Saturday

December 20, 2014

December 20, 2014

Total # Posts: 145

**Physics**

gtrgrt
*December 17, 2014*

**Chemistry**

What would you do in order to solve this question: "The enthalpy of combustion for benzoic acid is -3223.6kj/mol. Use the values of the standard enthalpies of formation of liquid water and CO2 to calculate standard enthalpy of formation of benzoic acid."
*November 29, 2014*

**AP Physics**

A honeybee with a mass of 0.175 g lands on one end of a popsicle stick (Active Example 9-2). After sitting at rest for a moment, the bee runs toward the other end with a velocity 1.47 cm/s relative to the still water. What is the speed of the 5.20 g stick relative to the water...
*November 26, 2014*

**AP Physics**

Two people are standing on a 2.2-m-long platform, one at each end. The platform floats parallel to the ground on a cushion of air, like a hovercraft. One person throws a 6.0-kg ball to the other, who catches it. The ball travels nearly horizontally. Excluding the ball, the ...
*November 26, 2014*

**AP Physics**

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires the gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.013 kg, and its velocity is +725 m/s. Her mass (including the ...
*November 26, 2014*

**AP Physics**

A person stands in a stationary canoe and throws a 5.16-kg stone with a velocity of 7.75 m/s at an angle of 31.5° above the horizontal. The person and canoe have a combined mass of 105kg. Ignoring air resistance and effects of the water, find the horizontal recoil velocity...
*November 26, 2014*

**Physics**

In a running event, a sprinter does 4.1 ✕ 105 J of work and her internal energy decreases by 8.1 ✕ 105 J.
*November 23, 2014*

**alg 2 HELP**

Can someone help me show their work so I can see visual steps to work out these kinds of questions.
*November 12, 2014*

**alg 2**

The book asks to us the quadratic formula to solve for the equation. Can someone help with these examples: 1.) x^2+4x-2=0 2.) 2x^2 -5x-2=0 3.) x^2+2x=4x 4.) -6x^2 +3x+2=3 ______________________________________ There are more problems but I think I can figure it out once ...
*November 12, 2014*

**Algebra 2 HELP plz**

I need help asap. thx
*November 12, 2014*

**Algebra 2 HELP plz**

An object is launched upward with an initial velocity of 64 feet per second from a platform 80 feet high. 1.) Write a height model for the object. I wrote my model as .... h=-16t^2 +64t +80 2.) How many seconds until the maximum height is reached? I had 2 seconds as my answer ...
*November 12, 2014*

**college chemistry **

a 1.0kg sample of metal with a specific heat of 0.50KJ/Kg C is heated to 100.0C and then placed in a 50.0g sample of water at 20.0C . What is the final temperature of the metal and the water?
*September 30, 2014*

**Algebra III**

How do I determine the dimensions of the following matrix product? A 2x3 * B 3x5 ??
*September 6, 2014*

**algebra**

the distance s to school is 1/5 more than the distance c to the pool
*August 27, 2014*

**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 ...
*May 4, 2014*

**Help!**

B. Is the correct answer :)
*April 30, 2014*

**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?
*April 4, 2014*

**math**

well try to do 869 divided by 7
*March 11, 2014*

**math**

What are the answers to the middle school math with pizzazz book e page 29?
*December 4, 2013*

**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))
*May 30, 2013*

**nonlinear algebra**

thank you
*March 15, 2013*

**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
*March 15, 2013*

**math 83**

4.25 + 5.75 = 10 what kind of math are you doin because I might have done that incorrectly.
*February 23, 2013*

**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?
*February 23, 2013*

**math**

24 and 32
*February 23, 2013*

**algebra**

k=9 find half of 6x then square it
*February 23, 2013*

**pre-algebra**

none
*February 21, 2013*

**algebra **

What is the base of a parallelogram if the height is 18.6 inches and the area is 279 square inches
*February 12, 2013*

**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?
*February 8, 2013*

**math**

find the quotient of 488 and 8 by partitioning the dividend. show your work
*January 29, 2013*

**Physics**

Brian is right.
*January 23, 2013*

**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?
*November 3, 2012*

**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
*September 27, 2012*

**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
*September 27, 2012*

**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
*September 16, 2012*

**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...
*August 14, 2012*

**English**

How do I write a comparative essay utilizing the assigned theme for two books?
*August 4, 2012*

**math**

Write four arithmetic means between 35 and 98.
*May 2, 2012*

**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?
*April 19, 2012*

**psychology**

Evaluate effectiveness of goal setting and drive theories in explaining behaviors
*April 5, 2012*

**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?
*April 1, 2012*

**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?
*March 28, 2012*

**pre-calc**

find the equation of the circles described. tangent to 2x + 3y + 13 = 0 and 2x - 3y - 1 = 0 and contains (0,4)
*March 18, 2012*

**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 ...
*March 9, 2012*

**CHEMISTRY**

never mind you just subtract them and get 26.6 and that is the right answer! Thank you soo much!
*March 9, 2012*

**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?
*March 9, 2012*

**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 ...
*March 9, 2012*

**simple math question**

who is bigger 0.03 or 0?
*March 5, 2012*

**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 ...
*February 22, 2012*

**CHEMISTRY**

Oh gotcha! Thanks Dr Bob!!! :D I really appreciate it!
*February 18, 2012*

**CHEMISTRY**

So the order from highest to lowest is :Li3PO4, NH4Br, SnCl4,Li2SO4 .... please confirm the right answer.
*February 18, 2012*

**CHEMISTRY**

So how would i determine it...based on the van't Hoff factor?
*February 18, 2012*

**CHEMISTRY**

yeah i meant Li2SO4
*February 18, 2012*

**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.
*February 18, 2012*

**Chemistry**

I had this exact problem for my homework but different numbers. I got it right thanks
*February 18, 2012*

**Chemistry**

Thanks DrBob222! You are the best! :]
*February 18, 2012*

**chemistry**

7.How might this method of finding thickness of the aluminum be used in finding the size of the molecule?
*January 22, 2012*

**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.
*January 21, 2012*

**algebra**

If you had the problem C over 28 equals 49 over 16, what would the letter C be?
*January 18, 2012*

**math**

Wouldnt that be 85 feet below sea level?
*January 18, 2012*

**Algebra - Question about Answers**

Thanks
*December 17, 2011*

**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
*December 17, 2011*

**science**

is cinnamon ionic or covalent
*November 17, 2011*

**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?
*November 8, 2011*

**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?
*October 5, 2011*

**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? ...
*October 1, 2011*

**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...
*August 24, 2011*

**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 ...
*August 5, 2011*

**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.
*July 24, 2011*

**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
*June 12, 2011*

**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
*April 18, 2011*

**math review**

Thank you!
*April 12, 2011*

**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)
*April 12, 2011*

**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?
*April 11, 2011*

**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.
*March 31, 2011*

**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 ...
*March 31, 2011*

**Math**

Thank you so much for your help!
*March 21, 2011*

**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.
*March 21, 2011*

**7th grade Math **

Trying to figure out 19.4(x) = 306.52 (gotta find out what X is
*March 21, 2011*

**World History**

What is the diffrence between totalitarianism and Fascism? which countries in WW2 went to which between the two? what where thier goals?
*March 14, 2011*

**enviro science**

thanks so much.
*March 14, 2011*

**enviro science**

what are the benefits and the negatives of dams and resevoirs? how do they affect ecosystems if at all?
*March 14, 2011*

**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?
*March 14, 2011*

**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...
*March 14, 2011*

**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.
*March 14, 2011*

**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.
*March 14, 2011*

**math**

what is the greater common factor of 6/12 need all divisible numbers for both and put in lowest form as a fraction
*March 9, 2011*

**Math**

A $215 jacket is on sale for 35% off. Find the sale price.
*February 15, 2011*

**physics-ASAP**

The answerwould be C.
*February 13, 2011*

**math**

THANK YOU SOOOO MUCH. :)
*February 9, 2011*

**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.
*February 9, 2011*

**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 ...
*January 9, 2011*

**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 ...
*January 9, 2011*

**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
*January 9, 2011*

**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 ...
*January 9, 2011*

**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 ...
*January 3, 2011*

**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 ...
*January 2, 2011*

**chemistry**

ha ha doing the same problem right now
*December 21, 2010*

**trig**

How would i solve this equation in Radians: cosx + sinx = 0
*December 19, 2010*

**AP US History**

soo d?
*November 14, 2010*