second, it's height h in feet t seconds later is given by the equation H=-16t^2+55t. after how many seconds does the object hit ground?
October 28, 2014

calculus
Find the length and width of a rectangle that has the given area and a minimum perimeter. Area: 8A square centimeters
October 26, 2014

COLLEGE PHYSICS
An internal explosion breaks an object, initially at rest, into two pieces. One piece (m1) is 1.5 times more massive than the other (m2). If 7500 J were released by the explosion, how much KE did each piece acquire?
October 22, 2014

Physics
A rescue plane is flying horizontally at a height of 132 m above the ground. The pilot spots a survivor and releases an emergency kit with a parachute. The kit descends at a constant vertical acceleration of and the initial plane horizontal speed is . Assuming air resistance ...
October 22, 2014

math
The number 199,557 contains two sets of digits in which one digit is ten times as great as the other. What are the values of the digits in each set?
October 15, 2014

English
I have to write a 5 paragraph comparison and contrast essay on Agamemnon, Hamlet, and The Love song of J. Alfred Prufrock. When writing this, do I compare all three stories at once in each paragraph as well as their differences in each of the 3 body paragraphs?
October 11, 2014

Math & Statistics
Problem 6 [Total 5 marks] The drug Ziac is used to treat hypertension. In a large clinical trial it was found that 32% of those in the placebo group experienced dizziness. (a) [1 mark] Assuming that the same 32% proportion applies to subjects taking the drug, find the ...
October 8, 2014

science
An electron drop to what energy level is likely to emit a photon in the infrared region?
October 4, 2014

Trigonometry
A communications tower is located at the top of a steep hill, as shown. The angle of inclination of the hill is 58°. A guy wire is to be attached to the top of the tower and to the ground, 50 m downhill from the base of the tower. The angle α in the figure is ...
October 1, 2014

Math
List these numbers from least to greatest 7/3, 3/4, 2/3, 0.5, 1.3
October 1, 2014

algebra
the area of a rectangular picture frame is 30 1/3 square inches. the length of the frame is 6 1/2 inches.please help find the width of the frame. thanks
September 29, 2014

algebra
Dao has 2 3/8 pounds of hamburger meat. he is making 1/4 pound hamburgers. does Dao have enough meat to make 10 hamburgers? explain. thanks
September 29, 2014

algebra
Jeremy has 4 1/2 cups of iced tea. He wants to divide the tea into 3/4 cup servings. use the model to find the number of servings he can make. Please help answer question. thanks would it be 9/2 multiplied by 4/3
September 29, 2014

math-pre calc
On a drive from your home to town, you wish to average 48 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you find you have averaged only 36 mph. What average speed must you maintain in the remaining distance in order to have an overall ...
September 24, 2014

chemistry
It's supposed to be "c" of liquid ,I'm sorry.
September 23, 2014

chemistry
A 50g chunk of metal (c=0.0506 j/g°C) is heated to 60°C. it is then dropped into a calorimeter(c=1.40 j/g°C,m=5.0 g)that contains 100.0g of an unknown liquid. the temperature of the liquid raises from 15°C to 20°C.What is the c of the calorimeter?
September 23, 2014

physics
2.91s
September 16, 2014

algebra 1
a number and its absolute value are equal.if you substract 2 from the number, the new number and its absolute value are not equal. what do you know about the number? what is a possible number that satisfies these conditions? Can you help answer these 2 questions? thanks
September 10, 2014

algebra 1
the deepest point in elevation in the indian ocean is the java trench, which is 25,344 feet below sea level. elevations below sea level are represented by negative numbers. can you help write the elevation of the Java Trench? also, a mile is 5,280 feet. Between which two ...
September 10, 2014

algebra
two students are playing a math game. the object of the game is to make the least possible number by arranging the given digits inside absolute value bars on a card. In the first round, each player will use the digits 3, 5, and 7 to fill in the card. One student arranges the ...
September 10, 2014

Algebra
If the absolute value of a negative number is 2.78, what is the distance on the number line between the number and its absolute value? can you help explain the answer. thanks
September 10, 2014

Chemistry
sorry I forgot to add the rest. I also have the concentration of NaOH which is 1.0 M, pKa is 4.4, and the volume of the acid is 25 mL
August 17, 2014

Chemistry
How would I find the concentration of an unknown acid if I have a Ka value of 3.98x10^-5?
August 17, 2014

calculus
A parallelogram is determined by the vectors a = [-2, 5] and b = [3, 2]. Determine the diagonals of the parallelogram.
August 16, 2014

calculus
Solved
August 16, 2014

calculus
Beth leaves a dock in a motorboat travelling at 14 m/s. She heads downstream at an angle of 40° to the current, which flows at 6 m/s. Determine how long it takes for Beth to travel 400 m
August 16, 2014

SOLVED
SOLVED
August 16, 2014

calculus
For the vectors x=(0,6,-5), y=(2,1,4) and z=(-2,3,-1) what is the value of (2x+y)·(3y-z)? (dot product question and each letter is a vector)
August 16, 2014

calculus
Nikki is driving a motorboat across a river that flows at 5 m/s. The motorboat has a speed of 12 m/s in still water. She heads out from one bank in a direction perpendicular to the current. How far does she travel in 3 minutes?
August 16, 2014

calculus
Determine (6i+2j)· (i-4j+k) This is a dot product question and each letter has the vector symbol
August 16, 2014

Calculus (need help with only d and e)
Codeine phosphate is a drug used as a painkiller. A common brand contains 30 mg of codeine. Samples of blood were taken at regular time intervals from a patient who had taken a pill containing 30 mg of codeine. The amount of codeine in the bloodstream was determined every 30 ...
August 13, 2014

Chemistry
I am given that volume of an unknown acid is 25 mL, volume of NaOH is 13 mL and concentration of NaOH is 1.0 M. I have a graph of a titration curve where the equivalence point is pH=9 (pH on y axis and volume of NaOH on x axis) How would i find the pKa value as well as the Ka ...
August 13, 2014

Chemistry
Ièm studying grade 12 chemistry and this is the Chemical Systems and Equilibrium
August 8, 2014

Chemistry
Thanks but not exactly, the question is asking what would happen if you had more than one product or reactant that was a gas
August 8, 2014

Chemistry
Can you please explain if it would be possible to calculate the K value if more than one product or reactant in a chemical equation is a gas?
August 8, 2014

Chemistry
I am to do an equilibrium constant lab and I am supposed to only find the Kc value. i have to find the equilibrium constant for NaHCO3 (s) <--> NaOH (s) + CO2 (g) at 800K. The partial pressure in the bulb reads 420 kPa on the manometer, 1 gram of NaHCO3 was added to the ...
August 7, 2014

physics
An astronaut in a spaceship is listening to his music. Calculate the time it takes to play a 4.00 minute song at 0.1c
August 4, 2014

physics
I need help with this question. Would you be able to explain it please? Double slit interference patterns exhibit mλ path difference for constructive interference. Single slit diffraction patterns exhibit (m+1/2)λ path difference for constructive interference. With ...
August 4, 2014

physics
Can you please explain how to solve this question? Would I need to use the formula nλ=dsin(theta)? Red light with a wavelength of 660 nm and blue light with a wavelength of 480 nm are beamed at a double slit with a separation of 2x10^-3 mm. The third order maximums for ...
August 2, 2014

Chemistry- practice question
The answer for this question is ΔHrxn=-441.40174468085 kJ/mol but I don't know how to arrive to that answer. 0.47g of magnesium reacts with 100ml of 1.00 mol/L HCl in the following reaction: Mg(s)+2HCl(aq)-->MgCl2(aq)+H2(g). The heat of reaction is -8537.4J ...
August 1, 2014

physics
At exactly the critical angle: a) all light reflects back into the n1 medium b) all light reflects back into the n2 medium c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums d) part of the light reflects back...
August 1, 2014

Physics- check answer please
A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water Would the answer be a)?
August 1, 2014

nursing
In what ways does the World Health Organization assist healthcare?
August 1, 2014

physics
At exactly the critical angle: a) all light reflects back into the n1 medium b) all light reflects back into the n2 medium c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums d) part of the light reflects back...
July 31, 2014

Physics- check answer please
Would the answer be b)? diamond into air? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water
July 31, 2014

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the answer be a?
July 31, 2014

physics
How would I figure out the answer to this question? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water
July 31, 2014

Physics- check answer please
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the answer be a?
July 30, 2014

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above
July 30, 2014

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above
July 29, 2014

Physics -- check answer please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
July 29, 2014

Physics -- check answers please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
July 28, 2014

physics
1. If the period of a wave is 0.27s, how many waves would pass by in 1.0 minute? 2. When a wave from of light passes through an opening that's large compared to its wavelength, it: a) behaves as a single new point source b) produces a straight wave front, curved backwards ...
July 28, 2014

Physics -- check answer please
Refraction is: a) the way light behaves when it goes through a narrow opening b)the way teo light sources interact to produce interference patterns c) the absorption of one component of the electric field d) none of the above are correct my answer: d
July 28, 2014

Physics -- check answers please
1. If 31 waves pass by a point in 1.7 s, what's the frequency? my answer: 18.2 Hz 2. if a crest with an amplitude of 7cm interferes with a trough with an amplitude of 10 cm, the resulting wave has an amplitude of: my answer: -3
July 28, 2014

statistics
A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?
July 28, 2014

physics
Red light with a wavelength of 660 nm and blue light with a wavelength of 480 nm are beamed at a double slit with a separation of 2x10^-3 mm. The third order maximums for the different colours occur at different spots. What is the angle between the second order maximums?
July 27, 2014

Chemistry
Why would you subtract the heat of a calorimeter when calculating heat of the reaction? hint: the heat of the calorimeter is the amount of heat that the calorimeter absorbs from the solution-each calorimeter will absorb a certain amount of heat, which means that the ...
July 27, 2014

chemistry check answer
Question: Explain whether using solid NaOH pellets rather than aqueous NaOH would alter the enthalpy. If different, would it be higher or lower My answer: Would the result be different since the aqueous NaOH would be able to quickly dissolve in water unlike solid NaOH which ...
July 27, 2014

physics
Fill in blank: Two slits can produce an interference pattern with visible light but this maximal point of constructive interference can be made more pronounced by using many fine lines in a __________
July 27, 2014

physics
Fill in blank Increasing the distance between a pair of slits through which light is being shone would ___ the distance between nodal lines appearing on a screen
July 27, 2014

wavelength
A human's wavelength is similar to the size of: a) a cell b) atom c) nucleus d) proton e) something else and why?
July 26, 2014

Physics
I am to fill in the blanks without a word bank, my answers are in brackets. 1. When light waves reflect from media in which the speed of light is slower, their phase (crest or trough) is ____ 2. The trick to being able to observe interference patterns for light waves in to ...
July 26, 2014

Physics -- check answers please
I am to fill in the blanks without a word bank, my answers are in brackets. 1. A ____ diffraction pattern is unique because it has a larger central maximum. (single slit) 2. the brightest, clearest diffraction pattern is created with a _____ (barrier)
July 26, 2014

Physics
The following figure represents the ride for a cart with a mass of 200 kg along a frictionless track. a. Calculate the velocity of the cart at points A, B, and C if the cart is dropped from a height of 100m with a initial velocity of 10 m/s. b. Calculate the height of the ...
July 25, 2014

Chemistry
I think that the question is saying why you do subtraction in the equation Qrxn=-Qcal-Qsoln
July 22, 2014

Chemistry
Why would you subtract the heat capacity of the calorimeter when calculating the heat of the reaction?
July 22, 2014

Chemistry
For the equation q=cΔt, q=100KJ, initial temp=20 degrees celsius, final temp=31.4 degrees celsius and I need to find c. Do I need to convert the q value from KJ to J?
July 22, 2014

physics
Fill in blank without a word bank (unit is wave nature of light) 1. As water waves travels through a slit barrier, they bend and spread out. This is known as ______ 2. Two identical waves will interfere destructively, cancelling one another out, when one lags behind the other ...
July 21, 2014

Chemistry
For an enthalpy lab, why would calculated value differ from the theoretical value (in percent error) for the heat reaction of Mg/HCl and MgO/HCl
July 21, 2014

SOLVED
I figured out this question
July 21, 2014

Chemistry
Find the enthalpy of combustion of magnesium using Hess' law given the following data (assume that exactly 100.0 mL of HCl was used in each trial and that HCl is in excess) Magnesium/HCl reaction: Grams of Mg= 0.244g Initial temp= 32.2 degrees celsius Final temp= 21.3 ...
July 21, 2014

Chemistry
No, the question only says Mg
July 21, 2014

Chemistry
why can't the enthalpy of magnesium be measured using a coffee cup calorimeter?
July 21, 2014

chemistry
It is ok to have a negative percent error? I got a negative value for the percent error of the enthalpy of the formation of methane gas
July 20, 2014

Chemistry
The combustion reaction of Mg +1/2 O2-->MgO produces a very bright white flame and high heat. Verify that the following reactions produce the same overall reaction: a) MgO+2HCl-->MgCl2+H2O b) Mg+2HCl-->MgCl2+H2 c) H2+1/2O2-->H2O ΔH°= -285.8 KJ/mol
July 20, 2014

Chemistry
I am to use this formula to find ΔH°f,methane: ΔH°comb=2ΔH°f,water+ΔH°f, carbon dioxide-ΔH°f,methane-2ΔH°f,oxygen For ΔH°comb, the value is 884 KJ/mol For ΔH°f,water, the value is -285.8 For ΔH°f,...
July 20, 2014

Chemistry
ok I got it now!
July 20, 2014

Chemistry
Ok thanks! I used PV=nRT to calculate the mols but I got a larger number. Here's what I did: P= 1.000 atm V= 0.271 L R= 0.08206 Latm/molK T= 2.3 K and I got 1.436 as my answer
July 20, 2014

Chemistry
A calorimeter is filled with 10.0 millimole (mmole) of methane gas and an excess of oxygen. When burned, the ignition wire releases 140.77 J of heat. The heat capacity of the calorimeter is 4.319 KJ°C-1. qwire= 140.77 J Calculate ΔHcomb. Recall that ideal gas law is ...
July 20, 2014

Chemistry
Ok I understand it now! Thank you so much!
July 19, 2014

Chemistry
Oh so answer would be 907 J/mol? also for the thermochemical equation you said it would be CH4 + 2O2 ==> CO2 + 2H2O with ΔH=- 890 kJ/mol but I don't know how to calculate that value
July 19, 2014

Chemistry
I have previously posted this question, but now I am lost question: A calorimeter is filled with 10.0 millimole (mmole) of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The heat capacity of the calorimeter (including the bomb and...
July 19, 2014

Chemistry
I got 0.907 KJ for ΔHcomb but I don't know if its correct. I also don't know how to write the equation. -------- question: A calorimeter is filled with 10.0 mole of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The ...
July 16, 2014

Chemistry
Yes the initial temperature is 24.75 degrees celsius and the final temperature is 26.85 degrees celsius
July 16, 2014

Chemistry
I got 0.907 KJ for ΔHcomb but I don't know if its correct. I also don't know how to write the equation. -------- question: A calorimeter is filled with 10.0 mole of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The ...
July 16, 2014

Unified field theory
Einstein sought to discover a unified field theory that would explain the behaviour of all fields. What evidence have you seen to suggest that such a theory exists? Is there anything to suggest that it doesn't?
July 15, 2014

physics
A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...
July 15, 2014

physics
A charge with a value of 3.0 x 10^-5 C is located 3.0 cm from a charge with a value of 6.0 x 10^-5 C. Determine the distance from the larger charge to the point where the total electric field is zero
July 15, 2014

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