Friday

April 18, 2014

April 18, 2014

Total # Posts: 92

**Physict**

This question is similar to some on driver's-license exams: A car moving at 50 km/h skids 15 m with locked brakes. Show that with locked brakes at 150 km/h the car will skid 135 m.

**Physics**

2. Boxcar A, with mass of 1500 kg, is travelling at 25 m/s to the east. Boxcar B has a mass of 2000 kg, and is initially at rest. The box cars collide inelastically and move together after they get stuck. What is their combined velocity?

**Physics**

1. Car A, with mass of 1250 kg, is travelling at 30 m/s to the east. Car B is a truck with mass of 2000 kg, travelling to the west at 25 m/s. Assume these two vehicles experience an inelastic collision but do not stick together, and Car A goes off 10 m/s to the west. What will...

**Math**

taxi company has 31 drivers and now has 43 how to find the percentage increase or decrease.

**calculus area between three curves**

also help with Find c>0 such that the area of the region enclosed by the parabolas y=x^2-c^2 and y=c^2-x^2 is 430.

**calculus area between three curves**

find the area of the region for 2y=4sqrt(x) , y=3, and 2y+3x=7

**language arts**

What would a flow map look like on the book The Hunger Games?

**Math**

(5x+1)/7-(2x-6)/4>_-4

**Math**

Y=2x^2 ;(1,2) ,(3,18)

**Math**

5x/7+1/7-2x/4-6/4

**Math**

5x/7+1/7-2x/4-6/4

**Math**

5x+1/7 -2x-6/4

**logic**

what is the truth value of the sentence "P v ~ P"

**Physics**

A roller-coaster car is moving at 20.0 m/s along a straight horizontal track. What is its speed after climbing a 15.0 m hill?

**Chemistry**

Solution A is 2.40M. 20mLs of solution A is transferred to a 250mL volumetric flask and diliuted to volume with water. What is the concentration of the diluted solution?

**math**

(4x^3+5x^2-2x-1)-(3x^2+7x-4)

**math **

What is (-2)^2 What is (-2)^3

**algebra**

*simplifying rational expressions a. 6x+12/4-x b. 3x^2/12-2x

**algebra**

traveling fromchicago to kansas city is a 540 mile trip. A small plane, facing a headwind (going against the wind), took 9 hours to get to kansas city. on the return trip to chicago the plane had a tailwind ( going with the wind) and the trip took only 6 hours. What was the av...

**algebra**

A 40 inch board is cut into two pieces so that the shorter piece is two-thirds of the length of the longer piece. What are the lengths of the two cut pieces?

**algebra**

A: 7x+7y=-77 B: 20x-5y=-35

**Math**

In a right triangle, the middle angle is 12 more than twice the smallest angle. What are the measures of the smallest and middle angles?

**math**

jenny's company has two photocopying machines, one of which is older and slower than the other. In fact, the newer machine can put out four-thirds as many copies as the older machine in the same amount of time. If, while running at the same time, together they produce 560 ...

**math**

Roberto and Luisa Barron Lopez each work full time jobs, and Luisa's mother, Carmena, collects a monthly pension of $628. Between the three of them, their total household income is $4238 each month. If Luisa earns $1772, how much does Roberto earn each month?

**math**

on her first two math tests, Gracie has an average score of 86. If she got a score of 92 on the first test, what is her score on the second test?

**Macro Eco**

The belief that monetary policy can be effective in changing aggregate demand and that the money supply is the critical monetary variable is associated with: Answer a Modern Keynesians. b Monetarists. c Supply-side economists. d New classical economists.

**Chemistry**

In a coffee cup calorimeter, 50.00 mL of HNO3 (aq) and 50.00 mL of KOH(aq) were mixed. The temperature of the resultant solution increased 6.5 C. What is the Delta H of this reaction?

**trig**

What is cosx=1/2?

**Statistics/Chi Square**

I have a question to do in which the efficacy of a drug used to treat panic disorder is tested. Patients are given a placebo for one week and then the drug for one week, and the number of panic attacks is measured for each week. The data looks like this: Placebo Drug 0 0 2 1 0...

**Statistics**

For a math assignment we need to design a dice roll game with different expected values of winning. The game should require a player to make a bet on the sum of one roll of two dice. If the dice sum to that number, the player wins; otherwise, he loses. We need to create a fair...

**Linear Algebra**

Let W be the set of all polynomials p(t) in P3 such that p(0)=0. Show that W is a subsapce of P3 and find a basis.

**Math**

A cafe holds 300 coffee mugs. 175 of those coffee mugs do not have handles. Estimate the percent of mugs that have handles.

**SCIENCE**

Craig sees a glass with ice tea sitting on the table. He notices that there is a great deal of moisture on the outside of the glass and a puddle of water on the table. He asks his family what they think causes the water to form on the outside of the glass. This is what they sa...

**Geometryy**

given that sec theta = radical13/whole number 3, and csctheta<0 find sin theta using the 2different methods; 1)using the "x-y-r" definition 2) using identities only

**Geometry**

Use the special triangles to find the exact values of the following: 1) csc45degrees 2)sec30degrees 3)longest side of a 30-60-90 triangle if the side opposite the 60degree angle is 5radical3

**Physics**

17

**Calculus AB**

Let R be the region bounded by the graphs of y=sin(pi x) and y=(x^3)-4x, as shown in the figure above. (a) Find the area of R. (b) The horizontal line y=-2, x=2, x=-1. Write, but do not evaluate, an integral expression for the area.

**Chemistry**

What is the balanced equation of HClO4(aq)+Sr(OH)2(aq)

**algebra**

12x-6=9x

**math/ measurment**

What is the measure of the point angle for a star-shaped polygon with 8 points and a dent angle of 130 degrees? Is there a formula to figure this?

**math/probability**

I was on that line of thinking as well but there are four possible answers and that doesn't match any of them. The four possible answers are: A) 0.00000003 ; B) 0.1000 ; C) 0.00000025 ; and D) 0.00000028 I really want to understand how to work these problems but I am so lost.

**math/probability**

For some reason I can not get my head around probability. Please show me how to work the problem not just the answers. A class has 11 students who are to be assigned seating by lot. What is the probability that the students will be arranged in order from shortest to tallest? (...

**Math / Probability**

In a certian lottery, 4 differnt numbers between 1 and 11 inclusive are drawn. These are the winning numbers. A player selects 4 different numbers between 1 and 11. What is the probability that the player has all winning numbers?

**math**

find the volume of a tent having the shape of a rectangular solid of length 13 ft, width 12 ft, and heihght 8 ft topped by a rectangular pyramid of the same width and length with height 5 ft

**math**

how may polygon arrangments does a semi-regular tessellation have? a) exactly three, b) exactly two or three, c) exactly four, d) exactly two of four

**Math**

A standard deck of cards is made up of four suits with 13 cards in each suit (total of 52 cards). If we randomly sample five cards from a standard poker deck, find the probability that all five cards selected are clubs.

**Math **

Expected value = (20,000 x 0.7) - (3,000 x 0.3) 14,000 - 900 13100

**chemistry**

The answer is C).015 Find x through the quadratic equation x^2^ +(1.4E-3)x - (2.8E-5)=0

**Business Law**

Dale Emerson served as the chief financial officer for Reliant Electric Company, a distributor of electricity serving portions of Montana and North Dakota. Reliant was in the final stages of planning a takeover of Dakota Gasworks, Inc. a natural gas distributor that operated s...

**Calculus**

sed

**chem**

how do i write a balanced equation for the reaction for Calcium Carbide, CaC2, acetylene gas, C2H2, and calcium hydroxide, Ca(OH)2 are produced

**chem**

if you cann get 5candies for 7dollars, then how many candies will 33 dollars get you?

**4th grade**

65

**His115**

What political events and social viewpoints made a federal constitution and government essential?

**spanish**

*No, estoy cansado. *Donde esta la escuela? *Es muy romantico?

**spanish 2**

Mi musica favorita es hip hop. Or Mi musica favorita es el hip hop.

**spanish 2**

Because you are asking "Where are we?" and you would answer "We are". "We are" in spanish is Estamos.

**English 3**

I'm writing an essay comparing and contrasting two of Edgar Allan Poe's poems, "Annabel Lee" and "The Raven". I'll be comparing and contrasting the theme, rhyme scheme, irony and the use of figurative language. I have an idea of what I will be w...

**math**

What is the product of 65.5 ' 0.2?

**critical thinking**

This looks like hasty generlization

**critical thinking**

I know it is a statistical fallacy, and it represents a false causality, I just can't seem to pinpoint the specific fallacy.Thank you for your time and help. I appreciated it.

**critical thinking**

I am confused then, I originally thought it was an ad hominem...but then I moved to a smokescreen, but after reading a couple of inserts they did not make sense...I read the cite, and it (post hoc) defiantly does not fit. Maybe I am overanalyzing the definitions. When you say ...

**critical thinking**

Is it a proof surrogate(for rhetoric) and for fallacies is it a post hoc

**critical thinking**

I have 4 out of 50 questions left...I cannot figure out the last two rhetorical questions, or the last two fallacy questions. What type of rhetorical device are these? 1. Very little research has been done using properly matched groups with a control group, the gold standard o...

**Biochem**

Describe the one dehydration reaction in glycolysis. Include reactants, products, enzyme, and which step it is. I know that it is step 6 and I believe that the reaction uses glyceraldehyde-3-phosphate dehydrogenase to convert glyceraldehyde-3-phosphate into 1,3-bisphosphoglyce...

**physics**

Air streams horizontally past a small airplane's wings such that the speed is 70.0m/s over the top surface and 60.0m/s past the bottom surface. If the plane has a wing area of 16.2m^2 on the top and on the bottom, what is the net vertical force that the air exerts on the a...

**physics**

sorry repeat. not needed

**physics**

a solid aluminum ingot weighs 89N in the air. what is its volume? (b) the ingot is suspended from a rope and totally immersed in water. What is the tension in the rope?

**Physics**

a solid aluminum ingot weighs 89N in the air. what is its volume? (b) the ingot is suspended from a rope and totally immersed in water. What is the tension in the rope?

**science**

since the plants and animals are flooded by the saltwater, the presence of so much salt would put them in a "hypertonic" environment, meaning that there is more solute present (in this case salt) than water. Plants and animals have to have a certain balance of salt a...

**Physics**

For the radius it is supposed to be r^2. Would I use 10.0cm^2 or 5cm^2? and would I convert that value to meters? Also where did the 1.41s come from? Thank you

**Physics**

Four identical masses of 800kg each are placed at the corners of a square whose side length is 10.0cm. What is the net gravitational force (magnitude and direction) on one of the masses, due to the other three? I think I have to separate the four masses but I'm not sure ho...

**Physics**

In a Cavendish balance apparatus suppose that M1= 1.10Kg, M2= 25.0Kg, and the rod connecting the M1 pairs is 30.0cm long. If, in each pair, M1 and M2 are 12.0cm apart center-to-center, find (a) the net force and (b) the net torque (about the rotation axis) on the rotating part...

**Statistics**

X = 7 and SX2 = 21. A new variable Y is created by multiplying each X by 3. What are SY and SY2 equal to ? I do not understand.

**Chemistry**

How do you convert umol/m3 to umol/m2?

**Physics**

A 67.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are .800 and .460 respectively. A) what horizontal pushing force is required to just start the crate moving? B) What horizontal pushing force is required to slide the cra...

**accounting**

for each of the following items, give an example of a business transaction that has described effect on the accounting equation: Increase an asset and increase a liability. Increase one asset and decrease another asset. Decrease an asset and decrease owner's equity. Decrea...

**Trignonmetry**

Please find the exact values: Tan(-3p/4)= Sec(2p/3)= Csc(7p/4)= Cot(11p/6)= p=pie

**Trignonmetry**

Is there a formula to find the correct asymptotes on y=3cos(4x+p/2)-3 p=pie Now I know that answer is -p/8<x<3p/8 How do I find the asymptotes?

**english**

Is time, summer and winter concrete or abstract words?

**physics**

A woman finds the front windshield of her car covered with ice at -12.6°C. The ice has a thickness of 4.80 10-4 m, and the windshield has an area of 1.25 m2. The density of ice is 917 kg/m3. How much heat is required to melt the ice?

**English**

I need help identifying the main arguments in the essay as well as the supports used. I believe the thesis is: If children are taught their place in the environment they will look at other species with a sense of fellowship and community. I am also supposed to evaluate the sou...

**math: repost with corrections**

p. 942 #5 This is a three-part question: a. the graph y = f(x) in the xy-plane has parametrization x=x, y=f(x), and vector formula r(x) = xi + f(x)j. Use this to show that if f is twice-differentiable, then k(x) = ((absvalue f''(x))/[1+((f'(x))^2]^3/2 b. use the fo...

**math**

Hi This is a three-part question: a. the graph y = f(x) in the xy-plane has parametrization x=x, y=f(x), and vector formula r(x) = xi + f(x)j. Use this to show that if f is twice-differentiable, then ((absvalue f''(x))/[1+((f'(x))^2]^3/2 b. use the formula for k in...

**Cal**

circle x^2 +y^2 = 1. r(t) = (sint)i +(cost)j at both pi/4 and pi/2 Find velocity & acceleration Thx!

**social studies**

why was george washington important

**9the Grade Honours English**

I need info on Aphrodite,Apollo,Atalanta,Perseus,Cerberus and the Minotaur for my honors English class.I have to make a book about them two pages per person.Please help!!! The links in this previous response by SraJMcGin should give you all the information you need: http://www...

**Math**

The greater of two consecutive even integers is six less than twice the smaller. Find the integers. The greater of two consecutive even integers is six less than twice the smaller. Find the integers How about x + 2 = 2x - 6 almost .. it's x + (x+2)=2x-2

**Math**

The greater of two consecutive even integers is six less than twice the smaller. Find the integers. Let the smaller be x. That means that the larger is x+2. From your statement x+2=2x-6 Solve for x. I hope this helps. Thanks for asking.

**Science help please...**

Each element has a different set of energy levels. Use this fact to explain why the colour of the light emitted by an element in the gaseous stare is characteristic of the element? Ive read and researched Quantum physics for over a week now and i still dont understand this que...

**Science**

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the diameter of an oil molecu...

**pre-algebra**

Which is heavier, The Thrust SCC that is 54 ft long and weighs 7 tons or the Spirit of America that is 47 ft long and weighs 4 tons?? The numbers need to be put into an inequality equation! Unless you have not adequately stated your question, no equation is needed. The answer ...

Pages: **1**