Saturday

September 5, 2015
Total # Posts: 6,780

**chem ! help its killing me to :/**

1.If the pressure of the gas in a 2.31 L balloon is 0.120 atm and the volume increases to 7.14 L, what will be the final pressure of the air within the balloon? Round to the nearest hundredth. Don't forget the units. 2.At a pressure of 2 atm, hydrogen gas occupies a volume...
*May 23, 2013*

**Chemistry**

Do the properties of a newly formed chemical compound tend to differ from or be the same as the properties of the individual elements that compose it?
*May 21, 2013*

**math**

The probability of an event is 20%. how many times should you expect the event to occur in the given number of trials? 1.15 trials 2. 40 trials 3. 75 trials 4. 120 trials
*May 20, 2013*

**physics **

A tennis ball with a speed of 12.5 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 11.4 m/s. If the ball is in contact with the wall for 0.0139 s, what is the average acceleration of the ball while it ...
*May 20, 2013*

**physics**

An automobile and train move together along parallel paths at 20.3 m/s. The automobile then undergoes a uniform acceleration of −4 m/s2 because of a red light and comes to rest. It remains at rest for 19.4 s, then accelerates back to a speed of 20.3 m/s at a rate of 1.95...
*May 20, 2013*

**English**

I urgently need someone to check this summary of O. Wilde's The nightingale and the rose. Thank you very much in advance. 1) Oscar Wilde's work titled "The Nightingale and the Rose" is a fairytale. Wilde begins the fairytale with a central character who is a ...
*May 20, 2013*

**Math**

ABCD is a parallelogram. E is a point on DC extended, such that D and E are on opposite sides of BC. Let AE intersect BC and BD at F and G, respectively. If AG=180 and FG=108, what is EF?
*May 20, 2013*

**math:vertex,axis of symmetry,min/max,**

How do i find the vertex,axis of symmetry,min/max value? a) x^2-9x+y+20 b) f(x)=-5/4x^2+5/28x-5/114 c) f(x)=5x^2+x+4
*May 19, 2013*

** Quadratic equations from standard to factored **

Standard to factored form? a)y=x^2+7x+10 b)y=2x^2-x-3 c)y=x^2-9
*May 19, 2013*

**Film**

Which of the following is true of the screenwriter’s role in making movies? (Points : 1) A film begins with a writer’s story Film is generally considered a writer’s medium The writer is more important than the rest of the cast and crew Writing scripts is an ...
*May 19, 2013*

**math**

120
*May 19, 2013*

**math**

SE=9.5 chance=30%
*May 19, 2013*

**math**

1.50% 2.82%
*May 19, 2013*

**math**

a boy walks 2 miles east from his home ans then turns south and walks an additional 1.5 mile. how far is he from his home?
*May 19, 2013*

**math**

a boy walks 2 miles east from his home ans then turns south and walks an additional 1.5 mile. how far is he from his home?
*May 19, 2013*

**math**

the height of a soccer goal is 0.5 feet more than one third of its width. if the area of this goal is 117ft^2, find the width of the goal
*May 19, 2013*

**math**

What is 1250 divided by 23???
*May 18, 2013*

**Multiplication**

what is 1250* 2987??
*May 18, 2013*

**statistics**

A)red, red, blue, blue, green, green 1, 1, 0, 0, 0, 0 1, 1, -1, -1, 0, 0 B)red, red, blue, blue, green, green red, red, blue, blue, 0, 0 1, 1, -1, -1, 0, 0 C)0 D)7.303
*May 18, 2013*

**physics**

A human cannonball is launched from a cannon at 26.4 m/s at 20.4 degrees above the horizontal. (Assume he/she lands in a net the same height as the cannon.) How high in the air does he/she go?
*May 16, 2013*

**math**

A baker measured the length of different loaves of bread. The interquartile range of a data set was 12 inches. Which statement is also true for the data set?
*May 16, 2013*

**Geometry**

Let S be the set of {(1,1),(1,−1),(−1,1)} -lattice path which begin at (1,1) , do not use the same vertex twice, and never touch either the x -axis or the y -axis. Determine the largest value of n such that every path in S which ends at (n,n) has length at most ...
*May 16, 2013*

**Geometry**

Let A be a convex 61− gon. We then place n points {x i} n i=1 in the interior of A . What is the minimum number n , such that the interior of any triangle, whose vertices are also vertices of A , will contain at least one of the points xi?
*May 16, 2013*

**Physics**

A frog is jumping around its pond. At some time t , the frog is in mid-jump and has a kinetic energy of 1 J and a momentum of magnitude 0.5 kg⋅m/s . What is the mass of the frog in kg?
*May 15, 2013*

**chemistry**

a balloon has a volume of 456 mL at a pressure of 1.0 atm. it is taken under water in a submarine to depth. where the air pressure in the submarine is 3.3 atm. what is the volume of the balloon? assume constant temperature?
*May 15, 2013*

**math**

1. change to improper fraction: 9 5/9 2. change to improper fraction: 6 23/39 3. change the improper fraction to a whole number:115/20 4. multiply 4 3/4 x 1 1/7 5,subtract- 20 11/15- 17 1/3 6 2(-6)(-8)(0)(-5): multiply 7. solve for the variable: 0.1p=7
*May 14, 2013*

**Geaometry (Graph)**

16
*May 13, 2013*

**math**

how do i change 9 5/9 to an improper fraction
*May 13, 2013*

**physics**

Name of physics book for 11 and 12.to catch engineering exam and other competetive exam
*May 13, 2013*

**science**

A form of energy that is always transferred from a warmer substance to a cooler one.
*May 12, 2013*

**Philosophy**

Since Jessica’s participation in local politics increased significantly after she joined her school’s political science club, it is clear that her involvement in that club led her to take an interest in politics. The argument above is flawed because
*May 12, 2013*

**math**

write as an equivalent decimal or a decimal approximation. 4 12/19
*May 12, 2013*

**pre alg**

if the slope of a line is 8/4, do we simplify it to 2? or does it stay at 8/4?
*May 9, 2013*

**pre alg**

16.5 ft tall thank u
*May 9, 2013*

**pre alg**

jane is standing next to a tree. the tree casts a shadow that is 11.2 ft long. she is 5.6 ft tall and her shadow measures 3.8 ft. How tall is the tree?
*May 9, 2013*

**pre alg**

thank u
*May 9, 2013*

**pre alg**

a 9 ft ladder is leaning against a wall so that Adam can hang a picture 7.5 ft above the floor. how far does the ladder need to be placed from the wall?
*May 9, 2013*

**Physics**

In a series AC circuit, R=20(ohms), Xl=10(ohms), and Xc=25(ohms), where the frequency is 400 Hz. Find the resonant frequency of the circuit.
*May 6, 2013*

**maths**

7^4=2401, thats the answer
*May 6, 2013*

**Math (algebra)**

The answer is 439
*May 6, 2013*

**chemistry**

DrBob222 i need the solution of this numerical problem step by step please
*May 5, 2013*

**chemistry**

a 35.0ml sample of 37% hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013*

**chemistry**

37 % hcl solution
*May 5, 2013*

**chemistry**

a 35.0ml sample of 37 hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013*

**Analytic Geometry**

What is the equation of the circle touching the lines x-3y-11=0 and 3x-y-9=0 having its center on the line x+2y+19=0 .
*May 5, 2013*

**Geometry**

Parallelogram ABCD has ÚABC=x ∘ and ÚBCD=2x ∘ +111 ∘ . What is the value of x ?
*May 4, 2013*

**Algebra**

If the ratio of x+y to x−y is 11/4, then the ratio of y to x can be written as a/b where a and b are coprime positive integers. Find a+b .
*May 4, 2013*

**science**

What is heat energy? Where does it come from, and what are its properties? Include in your discussion the following terms: molecules, conduction, convection, and radiation.
*May 2, 2013*

**algebra**

Cryptic Quiz 1. What do you call a skydiver with the flu? 2. How do you crash a houseboat party?
*May 2, 2013*

**physics**

Two cars collide head on and stick together. The one moving East was going 20.00 m x sec-1 and had a mass of 1500.0 kg. The one heading West was going 25.00 m x sec-1 and had a mass of 1000.0kg. I n which direction were the two cars moving and how fast were they moving?
*May 2, 2013*

**statistics**

Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a light rail mass transit system in Denver If Linda wants to be 90 percent Confident that her sample estimate of the proportion of voters who favor the bond is within 2 percent of the ...
*May 2, 2013*

**physics**

A projectile was fired out of a lead ejector at an angle of 45 degrees up from horizontal. The projectile velocity was 1000.00 meters per second. How high did it go? and how far did the projectile go?
*May 2, 2013*

**Calculus**

Consider the lamina ( with uniform density .01m) having the shape of the region Q in the xy-plane: 1≤x^2+y^2≤4. The density at each point P varies directly with the distance from P to the origin, with density at the point P(2,0,0) being 10kg/m3.Find the polar ...
*May 2, 2013*

**Math-calculus**

Evaluate ∫∫ln(x^2+y^2)/sqrt(x^2+y^2) dA where 1≤x^2 +y^2≤e
*May 2, 2013*

**English**

Can someone correct these questions, please? Thank you very much in advance. 1) Briefly outline the features of the 18th-century novel focussing on the type of narrator, the hero and the time and place setting. 2) Analyze the structure of Swift's Gulliver's Travels ...
*May 1, 2013*

**Analytic Geometry**

What is the equation of a circle passing through (-4,-4) and tangent to the line 2x-3y+9=0 at (-3,1)?
*April 30, 2013*

**accounting 206**

asasas
*April 29, 2013*

**Chemistry**

What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3 with 25.00 mL of 0.10 M NH4Cl? Assume that the volume of the solutions are additive and that Kb= 1.8 × 10-5 for NH3.
*April 29, 2013*

**business math**

One-ninth of Polymer Plastics’ sales are made in New England. If New England sales amount to $600,000, what are the total sales of the company? (Points : 2)
*April 28, 2013*

**physis**

A ball of mass 80kg falls from rest from a height of 100m.neglecting air resistance, calculate it K.E after falling a distance of 30cm
*April 28, 2013*

**Physics**

The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0% of its length. What is the tension in the guy wire? Link to picture of problem which is needed to solve the problem...
*April 28, 2013*

**Physics**

The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0 of its length. What is the tension in the guy wire? Link to picture of problem which is needed to solve the problem...
*April 27, 2013*

**Physics**

Add com after tinypic
*April 27, 2013*

**Physics**

The boom weighs 2450 and is attached to a friction less pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 39.0 of its length. Picture Link: tinypic./view.php?pic=53qp3m&s=5 What is the tension in the guy wire?
*April 27, 2013*

**Chemistry**

Calculate the percent ionization of 0.140 M lactic acid in a solution containing 8.5×10−3 M sodium lactate.
*April 27, 2013*

**economics**

hi new to economics, and struggling with some of its concepts. got this posed as a homework question, and i have to admit stumped as how to begin. Suppose a firm finds that the marginal product of capital is 60 and the marginal product of labor is 20. If the price of capital ...
*April 26, 2013*

**Physics**

I need the formulas for Q5 , Q6 and Q7
*April 26, 2013*

**Math**

Math Problem: Find the area of a circle that has a radius of 14 feet. Round your answer to the nearest hundredth. Would someone please check the way I worked this and let me know if I did it correct or not? Thank You A=3.14 (14ft)2 A=3.14 (196) A=615.44 Im thinking I didn'...
*April 26, 2013*

**statistics**

out of ten questions two students got 8 wrong find out probability if they are cheating
*April 25, 2013*

**Math**

How do you find the length of the base of a triangle? My math problem is: The area of a triangle is 33.6 inches. If the height is 4 inches what is the length of the base? thank you
*April 25, 2013*

**A.P. Chemistry**

Thorium-232 undergoes alpha decay and has a half-life of 1.4 * 10^10 years. How long will it take for a 1.00mg sample of thorium-232 to be reduced to 0.5mg?
*April 25, 2013*

**chemistry**

A 33.0g sample of nitrogen, N2 has a volume of 42.0L and a pressure of 640.mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?
*April 24, 2013*

**Public Speaking**

when speaking about abstracts concepts, make them concrete to the audience by?
*April 24, 2013*

**physics**

A standard man climbs 10 m up a vertical rope. How much energy in calories is dissipated as heat in a single climb if 20% of the total energy required is used to do the work?
*April 24, 2013*

**Math**

Compare the areas of two rectangular regions if the length of one rectangular region is double that of the other, and the width is triple that of the other. (Use an algebraic formula.)
*April 24, 2013*

**Biology**

you are studying a single-gene locus with two alleles in a population that is in Hardy-Weinberg equilibrium. Examination of a large sample of individuals from the population reveals there are six times as many heterozygotes as there are homozygote recessive individuals in this...
*April 23, 2013*

**biology**

In a natural population of outbreeding plants, the variance of the total number of seeds per plant is 16. From the natural population, 20 plants are taken into the laboratory and developed into separate true-breeding lines by self-fertilization—with selection for high, ...
*April 23, 2013*

**maths**

the frst term of AP is 4 and the last term is 79.given that the sum of the AP is 996, find the number of terms and the commmon difference.
*April 23, 2013*

**Health**

What physical changes do individuals encounter at the first stage of stress (alarm)?
*April 22, 2013*

**Health**

Can you please Analyze the health impacts of the second stage of stress (Resistance?
*April 22, 2013*

**english**

write your points for or against the motin which states that 'excessive self confidence is indisputably a boon and not a bone .750 words
*April 22, 2013*

**maths**

In an AP the first term is 2 and the nth term is 29 and the sum of the n term is 155 find n
*April 22, 2013*

**physics**

suppose that there are 1.9*10^25 stars in the universe. how many moles of stars would this be?
*April 22, 2013*

**physics 70**

d) F = ma (in the 'y' direction) *ball at bottom mean 'T' is upward and 'mg' is downward* T - mg = ma T - mg = m(v^2/r) (r(T - mg))/m = v^2 v = sqrt((r(T - mg))/m) v = sqrt((.85(22.5 - (.275*9.8))/.275) v = 7.82 m/s
*April 21, 2013*

**physics 70**

c) F = ma (in the 'y' direction) *ball at top means 'T' and 'mg' are pointing "downward"* -T -mg = ma -T = mg + ma T = -mg -ma T = -m(g + v^2/r) T = -.275(9.8 + (5.20^2/.85)) T = -11.4 N, or, 11.4 N downward
*April 21, 2013*

**Chemistry**

Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 4.00*10^2 mL of solution and then titrate the solution with 0.138 M NaOH. C6H5CO2H(aq) + OH-(aq) C6H5CO2-(aq) + H2O(l) Find concentration of Na+ at equivalence point.
*April 21, 2013*

**Chemistry**

Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
*April 21, 2013*

**Chemistry**

Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
*April 21, 2013*

**Physics**

1. Ohm's Law states that for some circuits the voltage is proportional to the current. In other words, if you double the voltage, you will double the current. Which of these equations agrees with this statement of Ohm's Law? (∝ means "is proportional to"...
*April 18, 2013*

**Statistics**

The design tolerance thickness for an automotive part is 55mm to 65mm. If the process mean thickness is 61mm with a standard deviation of 2.3mm, then what percentage of the sheets will be acceptable?(What percentage will fall within the design tolerence?) Assume that the ...
*April 18, 2013*

**News opinion a**

- The driver of an Okaloosa County EMS ambulance passed out before he caused a five-vehicle crash at Mary Esther Cut-Off and Wright Parkway on Tuesday evening, according to police. David M. Keller, 40, of Baker, was talking with his partner as he drove the ambulance south on ...
*April 18, 2013*

**finance**

. Fargo Industries has outstanding 30 year bonds at 7% semiannual payments. The bond sells at 90% of its face value. If their tax rate is 22%: a.What is the aftertax cost of debt? b. What is the pretax cost of debt? c. Which is more important in calculating the cost of capital...
*April 17, 2013*

**science**

If 1.38 g of steam at 100.0°C condenses into 38.6 g of water, initially at 27.6°C, in an insulated container, what is the final temperature of the entire water sample? Assume no loss of heat into the surroundings. °C
*April 16, 2013*

**statistic**

A sample of 59 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25 years. The population variance is 19. (a) Give a point estimate for μ. (Give your answer correct to one decimal place.)
*April 16, 2013*

**Physics**

he equation of a transverse wave on a string is y = (4.8 mm) sin[(14 m-1)x + (440 s-1)t] The tension in the string is 10 N. (a) What is the wave speed? (b) Find the linear density of this string.
*April 16, 2013*

**Help with statistics**

how u came up with 2.61 and 1.54
*April 16, 2013*

**english**

With in sentence should town also be capitalized? The town of Blair, Nebraska, is home to Dana College.
*April 16, 2013*

**English**

Can someone check these questions, please? Thank you in advance In Shelley's Frankenstein, what are the traits that remind us of a Gothic novel? 2)Discuss the concepts of beauty and youth as portrayed by Lord Henry in chapter 2 of O. Wilde's The Picture of Dorian Gray...
*April 15, 2013*

**Livingston High**

61/3 =
*April 15, 2013*

**Math**

The mean time to complete a certain stat quiz is 25 minutes, with a standard deviation of 5 minutes. Find the probability of a student taking. 1.) less than 15 minutes. 2.) Between 15 and 25 minutes. 3.)more than 25 minutes.
*April 14, 2013*