Friday

March 6, 2015

March 6, 2015

Total # Posts: 257

**chemistry **

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6365 J. What is the specific heat of the gas?
*February 23, 2015*

**chemistry**

In a constant-pressure calorimeter, 60.0 mL of 0.310 M Ba(OH)2 was added to 60.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 23.44 °C to 27.66 °C. If the solution has the same density and specific heat as water, what is ΔH ...
*February 23, 2015*

**Chemistry **

At constant volume, the heat of combustion of a particular compound is –3949.0 kJ/mol. When 1.331 g of this compound (molar mass = 141.44 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 3.837 °C. What is the...
*February 23, 2015*

**Chemistry **

A researcher studying the nutritional value of a new candy places a 5.80-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.93 °C. If the heat capacity of the calorimeter is 38.50 kJ·K–1, ...
*February 23, 2015*

**math**

Find the horizontal and vertical asymptotes of the curve. y = 2x^2+x−1/x^2+x−42 x=? (smaller x-value) x=? (larger x-value) y=?
*February 11, 2015*

**math**

Find the horizontal and vertical asymptotes of the curve. y = 4+x^4/x^2−x^4 x=? (smallest x-value) x=? x=? (largest x-value) y=?
*February 11, 2015*

**math**

Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x2 + 6x + 3.
*December 14, 2014*

**math**

express 96 meters in 4 seconds as a unit rate
*October 22, 2014*

**Math**

What number am I? When you devide me by 5, the remainder is 4. I have two digits that are odd. And the sum of my digits is 10
*September 9, 2014*

**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)→...
*June 17, 2014*

**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!!
*May 19, 2014*

**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.
*May 16, 2014*

**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?
*April 16, 2014*

**Mathh**

What is the first natural number that is a perfect square and a perfect cube? Can you find the second? The third?
*March 11, 2014*

**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...
*March 11, 2014*

**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?
*February 9, 2014*

**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 ...
*February 4, 2014*

**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?
*January 27, 2014*

**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...
*December 14, 2013*

**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
*November 20, 2013*

**biology**

idk
*July 13, 2013*

**Chemistry**

Suppose the solubility of PbCl2 (s) 5.6 x 10^-2 M. Calculate the ksp
*July 10, 2013*

**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...
*July 2, 2013*

**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
*June 8, 2013*

**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?
*May 12, 2013*

**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?
*April 17, 2013*

**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
*April 17, 2013*

**life orientation**

negligence, facades, carelessness, actions
*April 17, 2013*

**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?
*April 17, 2013*

**Life oriention**

carinogens, toxens, weather
*April 17, 2013*

**biology help**

What are the regulatory enzymes regulated in the citric acid cycle?
*April 16, 2013*

**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)
*March 29, 2013*

**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?
*March 27, 2013*

**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?
*March 27, 2013*

**Algebra**

Connections Academy? LOL I really needed this :)
*March 12, 2013*

**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. ...
*February 22, 2013*

**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?
*February 15, 2013*

**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?
*February 14, 2013*

**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.
*January 31, 2013*

**Math**

320 + 16x = x^2
*December 16, 2012*

**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?
*November 25, 2012*

**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?
*November 25, 2012*

**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 ...
*October 29, 2012*

**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...
*October 29, 2012*

**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 ...
*October 21, 2012*

**Horticulture**

The repeated node internode node pattern of construction is typical of what part of an angiosperm plant?
*September 12, 2012*

**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?
*June 23, 2012*

**math**

how do I write 6y - 12 = -3x in standard form?
*June 22, 2012*

**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 ...
*June 10, 2012*

**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!
*June 9, 2012*

**math**

Find n if t(n) is approximately 10,832 in the geometric sequence with first term 83 and a common ration 1.07
*May 23, 2012*

**math**

Find a decimal approx for S (sub 15) in the geometric sequence with first term 83 and common ratio 1.07
*May 22, 2012*

**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?
*May 3, 2012*

**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?????
*April 30, 2012*

**science**

a box is dropped off a tall building. At what time after release is it falling 15 m/s?
*April 13, 2012*

**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 ...
*February 15, 2012*

**Science**

Is a medical diagnosis considered a theory or a hypothesis?
*January 30, 2012*

**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
*January 23, 2012*

**Calculus**

How can I efficiently study for a Calculus test with 8 sections?
*January 17, 2012*

**physics**

how to solve proper time interval?Proper length? thank you:D
*December 15, 2011*

**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
*December 5, 2011*

**geometry**

14/5=x/3
*October 25, 2011*

**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
*October 16, 2011*

**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
*October 16, 2011*

**fin 301**

Why don't all firms issue commercial paper rather than borrow from banks.
*October 16, 2011*

**fin 301**

explain how risk is taken into account for a financial instrument.
*October 16, 2011*

**Math**

It says to multiply. 2y and 14x^5y ___ ______ 7x^2 y^5
*October 9, 2011*

**Math**

523.3 repeating rounded?
*August 25, 2011*

**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...
*July 8, 2011*

**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?
*July 8, 2011*

**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.
*May 25, 2011*

**GEOMETRY**

IM GOING TO CRY!!!!!!!!!!!!!!!!
*May 25, 2011*

**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!!
*May 25, 2011*

**Geometry**

The area of a regular hexagon is 35in.2. Find the length of the side.
*May 25, 2011*

**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
*May 1, 2011*

**chemistry**

1.68 × 10^3 kJ
*April 27, 2011*

**Algebra**

a roof rises 2.4 feet vertically and 7.3 feet horizontally. what is the grade of the roof?
*April 13, 2011*

**chemistry**

i hate chem at UT!
*April 9, 2011*

**calulas**

Find and identify the location of the extreme points of f(x)=8xln4x
*March 29, 2011*

**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.
*March 23, 2011*

**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.
*March 23, 2011*

**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
*March 23, 2011*

**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.
*February 28, 2011*

**Language**

Thank you so much !
*February 28, 2011*

**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 ...
*February 27, 2011*

**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?
*February 22, 2011*

**chemistry **

What is the molar mass of one LA monomer?
*February 22, 2011*

**chemistry**

If you weighed 5.0 grams of PLA, how many moles of LA monomer residues do you have?
*February 22, 2011*

**science**

how much salt must I put into a 100mls of water to stop it freezing when left overnight in a home freezer
*February 22, 2011*

**Geometry**

How do you solve 3= 9 =6y x 2x+5 20
*February 14, 2011*

**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 ...
*February 14, 2011*

**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?
*February 3, 2011*

**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.
*January 31, 2011*

**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)
*January 29, 2011*

**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?
*January 26, 2011*

**Physics**

no idea
*January 11, 2011*

**math**

describe the relationships that can be formed from different ratios of similar figures.
*January 9, 2011*

**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.
*November 29, 2010*

**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.
*November 15, 2010*

**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 ...
*November 15, 2010*