Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 131

**Chemistry**

Ethanol (C2H5OH) melts at -114 degrees Celsius. The enthalpy of fusion is 5.02 kj/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K, respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135 degrees Celsius to liquid ethanol at -50 ...

**Algebra**

DeSean throws a ball up with an initial vertical velocity of 30 feet per second from a platform that is at ground level. How long will the ball be in the air?

**math**

well try to do 869 divided by 7

**math**

What are the answers to the middle school math with pizzazz book e page 29?

**Math**

Can someone please help me with these two. What is the quotient (6-x)/(x^2+2x-3)÷(x^2-4x-12)/(x^2+4x+3) in simplified form? State any restrictions on the variable. Simplify the complex fraction ((x)/(x+2))/((1)/(x)+(1)/(x+2))

**nonlinear algebra**

thank you

**nonlinear algebra**

Use prime factorization to simplify the following square root leave as exact answer. How do you find the prime factors of this problem? 112 square root

**math 83**

4.25 + 5.75 = 10 what kind of math are you doin because I might have done that incorrectly.

**English**

If the sentence was: Ramai was so nervous that she had already dropped and ____ two dishes. What way would I write BREAK to make it fit into this sentence?

**math**

24 and 32

**algebra**

k=9 find half of 6x then square it

**pre-algebra**

none

**algebra **

What is the base of a parallelogram if the height is 18.6 inches and the area is 279 square inches

**chemistry**

Ethylene glycol (antifreeze) has a density of 1.11 {\rm g/cm^3}.What is the mass in G of 435mL of this liquid?

**math**

find the quotient of 488 and 8 by partitioning the dividend. show your work

**Physics**

Brian is right.

**algebra 1**

The perimeter of a triange with sides a,b,and c is 24 cm. Side a is 2cm longer than side b. The ration of the lenghts of sides b and c is 3:5. What are the lenghts of the three sides of the triangle?

**Math**

a poll found that a particular group of people read and average or 18.3 books per year. The pollsters are 99% confident that the result from this poll is off by fewer than 3.79 books from the actual average x. express this situation as an inequality involving absolute value

**physics**

two vectors A and B have magnitude such that A>B. We do not know the directions of the vectors. however we can say that the magnitude of the sum A+B must be between? a) B and 2A b)A and A+B c) A-B and A+B d) A-B and A e) B and A+B

**physics**

Two masses M1 = 3.00 kg and M2 = 7.50 kg are stacked on top of each other as shown in the figure. The static coefficient of friction between M1 and M2 is μs = 0.520. There is no friction between M2 and the surface below it

**American History**

For history, I have to discuss a topic similar to this one: Would you say women achieved more (as far as Level of freedom, interests, and political activism go) in the 1920's or in the 1960's? I'm torn between two decades (the 20's and 60's).... Because, in...

**English**

How do I write a comparative essay utilizing the assigned theme for two books?

**math**

Write four arithmetic means between 35 and 98.

**maths**

A triangle has side lengths in the ratio 3:4:5. I the perimeter of the triangle is 84 cm, what is the length of the shortest side?

**psychology**

Evaluate effectiveness of goal setting and drive theories in explaining behaviors

**algebra**

How do you find the height of a triangle with one side that is 8cm another side is 6cm and the base is 10cm?

**English ACT**

When you have a sentence like, "For the wedding we hired photagrapher James Murphy." would you put a comma after photographer or not?

**pre-calc**

find the equation of the circles described. tangent to 2x + 3y + 13 = 0 and 2x - 3y - 1 = 0 and contains (0,4)

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.832 H2S (g) <-- --> H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.121 atm in a closed container. what is the total pressure in the container at equilibrium? Please tell me how to do it a...

**CHEMISTRY**

never mind you just subtract them and get 26.6 and that is the right answer! Thank you soo much!

**CHEMISTRY**

"Do you know the 6.2 and 224 values are correct?" -yes these are correct. I did what u told me and got 20.4 but it marked me wrong? What should I do?

**CHEMISTRY**

Equilibrium Equation with Partial Pressures PCl3(g) +Cl2(g) <-> PCl5(g)? An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) has partial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr, respectively. A quantity of Cl2(g) is injected into the mixture, and the total p...

**simple math question**

who is bigger 0.03 or 0?

**math**

What is the rule for this sequence? 72 , 63 , 54 , 45 , 36 Each number in the sequence is 10 less than the previous number. Each number in the sequence is 9 less than the previous number. The sequence decreases by multiples of 9. First by 9, then 18, then 27, then 36. The seq...

**CHEMISTRY**

Oh gotcha! Thanks Dr Bob!!! :D I really appreciate it!

**CHEMISTRY**

So the order from highest to lowest is :Li3PO4, NH4Br, SnCl4,Li2SO4 .... please confirm the right answer.

**CHEMISTRY**

So how would i determine it...based on the van't Hoff factor?

**CHEMISTRY**

yeah i meant Li2SO4

**CHEMISTRY**

Assuming equal concentrations, rank these aqueous solutions by their freezing point: LiSO4, Li3PO4, SnCl4, NH4Br. (from highest freezing point to lowest freezing poinT) Thanks.

**Chemistry**

I had this exact problem for my homework but different numbers. I got it right thanks

**Chemistry**

Thanks DrBob222! You are the best! :]

**chemistry**

7.How might this method of finding thickness of the aluminum be used in finding the size of the molecule?

**chemistry**

one edge of a cube is measured and found to be 2.162 cm. An atom of copper is 0.2560 nm in diameter. how many atoms of copper are contained in the cube.

**algebra**

If you had the problem C over 28 equals 49 over 16, what would the letter C be?

**math**

Wouldnt that be 85 feet below sea level?

**Algebra - Question about Answers**

Thanks

**Algebra - Question about Answers**

I would like to know if my answers are correct. A principal of 6500.00 is invested in an account paying an annual rate of 4%. Find amount in acct after 4 years if acct is compounded semiannually, quarterly and monthly. Semiannually - 7615.79 Quarterly - 7621.76 Monthly-7613.64

**science**

is cinnamon ionic or covalent

**Algebra**

A stop sign has the shape of an octagon with each side measuring 0.5 ft. To make a scale model of the sign, every dimension is multiplied by 1/20. How is the ratio of the areas related to the ratio of the corresponding dimensions? What is the ration of the areas?

**math**

ms.goldfarb has 12 turqoise beads and 3 times as many amber beads. she is making 8 pins with the same number of beads on each pin. how many beads will be on a pin?

**physics**

The horizontal surface on which the block of mass 5.1 kg slides is frictionless. The force of 62 N acts on the block in a horizontal direction and the force of 124 N acts on the block at an angle of 60 degrees. What is the magnitude of the resulting acceleration of the block? ...

**Math**

What is 2 + 2? = 4 What is 2 * 2? = 4 So, the sum and the product of these two numbers is the same. Are there other numbers that have this same property? Yes Determine all number pairs x and y such that the product of x and y and the sum of x and y are equal. Make sure to show...

**algebra 2**

A player bumps a volleyball with an initial vertical velocity of 20 ft/s. The height of the ball can be model by the function h(t) = -16t2 + 20t + 4, where h is the height in feet and t is the time in seconds. a. What is the maximum height of the ball? ( use your graphing calc...

**math**

the perimeter of an isosceles triangle is 21 meters. the length of one side is 3 meters longer than the length of the other two sides. find the length of each side.

**physics**

The plane is flying horizonally at 40m/s at an altitude of 125 m when it drops a bomb. determine how far horizonally from the target you should release the bomb

**math**

scott bought two items at daves fruit market. the cashier told him that he owed $5.49. why is the cashier incorrect? what did scott purchase? DAVE'S FRUIT MARKET grapes $2.25/bag bananas $ 1.99/bag strwberries $3.40/box watermelon $5.00

**math review**

Thank you!

**math review**

50 student in school. 1 \ 10 of them are sick and at home. And 2 \ 3 of them are a field trip. How many of them are at school (fraction)

**math**

The ratio of the corresponding sides of two similar triangles is 3:2. The sides of the larger triangle are 15 cm, 24 cm, and 27 cm. What are the lengths of the sides of the smaller triangle?

**Algebra**

Write a radical for exact length of the diagonal of the 30 by 30 dance floor. simplify the radical. Im not sure how to do this.

**Math**

To allow for more dancers the country club can increase the dimensions of the dance floor in 5 foot increments in either direction ; however the committee would like to maintain a square shape. Let n represent the number of 5'increases to the length pf each side of the dan...

**Math**

Thank you so much for your help!

**Math**

A slide 2.6 m long makes an angle of 27° with the ground. How high is the top of the slide above the ground? Could someone show me how to solve this? I'm not sure where to begin.

**7th grade Math **

Trying to figure out 19.4(x) = 306.52 (gotta find out what X is

**World History**

What is the diffrence between totalitarianism and Fascism? which countries in WW2 went to which between the two? what where thier goals?

**enviro science**

thanks so much.

**enviro science**

what are the benefits and the negatives of dams and resevoirs? how do they affect ecosystems if at all?

**Algerbra**

its asking you to take the measurments u got for the first one and increase the dimensions by 5 foot increments while not changing the shape. thats pretty much what its telling you to do its not asking u a question. so can you help me out or no?

**Algerbra**

the minimum size of dance floor that the prom committee is considering is 30' by 30'. they assume that this size will allow 100 couples to be on the dance floor at once. how many square feet of dance space per couple does this size allow? to allow for more dancers, the...

**math**

its a next part of the original question. after u get the measurments for the first one ur supposed to add this to it is what im guessing.

**math**

to allow for more dancers the country club can increase the dimensions of the dance floor in 5 foot increments in either direction; however, the committee would like to maintaine a square shape.

**math**

what is the greater common factor of 6/12 need all divisible numbers for both and put in lowest form as a fraction

**Math**

A $215 jacket is on sale for 35% off. Find the sale price.

**math**

THANK YOU SOOOO MUCH. :)

**math**

The sum of the measures of the three angles of any triangle is 180°. In the illustration, the measure of 2 (angle 2) is 7° larger than the measure of 1. The measure of 3 is 31° larger than the measure of 2. Find each angle measure.

**physics**

A simple harmonic oscillator consists of a 1.1 kg block attached to a spring (k = 180 N/m). The block slides on a horizontal frictionless surface about the equilibrium point x = 0 with a total mechanical energy of 3.0 J. (a) What is the amplitude of the oscillation? (b) How ma...

**physics**

a physical pendulum consists of a uniform solid disk (of radius R = 42.0 cm) supported in a vertical plane by a pivot located a distance d = 13.0 cm from the center of the disk. The disk is displaced by a small angle and released. What is the period of the resulting simple har...

**physics**

for part a: is it the 2*PI*(1.7PI)/.46 OR IS IT 2*pi* (1.7pi/.46)? AND FOR PART B: DO YOU MULTIPLY THE AMPLITUDE BY (SQRT3)/2? AND I UNDERSTAND PART C

**physics**

The balance wheel of a watch oscillates with angular amplitude 1.7π rad and period 0.64 s. Find (a) the maximum angular speed of the wheel, (b) the angular speed of the wheel at displacement 1.7π/2 rad, and (c) the magnitude of the angular acceleration at displacemen...

**physics**

Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth REis 6370 km. (a) What is the ratio of th...

**physics**

Assume a planet is a uniform sphere of radius R that (somehow) has a narrow radial tunnel through its center. Also assume we can position an apple anywhere along the tunnel or outside the sphere. Let FR be the magnitude of the gravitational force on the apple when it is locate...

**chemistry**

ha ha doing the same problem right now

**trig**

How would i solve this equation in Radians: cosx + sinx = 0

**AP US History**

soo d?

**AP US History**

soo d?

**AP US History**

The South Carolina Crisis of 1832-1833 resulted in a. a clear victory for the federal government or d. unanimous support in South Carolina for nullification The following, except one, were important manifestations of anti-foreignism in the 1850's: a. the burnuing of Cathol...

**math**

Set up and Label the proportion Answer and round your answer to the nearest whole number. A 6 ft tall tent standing next to a cardboard box casts a 9 ft shadow. If the cardboard box casts a shadow that is 6 ft long then how tall is it?

**physics**

an object of 3 kg is dropped from 2m above the ground. it takes a time interval of tE to reach the ground of the earth. if it is dropped on the moon, how long does it take to reach the ground? the a dure to g on the moon is 1/6 of that on the earth.

**Human Geography-Help!**

Yeah, and by stages I mean the stages of the demographic transition. I'm feeling pretty confident though, so it's alright.

**Human Geography-Help!**

Where is the largest concentration of people? East Asia If the physiological density is higher than the arithmetic density what can you infer? There's too many people for resources. What stage of the demographic transition has a rapidly delcining crude death rate? stage 2 ...

**Math**

I don't understand the question. I'm drawing a diagram but it's not making any sense to me. Is the answer 12?

**Math**

Well I found the perimeter by adding 24, 24, 12 and 12. Which is 72. Then I divided by 3. Which got me to 24. So I think it's right.

**Math**

Ranchers in Sweetwater, Texas hold a rattlesnake round up each year. The ranchers decide to build a cage 24 ft by 12 ft to hold the snakes. They place poles to support the cage 3 ft apart around the perimeter. How many poles are needed? -24 poles. But I'm not too confident...

**English**

Thank you!

**English**

True or False. The first-person narrator may slant the presentation of events. -True Is the narrator always the voice of the author? -No, because the narrator could be anyone. Am I right?

**psychology**

you like to play the violon, but doing so in front of people makes you nervous and you make mistakes, what is influencing your playing?

**music**

i think the answer is b. percussion

**music**

twentieth-century music features more _____ instruments than music of other periods a. string b. percussion c. woodwind d. brass

**music**

i think the answer is a. countertone

**music**

the term ___ describes intervals of less than a half step a. countertone b. microtone c. overtone d. undertone