Monday

March 30, 2015

March 30, 2015

Total # Posts: 2,584

**physics**

An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
*February 10, 2009*

**math**

1,000,000+245-4564+3984068568+45-21x75.5675x500,000 :]
*February 10, 2009*

**calculus**

Find a formula for the inverse of the function f(x) = (4 x-1)/(2x+3)
*February 10, 2009*

**calculus**

Find an equation of the tangent line to the following curve at the point (0, 4). xe^y+ye^x=4
*February 10, 2009*

**physics**

a 2390 kg car traveling to the west at 22.4 m/s slows down uniformly under a force of 8740 N to the east. (a) How much force would be required to cause the same acceleration on a car of mass 3140 kg? Answer in units N (b) How far would the car move before stopping? Answer in ...
*February 9, 2009*

**Physics**

A weight suspended from a spring is seen to bob up and down over a distance of 37 cm twice each second. What is frequency in units of Hz? What is the period in units of s.? What is the amplitude in units of cm?
*February 9, 2009*

**U.S.History**

in reference to your question about the Puritans. I believe the answer is B. The puritans came to America to set up a society without religious persecution
*February 9, 2009*

**english**

Excerpts from Walt Whitman’s Song of Myself Number 33 Space and Time! now I see it is true, what I guess'd at, What I guess'd when I loaf'd on the grass, What I guess'd while I lay alone in my bed, And again as I walk'd the beach under the paling stars...
*February 9, 2009*

**chemistry help**

how do you balance these chemical equations NH4)3PO4 + Mg (CH3COO)2 -> Mg3(PO4)2 + NH4CH3COO MoO3 + H2SO4 + Zn -> Mo2O3 + H2O + ZnSO4
*February 8, 2009*

**chemistry need help asap**

how do you balance these equations? Ag2O -> Ag + O2 C6H6 +O2 -> CO2 + H2O
*February 8, 2009*

**algebra**

5x=-2x-6
*February 7, 2009*

**english paper**

so basically i am "summarizing" all the different sources but i need to put it all at once...right?
*February 6, 2009*

**english paper**

Hello I have a quick question. I have to write an english paper on the recent issues in business. it says that "purpose in writing this report is to SYNTHESIZe current, reported information on a recent issue in bussiness" The reason why i have the work synthesize in ...
*February 6, 2009*

**poop**

i hate all of you
*February 5, 2009*

**math**

Farmer Brown had some animals. One-fourth were horses, one-half were cows, and the rest were pigs. He had 8 pigs. How many animals did he have altogether? I know you would get a common denominator for 1/4 and 1/2 which would be 4 so you would have 1/4+2/4= 3/4 and then take 4/...
*February 4, 2009*

**algebra**

Factor x^2+6x+5 and x^2+8x+15
*February 3, 2009*

**algebra**

Simplify x^2-16 and x^2-100
*February 3, 2009*

**english**

What information can you get from a poem?
*February 2, 2009*

**algebra II**

solve each equation. 5y-2(y+3)=4y
*February 2, 2009*

**algebra II**

Solve each a equation. 5x=-2x-6 -5y+7=-18
*February 2, 2009*

**analogies**

What is the analogy for South America: Brazil :: North America:
*February 2, 2009*

**math**

what is the greatest common factor of 106 and 320
*February 1, 2009*

**chemistry**

Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane. 2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) If 5.35 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield...
*February 1, 2009*

**calculus**

Compute the area of the region in the fi…rst quadrant bounded on the left by the curve y = sqrt(x), on the right by the curve y = 6 - x, and below by the curve y = 1.
*January 31, 2009*

**calculus**

Find the average value of the function on the given interval f(x) = 2x^3(1+x^2)^4, [0,2]
*January 31, 2009*

**calculus**

Consider the solid obtained by rotating the region bounded by the given curves about the line x = 6. y = sqrt(x), y = x Find the volume V of this solid.
*January 31, 2009*

**calculus**

Consider the solid obtained by rotating the region bounded by the given curves about the x-axis. y = 6 x^6 , y = 6 x , x >= 0 Find the volume V of this solid.
*January 30, 2009*

**science245**

In answer to your question yes these are some of the rudest people on the planet. I guess their brains are so huge with information that they do not have the capacity for compassion.
*January 27, 2009*

**algebra**

1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
*January 27, 2009*

**algebra**

The volume V of a gas varies inversely as the pressure P and directly as the temperature T. A certain gas has a volume of 20 L, and a temperature of 320 K, and a pressure of 1 atm. If the gas is compressed to a volume of 15 L and is heated to 330 K, what will the new pressure...
*January 27, 2009*

**algebra**

1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
*January 27, 2009*

**algebra**

Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
*January 26, 2009*

**math**

Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
*January 26, 2009*

**U.S.History**

yes that is the ansswer for sure. good job!
*January 25, 2009*

**algebra**

write in standard from: 8.36 x 10^5 and -6.43 x 10^-4
*January 25, 2009*

**algebra II**

f(x)=|x-2|-2
*January 25, 2009*

**math**

Can you tell me if this could be right? First take 10000x18=180,000 Second divide 180,000 by 12=15000 Third divide 15000by 5280= 2.84 which would round to 3 Please tell me if this could be right
*January 25, 2009*

**math**

would you not divide in the first step?
*January 25, 2009*

**math**

Suppose that humans walk about 10,000 steps perday on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How many feet per day do you walk? How many miles per day do you walk, to the nearest whole mile?
*January 25, 2009*

**math**

(6) Which equation is equivalent to 4^-x=8? a. log8 4=x b. logx = -4 c. log -x 4=8 d. log 4 8= -x
*January 23, 2009*

**algebra**

i think it is d
*January 23, 2009*

**algebra**

Which best describes the following function? f(x)=2^3.5x-7 a. exponential b. linear c.cubic d. quadratic
*January 23, 2009*

**math**

What is $600 invested at 9% interest, compounded quarterly, worth in 3 years? a. $640.50 b. $641 c.$762 d.$784
*January 23, 2009*

**algebra**

Solve the equation 10 x = 20 for x. a. x=1/2 b.x=2 c.x=1.3 d.x=10
*January 23, 2009*

**Math**

Suppose that humans walk about 10,000 steps per day on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How Many feet per day do you walk? How many miles per day do you walk, to the nearest whole number?
*January 23, 2009*

**physics**

How fast WAS it rolling on the table before it fell off. I don't think the height of the table (1.5m) or distance from table (.8m) are relavent to the problem. Is this a trick problem???
*January 20, 2009*

**physics**

A 72 g baseball rolls off a 1.5 m high table and strikes the floor a distance of .8 m away from table. How fast is it rolling on the table before it fell off?? Accel of gravity is 9.81 m/s2.
*January 20, 2009*

**physics**

so is it A B OR C
*January 20, 2009*

**physics**

A wheel of diameter 0.700 meters rolls without slipping. A point on the top of the wheel moves with a tangential speed of 2.00 m/s with respect to the ground. 1. If the wheel suddenly stops spinning and skis along the ground then a. v=rù b. v>rù c. v<r&...
*January 20, 2009*

**physics**

Calculate the speed at the edge of a disc of radius 8.5 cm that rotates at the rate of 4 rev/s. Answer should be in units of m/s Thanks
*January 20, 2009*

**physics**

a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post ...
*January 20, 2009*

**physics**

i am sorry but i don't get how to do it
*January 20, 2009*

**physics**

person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post on...
*January 20, 2009*

**chemistry**

Given the following reaction: 4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 2.46 moles of CO2 react completely? moles
*January 20, 2009*

**physics**

a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post ...
*January 20, 2009*

**phil**

1. the roosevelt corollary was first put into effect in a. dominican republic b. hawaii c. cuba d. puerto rico i think it is A
*January 19, 2009*

**history**

i don't get why it's not A
*January 19, 2009*

**history**

1.Which best describes the US foreign relations or policies for the entire 19th cnetury a. american foreign policy frequently became entwined in the issues raised by conflicts between european powers b. the united states maintained a small military and naval establishment ...
*January 19, 2009*

**physics**

A quarterback throws the football to a stationary receiver who is 18.3 m down the field. Football is thrown at an angle of 44.9 degrees to the ground. Acceleration is 9.81 m/s2. What initial spped must the quarterback throw ball to reach receiver and what is the highest point ...
*January 19, 2009*

**biology**

Suppose that for an organism, 2n=8. How many chromosomes do the organism's gametes contain?
*January 19, 2009*

**chem**

I have a problem i don't get... H3PO4+3NaOH -> 3H2O+Na3PO4 How many moles of Na3PO4 will be produced from 1.7 moles of NaOH in the presence of excess H3PO4?
*January 18, 2009*

**algebra II**

y=mx+b (x,y) You multiply x by m, the slope. You get to y by adding b. (2,-4) You multiply 2 (x) by -1/3 (m), the slope. You get to -4 (y) by adding -3.33 (b) = -10/3 Therefore, y=(-1/3)x-(10/3) The next one is done the same way.
*January 14, 2009*

**algebra II**

Find the equation of the line With a slope of 2/3 that goes through the point (4, 5) With a slope of (-1/3) that goes through the point (2, -4) With a slope of 3 that goes through the point (-5, -1)
*January 14, 2009*

**english**

i think so what do you say
*January 14, 2009*

**english**

but do he really admire his father
*January 14, 2009*

**english**

i think dislike
*January 14, 2009*

**english**

What is the speaker's attitude towards his father? Father My father knows the proper way The nation should be run; He tells us children every day Just what should now be done. He knows the way to fix the trusts, He has a simple plan; But if the furnace needs repairs, We ...
*January 14, 2009*

**business**

What is a microsoft surface? And how could I make it better?
*January 13, 2009*

**computer**

What is a microsoft surface? And how could I make it better?
*January 13, 2009*

**english**

Ozymandias I met a traveller from an antique land Who said: Two vast and trunkless legs of stone Stand in the desert…. Near them, on the sand, Half sunk, a shattered visage lies, whose frown, And wrinkled lip, and sneer of cold command, Tell that its sculptor well those ...
*January 13, 2009*

**english**

Ozymandias I met a traveller from an antique land Who said: Two vast and trunkless legs of stone Stand in the desert…. Near them, on the sand, Half sunk, a shattered visage lies, whose frown, And wrinkled lip, and sneer of cold command, Tell that its sculptor well those ...
*January 13, 2009*

**Algebra**

Sorry, I was thinking PERPENDICULAR to a vertical line, so the answer would NOT be 0 (a horizontal line), it would be undefined (another vertical line alongside the original vertical line).
*January 13, 2009*

**Algebra**

VERTICAL LINE: No slope (or "undefined" slope) HORIZONTAL LINE: Slope=0 (by the way, a vertical line is "undefined" because the formula used to find the slope, (y2-y1)/(x2-x1), has a denominator of 0 when the line is straight up and down, and you can NEVER ...
*January 13, 2009*

**chemistry**

Do polar and non-polar substances mix
*January 13, 2009*

**english**

Ozymandias I met a traveller from an antique land Who said: Two vast and trunkless legs of stone Stand in the desert…. Near them, on the sand, Half sunk, a shattered visage lies, whose frown, And wrinkled lip, and sneer of cold command, Tell that its sculptor...
*January 13, 2009*

**english**

3-- According to the poem, king Ozymandias had the following wordswritten on his statue: "Look on my works, ye Mighty, and despair!' What message was this meant to tell the people of his time long ago?
*January 13, 2009*

**english**

I met a traveller from an antique land Who said: Two vast and trunkless legs of stone Stand in the desert…. Near them, on the sand, Half sunk, a shattered visage lies, whose frown, And wrinkled lip, and sneer of cold command, Tell that its sculptor well those passions ...
*January 13, 2009*

**social studies**

what happened to buddhism in india
*January 12, 2009*

**social studies**

How did Buddha try to change the lives of people in India?
*January 12, 2009*

**chemistry**

Do polar and nonpolar substances mix?
*January 12, 2009*

**Chemistry**

Do I have to add c and h number together?
*January 12, 2009*

**Chemistry**

Calculate the electronegativity differences between the following atoms: 1.C-H 2.O-H 3.C-O
*January 12, 2009*

**music**

In which city did jazz take hold? Why?
*January 12, 2009*

**music**

What were the beginnings of music in America that developed into jazz?
*January 12, 2009*

**writing**

1. High school is the time when some students begin to look for part-time employment. What is a good part-time job for someone your age? Why would this job be appropriate for a teenager?
*January 11, 2009*

**Algebra II**

Maria and Zoe are taking Biology 105 but are in different classes. Maria's class has an average of 78% with a standard deviation of 5% on the midterm, whereas Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow ...
*January 10, 2009*

**Math - Quadratics**

well to start you take they first number and divide is by pi... thats all im givin ya
*January 8, 2009*

**Calc**

Let f be the function given by f(x)=2ln(x^2+3)-x with domain -3 is less than or equal to x which is less than or equal to 5 a) Find the x-coordinate of each relative maximum point and each relative minimum point of f. Justify your answer. b) Find the x-coordinate of each ...
*January 8, 2009*

**chemistry**

What mass of iron contains the same number of atoms as 70.05 g of nitrogen?
*January 8, 2009*

**6th grade**

Her success rate was 14% however you need to subtract 3 to the second power with a subponent of 15 + 67% of 98 and thats your answer its really esy. I am only in 4th grade and u in like junior high!!!! wow STUPID!!!
*January 6, 2009*

**chemistry**

where is the 0.3740 coming from
*January 5, 2009*

**math**

what is the distributive property
*January 4, 2009*

**Calculus**

find the tangent line, graph both of them
*January 4, 2009*

**CACULUS**

BUT MY MC ANSWERS FOR A IS NOT THERE... A)0 B)1 C)-14 D)-24 E)26 WTF??
*January 4, 2009*

**CACULUS**

I GOT MY ANSWER IS B=4 AND A=2 IS IT RIGHT??
*January 4, 2009*

**CACULUS**

If the function f(x) is differentiable and f(x)= {ax^3 + 6x, if x≤1 {bx^2 + 4, if x>1 then a = What do I do?? No idea what's going on..
*January 4, 2009*

**Algebra 1 Question**

50 - 10X = -9 -10X = -59 X = 59/10
*January 4, 2009*

**Algebra**

a(h^2-k^2)-b(k-h)
*January 2, 2009*

**Algebra**

49(a-b)^2-(c-d)^2
*January 2, 2009*

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