Thursday

May 28, 2015

May 28, 2015

Total # Posts: 275

**Biology**

can anyone tell me a little about MacArthur and Wilson's theory of island biogeography? I need to answer the question Describe a series of small habitats that exist within 10 to 20 kilometers of your house and which might be subject to MacArthur and Wilson's theory of ...
*December 6, 2011*

**biology**

If im thinking correctly Aristotle paired things with similar characteristics. I would do some quick research on him before answering but I would go with D.
*December 6, 2011*

**math**

number of people who hear a rumor after t hours is N(t) = 2000/ 1 + 499e^-0.3t How long will it take for 200 people to hear the rumor?
*December 3, 2011*

**Physics**

Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 75 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is the machine using in...
*December 2, 2011*

**Physics**

Sweating is one of the main mechanisms with which the body dissipates heat. Sweat evaporates with a latent heat of 2430 kJ/kg at body temperature, and the body can produce as much as 1.3 kg of sweat per hour. If sweating were the only heat dissipation mechanism, what would be ...
*December 2, 2011*

**Physics**

An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 670 K. If the initial pressure is 8.00 104 Pa. (a) Find the work done on the gas. Answer is in J (b) Find the thermal energy transfer Q. Answer is in J
*December 2, 2011*

**Math**

The answer is no solution, unless ur teacher says it has one. I had ethe same problem and its no solution. Hope this helps
*December 1, 2011*

**Finance**

For the first time in a very long time (perhaps ever!), the concept of financial risk and risk management has become a topic of concern at Presidential press conferences. Such concern has centered on esoteric financial products such as derivatives that are used to manage risk...
*November 14, 2011*

**science**

what change of state happens when a gas loses energy?
*November 4, 2011*

**bio**

what is the cisternal maturation hypothesis for Golgi apparatus function?
*November 2, 2011*

**bio**

how does the explosive polymerization of G-actin propels L. monocytogenes through the cytoplasm?
*November 2, 2011*

**bio**

what is a mechanism for how EB1 can mediate the extension of ER cisternae along microtubules?
*November 2, 2011*

**Spanish- SraJMcGin please recheck**

Thank you
*November 2, 2011*

**Spanish- SraJMcGin please recheck**

I think it does-so I was okay when I used mejor que in my sentence? I wasn't suppose to change anything??
*November 2, 2011*

**Spanish- SraJMcGin please recheck**

I'm not sure what you meant by correcting this sentence--Thank you for any further explanation you can give-- 3. Tocar el piano es______tocar la guitarra. (+bueno) Tocar el piano es mejor que tocar la guitarra. You said in an earlier post: mejor que(irregular - or ...
*November 2, 2011*

**Spanish**

For number ten and eleven above I think I put the wrong answer. To place verb in present progressive it would be: 10.Yo escucho it would be Yo estoy escuchando, correct? 11. nosotros hablamos would be Nosotros estamos hablando, correct? Thank you
*November 2, 2011*

**Spanish**

Please check these- Fill in comarative form for the first three: 1.Surfear es ____ interesante (cazar.) Surfear es más divertido que cazar. 2.El fútbol es ____ el golf.(interesante) El fútbol es más interesante que el golf. 3. Tocar el piano ...
*November 2, 2011*

**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*

**Chemistry 105**

(729-Pw) =?
*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*