Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 245

**Chem**

Set up a Hess’s law cycle, and use the following information to calculate ΔH∘f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations. 3NO2(g)+H2O(l)→2HNO3(aq)+NO(g) ΔH∘ = -137.3 kJ 2NO(g)+O2(g)→...

**Physics**

An object with mass 8.5kg is moving vertically upward with a velocity if 35m/s at a height of 100m above the ground. Find the time the object takes to reach the ground Thanks!!

**Geometry**

A tree casts a 36 ft shadow. The angle of depression from the top of the tree to the tip of the shadow is 25°. Find the height of the tree to the nearest tenth.

**CHEM- need help ASAP**

An equilibrium mixture in a 10.0 L flask contains 7.0 mol HI(g) and 1.0 mol each of I2(g) and H2(g). If 2.5 mol H2, 5.0 mol I2 and 2.0 mol HI are added to that equilibrium mixture how many moles of each gas will be present when equilibrium is reestablished?

**Mathh**

What is the first natural number that is a perfect square and a perfect cube? Can you find the second? The third?

**Math**

Minnie is painting her walkin closet. Each gallon of paint covers 275 square feet. The closet is in the shape of a right rectangular prism. The floor is 9 feet wide and 7 feet long. The ceiling is 8 feet high. How many gallons of paint should Minnie buy to cover the four walls...

**Physics**

A motorist drives north for 33.0 minutes at 77.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h. a) What is his total displacement in km? b) What is his average velocity km/h?

**Chemistry**

5. On the basis of a solubility curve for KNO3 what type of substance would you expect KNO3 to be? Choices: solid liquid gas It is impossible to tell. I don't want the answer. All I want to know is, can you tell whether something is a liquid/solid/gas just by using a solub...

**Math**

A book that is 13 in. tall is leaning against the edge of a wall. If the bottom of the book is 5 inches from the wall, how far up the wall is the top of the book?

**physics**

Have a hoop (15kg) with a radius of 1.5m. Angular speed is 5 rad/s. What is the total KE possessed by the hoop? The hoop begins to climb an incline which is at a 15 degree angle. Measured along the incline, how far up the incline does it rool before stopping if the incline has...

**Chemistry**

Rank the following in terms of increasing ﬁrst ionization energy. 1. Na, Mg, N, O, F 2. F, N, O, Mg, N 3. F, O, N, Mg, Na 4. O, N, F, Na, Mg 5. Na, Mg, O, N, F

**Chemistry**

Suppose the solubility of PbCl2 (s) 5.6 x 10^-2 M. Calculate the ksp

**Statistics **

Two dice are tossed. What is the probability that the sum of both dice is a prime number? This is what I have so far Presuming two fair, 6-sided dice, each numbered 1 through 6: You can achieve one of the following results on any given roll: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12....

**math**

variable is the number of frag per 100 square meters population: number of frag per 100 square meters in the tara region its both quan and qual

**Trig**

The postal service places a limit of 84 inches on the combined lenght and girth (distance around) of a package to be sen parcel post. What Dimensions of a rectangular box with square cross-section will contain the largest volume that can be mailed?

**biology/chemistry**

Determine the net ATP production from one molecule of acetyl CoA through the citric acid cycle and taking the products through oxidative phosphorylation?

**BIOLOGY please help!!**

Negative allosteric effectors in the citric acicd cycle. Theres four: I have NADH and ATP What are the other two please help

**life orientation**

negligence, facades, carelessness, actions

**Net ATP please help!!!**

Determine the net ATP production? from one molecule of acetyl CoA through the citric acid cycle and taking the products through oxidative phosphorylation?

**Life oriention**

carinogens, toxens, weather

**biology help**

What are the regulatory enzymes regulated in the citric acid cycle?

**Math puzzle**

Make the number 500 by mathematically combining eight 4's. You may use addition, subtraction, multiplication and division. You may also "push" them together.(44)

**Algebra**

You put $1700 into an account at 8% per year compounded continuously. a) How long will it be until you have $2000? b) What is the doubling time for this money?

**Algebra**

You put $1700 into an account at 8% per year compounded continuously. a) How long will it be until you have $2000? b) What is the doubling time for this money?

**Algebra**

Connections Academy? LOL I really needed this :)

**College math **

Can someone please assist me The problem reads "use the rule of 78 to find the payoff amount for the loan paid in full before the date" Finance charge: $717 Total number of payments 41 Amount per payment $155 Remaining payments when paid in full 10 Please help. Thank...

**math**

What is Jared's favorite six-digit number if the ten digit is his favorite digit, the sum of the hundred thousand digit and the thousand digit in his number from the largest place value to the smallest place value are consecutive numbers?

**math**

Which would be more beneficial for someone (who intends on going to a university) to take senior year of high school: AP Statistics or AP Calculus?

**physics**

Find the position and velocity of a particle at t = 1.92 s if the particle is initially moving east at a speed of 18.4 m/s and experiences an acceleration of magnitude 3.96 m/s2, directed west.

**Math**

320 + 16x = x^2

**physics**

Bob can throw a 540 g rock with a speed of 26 m/s. He moves his hand forward 0.8 m while doing so. What is Bob's maximum power output as he throws the rock?

**physics**

Bob can throw a 540 g rock with a speed of 26 m/s. He moves his hand forward 0.8 m while doing so. What is Bob's maximum power output as he throws the rock?

**Physics- Elena please help!**

A massless spring of constant k =84.8 N/m is fixed on the left side of a level track. A block of mass m = 0.5 kg is pressed against the spring and compresses it a distance d, as in the figure below. The block (initially at rest) is then released and travels toward a circular l...

**Physics URGENT!!!**

: A massless spring of constant k =84.8 N/m is fixed on the left side of a level track. A block of mass m = 0.5 kg is pressed against the spring and compresses it a distance d, as in the figure below. The block (initially at rest) is then released and travels toward a circular...

**Financial accounting**

Laird Company sells coffee makers used in business offices. Its beginning inventory of coffee makers was 200 units at $41 per unit. During the year, Laird made two batch purchases of coffee makers. The first was a 295-unit purchase at $46 per unit; the second was a 380-unit pu...

**Horticulture**

The repeated node internode node pattern of construction is typical of what part of an angiosperm plant?

**Physics please help me :)**

If 3.4 mol of methane is heated so that the temperature of the gas increases 45 K while its pressure remains constant, how much heat is added to the gas?

**math**

how do I write 6y - 12 = -3x in standard form?

**Physics**

A child pushes a merry-go-round with a force of 55.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merry-go-round has a radius of 1.15 m, how much work does she do? The answer is not 51...

**PHYSICS**

A child pushes a merry-go-round with a force of 55.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merry-go-round has a radius of 1.15 m, how much work does she do? ? Please explain!

**math**

Find n if t(n) is approximately 10,832 in the geometric sequence with first term 83 and a common ration 1.07

**math**

Find a decimal approx for S (sub 15) in the geometric sequence with first term 83 and common ratio 1.07

**Chemistry**

I'm confused. I need help on this too. So in order for something to need an electroylytic cell, the one that plates onto the other has to be above the one it plates onto? Am I understanding this correctly?

**Probability**

a bag contains 9 red marbles and 4 blue marbles. how many clear marbles should be added to the bag so the probibility of drawing a red marble is 3/5?????

**science**

a box is dropped off a tall building. At what time after release is it falling 15 m/s?

**physics**

Consider two cars, a very large one like a Hummer (mass 5m) and a small one like a Mini Cooper (mass m), both starting at the same point race toward the edge of a cliff. Assume that each car is accelerated by a constant force (same size force on each car) to the edge of the cl...

**Science**

Is a medical diagnosis considered a theory or a hypothesis?

**Chem - Titration**

A 100.0-mL aliquot of 0.100 M diprotic acid H2A (pK1 = 4.00, pK2 = 8.00) was titrated with 1.00 m NaOH. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 10, 11, 15, 19, 20, and 22 mL

**Calculus**

How can I efficiently study for a Calculus test with 8 sections?

**physics**

how to solve proper time interval?Proper length? thank you:D

**german**

Write the conversation in present perfect tense: 1. das konzert/ euch/ gefallen/? 2. ja,/ die Band/ tolol/ spielen 3. was/ du/ machen/? 4. ich/ den ganzen Abend/ am Computer/ sitzen 5. du/ wiel/ fur deine Prufungen/ arbeiten/? 6. ich/ im Internet/ surfen

**geometry**

14/5=x/3

**Chemistry **

the specific heat of aluminum is 0.900 J/g degrees celsius. how much energy is required to heat 45.0g of aluminum from 20.0 degrees celsius to 50.0 degrees celsius. a. 2840 J b. 810 J c. 1220 J d. 2030 J

**Chemistry**

to heat 12.4g of water from 20.0 degrees celsius to 25.0 degrees celsius requires ? a. 259 J b. 1300 J c. 040 J d. 1050 J

**fin 301**

Why don't all firms issue commercial paper rather than borrow from banks.

**fin 301**

explain how risk is taken into account for a financial instrument.

**Math**

It says to multiply. 2y and 14x^5y ___ ______ 7x^2 y^5

**Math**

523.3 repeating rounded?

**Math Calculus**

Reini - How did you ended up getting x dx/dt + y dy/dt=0? my professor said something with a^2 + b^2 = c^2 then differentiate it so 2a(da/dt) + 2b(db/dt) = 2c(dc/dt) so a^2+b^2=c^2 a^2 + 6^2 = 30^2 so a=sqrt(864) then I differentiate let da/dt = 1 b = 6 c=30 2a(da/dt)+2b(db/dt...

**Math Calculus**

Reini - How did you ended up getting x dx/dt + y dy/dt=0? my professor said something with a^2 + b^2 = c^2 then differentiate it so 2a(da/dt) + 2b(db/dt) = 2c(dc/dt) so a^2+b^2=c^2 a^2 + 6^2 = 30^2 so a=sqrt(864) then I differentiate let da/dt = 1 b = 6 c=30 2a(da/dt)+2b(db/dt...

**Math Calculus**

The foot of a 30-foot ladder is being pulled away from a vertical wall at a rate of 1 foot per minute. When the top of the ladder is 6 feet from the ground, at what rate is the top of the ladder moving down the wall?

**GEOMETRY**

But it doesn't say what the apothem or the perimeter is so HOW do I find the length of A side????? The website didn't help at all.

**GEOMETRY**

IM GOING TO CRY!!!!!!!!!!!!!!!!

**GEOMETRY**

PLEASE HELP ME, I HAVE AN EXAM TOMORROW AND THIS THE ONLY QUESTION I HAVE. THE AREA OF A REGULAR HEXAGON IS 35 IN SQUARED. FIND THE LENGTH OF A SIDE. ROUND YOUR ANSWER TO THE NEAREST TENTH. I KNOW THE ANSWER IS 3.7 BUT I DON'T KNOW HOW TO GET IT!!

**Geometry**

The area of a regular hexagon is 35in.2. Find the length of the side.

**math**

A recent graduate's student loans total $13,000. If these loans are at 4.1%, compounded quarterly, for 9 years, what are the quarterly payments

**Algebra**

a roof rises 2.4 feet vertically and 7.3 feet horizontally. what is the grade of the roof?

**chemistry**

i hate chem at UT!

**calulas**

Find and identify the location of the extreme points of f(x)=8xln4x

**math**

Use a tangent function to estimate the grade resistance of a 2200-lb car travelling on a 2.4° grade. Round your answer to the nearest pound.

**math**

Use a tangent function to estimate the grade resistance of a 2200-lb car travelling on a 2.4° grade. Round your answer to the nearest pound.

**Math**

The only choices were A) 0, 1.571 B) -1.571, 0, 1.571 C) -1.369, 0, 1.369 D) 0, 1.369

**Spelling 7**

Try to create a catchy headline about a different animal. Consider using puns, sound devices, or other plays on words. Please can you help me I don't know how to do it.

**Language**

Thank you so much !

**Math (Trig)**

a ferris wheel has a radius of 10m and is one meter above the ground. If the ferris wheel makes 1 revolution every 20 seconds, write an equation that gives the height above the ground of a person on the ferris wheel as a function of time if that person starts (t=0) 1/8th of a ...

**chemistry **

If you wanted to hydrolyze 1 mole of PLA into 1 mole of sodium lactic acid, how many moles of sodium hydroxide would you need?

**chemistry **

What is the molar mass of one LA monomer?

**chemistry**

If you weighed 5.0 grams of PLA, how many moles of LA monomer residues do you have?

**science**

how much salt must I put into a 100mls of water to stop it freezing when left overnight in a home freezer

**Geometry**

How do you solve 3= 9 =6y x 2x+5 20

**math**

Prove that if p is a prime number and p is not equal to 3, then 3 divides p^2 + 2. (Hint: When p is divided by 3, the remainder is either 0,1, or 2. That is, for some integer k, p = 3k or p = 3k + 1 or p = 3k + 2.) I thought you might do three cases with the three values of p ...

**math**

Prove that if x and y are nonnegative real numbers, then (x+y)/2 ≥ sqrt(xy). Use the technique of working backward from the desired conclusion. Where in the proof do we use the fact that x and y are nonnegative?

**College Chemistry**

The radius of Xe is 1.3*10^-8 cm. A 100-mL flask is filled with Xe at a pressure of 1.4 atm and the temperature is 290 K. Calculate the fraction of the volume that is occupied by Xe atoms.

**math**

Translate the following English sentence into a symbolic sentence with quantifiers: Between any integer and any larger integer, there is a real number. (universe is real numbers)

**chemistry**

suppose you have two 1-L flasks one containing N2 at STP the other containg CH4 at STP how do these systems compare with respect to a)number of molecules B)density c)average kinetic energy of the molecules d)rate of effusion through a pinhole leak?

**math**

describe the relationships that can be formed from different ratios of similar figures.

**trig**

the terminal side of an angle theta in standard position coincides with the line y=5x and lies in quadrant 3. find the six trigonometric functions of theta.

**Calculus**

A particle moves along a line so that at any time t its position is given by x(t)=2(pi)t+cos(2(pi)t). Determine the particle's maximum velocity.

**Calculus**

A company is designing shipping crates and wants the volume of each crate to be 4 cubic feet, and the crate's base to be a square between 1 and 1.5 feet per side. If the material for the bottom costs $5, the sides $3 and the top $1 per square foot. What dimensions will giv...

**Calculus**

An isosceles triangle is to be drawn with its two equal sides of legth 10. What is the maximum possible area for the triangle? [Note: The area of a triangle is given by half the product of two sides with the sine of the included angle.]

**Calculus**

i promise you i didnt make that up, im not trying to scam ppl into giving me answers, i really wanna learn but i just dont wanna cost my grade in the process, if you understand what i mean

**Calculus**

im sorry, i just have so much other homework, im also failing calculus cause im not understanding but i have other stuff to worry bout, usually i would go to tutoring to get this done but he gave it to me last min cause i went to the hospital, im not looking for sempithy i kno...

**Calculus**

Mr. Phillips decides to have a completely fenced-in garden. It will be laid out so that one side is adjacent to his neighbor's property. The neighbor agrees to pay for half of that part of the fence which will border his property. The garden is to contain 432 square yards....

**HELP!! MATH**

A boater finds herself 4 miles fromm the nearest point on a straight shore line whech is 6 miles from a shoreside motel. She plans to row on shore and then walk to a motel. If she can walk at 3 mph, at what speed must she be able to row so that the quickest way to to the motel...

**Calculus**

What is the x-coordinate of the point on the curve y=e^x that is closest to the orgin?

**Calculus**

Find the minimum distance, measured horizontally, between the graphs of y=x and y=x^3

**calculus**

A long rectangular sheet of metal, 12 inches wide, is to be made into a rain gutter by turning up two sides so that they are perpendicular to the sheet. How many inches should be turned up to give the gutter its greatest capacity?

**algebra**

x^2+3x-12=0 I need to factor this and thought I knew how, but I can't figure this one out. Factors of 12 are 1,12; 2,6; 3,4 and when I subtract these I don't get the 3 I need for the 3x. Am I overlooking something? My other problems were easy, so I don't think this...

**6th Grade Math**

Estimation division. Problem: 28,622/921 My estimated problem: 27,000/900 Is this right?? If not, please explain. Thanks!

**Math**

ones: 5 Tens: 8