Saturday

February 6, 2016
Total # Posts: 916

**Math 157**

How many rectangles will fit about a point when tessellating the plane? How do you know?
*April 9, 2010*

**physics**

An electron, moving with a speed, 6.8 km/s, enters a magnetic field that has a strength of 6.9 T. The magnetic force on the electron is perpendicular to the electron's velocity. Determine the radius of the resultant path of the electron.
*April 9, 2010*

**calculus**

Thanks, but where did you get the 2a = 10 from?
*April 8, 2010*

**calculus**

Oh shoot. You're right. I took the last part from a different problem. The sum of the distances is equal to 10. Sorry.
*April 8, 2010*

**calculus**

Find the equation of the following. The locus of all points in a plane such that the sum of the distances from points (-2,-1) and (-10,-1) is equal to 6.
*April 8, 2010*

**phisics**

What is the gravitational potential energy of a 300.0 g coffee cup sitting on a table top 1.25 m above the floor?
*April 7, 2010*

**phisics**

What is the total mechanical energy of a 20 kg owl flying at 5.0 m/s through the air at a height of 25 m above the ground?
*April 7, 2010*

**phisics**

If a person were 300 meters above ground and it took them 7.746 secounds to hit the ground, how fast were they traveling?
*April 7, 2010*

**pre-calculus**

What is the polar form of the equation 3x - 4y = 12? The answer is r = 12/ (3cosx - 4 sinx) (x = theta) I don't know how to get the answer though.
*April 6, 2010*

**math**

Let U = {xƒ}x is an American}, C = {x/x is a smoker}, D = {xƒ}x has a health problem}, E = {xƒ}x is a male} Describe a person who is an element of each of the following sets. Describe a person who is an element of each of the following sets:i) C (ii) CnU (iii) ...
*April 1, 2010*

**staticitics**

I got the same answer for standard deviation, except the 5.75 should be rounded to the nearest tenth.
*March 30, 2010*

**Science**

Write the formula, substitute numbers and units(labels)Mike mixed 20g of 60C water with 40g of 25C water. The final temperature was 39C. 1.Calculate the change of temperature for hot water. 2.Calculate the calories transferred from the hot water. 3.Calculate the amount of heat...
*March 29, 2010*

**Science**

1.Air can be compressed. What does it mean and why can it be compressed? 2.Air can be expanded. What does it mean and why can it expand? 3.Air also contracts.What does that mean and how does that happen? 4.Can all gases contract and expand? Why or why not?? Please help me!
*March 29, 2010*

**Chemistry**

Time, (min): 0 10 20 30 Moles,(trans): 1.00 0.90 0.81 0.73 Given the following data, what is the order of the reaction? How long will it take for the half of the trans compound to decompose?
*March 24, 2010*

**Chemistry**

Kp=1.78 at 250 degrees for the decomposition reaction, PCl5(g)->PCl3(g)+Cl2(g. Calculate the percentage of reactant that remains if 10.0 moles of starting material are placed in a closed vessel at this temperature and 2.00 atm pressure. Also, determine the value of Kc for ...
*March 24, 2010*

**science**

The population of Singapore is 4987600 people. The territory of Singapore is 710.2 km^s. The population of Namibia is 2171000 people, while its territory is 824292 km^2. Estimate the population densities of Singapore and Namibia.
*March 24, 2010*

**Chemistry**

did you ever get an answer?
*March 23, 2010*

**chemistry**

What aldehyde and primary alcohol might be oxidized to yield 4-methylcyclohexanoic acid?
*March 21, 2010*

**Chemistry**

What aldehydes and primary alcohols might be oxidized to yield the following carboxylic acids: 1)p-methylhexanoic acid 2)pentanoic acid #1 should have been p-methylcyclohexanoic acid (p is para). My homework has the structure drawn out and I named it wrong. Sorry. It has a CH3...
*March 20, 2010*

**Chemistry**

Write the structure of the hemiacetals that results from the following reactions: 1)2-butanone + 1-propanol 2)butanal + isopropylalcohol I got this for #1: CH2-C-OCH2CH2CH3 with an OH on the single C and the CH2CH3 on the single C. I don't know how to do the second one. I ...
*March 20, 2010*

**Chemistry**

What aldehydes and primary alcohols might be oxidized to yield the following carboxylic acids: 1)p-methylhexanoic acid 2)pentanoic acid
*March 20, 2010*

**trig**

How do I dertermine the measure of theta for the equation 4cos theta - sqrt 12 = 0. My answer was 2pi/3,4pi/3 I'm told it's wrong could you please show me how to do this type of question
*March 17, 2010*

**physics**

Three charges are arranged as follows: +3 mC located on the y-axis at +15 mm; -2.5 mC located on the x-axis at -25 mm; and +4.0 mC located at the origin. Determine the magnitude of the force acting on the charge located at the origin.
*February 21, 2010*

**Chemistry Question!!**

Realize there are 0.830 g of I2 at equilibrium... not I
*February 19, 2010*

**science**

3. Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s) + 2HBr(aq) ---> FeBr2(aq) + H2(g) What mass of HBr (in g) would you need to dissolve a 3.2 gram pure iron bar on a padlock? What mass of H2 would be produced by the complete reaction of the ...
*February 14, 2010*

**physics**

Estimate the magnitude of the electric field in a cell membrane with a thickness of 8nm
*February 13, 2010*

**Science**

What are some examples of speed and velocity? I'm trying to illustrate them for a project, but i don't know what to draw
*February 2, 2010*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s
*February 2, 2010*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s?
*February 1, 2010*

**geometry**

Your edge count is wrong.
*January 29, 2010*

**geography**

6 ways the geography helped the civilization grow
*January 28, 2010*

**Geometry**

We put all possible combinations of p and q true and false in the table - there are 4 combinations. p q ~p^q 0 0 0 1 1 0 1 1
*January 27, 2010*

**math**

Ted put several different integers in order from least to greatest. He then put the same integers in order from greatest to least. Both times the same number was third in order. Explain how this is possible.
*January 25, 2010*

**geometry**

diameter 11cm
*January 25, 2010*

**college**

38.3/1.50
*January 14, 2010*

**History**

What does Jefferson mean by we must resort to manufacturing out
*January 12, 2010*

**Pre-Cal**

solve(5-x)^-3=8 teach if possibe if not, its ok Thanks
*January 10, 2010*

**Pre-Cal**

log base2 5 square root of 512 use the definition of b^1/n log base2 512^1/5 Not quite sure what to do after this Simplfiy.
*January 10, 2010*

**Pre-Cal**

Simplify e^3ln2-1
*January 9, 2010*

**chemistry**

What is the smallest volume of water at 20c that could be used to dissolve and remove potassium nitrate impurities and leave pure sodium hydrogen carbonate?
*January 6, 2010*

**Physics**

Please help ! Finish the following statement: "The greater the number of lines on a diffraction grating of a given size," a)the greater b)smaller then a)the range of wavelengths that can be diffracted b)the distance between the bright fringes produced
*January 6, 2010*

**Latin**

whats the translation of: "Tum amici Maximiservos laudaverunt et eis pecuniam donaverunt" and "Maximo singuli vale dixerunt" ?
*January 4, 2010*

**Functions (Math)**

it's compounded monthly though?
*January 2, 2010*

**Functions (Math)**

In the formula A=p(1+i)^n, I can not remember how to sub a value for "i" (interest) into the equation. For example, A $1000 investment is made in a trust fund that pays 12%/a compounded monthly. How long will it take the investment to grom to $5000? A- 5000 p- 1000 i...
*January 2, 2010*

**Pre Cal**

Find the exact value of the cosine and the cosecant of thetha, if thetha terminates in quadrant II and sin theta = 4/5
*December 23, 2009*

**Statistics**

The mean scores on the stats exam was 75 points with a standard deviation of 5 points and becks z score was -2. How many points did he score?
*December 17, 2009*

**Law & Ethics**

I am working on a research paper for a course I am taking thru Penn Foster. I have to answer several questions but I don't know if I am supposed to write the questions on the report, or just answer them ..you know..using the correct paragraph format; introductory sentence...
*December 7, 2009*

**Math- Please Help**

Decide which of the variables described is likely to have a normal or near-normal distribution. a. The salaries of adult males in a large city b. The weights of adult males in a large city
*December 5, 2009*

**Mathematics**

When two balanced dice are rolled, 36 equally likely outcomes are possible as shown below. (1, 1) (1, 2) (1, 3) (1, 4) (1, 5) (1, 6) (2, 1) (2, 2) (2, 3) (2, 4) (2, 5) (2, 6) (3, 1) (3, 2) (3, 3) (3, 4) (3, 5) (3, 6) (4, 1) (4, 2) (4, 3) (4, 4) (4, 5) (4, 6) (5, 1) (5, 2) (5, ...
*December 5, 2009*

**Math word problem**

I believe the answer would be 568. 994 divided by 7= 142 142*4= 568
*December 5, 2009*

**Math**

When a coin is tossed four times, sixteen equally likely outcomes are possible as shown below: HHHH HHHT HHTH HHTT HTHH HTHT HTTH HTTT THHH THHT THTH THTT TTHH TTHT TTTH TTTT Let X denote the total number of tails obtained in the four tosses. Find the probability distribution ...
*December 5, 2009*

**Math.**

solve (-5)x=3x-22 I"ve tryed all of the methods I have learned and still, when I put them in place of X it does not balance out. Please help.
*November 29, 2009*

**Math.**

I'm not understanding this problem soo much Solve -5x=3x-22
*November 29, 2009*

**Economics**

Am i on the right track U= f(x,y) 5= (10,4) + 40=(10,4) 2000 + 1600 No is the answer Why? No equal consumption
*November 29, 2009*

**Economics**

iF U-F(X.Y) Am I on the right track. i believe the answer is no, but I am not sure if the philosphy holds true. 50=(10,4) + 40= (10,4) 2000+1600 Am i going in the right direction?
*November 28, 2009*

**Economics**

Bridget has a limited income and consumes only wine and cheese; her current consumption choice is four bottles of wine and 10 pounds of cheese. The price of wine is $10 per bottle, and the price of cheese is $4 PER POUND.The last bottle of wine added 50 units to Bridget's ...
*November 28, 2009*

**Business**

True or false A recommended way of capitalizing on failure in a management experience is to reflect on what you would do differently in the furture? Is it true?
*November 24, 2009*

**Math**

A cyclist and a jogger start from a town at the same time and head for a destination 6 mi away. The rate of the cyclist is twice the rate of the jogger. The cyclist arrives 3 hr ahead of the jogger. find the rate of the cyclist. This is what i got so far but its not adding up...
*November 23, 2009*

**Spelling/ Language Arts**

unscramble word =ehwatr
*November 19, 2009*

**Geometry**

We're learning about classifying triangles with Side-Angle-Side, Angle-Side-Angle, etc. I'm kind of confused-- I have the definitions, but when I am shown a picture, I have trouble figuring out which it is. Could you please explain it or provide a link with a thorough ...
*November 18, 2009*

**maths**

what is the negation of: 'every boy has shoes' ?
*November 2, 2009*

**6th Grade Math**

A rectangular kitchen table is three times as long as it is wide.If it were 3 m shorter and 3 m wider it would be a square.What are the demensions of the rectangular table?
*October 28, 2009*

**MATH ~ Functions**

Can a graph cross an oblique asymptote? I tried to Google the answer to my question, but I can't find a site that gives me a detailed explanation. help. thank you.
*October 23, 2009*

**math**

True or False: |–8| + |3| = |–8 + 3|
*October 18, 2009*

**Chemistry**

How do I do this?? Calculate the pH at the equivalence point for the titration of 0.20 M aniline (C6H5NH2, Kb = 3.8 x 10-10) with 0.20 M HCl. [Hint: remember the dilution factor caused by addition of titrant to the aniline solution.]
*October 15, 2009*

**physics**

At her wedding, Jennifer lines up all the single females in a straight line away from her in preperation for the tossing of the bridal bouquet. She stands Kelly at 1.0 m, Kendra at 1.5 m, Mary at 2.0 m, Kristen at 2.5 m, and Lauren at 3.0 m. Jennifer turns around and tosses ...
*October 14, 2009*

**accounting**

I was given gross accounts receivable $15,200,000 and $17,600,000 respectively; allowance for uncollectible accounts at the begining and end of the year $1,400,000 and $1,550,000; expense for estimated uncollectible accouts $750,00 which was 1% of sales; no recoveries of ...
*October 14, 2009*

**Science**

If you tested bleach with an indicator, it would be a BASE with a high pH, because it is a very strong cleaning product.
*October 12, 2009*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.20 m/s2 until it reaches an altitude of 960 m. At that point its engines fail, and the rocket goes into ...
*October 10, 2009*

**physics**

An inquisitive physics student and mountain climber climbs a 50.0 m cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.08 m/s downward. (a) ...
*October 10, 2009*

**physics**

Nevermind! I got it: (a) What is the speed of the ball at the bottom of the first plane? v2 = vi2 + 2 a (x - xi) (b) How long doe is take to roll down the first plane? v = vi + a t (c) What is the acceleration along the second plane? v2 = vi2 + 2 a (x - xi) (d) What is the ...
*October 10, 2009*

**physics**

A ball starts from rest and accelerates at 0.520 m/s2 while moving down an inclined plane 9.65 m long. When it reaches the bottom, the ball rolls up another plane, where, after moving 14.40 m, it comes to rest. (a) What is the speed of the ball at the bottom of the first plane...
*October 10, 2009*

**Literature**

Can anyone PLEASE find me a short summary of these poems? the forsaken merman-matthew arnold the portrait- robert browning
*October 5, 2009*

**Chemistry**

Two successive reactions, D-->E and E-->F, have yields of 48% and 73%, respectively, What is the overall percent yield for conversation of D to F?
*September 29, 2009*

**Chemistry**

Two successive reactions, D-->E and E-->F, have yields of 48% and 73%, respectively, What is the overall percent yield for conversation of D to F?
*September 27, 2009*

**Chemistry**

Would the balanced equation for this be: B2H6(g)+ 3H2O(l)--> 2H3BO3(s)+ 3H2O(g)
*September 27, 2009*

**MATH**

EVALUATW (-8B)^2 AND -8B^2 WHEN B=10. (-8B^2)= -8B^2= SOLVE USING THE ADDITION PRINCIPLE. 3.8=S=0.1. THE SOLUTION IS S= THANK YOU
*September 27, 2009*

**MATH**

Translate to an algebraic expression. The product of 21% and some number. The translation is= Type the percentage as a decimal. use d to represent some number.
*September 26, 2009*

**Math**

4/-3+(5/-12)= Simplify your answer. Type a fraction.
*September 26, 2009*

**spanish 2**

*Estamos en Philadelphiao *No estamos listos. *Como esta usted?
*September 23, 2009*

**Physics**

A ball travels at 59.78 m/s for a distance of 16.45768956 meters, then decelerates at -89.67 m/s2 until is reaches a velocity of -89.67 m/s, then accelerates at 59.78 m/s2 until it reaches a velocity of 16.45758956 m/s, as shown in the graph to the right. What's the ...
*September 21, 2009*

**socio**

i'm talking about disparities like african americans having higher rates of hypertension or infant mortality or homicide
*September 13, 2009*

**socio**

what are the consequences of health disparities on everyone
*September 13, 2009*

**elementary**

What is the rule in math?
*September 9, 2009*

**Math**

[6x + 5]/3 = 3x/7 - 2 Please help.
*September 4, 2009*

**math**

Wait, I forgot / means division, I thought you needed to fill in the correct symbol
*September 2, 2009*

**math**

All you have to do on those problems is put an operation symbol in place of the / and see if it works
*September 2, 2009*

**english**

Thank you!
*September 2, 2009*

**english**

Analogies: 1) Worthwhile : Valuable :: A) Worthless : priceless B) Beneficial : Worthy *I think it's A* 2) Store : Supply :: A) Department : section B) Provision : dispensary C) Keep : Distribute D) Stockpile : Reserve *I have no idea what this one is*
*September 2, 2009*

**3rd grade**

Well, I have been out of 3rd grade for awhile, but i am in middle school:) I think Ali could use 6 hundreds, and 24 ones. Therefore turning the 2 tens into ones (2x10= 20) and adding the ones she already had (20+4=24) ~Hope I helped;)
*September 2, 2009*

**English**

Ask yourself what part of speech "two" is- both are completely different parts of speech, but one of your answers is right
*September 1, 2009*

**Financial Math**

Sales is 59250 with 100% what is cost of sales: ? with 31.97%, Gross profit : ? with ?%, Personnel Cost : 18486.00 with ?%, Expenses: ? with 10.21%, Direct Operating Profit: ? with ?% what are the values of (?)
*August 27, 2009*

**elementary math**

I say it's easier to multiply them because you keep the same denominator...i think
*August 22, 2009*

**physics**

part b is 31.87
*July 30, 2009*

**Algebra**

Limits? I don't get it?
*July 14, 2009*

**Algebra**

Determine the vertical asymptotes for the graph function: f(x) = 4/x+10 g(x) = x^4 + 2/x h(x) = x^2+4/x(x+5)(x-2) f(x) = x+5/x^2 +4x - 32
*July 14, 2009*

**science**

what are the protections that exist to safeguard and protect the galapagos islands?
*July 5, 2009*

**Algebra**

Please solve: a. 1/3 - 5/6 = 1/x b. t+1/3 - t-1/2 = 1
*June 30, 2009*

**Science/Geology**

Thank you!
*June 28, 2009*

**Science/Geology**

I feel like an idiot for even asking, however, here goes... I need to do a "graphical representation of mechanical and chemical weathering, water, wind, and ice erosion." I have read through my text numerous times and still am not sure how to do this. Does anyone ...
*June 28, 2009*