Sunday

March 29, 2015

March 29, 2015

Total # Posts: 1,409

**chemistry**

A 15.0ml sample of NaCL solution has a mass of 15.78g.after the NaCL solution is evaporated to dryness, the dry salt residue has a mass of 3.26g. calculate the following concentrations for the %(m/m), % (m/v), molarity (M)
*November 1, 2012*

**Cryptology 101**

DES and AES are both “turn the handle” algorithms, in that they use repetition of some number of very similar cycles. What are the advantages to implementer, users, cryptanalysts of this approach?
*October 31, 2012*

**statistics**

105.88
*October 29, 2012*

**Math**

Julie is solving the equation x2 + 6x + 9 = 0 and notices that the discriminant b2 - 4ac has a value of 0. This tells her that the equation has
*October 23, 2012*

**chemistry**

how are the ionization energies evidence for the structure of the atom especially the electron configurations for atoms ?
*October 23, 2012*

**Chemistry**

144 g s8
*October 13, 2012*

**newton's law**

thanks but my instrutor dont want me to use energy to solve the problem since we havnt learn it yet, can you do it using newton's law?
*October 13, 2012*

**newton's law **

A block of mass M is projected up a frictionless inclined plane with a speed VO. The angle of incline is given as theta. a. How far up the plane does it go? b. How much time does it take to get there? I was stuck after Fg(cos(theta+90)= Ma_x gcos(90+theta)/M = a_x can someone ...
*October 13, 2012*

**newton's law **

Find the acceleration and tension in an Atwood's machine. Two different masses connected by a string over a pulley which is at rest.
*October 13, 2012*

**Math.. how to get linear function**

The total length y is a linear function of the tail length x with great accuracy. The domain is the interval from 30mm to 200mm, and the range is the interval from 200mm to 1400 mm. The following two points are given: X0= 60mm, Y0= 455mm, X1=140mm, Y1= 1050mm. Find the ...
*October 13, 2012*

**Physics. PLEASE HELP!**

two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, what are the net forces acting on m1 ...
*October 11, 2012*

**Physics**

.224
*October 11, 2012*

**Calculus**

Thank you
*October 8, 2012*

**Calculus**

Given F(2)=1,F'(2)=5,F(4)=3,F'(4)=7 and G(4)=2,G'(4)=6,G(3)=4,G'(3)=8, find: a)H(4)if H(x)= F(G(x)) b)H'(4)if H(x)= F(G(x)) c)H(4)if H(x)= G(F(x)) d)H'(4)if H(x)= G(F(x)) e)H'4 if H(x)= F(x)/G(x) Please Help!
*October 8, 2012*

**Calculus**

Thank you
*October 5, 2012*

**Calculus**

Find the derivative of y=15x^7+7^x+22
*October 5, 2012*

**Math**

I had that as well, but I wasn't sure if you could break it down that way. I guess we will find out
*October 4, 2012*

**Math**

How do you make this true Using 48, 6, 2, and 5 =18 by using (+, -, x, or /)
*October 4, 2012*

**Production & Operations Mgmt in Business**

If someone could help me, I am truly desperate here. I am struggle with this problem. – Simple Linear Regression Applications Interpretation and Use of Computer Output (Results) (1) The management of an international hotel chain is in the process of evaluating the ...
*September 30, 2012*

**AP Chemistry**

A 34.05 gram liquid sample of an unstable compound is deposited in a metal piston assembly that has a cylinder with a diameter of 20.0 cm. After the sample is added, the piston is placed in contact with the liquid and the piston vent is closed. This process removes all ...
*September 26, 2012*

**Physics**

Do your own work
*September 26, 2012*

**math**

2x^2 + 5x - 8 = 0 Solve the quadratic equation by completing the square.
*September 20, 2012*

**math**

2x^2 + 5x - 8 = 0 Solve the quadratic equation by completing the square.
*September 20, 2012*

**Math**

Ally loves the beach and decides to spend the summer selling various ice cream products on the beach. From her account course, she knows that her total cost is calculated as Total Cost= Fixed Cost + Various Cost She estimates that her fixed cost for the summer season is $50 ...
*September 18, 2012*

**Physics**

A major leaguer hits a baseball so that it leaves the bat at a speed of 28.0 and at an angle of 36.9 above the horizontal. You can ignore air resistance.At what two times is the baseball at a height of 9.50 above the point at which it left the bat?
*September 17, 2012*

**precalculus/check please**

Find the difference quotient by using f(x+h)−f(x)/h 1) f(x) = √(2x+1) answer (√(2x+1+2h) - √(2x+1))/h can you check please
*September 16, 2012*

**precalculus**

Find the difference quotient by using f(x+h)−f(x)/h 1) f(x) = √(2x+1) answer (√(2x+1+2h) - √(2x+1))/h can you check please
*September 16, 2012*

**math**

A piano manufacturer has a daily fixed cost of $1200 and a marginal cost of $1500 per piano. Find the cost C(x) of manufacturing x pianos in onde day. Use your function to answer the following questions: a)On a given day, what is the cost of manufacturing 3 pianos? b)What is ...
*September 15, 2012*

**math**

The cost in $ of making "x" leaf blowers is given by C(x)=45x+6000. Each blower can be sold for $60.00 a)find revenue function b)find equation that expresees that profit for selling "x" leaf blowers. c)How many units must be sold to break even?
*September 15, 2012*

**US history**

What was Florida name before call it Florida?
*September 15, 2012*

**geometry**

Rays PQ and QR are perpindicular. Point S lies i the interior of angle PQR. If the measure of the angle SQR=4+7a and the measure of angle SQR=9=4a, find the measure of angle of PQS and angle SQR.
*September 12, 2012*

**Physics**

A major-league pitcher can throw a baseball in excess of 46.6 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 16.3 m away from the point of release?
*September 11, 2012*

**Physics**

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.8 m/s at an angle of 43.9° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
*September 11, 2012*

**Physics**

A skateboarder shoots off a ramp with a velocity of 6.8 m/s, directed at an angle of 56° above the horizontal. The end of the ramp is 1.1 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point ...
*September 11, 2012*

**Algebra HELP!**

Starting with the kinematics equation x = vot + ½ at^2, derive an expresion relating the acceleration and initial velocity of an object to two paired position and time measurements. In other words, if an object's position is x1 at t1, find the acceleration a and the...
*September 11, 2012*

**US history**

Indicate below the type of government each colony had in the year 1750. 1 NEW HAMPSHIRE; ROYAL 2 MASSACHUSETTS; ROYAL 3 CONNECTICUT; SELF-GOVERNING 4 RHODE ISLAND;SELF-GOVERNING 5 NEW YORK; SELF-GOVERNING 6 NEW JERSEY;ROYAL 7 PENNSYLVANIA;PROPRIETARY 8 DELAWARE; PROPRIETARY 9 ...
*September 4, 2012*

**psycology**

One consequence of providing an inaccurate opertional definition of the properties we intend to measure, is that the measurement will be: Invaild, Reliable, Valid or Powerful
*August 26, 2012*

**social studies**

If a bow with a draw weight of 60 kilograms were to fire at someone 5 meters away but the user had to roll first before drawing back and firing two arrows. Would the target have enough time to dive for cover behind a rock?
*August 2, 2012*

**math**

Using Cuisenaire rods, what is the unit rod if the purple rod represents 2/3?
*July 29, 2012*

**Biomechanics**

A ball is thrown vertically upwards in the air at a velocity of 50(m/s) and reaches a maximum height of 20(m). Calculate the time when the ball reaches the 10(m) mark, while going up and coming down. Use the following equation of motion: y(f) = y(i) + v(i)t+1/2at^2 y(f) and y(...
*July 17, 2012*

**math**

a-2/6 -5 = a+3/3 SOLVE FOR A solving equations with fractions
*July 12, 2012*

**Physics**

Please help me with my physics homework I've been given a week and can't for the life of me work out how it is done. Tom has a rubber ball which weighs 5 kilograms and bounces 3.8 meters from a drop height of 4 meters using this information please work out the mass of ...
*July 6, 2012*

**Algebra**

4x=8 and 5y=15 x=2 y=3 02.x+0.4y=1.7 and 8.3x-6.3y=-4.3 x=1.93 and y=1.31
*June 10, 2012*

**Chemistry**

g=.00461 ?
*May 28, 2012*

**Chemistry**

What mass of chromium II chlroide (CrCl2) is dissolved in 150.0mL of solution to prepare .250M solution? Please Help
*May 28, 2012*

**Health**

Writeacher, I need you help to rephrase and answer a question on the use of children in advertising. 1) I need to rephrase this: “ Advertisers want to reach into the hearts and minds of the people who are watching the ads. Today’s washing powders don’t just ...
*May 24, 2012*

**Art**

Writeacher,could you please check if all these sentences are possible? 1) I’m sure he didn’t rob the bank. He can't have robbed the bank He couldn't have robbed the bank . (is this possible?) 2) I’m certain he stole the ring He must have stolen a ring. ...
*May 24, 2012*

**Art**

Could you please check these sentences, Writeacher? Thank you. 1) A job seeker should make a short list of the job's requirements and should keep it in his mind during the interview. In this way he can bring in examples to demonstrate that he is the right person for the ...
*May 24, 2012*

**Art**

I left out these sentences. I hope you can have a look at them,too. Can you tell me if the modals are possible, Writeacher? 1) I’m sure he didn’t rob the bank. He can't have robbed the bank He couldn't have robbed the bank . (is this possible?) 2) I’m ...
*May 23, 2012*

**Foreign languages**

I urgenlty need you to check these sentences, please.Thank you. 1) A job seeker should make a short list of the job's requirements and should keep it in his mind during the interview. In this way he can bring in examples to demonstrate that he is the right person for the ...
*May 23, 2012*

**Art**

Could you please help me express the following evaluations? Thank you. 1) You wrote exactly what I included on the photocopy without varying (hardly/almost) anything. The only word you changed is not an English word. 2) You also failed to include information on the reading ...
*May 23, 2012*

**Art**

Can you please have a look at these sentences, please? 1) This information about the Augustan Age was not asked for in your test. You weren't supposed to introduce the Augustan Age. You should have focused on both Walpole's and Pitt's policy, the rise of a new ...
*May 23, 2012*

**Foreign languages**

Could you please check these sentences? Thank you,Writeacher. 1) In the first part if the novel she writes letters to her parents asking them for advice. However, she resists all her master's advances protecting virtue. 2) As a reward, he proposes marriage to her and she ...
*May 23, 2012*

**math**

ral sal tal val each have 1.85 in quarters and dimes.No two have the same number of coins together how many quarters do they have
*May 16, 2012*

**Pre-calc**

simplify cot(x+π)
*May 15, 2012*

**Pre-calc**

how many solutions are there to csc^2x=25 (0≤x<2π)
*May 15, 2012*

**Pre-calc**

Focus of the ellipse 9x^2+2y^2=36
*May 15, 2012*

**Pre-calc**

I am given the graph of y=f(x) and I am asked to sketch the graph of y=-2f(-x). How do I move and/or rotate the given graph?
*May 15, 2012*

**history**

please help me please.......
*May 14, 2012*

**history**

describe the difference between the poor and wealthy citizens of rome.
*May 14, 2012*

**history**

PLease help
*May 14, 2012*

**history**

describe the difference between the poor and wealthy citizens of Rome.
*May 14, 2012*

**geometry**

Two cones are similar. The larger cone, R, has a volume of 1331 cubic feet and the smaller cone, S, has a volume of 64 cubic feet. Find the scale factor of Cone R to Cone S.
*May 10, 2012*

**Math**

insert parentheses to make equation true. 5 / 3 + 3 x 5 = 4 1/6
*May 9, 2012*

**Probability Math**

Through a mix up on the production line, 5 defective light bulbs were shipped out with 32 good ones. If 4 are selected at random, what is the probability that at least 3 of them are defective?
*May 2, 2012*

**Calculus**

The manager of a large apartment complex knows from experience that 90 units will be occupied if the rent is 360 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 9 dollar increase in rent. Similarly, one ...
*April 26, 2012*

**Math**

what is g(f(x))? and f(g(x))? if f(x)=(1)/(sqaure root3x) and g(x)=x^2-5 Thanks!
*April 23, 2012*

**Chemistry**

How much volume(mL)of 2.50 M NaOH(aq)must be added to 25.0 mL of water to produce a 1.50 M NaOH solution? Thanks!
*April 23, 2012*

**math**

meg has 20 pet stickers to go on a page 1/4of them are dog stickers 1/2of them are cat stickers the rest are rabbit stickers how many rabbit stickers does she have?
*April 22, 2012*

**College Algebra**

ln(8x+3)=ln11
*April 20, 2012*

**science**

An aluminum bar is 2m long at a temperature of 20 degrees C What will be the length of the bar at a temperature of 100 degrees C
*April 19, 2012*

**physics**

FM radio signals are electromagnetic waves transmitted between frequencies of 88 MHz and 107 MHz. Find the range of wavelengths for these signals. largest___m smallest___m
*April 16, 2012*

**math**

3 sqrt-64x^3
*April 15, 2012*

**American Government One Question Please Help!**

LeXi<3 i know you
*April 15, 2012*

**@elena**

i noticed you helped a lot of people with their questions with physics ? can you hep me out please ? In putting, the force with which a golfer strikes a ball is planned so that the ball will stop within some small distance of the cup, say 2.00m long or short, in case the putt ...
*April 15, 2012*

**h.s. physics **

In putting, the force with which a golfer strikes a ball is planned so that the ball will stop within some small distance of the cup, say 2.00m long or short, in case the putt is missed. Accomplishing this from an uphill lie (that is, putting the ball downhill, ) is more ...
*April 15, 2012*

**h.s physics**

a baseball pitcher throws a baseball with a speed of 38m/s. estimate the average acceleration of the ball during the throwing motion,. in throwing the baseball, the pitcher accelerates the ball through a displacement of about 3.5 m from behind the body to hthe point where it ...
*April 15, 2012*

**h.s. physics**

a baseball pitcher throws a baseball with a speed of 38m/s. estimate the average acceleration of the ball during the throwing motion,. in throwing the baseball, the pitcher accelerates the ball through a displacement of about 3.5 m from behind the body to hthe point where it ...
*April 15, 2012*

**English 7 Help! - please read**

I think it just means she had a close relationship with the tree house. Like parents often have a soft spot or close relationship with their children. I don't know what story you're talking about, but basically I'm guessing the Tree house was like a get away spot ...
*April 15, 2012*

**math**

What is the square root of pi?
*April 13, 2012*

**english**

Hi I have to compare Mending Wall by Robert Frost to modern day time. I was thinking about comparing it to a song or movie, but I'm not sure of any. Do you have any ideas?
*April 11, 2012*

**math plz help **

how would you determine the number of diagonals in a regular 41-gon ?
*April 8, 2012*

**Probability**

Service time, T, at an auto center has a Weibull distribution with parameters θ=3.7 and β=1.35. What is the probability that at least 8 of the next 10 customers will have to wait more than 4.69 hours? What is the expected number of customers that will have to wait ...
*April 8, 2012*

**Math**

Hmmm well I certainly didn't want them to write a complex essay for me, just some a little help and some ideas. It's whatever though.
*April 3, 2012*

**Math**

I asked a question earlier: Identify and discuss 4 key actions taken by the U.S. Government between 1790 to 1820 that established long term policy in the U.S. Please help me answer this, thank you so much. and I got this response:Please note that we don't do students' ...
*April 3, 2012*

**social**

What were 3 groups that were in motion around the U.S. in the 19th century. Why did they change locations and how did this impact their lives?
*April 3, 2012*

**ACT**

Any practice online for ACT, PSAE or sample questions.Please To much stress.
*April 2, 2012*

**geometry**

A sandpit in the shape of a rectangular prism has length 7 feet, width 5 feet, and height 1.75 feet. It is filled to the brim with sand. Joe puts this sand into a second sandpit having the same shape but a larger base. He needs 17.5 cubic feet of sand to fill the extra space ...
*April 2, 2012*

**history (urgent)**

Identify and discuss 4 key actions taken by the U.S. Government between 1790 to 1820 that established long term policy in the U.S. Please help me answer this, thank you so much.
*April 2, 2012*

**math**

what is the volume of a triangle prism with a base area of 24ft*2 and a height of 18ft
*March 30, 2012*

**physics**

A vertical tube with a tap at the base is filled with water, and a tuning fork vibrates over its mouth. As the water level is lowered in the tube, resonance is heard when the water level has dropped 18 cm, and again after 54 cm of distance exists from the water to the top of ...
*March 28, 2012*

**spanish**

yo me
*March 25, 2012*

**spanish**

Yo ______ lavo ______ manos y ______ cara. ______ cepillo ______ dientes y ______ cepillo ______ pelo. Yo ______ pongo ______ ropa.
*March 25, 2012*

**chemistry**

draw amino acid.
*March 24, 2012*

**History**

Explain what does Robert.e.Lee says to his son in letter.
*March 22, 2012*

**History**

Explain what does Robert.e.Lee says to his son in letter.
*March 22, 2012*

**statistics**

Consider a random sample of 37 students, and consider the number who graduate in six years. . Find the probability that 20 students in the sample graduate in six years
*March 20, 2012*

**physics**

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted
*March 19, 2012*

**critical thinking test AU**

1. Question : The average height of members of the high school basketball team is six feet, three inches. Jerry is on the high school basketball team, so Jerry must be taller than six feet. The argument above is flawed because it confuses: Student Answer: 4 CORRECT an average ...
*March 12, 2012*

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