Thursday
October 30, 2014

Posts by Allie


Total # Posts: 257

Algebra-Please check
For the ellipse (x-2)^2/49 + (y+1)^2/25=1 List center: (2,-1) the foci: -(sqrt 74) AND +(SQRT 74,0) Major axis: x=2 Minor axis: y= -1 Vertices: (7,0) (-7,0) (0,5) (0,-5) Is this correct?
November 1, 2011

Physics
A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water? I need to find the magnitude in N Thank you!
October 27, 2011

Physics
(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 23.2 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa. Pa (b) What force is exerted by the water on the window of an underwater vehicle at ...
October 27, 2011

physics
Four objects are held in position at the corners of a rectangle by light rods . m1 2.90(kg) m2 1.90(kg) m3 4.50(kg) m41.90 (kg) (a) Find the moment of inertia of the system about the x-axis. Answer in kg · m2 (b) Find the moment of inertia of the system about the y-axis...
October 26, 2011

Economics
can you help me brain storm? I want some points on why Per Capita GDP might be a bad way to compare wellbeing across countries.
October 23, 2011

history
I don't understand what is meant when a question asks you for the "term" Historical significance. for example:john maynard keynes. I know everything about him and his economic ideas but, if i was asked to write a short paragraph of his historical significance i ...
October 22, 2011

critical thinking
technical jargon used by people in the same field can be an acceptable used of language. true of false.
October 22, 2011

Physics*
A student sits on a rotating stool holding two 3.2-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and...
October 20, 2011

Physics*
A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 575 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5,000 rev/min. (a) Find the kinetic ...
October 20, 2011

Physics*
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 70.0-gram mass is attached at the 16.0-cm mark, the fulcrum must be moved to the 39.2-cm mark for balance. What is the mass of the meter stick? Answer in grams
October 20, 2011

social studies
name two helpful developments in georgia and the rest of the country that occurred after the Revolutionary War
October 20, 2011

Physics
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.70 m and 0.99 m, respectively. The respective rotational speeds are 454 rev/min and 4,147 rev/min. Calculate the speeds of the tips of both rotors. main rotor =180.6625215m/s tail rotor ______m/...
October 10, 2011

Physics
A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.1x10^4 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. rad
October 7, 2011

Physics
A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 7.0-kg object at the origin of the coordinate system, a 8.0-kg object at (0, 2.0), and a 17.0-kg object at (4.0, 0). Find the resultant ...
October 6, 2011

Physics
A satellite has a mass of 99 kg and is located at 1.97 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? Answer in J (b) What is the magnitude of the gravitational force on the satellite? Answer in N
October 6, 2011

Physics
A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10−16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10−11 N. At how many revolutions per second should the centrifuge be ...
October 6, 2011

Physics
A 54.9-kg ice skater is moving at 4.09 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.803 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. Answer in N (b) ...
October 6, 2011

Physics
A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. rad
October 6, 2011

critical thinking (just explain the question plz)
can u explain this question for me or rephrase it because i dont understand what it means by fact-based subject matter or value-based subject matter. Does your hypothesis test fact-based subject matter or value-based subject matter? Briefly explain.?
October 5, 2011

Physics
A 2.4 kg object attached to a horizontal string moves with constant speed in a circle of radius R on a frictionless horizontal surface. The kinetic energy of the object is 95 J and the tension in the string is 315 N. Find R.
October 4, 2011

Physics
A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by a 93.0-kg opponent running north with a speed of 3.00 m/s. (a) Why does the tackle constitute a perfectly inelastic collision? (b) Calculate the velocity of the players immediately after the tackle. ...
October 4, 2011

Physics
Question Part Points Submissions Used A 45.0-kg girl is standing on a 160-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.44 m/s to the right...
October 4, 2011

Physics
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average force on the ...
October 4, 2011

Physics
A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0037 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 2.7 102 ft/s, find the average force ...
October 4, 2011

critical thinking please help
True or false: It is the case that if an argument is inductively correct then the conclusion is factually correct as well
October 4, 2011

cell bio
Sketch a transition phase diagram with two curves; one for C18:0 and a second for C18.1. Label X and Y. Add a third curve for what you might predict would happen if a nonionic detergent like Triton X-100 were present in the C18:0 preparation
October 2, 2011

cell bio
NTP hydrolysis is used in two ways to drive directionality of the targeting and translocation phases of secretion. What are the principles of these two mechanisms?
October 2, 2011

Calculus
f'= 2x+5 F'(1) is 7
October 2, 2011

Chemistry
I'm adding NaOH
September 29, 2011

Chemistry
Calculate the volume of 2 M acetic acid needed to prepare 50 ml of 0.1 M acetate buffer.
September 29, 2011

Physics
When a 3.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.07 cm. (a) What is the force constant of the spring? N/m (b) If the 3.00-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on ...
September 27, 2011

economics please help
Use the supply and demand model to explain what happens to the equilibrium price and the equilibrium quantity for frozen yogurt in the following cases. d.There is a sudden increase in the price of milk. im confused with this one.
September 27, 2011

economics
Can you please exlain to me if I'm wrong not just correct me. ps. Ceteris paribusor the following markets, show whether change causes a shift in supply curve, a shift in demand curve, a movement along the supply curve, and/or a movement along the demand curve. a.housing ...
September 26, 2011

Math
(1/25)^1/2 i know the answer is 0.02 but how do you find it in a fraction without using a calc?
September 25, 2011

Math, Please Help!!!
Foil.
September 19, 2011

organic chemistry
b,e,g
September 18, 2011

physics
A eye pupil of 1 cm diameter can resolve about what angle in radians? First of all I don't understand what they mean by resolve. Resolve the light coming into the eye?
August 31, 2011

physics
the equation that I think I need is P = P0 + ρgh where P is 1 atm and P0 is 1/3 atm but I get a height of 3.06 x10^-4 meters which seems like a vvery small amount
August 15, 2011

physics
suppose you were able to blow air out of your mouth at one third of an atmosphere pressure. How tall a column of water could your mouth air pressure push up a straw? I know atm pressure is 1 atm but I'm really confused about how to go about this problem. thanks!
August 15, 2011

math/physics
The ratio of the mass of your body (50 kg) to a dollar bill(1 gram) is? body: 50 kg= 50,000 g 50000/1 so the ratio is 50,000? (That seems like too much to me)
August 14, 2011

Physics
Clap your hands and estimate the energy and power released as sound waves. I know Kinetic energy= 1/2*m*v^2 and Power is KE/t but how do I find the velocity of the sound wave made from clapping my hands? and for the mass do I use the mass of my hands? thanks
August 13, 2011

mat
harvest cereal comes in boxes of different sizes.the regular box holds 7/8 pounds.the small box holds 2/3 as much. How much cereal does the small box hold?
May 2, 2011

physics
A skier of mass 72 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 65 m up a 30° slope (assumed frictionless) at a constant speed of 2.7 m/s? (b) What power must a motor have to perform this task?
March 20, 2011

chemistry
What is my theoretical yield of iron II chloride if I start with 34 grams of iron II bromide?
March 13, 2011

physics
Find the height from which you would have to drop a ball so that it would have a speed of 6.6 m/s just before it hits the ground.
March 11, 2011

physics
A projectile is launched with a speed of 41 m/s at an angle of 55° above the horizontal. Use conservation of energy to find the maximum height reached by the projectile during its flight.
March 11, 2011

physics
A sledge loaded with bricks has a total mass of 18.9 kg and is pulled at constant speed by a rope inclined at 19.3° above the horizontal. The sledge moves a distance of 19.8 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0...
March 9, 2011

physics
A child and sled with a combined mass of 50.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 3.40 m/s at the bottom, what is the height of the hill?
March 9, 2011

physics
A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.5 m/s as in the figure below. If his speed is 27.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
March 9, 2011

heart
how long does it take to design, test, and get FDA approval of an artificial heart valve?
February 21, 2011

Relative Acidities
Rank the given compounds on their relative acidity. Here was the order I thought it was but it turned out to be wrong. (i based it based off of sp being most acidic and sp3 being least acidic) STRONGEST HC(triple bond)C-CH3 H2C=CH2 CH3NH2 H2O CH4--> WEAKEST and then I ...
February 16, 2011

ochem
list from strongest acid to weakest acid HC(triple bond)CCH3 H2C=CH2 H3CNH2 CH4 H2O i thought the order went HC(triple)CCH3 H3CNH2 H2O H2C=CH2 CH4 but it comes out as wrong and i dont know why >
February 14, 2011

Biology- DNA
What is needed to synthesize DNA? -a DNA strand -a primer and is that it?
February 7, 2011

Complex Numbers
Oh thank you so much i forgot that when you that the square root of a negative you get the complex #
January 31, 2011

Complex Numbers
How do I go about finding the solutions to the following x^2-6x+25=0 I know the answer is 3-4i and 3+4i however, I do not know how to go about finding the these solutions Thanks :)
January 31, 2011

Math
of the 43 presidents 15 were elected to 2 terms. what fraction of us presidents were elected two terms? HELP! I have been at this one for over two hours and I can't come up with the answer.
January 9, 2011

bio
according to Stephens, when are learning behaviors expected to evolve?
December 17, 2010

math
find the slope and y-intercept of the line in the given equation: y=6/7x-4
December 16, 2010

math
Thank you.
December 16, 2010

math
Given the linear equation y=-3/2x+1, find the y-coordinates of the points (-4), (-2), and (6). Please show all of your work. Plot those points and graph the linear equation.
December 16, 2010

bio
What is the grandmother effect in humans? what is the grandfather effect?
December 15, 2010

bio
what is the sociobiology controbersy?
December 15, 2010

Calculus
What's the practical domain and range of this volume function: 4x^3-39x^2+93.5x
December 15, 2010

math
solve v=(1/3)t+12
December 12, 2010

bio
what is prey flushing?
December 9, 2010

bio
what is the edge effect? (as part of group living)
December 9, 2010

science- chemistry
How much energy in kilojoules is needed to heat 5.00 g of ice from -10.0 C to 30.0 C ?
December 7, 2010

Spanish 1
Use the cues below to write sentences with the verb GUSTAR. MODELO: comida italiana/Vilma = A Vilma le gusta la comida italiana. 1) quien/los animales 3) quienes/la musica
November 29, 2010

Spanish 1
A spanish exchange student is trying to figure out what his friends like to eat. Provide the correct pronoun forms to complete his sentences below.: ____ gusta la comida china. A Patricia y a Juan ____ gusta la comida mexicana. ¿A vosotros ____ gusta la comida italian? ...
November 29, 2010

bio
what is an example of a naturally fragmented habitat, and a habitat that has been fragmented by human land use?
November 29, 2010

ecology
what is the atlantic pahtway? and why does its path through upstate New York raise special conservation concerns for woodlands and wetlands on the south side of Lake Ontario?
November 29, 2010

math
3a+8=15-(9a-9)
November 3, 2010

world history
I was wondering how to spell Ida Peeiffer I mean like this lady couldn't even find it on the internet how crazy is that.
November 1, 2010

math
Use Descarte's rule of signs to discuss the possibilities for the roots of the equation. Do not solve the equation -5r^(4)+6r^(3)+9r-15=0
October 26, 2010

math
Use the rational zero theorem, Descartes rule of signs, and the theorem on bounds as aids in finding all real and imaginary roots to the following equation: 4x^(3)-17x^(2)+16=0
October 25, 2010

math
solve the equation for all real and imaginary solutions (x-3/2)^2-2(x-3/2)+26=0
October 21, 2010

math
Find all real solutions: sqrt(x+10)+ sqrt(x-1)=11
October 21, 2010

chemistry
If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?
September 29, 2010

Math, I have partial answer..
Find the vertex for f(X)=-x^2+8x+6 I came up with (4,22)but i'm not sure. If so, what is the line of symmetry?
September 24, 2010

word problem
Thank you, Ms. Sue....I had the right concept but was stuck in the last part... Allie
September 24, 2010

Math word problem
The hypotenuse of a right triangle is 22 m long. The length of one leg is 10 m less than the other. Find the lengths of the legs. I have so far let one leg be x the other leg will be x-10 x^2 +(x-10)^2=22^2 x^2+x^2-20x+100=484
September 24, 2010

health
What are the ethicl considerations in obtaining a persons DNA?
September 21, 2010

Math, plz help
How do I write a quadratic equation having the given numbers as solutions of -9 and 3
September 17, 2010

Math
This question is in my FLVS test.... and i have NO idea. O_O"
August 20, 2010

Chemistry
The reaction below shows the corrosion process of iron. Calculate E°cell for the corrosion process and state whether you would predict that this is a spontaneous or nonspontaneous process. 2 Fe (s) + O2 (g) + 4 H+ (aq) → 2 Fe2+ (aq) + 2 H2O (l)
August 8, 2010

Chemistry
Calculate ΔG at 298 K for the electrochemical cell consisting of Au metal in a 0.00500 M Au(NO3)3 solution and Cu metal in a 0.950 M Cu(NO3)2 solution.
August 8, 2010

Critical Thinking 205
Thank you I didn't ask the question right. Which one of the 3 is the best?
May 8, 2010

Critical Thinking 205
which one of these make an argument the best? Which one of these is the weakest? Or how are the terms used in arguments? Here are the terms - Valid/ Invalid, -Sound/ Unsound, -Strong/ Weak
May 8, 2010

chemistry
how much heat dows a 23.0g ice cube absorb as its temp increases from -17.4deg C to 0.0deg C?
April 29, 2010

AP Chemistry
I came up with 6.67 x 10^-3 g solute/ 100g solvent. Based on the information in the problem, does this seem about right?
April 21, 2010

AP Chemistry
The question asked... Calculate the solubility of calcium sulfate in grams solute per 100 grams solvent. Assume that the volume occupied by the solute in the solution in negligibly small. I solved and got 4.9 x 10 ^-3 mol/L... how do I put this in grams solute per 100 grams ...
April 21, 2010

Math
Answer to question 2 about credit card debt in the US is RIGHT SKEWED.
April 15, 2010

Math
a ladder 10 ft long rests against a vertical wal. if the bottom of the ladder slides away from the wall at a rate of 0.7 ft/s, how fast&...
March 29, 2010

chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 50 g of water at 20 oC and 50 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
March 10, 2010

chemistry
The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 263.0 grams of diethyl ether to raise the ...
January 31, 2010

chemistry
The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 263.0 grams of diethyl ether to raise the ...
January 31, 2010

physics
A mass is hung from a beam of weight 2.0 N and length 81 cm. The tension and angle of the cable supporting the beam is 5.0 N at an angle of 40° from the horizontal. Using torques produced calculate the value of the unknown mass.
November 24, 2009

Chemistry
About twenty radioisotopes with ultra-long half-lives, from 82 million years (244- Plutonium) to 6 million billion years (50-Vanadium) are found in the earth’s crust, yet no radioisotopes with half-lives less than 70 million years (146- Samarium) are found. Why not? Use ...
November 16, 2009

chemistry
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each Al atom has a radius of 1.43 angstroms, what is the length of a side of the unit cell?
October 20, 2009

History
After the Treaty of Paris, what policy changes did Britain make for the colonies?
September 2, 2009

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