Thursday

October 30, 2014

October 30, 2014

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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