Friday

May 6, 2016
Total # Posts: 1,262

**Science**

What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
*September 10, 2010*

**chemistry**

how to balance ZnO+2HCl yields ZnCl2+H2O
*September 8, 2010*

**math**

Hoshi walk 10 meters in 3 sec. a. what is her walking rate? b. at this rate how long does it take to walk 100 meters c. suppose she walks the same rate for 50 sec. how far does she walk d. wright an equation that represents the distance D that Hoshi walks in 1 sec
*September 2, 2010*

**math**

easy
*September 1, 2010*

**The Question that was not answered. (twice)**

What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
*August 28, 2010*

**bio**

What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
*August 28, 2010*

**Chemistry**

sources of error can include human errors made by you during the experimentation or your surroundings which may have affected your outcome.
*August 28, 2010*

**AP Biology**

What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
*August 28, 2010*

**Math**

haha sorry. i didn't bother to read the entire thing. you must divide first in order to root both sides
*August 28, 2010*

**Math**

Please excuse my dear aunt sally
*August 28, 2010*

**Math**

Show that the transformation T:R^2->R^2 given T(x1,x2)=(3x1-5x2,x1+2x2) is linear by verifying that satisfies the defination of linear.
*August 13, 2010*

**Linear Alebra**

Show that the transformation T:R^2->R^2 given T(x1,x2)=(3x1-5x2,x1+2x2) is linear by verifying that satisfies the defination of linear.
*August 13, 2010*

**Algebra**

For what real number k does 3x^2 k factor as 3(x 2)(x + 2)? Can someone please help with this question? I can not understand how it says to solve this in the book
*August 5, 2010*

**British Literature**

what is number 4?
*July 21, 2010*

**MATH HELP**

any points: I can use (2,6) or (10,70)?
*July 20, 2010*

**MATH HELP**

1. Consider the following. f(x)=8x-10 g(x)=x^2-4x+10 (a) Find the points of intersection of the graphs. ANSWER:(2,6) are the smaller values and (10,70) are the larder values (b) Compute the area of the region below the graph of f and above the graph or g. How do I answer part b?
*July 20, 2010*

**programming**

I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
*July 10, 2010*

**programming**

I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
*July 10, 2010*

**programming**

I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
*July 10, 2010*

**chem**

A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from
*July 10, 2010*

**MATH**

Evaluate the indefinite integral. (Use theta for ƒÆ.) ç(8ƒÆ + cos(7ƒÆ))dƒÆ Ans: blank + C C is constant. How do I evaluate it?
*July 1, 2010*

**Math**

Find the general antiderivative of f (x) and check your answer by differentiating. f(x) = x^5 + 9 Need Help.
*July 1, 2010*

**Math**

Use the following table of values to estimate the area under the graph of f(x) over [0, 1] by computing the average of R5 and L5. Table: x: 0 0.2 0.4 0.6 0.8 1 f(x): 51 48 46 43 41 38 I need help with this problem.
*July 1, 2010*

**alg**

The answer would be D. 1. (2/x-1)-3/4= (5/x-1) -(2/x-1) -(2/x-1) 2. -3/4=(3/x-1) 3. (x-1)-3/4= 3 (distribute and you'll get #4.) 4. -3/4x+3/4=3 5.-3/4x= 3-3/4 6. -3/4x= 2.25 7. 2.25/(-3/4) x= -3
*July 1, 2010*

**physics**

a ring rotates ar 30rad/s and has a radius of 3m and a mass 0f 100kg. If a disk(mass=40kg and with a radius of 4m) is dropped on the ring so the centers are aligned, what will be the resulting rotational speed of the ring-disc combination?
*June 29, 2010*

**Statistics**

87.65
*June 24, 2010*

**Calculus**

at the end when you get dy/dx = 20/(5x+4y -16) ... what do you replace y with? in the beginning you have y = 4ln(5x+4y) the answer is only in terms of x...
*June 19, 2010*

**Calculus**

If f(x) = 4ln(5 x+ 4ln(x)), find f'( x ).
*June 19, 2010*

**statistics**

Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking-even if they are not exposed to the usual pattern of sunlight. To test this...
*May 29, 2010*

**math**

500 acres of land costs 800 dollars and every year there is a three percent increase in price then it gives the end cost was one thousand. it asks for the equation using v=p(1+r) raised to the n power
*May 25, 2010*

**math**

A certain number changes from 200 to 900 within three hours find the vaulue of k using the formula n times e raised to k times t
*May 25, 2010*

**Physics**

that isn't right either but i guess this thing is retarded so w.e thx though
*May 8, 2010*

**Physics**

A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
*May 8, 2010*

**Physics difficult... chris help again plz.**

A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
*May 8, 2010*

**Physics**

this isn't the right answer either
*May 7, 2010*

**Physics**

A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
*May 7, 2010*

**science**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
*April 28, 2010*

**physics**

A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a whistle at a frequency of 3000 Hz. What is the ...
*April 21, 2010*

**PHYSICS**

A 16 kg block slides down a 30 degree frictionless incline where it is stopped by a strong Hook's Law spring at the bottom. The spring constant is k = 9.8 x10^4 N/m. If the block slides 9 m from the point where it was released (from rest) to the point where it comes to ...
*April 20, 2010*

**physics**

Near the surface of the Earth, a startled armadillo leaps vertically upward at time t = 0, at time t = 0.5 s, it is a height of 0.98 m above the ground. At what time does it land back on the ground?
*April 20, 2010*

**Physics**

A motorist drives along a straight road at a constant speed of 60 m/s. At time t = 0 she passes a parked motorcycle police o±cer. The o±cer takes o® after her at t = 0 and accelerates according to the formula a(t) = bt, where t is the time and b is a positive...
*April 20, 2010*

**maths**

360
*April 20, 2010*

**math**

I'm completely lost withhow u solve this quadratic equation using the square root method 6x^2=1
*April 18, 2010*

**Math**

Laura invested her savings in two investment funds. The that she invested in Fund A returned a profit. The amount that she invested in Fund B returned a profit. How much did she invest in Fund B, if both funds together returned a profit?
*April 18, 2010*

**chemistry**

how do you convert the moles of nh3 co2 ang h2o? is it just 2 mol nh3 1 mol co2 and 1 mol h20?
*April 16, 2010*

**chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.
*April 16, 2010*

**Chemistry**

If you add 2.50 mL of .150 M HCl to 100 mL of a buffer consisting of .100 M CH_3COOH and .200 M CH_3COONa, what will be the change in pH? (Ka of CH_3COOH is 1.7 x 10^-5).
*April 11, 2010*

**physics**

Got it, thanks!
*March 29, 2010*

**physics**

Two flat slides of glass are seperated at one edge by a thin wire, as shown below. The top surface of the upper slide and the bottom surface of the lower slide have special coatings on them so that they reflect no light. The system is illuminated with light of wavelength 550 ...
*March 29, 2010*

**math**

Determine the area between the z-scores in each pair for a normal distribution. Round your answers to 4 decimal places. (a) 1.12 and 1.98 (b) –2.12 and –1.0
*March 28, 2010*

**Business Law**

Business Law Exam 210 True Or False questions. 1. Both "commom law: contracts and UCC contracts are subject to the plain menaing rule only if they are simple and plain contracts. 2.when a term in a contract is ambiguos, it is generally interpreted in favor of the party ...
*March 27, 2010*

**math**

which is right
*March 22, 2010*

**physics**

Two parallel wires which carry currents I1 = 69 A and I2. The top wire is held in position, the bottom wire is prevented from moving sideways but can slide up and down without friction. If the wires have a mass of 5.3 g per metre of length calculate current I2 such that the ...
*March 22, 2010*

**Chemistry**

How much energy will be released when 11.11g of calcium chloride dissolves in 100 mL of water. deltaHf of Ca 2+ (aq)=-543Kj/mol, deltaHf of Cl 1-(aq) = -167Kj/mol CaCl2(s) ==> Ca 2+(aq) + 2Cl 1-(aq)
*March 4, 2010*

**statistics**

An experiment consists of rolling a die and selecting a marble from a bag. the bag has 7 orange, 3 pink, and 6 grey marbles. What is the probability of rolling a multiple of 3 and selecting a pink marble? Anwer: The two events are independent of each other, therefore we ...
*March 2, 2010*

**Physics**

Assuming I did it correctly: F=ma mass = the mass of the electron = 9.11 * 10^-31 kg a= 115 m/s plug in your known variables F will equal 1.05 * 10^-28 Newtons (N) Next, F=qE q equals the charge of the electron, or "point charge". q=1.6 * 10^-19 C Solve for E, so E=F...
*March 1, 2010*

**biology**

suck a dick
*February 25, 2010*

**Math**

A coin bank contains only nickels,dimes, and quarters. the value of the 19 coins in the bank is $2.00. There are twice as many nickels as dimes. Find the number of each type of coin in the bank. How do I solve this?
*February 24, 2010*

**Mathematics**

is it 4 liter???
*February 24, 2010*

**Math**

A coin bank contains only nickels,dimes, and quarters. the value of the 19 coins in the bank is $2.00. There are twice as many nickels as dimes. Find the number of each type of coin in the bank. How do you solve this?
*February 24, 2010*

**Chemistry**

false
*February 23, 2010*

**psych**

At the end of the article they did do an experiment?
*February 14, 2010*

**psych**

Does the study in the article below use the experimental method or the correlation method and why? I'm stuck and keep going back and fourth on it Soccer Referees Hate the Tall Guys Many of soccer's greatest players have been small fries. Diego Maradona is only 5'5&...
*February 14, 2010*

**chemistry**

How many atomic orbitals are formed duing a pi bond between p two orbitals? Does the pi bond count as another orbital? Im confused if the answer is 3 or 2? can someone help me :(
*February 7, 2010*

**Algebra**

C=z+zse
*February 5, 2010*

**math**

A pencil, eraser, and notebook cost $1 in total. A notebook costs more than 2 pencils, 3 pencils cost more than 4 erasers, and 3 erasers cost more than a notebook. How much does each item cost?
*February 4, 2010*

**Math**

How many milliliters of a 75% acid solution must be added to 90 ml of a 10% acid solution to make a 25% acid solution?
*February 3, 2010*

**math**

How many milliliters of a 75% acid solution must be added to 90 ml of a 10% acid solution to make a 25% acid solution?
*February 3, 2010*

**PUBLIC POLICY DEVELOPMENT IN HEALTH & HUMAN SERVIC**

THIS IS THE ANSWER THAT i HAVE COME UP WITH PLZ TELL ME WHAT YOU THINK....I feel that we can use the same problem analysis for both historical and modern problems because although we have come a long way we can still learn from history and the problems in today's society ...
*January 26, 2010*

**PUBLIC POLICY DEVELOPMENT IN HEALTH & HUMAN SERVIC**

Why are we able to use the same problem analysis categories mentioned in Ch. 1 of Social Policy and Social Programs to analyze historical problems as well as problems facing modern society? I have read the whole chapter and I still can not find the answer to this question can ...
*January 26, 2010*

**science**

air pressure changes whats the effect of that
*January 25, 2010*

**Physics **

Thank you!!! :)
*January 18, 2010*

**Physics **

I don't see the solution posted to "ucieng". Where can I find it? Thanks
*January 18, 2010*

**Physics **

An iron bolt of mass 70.0 g hangs from a string 31.3 cm long. The top end of the string is fixed. Without touching it, a magnet attracts the bolt so that it remains stationary, displaced horizontally 23.0 cm to the right from the previously vertical line of the string. a)find ...
*January 18, 2010*

**chemistry**

How many grams of NaCl do you have if you have 2.30 x 10 to the 23rd olecules of salt?
*January 12, 2010*

**Chemistry-Balancing Equations**

I need help balancing equations. _C7H60+_02->_C02+_H20 I don't know how to balance it because when i do it just won't work out ill have too much on one side and it just wouldn't work. i know im missing a rule or something.
*January 12, 2010*

**Chemistry**

How many grams of carbon dioxide are produced if you react 200g of benzaldehyde reacr with 32g of oxygen? its stoichiometry, i have no idea how to do this...
*January 12, 2010*

**Math**

1/5
*January 10, 2010*

**APUSH**

Asses the Validity of the fallowing statement: "Reconstruction failed to bring economic success to former slaves."
*January 4, 2010*

**geometry**

Find the complement of „£B.
*December 12, 2009*

**Math-Statistics**

For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
*December 9, 2009*

**math-test statistic**

If we have a sample of 12 drawn from a normal population, then we would use as our test statistic A) z0 with 11 degrees of freedom B) t0 with 12 degrees of freedom C) z0 with 12 degrees of freedom D) t0 with 11 degrees of freedom
*December 5, 2009*

**math**

Is the rate 3/4 cup of butter /6eggs equal to the rate 9 cups of butter/73eggs
*November 24, 2009*

**math**

Find the best buy on cashews (1lb is 16oz), a) 1lb for $6.09 B. 10oz for $4.59 C. 1lb 4oz for $7.09 D. 12oz for $5.09
*November 24, 2009*

**CRT 205**

A(n)_____ is a set of claims intended to support or prove a conclusion.
*November 22, 2009*

**Chemistry**

I ran into the same issue, to me determining the KWH is simple, multiply current+Volts* hrs used and you will get KWH. But for some reason the answer that they have given is the energy requirement for a single reaction so here is how you figure it. kwh=(nfE)/(3.6e6 * ...
*November 18, 2009*

**statistics**

Health Care: Flu Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of people under 65 years old get the flu each year. The general population ...
*November 11, 2009*

**Math**

The Tao Inc. purchased an asset for $170,000 with a salvage value of $8,500 have a useful life of four years. Find the depreciation expense for the first year using the 150% declining balance method.
*November 10, 2009*

**math**

List two relationships that are true about pairs of sides or angles or diagonals in a. a parallelogram. b. a rectangle. c. a rhombus.
*October 30, 2009*

**math**

a. If you begin with a right triangle with sides a, b, and c and decrease the right angle so it is an acute angle, how does compare with ? b. Answer this question for the situation where you increase the right angle so that it is obtuse. I have to use a formula to show the ...
*October 30, 2009*

**math**

4x+10=
*October 30, 2009*

**5th grad math cubic units**

12
*October 26, 2009*

**math/graphing**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*October 22, 2009*

**probability**

Five numbers are to be picked, without repetition, from 44 numbers to determine the winner of the Fortune Five game in the state lottery. If the order of the numbers is insignificant, how many different ways can a winning quintuple be selected? What is the probability of winning?
*October 21, 2009*

**math/probability**

A jar contains four marbles, each a different color: red, blue, green, and yellow. If you draw two marbles from the jar, one after another, replacing the first before drawing the second, what is the probability of getting a. two red marbles? b. a red marble on the first draw ...
*October 21, 2009*

**math**

The mean systolic blood pressure of adult males is normally distributed with a mean of 138 (millimeters of mercury) and a standard deviation of 9.7. What percent of adult males have blood pressure between 161.28 and 164.9?
*October 21, 2009*

**math157**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*October 21, 2009*

**misconception?**

A student asks, “What’s wrong with the argument that the probability of rolling a double 6 in two rolls of a die is 1/3 because 1/6 + 1/6 = 1/3? ”Write an explanation of your understanding of the student’s misconception.
*October 21, 2009*

**probability**

Five numbers are to be picked, without repetition, from 44 numbers to determine the winner of the Fortune Five game in the state lottery. If the order of the numbers is insignificant, how many different ways can a winning quintuple be selected? What is the probability of winning?
*October 21, 2009*

**math fair**

How did you get $3.50?
*October 21, 2009*