Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 1,415

**math**

I'd go for "negative y-values are reflected in the x-axis", but my terminology may be out of date.

**Math**

Apart from the subject, that equation isn't going to peak for x > 0. I think you may have an error in the question.

**Math**

First, 5:00, 120 minutes, is right. You can do this without algebra. In fact, algebra would only complicate it. In the jargon, 120 is the lowest common multiple (LCM) of 40 and 60. That means that it's the smallest number that both divide into evenly. 40, 80, 120 60, 120 S...

**Physics - heat**

1 caloris is the amount of energy needed to raise the temp of 1g or water 1 degree. So if it raises 50g by 28 deg, that's how many calories? OK, so we know how many calories affected the water, but we are also told that the burning was only 40% efficient, which means that ...

**physics**

You're very welcome, Mary. Sometimes, just sometimes, a picture, or graph, or video, is worth much more than a thousand words.

**physics**

When the rivet goes in, let's say its length is L. As it cools, it shortens a little, so its length is now L-delta(L). But it's holding the two plates, so as it shortens, it pulls them together just a little, by the amount delta(L). What you're thinking is that its...

**physics**

Consider the amount of contraction in cooling - in _both_ directions. The cross-sectional contraction is a minor negative, but the rivet is much longer than its cross-section, so the contraction along its length is proportionally greater. And, remembering that the rivet is hol...

**Logarithums?**

I don't see why you have to convert it; they are indeed the same thing. I want to draw a graph for this, but I can't :-) In general, you can use the rule that ln(1/x) = -ln(x), so you can simply declare that and be done. I'll try to show an equivalence so it might ...

**science**

For more details, look up "Newton's law of universal gravitation" on Wikipedia, but the gist is that the force between the Earth and the Moon depends on the product of the masses divided by the square of the distance, and then thetre's a factor g that is cons...

**math**

I think this is not the full question?

**math**

The brackets mean that you need to add the 8 and the 7 first. 8 + 7 = 15. Now multiply that 15 by 3, and multiply that answer by 2.

**Algebra I**

Call the numbers A, B and C We know A + B + C = 147 We are told that: B = 2 A + 4 (two times the first number and add 4) and C = 3 A - 5 (five less than three times the first number) This is called substituting. Now we can substitute (2 A + 4) for B whenever we see it. Using t...

**Science**

What might be the differences between liquids in a mixture? They might have different... what? Boiling points? Freezing points? Density, which in liquids we often measure as specific gravity. If it's a mixture, the two liquids will very probably have different boiling poin...

**physics**

Sorry, missed your followup earlier. I get the numbers you do, but something is funny with the question. h = 3.40t^3 anything with a t^3 term isn't acceleration; it's jerk. Constant jerk, in fact, that would have the chopper well into outer space in 60 seconds! Sorry, ...

**physics**

How high is the chopper after 2.05 s? call it H H = 3.4 * 2.05^3 m Now from that height, it drops something. I assume we're not taking air resistance into account here, or the question would be much longer. I don't know how accurate the measuure your class uses for g, ...

**latin**

ad lib. is short for ad libitum meaning at will (more or less) et alia, shortened to et al. (et = and, alia = others) versus (against) gets cut to vs. (why is abbreviation such a long word? :-) Quod (which) vide (see) gets shortened to q.v. cf., short for confer, means compare...

**physics**

Assume the particle starts at x=0. What is the position after 2.3 s? x = (50 * 2.3) + (10 * 2.3^2) That's how far it has travelled in 2.3s From there the average velocity is easy, I think

**math**

Scientists and mathematicians tend to avoid pie charts, because humans have a harder time judging angles and areas than line lengths. The Wikipedia page on Pie_charts, which I just visited, shows examples of a pie chart with apparently equal-ish segments that show up as clearl...

**physics**

Is the question average speed? Assuming average speed, you must find total distance, then total time, then divide them Time is easy: 24 + 36 + 44 + 13 minutes So how far do you get driving 24.0 min at 63.0 km/h? 36.0 min at 45.0 km/h? 44.0 min at 49.0 km/h? 60 min at 63 kph wo...

**math**

How you present the pie chart is kind of up to you, unless you were given specific instructions. You could put the numbers of deaths, or the percentages, or both. Apparently I can't put a link here, but if you go to the Wikipedia page Pie_chart you will see typical examples.

**math**

The numbers are close, but not exact since for example alcohol is about 12.6 rather than 13, but yes, you've clearly got it - but be careful; those numbers are degrees, not percent Alcohol is about 3.5%, and that makes about 12.6 degrees of a circle

**math**

Ayup! 54120 total deaths 510 from murder will be represented by about 3.4 degrees of the circle

**math**

A useful approach is to take a simpler case Suppose there were just 5 by murders, 30 by accidents, and 65 by tobacco How many would all the deaths add up to? What proportion of all deaths would be by tobacco? So there were 100 deaths, 65 by tobacco So tobacco would be 65% of a...

**Technology**

What about the zipper? Always my favorite tech story. :-) Or the camera phone? Quite recent, and there's a great story about its invention, which you can find in several places.

**math**

Multiply both sides by d^2 F(d^2)=G(mM) Divide both sides by F (d^2)=G(mM)/F Now take the square root d = SQRT(G(mM)/F)

**math**

Well, you have a) one variable per entity, and they are b) discrete rather than continuous, and c) within a reasonable range; the largest is no more than 80 times as big as the smallest, so you won't go wrong with a simple linear graph - column or bar chart. If you had two...

**college**

If cashews cost $5.00 per pound and peanuts cost $1.50 per pound how do I write the formula to determine how many pound of cashews to mix with 30 pound of peanuts so that the mix will sell for $3.00 per pound.

**accounting**

The Landis Corporation had 2008 sales of $100 million. The balance sheet items that vary directly with sales and the profit margin are as follows: Cash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5% Accounts receivable. . . . . . . . . . . . . . . . . . ....

**math**

9/14divided by 15/28

**crt/205**

Controlling Irrational Fears After 9/11* We present this selection as an example of a fairly well-reasoned argumentative essay. There is more here than arguments—there’s some window dressing and you’ll probably find some slanters here and there as well. You shou...

**1st grade**

My room is a mess. Mom said, "I have to clean it now."

**1st grade**

My room is a mess. Mom said, "I have to clean it now."

**1st grade**

thanks

**1st grade**

friend

**1st grade**

one syllable inside, many, friend

**1st grade**

Let's plant a tree by Mr. Olsons fence. is that a sentence

**Science**

Which direction do meridians run and what do they measure?

**Physics**

The charge on the door must be electrically neutral. If the door were positively or negatively charged, the electrons in the balloon would be repelled from or attracted to the door, making the overall charge on the door side of the balloon negative or positive, and then the ba...

**calculus**

A rectangle has its base on the x-axis and its upper two vertices on the parabola y=12−x2 . What is the largest area that the rectangle can have

**calculus**

You are planning to make an open-top box from an 12 in by 12 in piece of cardboard by cutting congruent squares from the corners and folding up the sides. What are the dimensions (of the 3 sides) of the largest volume you can make this way?

**math help please**

There are 9 one-to-one correspondences possible (2 sets of 3, thus 3^2)

**History**

If the 13th, 14th, and 15th Amendments, which were passed almost 100 years earlier, guaranteed that African-Americans had the right to vote, why was legislation such as The Voting Rights Act of 1965 necessary? 1) States were passing laws that discouraged or disqualified Africa...

**History**

All of the following are examples of how a local jurisdiction may have tried to inhibit African-Americans from voting prior to the Voting Rights Act, except: Poll Taxes Literacy Tests Intimidation and Violence Skin Color Comparison Tests Is the answer poll taxes?

**math**

Evaluate: 3^2 + 2^2 x 5 - sqrt 25 over 8 - 4 / 2 + 2 I am confused on the order in which I solve this. Please help!

**Finance**

The market allocates capital to companies based on:

**Math**

y=2x+3 How do you find the inverse of this function? I know that you have to get the x by itself but i am not sure how.

**Engineering**

Can someone please help me with this problem? In order to reduce the material cost, an engineer decides to use a hybrid beam instead of an all-carbon fiber beam. Both beams have the same overall dimensions with rectangular cross-sections. The hybrid beam contains carbon fibers...

**crt 205**

Final Project

**Physics**

I have to design a laboratory activity to answer the question, "What is the relationship between the diameter of a circle and the area of the circle?" My teacher said to use a previous activity as a templete to help me. For the previous activity you had to find the ...

**physics**

As shown below, a bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length and negligible mass. What is the minimum value of v such that the pendulum bob will...

**English**

Can harrowed mean worried? In the dictionary, I'm only finding that it has to do with farming, but in the context I see it in, it looks like it'd mean worried.

**English**

What does the word innuendo mean in this context: the air is alive with chatter and laughter and casual innuendo. None of the dictionary definitions make sense.

**Trivia**

Unscramble these 5 letters to form a St. Patrick's Day term? FETSA

**chemistry**

its c3ho5

**7th grade science**

i did the same question its 20 60 120

**Composite Materials**

Thank you very much.

**Composite Materials**

Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and small piece of composite ...

**french**

what is government in french? thanks, you will help me with my dissertation greatly xx

**french with japanese**

what lives in a stable

**biology**

i've only got like ten minutes so if anyone knows please HELP.

**biology**

37-40 please

**biology**

h ttp://i726.photobucket. com/albums/ww263/fornss/b iology2.jpg?t=1234820797 (remove spaces)

**CACULUS**

dy/dx = (y-1)^2 cosπx There's a horizontal line with equation y=c that satisfies this differential equation. Find the value of c.

**Warren Hills**

How do I solve y-5=3x

**CACULUS- EXPONENTIAL GROWTH**

A population of animals in an ecological niche is growing in time so that it's rate of growth dp/dt is related to its current size by the differential equation dp/dt = 900/p^2. If time is measured in years and initially there are P(0) = 10 animals present, find the populat...

**spanish**

YOU USE THE PRETERITE, NOT THE IMPERFECT!!!! ERA SHOULD BE FUE!!!!!

**Macroeconomics**

Is the slope of the savings equivalent to the size of the multiplier

**Macroeconomics**

Would Interest on both government and corporate bonds would be included as part of interest income in determining the GNP by the income approach

**Precalc**

REMEMBER LOG BASE A X = Y!!!!! THAT IS THE RULE, NOW FIND THE LOG WITH WHAT I GAVE U IF U CANT FIND IT OUT TOO BAD, I AM NOT DOING UR HOMEWORK, BUT I CAN HELP U!!!

**CALCULUS**

THAT IS A VIRUS

**CALCULUS**

Find the x-coordinate of the absolute minimum of f(x) = x^3 - x^2 - x +1 on the interval [-2, 2] The function f(x) = x^3 - 2x^2 is increasing on which of the following intervals? a)x<0 only b)x>4/3 only 0<x<4/3 d)x<0 or x>4/3 e)x<0 or x>3/4

**7th grade**

features that define the performance of a system are called what?

**Calculus(Derivative of ln)**

I get everything, but I can't seem to crack this one out, only one I got problems on.. -sqrt[x^2 +1]/x + ln(x + sqrt[x^2 + 1])

**English help!!**

After selecting your quote, write a statement explaining your choice. Define your statement and discuss its importance to your life. Your statement must be at least half page in length. Express yourself!! This is my quote: I'm not lazy. I'm energy efficient. I am sorry...

**CALCULUS**

AN EQUATION OF THE LINE NORMAL TO THE GRAPH OF Y= SQRT[3X^2 + 2X] AT (2, 4) IS??

**economics**

RELATIVE DEMAND AND COMPETIVENESS OF US EXPORTS

**Walquist**

Geometry question. a Math riddle. What does a cat need to play baseball?

**Physics help!**

I need to know all of the equations for WORK problems (Physics). I'm not sure where to find them. if someone could help id appreciate it.

**Finance**

attempt an insight into- two of the most popular techniques of calculating or evaluating the profitability of a project, which are the internal rate of return (IRR) or its modified internal rate of return (MIRR).

**college**

With an equation p(X=x)=e to the-lambda *lambda to the x/x how do you isolate for lambda if you know p ?

**math**

1 kilometer =

**Math**

the 100,000th place

**Macro Economics**

I think it is false because the number of units purchased would have to change to stay at equilibrium level without creating a shortage?? I think?

**Macro Economics**

If supply increases and demand increases, the the price must drop while the number of units purchased may remain unchanged. T or F?

**Macro Economics**

If the price of Honda ATV's increased while the number sold increased, then what must have happened in the market?

**english**

What is the refrain in Sir Patrick Spens, the Wife of Ushers Well, and the Bonny Earl of Murray?

**English**

dropale

**algebra**

isolate x first by adding one to both sides you should get 3x=12 divide both sides by 3 to get x=4 then substitute and get (4)^2 + 4

**Java Help**

I am just starting out in programming. If someone could help me with these assignments, it would be greatly appreciated. "Write a Rectangle class. This class represents Rectangles. Each Rectange has the X and Y coordinates of its center point (as doubles) and its width an...

**Computer Science**

a constructor that takes X, Y, width, and height as arguments; : 2. a constructor that takes only width and height as arguments; : 3. a default constructor; : 4. a method setCenter that takes X and Y as arguments; : 5. a method setWidth that takes a width value; : 6. a method...

**Computer Science**

I need help with these assignments. "Write a program to read a list of exam scores (integers in the range 0 to 100) and to output the total number of grades and the number of grades in each letter-grade category (90 to 100 = A, 80 to 89 = B, 70 to 79 = C, 60 to 69 = D, an...

**year 7 science**

its albert not nikola tesla

**Health**

I need a free report

**Physics**

A 3.0 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 1.0 kg of water is raised 0.10 degree celsius. ...

**Physics**

A swimmer has 8.20 x 10^-4 m^3 of air in his lungs when he dives into a lake. Assuming the pressure of the air is 95 percent of the external pressure at all times, what is the volume of the air at a depth of 10.0 m? Assume that the atmospheric pressure at the surface is 1.013 ...

**PHYSICS**

A ball of mass 0.150kg is dropped from a height of 1.25m. It rebounds from the floor to reach a height of 0.960m. What impulse was given to the ball by the floor?

**Physics**

Why are the steam and ice points of water better fixed points for a thermometer than the temperature of a human body?

**Physics**

Which object in the following pair has greater total internal energy, assuming both objects in the pair are in thermal equilibrium? a 1kg block of ice at -25 degrees Celsius or seven 12g ice cubes at -25 degrees Celsius

**Statistics**

Can you please help with this question. The only thing that I have come up thus far is that I am using the z critical value because I am estimating a population proportion. Am I on the right track? An important issue facing Americans is the large number of medical malpractice ...

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