Sunday

January 25, 2015

January 25, 2015

Total # Posts: 6,433

**College Physics**

An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?
*January 24, 2015*

**Economics**

How can a trade deficit actually increase the productivity of an economy? 1. by causing people to save 2. by building up a large amount owed 3. by importing funds used for capital deepening 4. by importing goods for short–term use I think 1, can anyone verify?
*January 23, 2015*

**algebra**

Let X be a number. Translate the English phrase or sentence into a mathematical expression. Then evaluate the expression for X =8. The expression is ?
*January 22, 2015*

**statistics**

As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...
*January 21, 2015*

**math**

Solve, using linear combination. 5x + y = 2 4x + y = 4 Write your answer as an ordered pair or write "no solution" or "infinitely many solutions".
*January 21, 2015*

**economics**

1. A sudden escalation in medical costs for treatment of ischemic heart disease would immediately: Answer Benefit providers. Be passed on to consumers. Benefit insurance companies. Decrease insurance company profits in the short term. Decrease tax revenues to the federal ...
*January 17, 2015*

**Physics**

A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking? A. force and pressure ...
*January 15, 2015*

**Physics**

Chisel is a pivot point between the wire and a 2 cm distance between the pins and the hand is 10 cm F 50 Newton force How much is the mechanical advantage? How much is the forces acting on the wire?
*January 15, 2015*

**Chemistry**

A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?
*January 14, 2015*

**Science**

In the past, what makes someone or a group of people considered to be "unfit" members of society?
*January 13, 2015*

**Math**

Never mind I eventually found out how to solve it myself.
*January 13, 2015*

**Math**

Given f(x)=-2-3x-x^2 , find f(1+k)
*January 13, 2015*

**Science**

What features of Western culture help lead people to believe in their primacy over nature?
*January 11, 2015*

**Algebra 2**

Adults 5.00 Kids 3:50 240 tickets sold for 1140 How many adults? How many kids?
*January 11, 2015*

**PreCalc**

Thank you sooo much! But how can I solve the 5th degree one algebraically?
*January 10, 2015*

**PreCalc**

Can you guys also help me on this one? x^5 + 4x^4 -16x -16 < 0
*January 10, 2015*

**PreCalc**

Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.
*January 10, 2015*

**Math**

(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...
*January 9, 2015*

**quantitative methods**

a packing device is set to fill detergent powder packet with a mean weight of 5 kg . The standard deviation is known to be 0.01 kg. these are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and ...
*January 9, 2015*

**English**

What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? A) We should live our lives well to achieve everlasting happiness. B) Man learns his most important lessons and insights in the present, through direct experience. If I recall correctly ...
*January 8, 2015*

**physics**

P.S. I forgot to multiply by the .5 in the second to last step . It should read : d = 696 + .5 * 1140 m d = 1266 m
*January 8, 2015*

**physics**

d = V0 * t + 1/2 a t ** 2 where average acceleration a = (V1 - V0) / dt V0 = 58 m/s V1 = 153 m/s dt = 12 s a = (153-58)/12 m/(s*s) a = 7.9 m/(s*s) d = 58 * 12 m/s *s + .5 * 7.9 * (12 * 12) m/(s*s) * (s*s) d = 696 + 1140 m d = 1836 m
*January 8, 2015*

**Physics and Math**

P.S. forgot to take square root in time calculation. Should be t = .0007s so v = 100 - 40000 * .0007 * .0007 v = 100 - .02 v = 99.98 m /s
*January 8, 2015*

**Physics and Math**

v = V0 + a * t F = m * a s = .5 * a * t^2 where s = 0.01 m V0 = 100 m / s m = 0.5 kg F = 2000 kg m/(s^2) solving f=ma for a : a = f/m = -2000/0.05 m/(s^2) = -40000 m/(s^2) solving s = .5at^2 for t : 2s = at^2 2s/a = t^2 t = square root(2s/a) t=square root (2 * 0.01m) / -40000 ...
*January 8, 2015*

**physics**

v = V0 + a * t V0 = 0 a = 2.75 m/s^2 t = 3.00 s v = 0 + 2.75 * 3.00 m/s v = 8.25 m/s
*January 8, 2015*

**Science/earth**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
*January 6, 2015*

**Pre-Calc**

Yeah sorry, my bad. I must have plugged in the numbers wrong, since I just got 44.5 for my answer. You guys are right, Thanks so much Steve and Reiny for your help!
*January 4, 2015*

**Pre-Calc**

Sorry, I'll be more clear. The question already stated how high the ferris wheel is at t=8 seconds. The highest point the ferris wheel reaches is 63 feet and the time for that is 8 seconds. What I'm trying to find out is how high the ferris wheel is when t=5 seconds ...
*January 4, 2015*

**Pre-Calc**

when i plug in t=5, I get 62.99 feet, but isn't that the height when t=8 seconds?
*January 4, 2015*

**Pre-Calc**

A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how high in feet you will...
*January 4, 2015*

**Algebra 1**

x^4-9x^3-7x^2-8x+2 Divide by x^2+x+1 Thanks
*January 4, 2015*

**Algebra 1**

6x^3-3x^2+x-40 Divided by x-2
*January 4, 2015*

**Algebra**

The length of a rectangle is 8 ft less than three times the width, and the area of the rectangle is 35 ft2 . Find the dimensions of the rectangle.
*January 2, 2015*

**science**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
*December 29, 2014*

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...
*December 28, 2014*

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...
*December 28, 2014*

**math**

a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...
*December 28, 2014*

**Algebra**

Thank you.
*December 23, 2014*

**Algebra**

Thank you for your quick reply. Can you please share the work ? Guess work in math could land up in wrong spot.
*December 23, 2014*

**Algebra**

r^3-24r-5 / r-5 How to divide r^3-24r-5 / r-5 quickly with less steps ? Thanks
*December 23, 2014*

**Calculus**

If 3x^2+y^2=7 evaluate ((d^2)y)/(dx^2) when x=1 and y=2
*December 21, 2014*

**calculus**

use implicit differentiation to find y=(x+8)^(3x)
*December 21, 2014*

**Chem**

Sorry I wasn't clear. That was the answer I got. I think my sig figs wrong cause I don't see any with three.
*December 17, 2014*

**Chem**

I set it up just like that and got kelvins right but still got it wrong 301.15k for T1 258.15k for T2 Answer was 0.887
*December 17, 2014*

**Chem**

A pressurized can of whipping cream has an internal pressure of 1.035 atm at 28°C. If it is placed in a freezer at -15°C, what is the new value for its internal pressure?in atm
*December 17, 2014*

**calculus**

No idea where to start The cost in dollars of producing x units of a particular camera is C(x) = x2 - 10000. (10 points) Find the average rate of change of C with respect to x when the production level is changed from x = 100 to x = 101. Include units in your answer. Find the ...
*December 16, 2014*

**calculus**

so would the velocity be -29.4?
*December 16, 2014*

**calculus**

supposed to be a 4.9t^2+550
*December 16, 2014*

**calculus**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t2 + 550. What is the velocity of the ball after 3 seconds?
*December 16, 2014*

**Calculas**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t^2 + 550. What is the velocity of the ball after 3 seconds?
*December 16, 2014*

**Physics**

A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a maximum height of ____________?
*December 13, 2014*

**English**

Which diagram correctly represents this sentence? Andy teaches and plays the guitar
*December 13, 2014*

**PHYSICS**

X = Vo*t+ 1/2*a*t^2 solve for x
*December 11, 2014*

**English**

How does voice affect the credibility of a text?
*December 11, 2014*

**physics **

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
*December 9, 2014*

**physics **

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
*December 9, 2014*

**Chemistry**

How many liters of stomach acid (pH = 4.000) will be neutralized by a 1.50 g tablet of "Bicar", a commercial tablet which is 50% flavored and 50% NaHCO3? Note that: NaHCO3(s) --> Na+(aq) + HCO3-(aq) and: H+(aq) + HCO3-(aq) --> H20(l) + CO2(g) So far I've ...
*December 9, 2014*

**Math (Simplifying Fraction)**

(x^-1+4x^-2)/(1-16x^-2)
*December 8, 2014*

**mechanics**

what is coefficient of friction of a 25lb object resting on a horizontal surface that requires 10lbs to move?
*December 8, 2014*

**Chemistry; stoichiometry**

Thanks for the advice! I was still getting an odd theoretical yield but that was probably from the data we collected.
*December 7, 2014*

**Chemistry; stoichiometry**

Determine the theoretical yield of silver that is produced if the other product is Copper(II) Nitrate. Copper that reacted: 0.3180 This is what I had: 0.3180g Cu x 1mol Cu/63.5g Cu x 2mol Ag/1mol Cu x 107.87g Ag/1mol Ag = 1.079g Ag (Set up in factor label method)
*December 7, 2014*

**physics**

what impulse is needed to slow a 45kg object from 15m/s to 12m/s?
*December 6, 2014*

**physics**

steven throws a 3.5kg ball at a speed of 25m/s. what is the momentum of the ball? Please show work
*December 6, 2014*

**physics**

how many significant digits are in the following measurement 2.546m
*December 5, 2014*

**algebra**

how do you write the simplest polynomial function with the given zeros
*December 4, 2014*

**algebra**

how do you write simples polynomial function with the given zero 1-i and 2
*December 4, 2014*

**Chemical Biology**

Which fruits or vegetables or plants do not contain catalase enzyme?
*December 4, 2014*

**algebra**

how to you solve polynomial equation by factoring x^3 + 3x^2 - 9x = 27
*December 3, 2014*

**algebra**

solve polynomial equation by factoring x^4 +100 = 29x^2
*December 3, 2014*

**Language Art Novel**

ms. sue are you a stripper?
*December 3, 2014*

**algebra**

solve polynomial equation by factoring 2x^3 - 12x^2 = 32x - 192
*December 3, 2014*

**algebra**

how do you solve polynomial equation by factoring 3x^4 + 11x^3 = 4x^2
*December 2, 2014*

**physics**

how do you solve 3x^4 + 11x^3=4x^2
*December 2, 2014*

**Chemistry**

carbon dioxide has a henrys law constant of 3.4E-2 mol/l*atm what is the molar concentration of CO2 in water if the partial pressure of CO2 in air is .000387. i know i have to use S=Kh*P but that gives you soluability where do i go from here to find molar concentration of CO2 ...
*December 2, 2014*

**math**

need help please. the time required for one complete oscillation of a pendulum is called its period. if L is the length of the pendulum, then the period is given by P= 2 times pie multiplied by the square root of (L/g), where g is a constant called the acceleration due to ...
*December 2, 2014*

**algebra**

using long division (x^6 - 4x^5 -7x^3) / (2x^3)
*December 1, 2014*

**physics**

a 2.0-kg ball has a momentum of 25 kg*m/s. what is the ball's speed?
*December 1, 2014*

**physics**

a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of
*December 1, 2014*

**physics**

a net force of 100 newton's is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of
*December 1, 2014*

**Math 3371**

In a certain year, 26% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers who do not already have a checking account. (a) If TeenChex selects a random sample of 3,000 teenagers, what number of teenagers ...
*November 24, 2014*

**Business statistics **

Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...
*November 20, 2014*

**science**

The question is in reference to o2 canisters attached to space suites during space travel
*November 19, 2014*

**science**

What provides pure O2 for inhaling and canisters to collect CO2 CO2.
*November 19, 2014*

**Chemistry**

Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?
*November 18, 2014*

**Chemistry**

Neutralizing acids.
*November 16, 2014*

**Chemistry**

Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?
*November 16, 2014*

**calculus **

it costs 8 dollars to manufacture and distribute a backpack.If the backpack sell at x dollar each, the number sold , n, is given by n= 3/(x-8)+5(100-x) . Find the selling price that will maximize the profit.
*November 15, 2014*

**safety contest scramble**

Four words. First word (8 letters), second (6 letters) third (four letters) fourth word (9 letters). The letters are oneqplmeiuoraeectttnepsrivp. Any ideas?
*November 13, 2014*

**Physics **

A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg ...
*November 10, 2014*

**Physics**

Two masses ( 2.3 kg and 4.2 kg) connected by a massless rope hung over opposite ends of a frictionless pulley. Each mass is initially 1.50 m above the ground, and the top of the pulley is 6.5 m above the ground. What maximum height does the lighter object reach after the ...
*November 9, 2014*

**SCIENCE**

Hello
*November 9, 2014*

**Algebra**

A kayaker paddles upstream for 1.5 hours then turns his kayak around and returns to his tent in 1 hour. He travels 3 miles each way. What is the rate of the rivers current?
*November 8, 2014*

**Chemistry**

How many hydrogen bonds can each (i) water and (ii) ice molecule form?
*November 8, 2014*

**calculus**

find the derivative of y y= 2 (22x+31)^(3/2)+ arctan((22x+21)^(1/2))+ln(11x+16)-22x-30
*November 8, 2014*

**Calculus**

i didn't get what you did can you plzz help me again ?
*November 8, 2014*

**Chemistry**

Does the Hydrogen Bondings in ice form, break, and reform all the time, just like in water?
*November 7, 2014*

**Chemistry**

If 10 cm3 of ethanol is added to 10 cm3 of water, does the initial temperature of water change upon addition of ethanol?
*November 6, 2014*

**chemistry**

Use Table 9.4 to calculate an approximate enthalpy or heat of reaction for the combustion of one mole of methane gas (CH4) to form gaseous H2O and CO2. What Volume (in L) of methane is needed to produce 3287 kJ of heat for methane gas at 11 oC and 3.40 atm pressure?
*November 5, 2014*

**chemistry**

Using Table 9.4, calculate an approximate enthalpy (in kJ) for the reaction of 1.02 g gaseous methanol (CH3OH) in excess molecular oxygen to form gaseous carbon dioxide and gaseous water.
*November 5, 2014*

**chemistry**

A student obtained an average PV value of 42,000 in column (f) of the data table. If the syringe had been able to be adjusted to a volume of 35.0 mL, what would the pressure be inside the flask?
*November 5, 2014*

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