Saturday

May 30, 2015

May 30, 2015

Total # Posts: 1,751

**chemistry**

Calculate the volume of natural gas (methane) required to bring 2.6 L of water to a boil. Assume the initial temperature of the water is 21 C, and the methane is at 1 bar and 25 C. Assume that methane is an ideal gas, the specific heat capacity of water to be constant and ...
*December 4, 2011*

**Thermochemistry**

Hint: Write the balanced combustion reaction. You can find the standard enthalpies of formation for O2, CO2, and H2O from many sources, including the CRC Handbook of Chemistry and Physics. Solution: Balanced combustion reaction: C8H18 + 12.5 O2 --> 8 CO2 + 9 H2O From the ...
*December 4, 2011*

**Physics**

Pam has a mass of 44.0 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 22.0 m and Pam acquires a speed of 58.0 m/s.
*December 1, 2011*

**Science 7R (Lab questions) **

Animal cells lack in a cell wall. Plant cells have it.
*December 1, 2011*

**trig**

pi/3 is 7 square root 3/ 2 pi is - 7 square root 3 / 2 and 7pi/6 is -7
*November 29, 2011*

**trig**

i didn't realize it was just plugging in! thanks! i just need to figure out how to subtract fractions with pi in them now
*November 29, 2011*

**trig**

For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x,y). y=7cos(x-pi/6) for x=pi/6, pi/3, 2pi/3, pi, 7pi/6
*November 29, 2011*

**chemistry**

Which of the following sets of solute and solvents will make a homogeneous solution? (naphthalene is a non-polar organic molecule) 1. Water and benzene 2. Benzene and ammonium nitrate 3. Benzene and naphthalene 4. Water and naphthalene
*November 29, 2011*

**chemistry**

What is the molecular geometry for SH2? 1. Bent 2. Trigonal planar 3. Tetrahedral 4. Liner
*November 29, 2011*

**chemistry**

What volume of a 7.00 M solution of Ca(OH)2 is needed to neutralize 37.2 mL of a 3 M solution of nitric acid? 1. 15.9 mL 2. 37.2 mL 3. 7.97 mL 4. 24.2 mL
*November 29, 2011*

**chemistry**

What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL) 1. 31.1 % 2. 24.5 % 3. 23.7 % 4. 19.7 %
*November 29, 2011*

**chemistry**

How many moles of NaOH are in 23.5 mL of a 1.50 M solution? 1. 0.0353 moles 2. 35.26 moles 3. 16.7 moles 4. 0.0235 moles
*November 29, 2011*

**chemistry**

What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL
*November 29, 2011*

**calculus**

Let f''(x)=5x+5 with f'(2)=1 and f(-2)=2. Find f'(x) and f(3)?
*November 28, 2011*

**calculus**

Consider the function whose second derivative is f''(x)=7x+6sin(x). If f(0)=2 and f'(0)=3 , find f(x) .
*November 28, 2011*

**MATH HELP! **

if f(x)+(x-3)^4(2x-1)^3, find the value(s) of x which solve f'(x)=0
*November 28, 2011*

**Physics**

A great white shark with a mass of 3000 kg swimming at 3.00 m/s swallows a 250 kg fish at rest. What is the speed of the great white shark right after swallowing the fish?
*November 28, 2011*

**MATH**

if f(x)=(x-3)^4(2x+1)^3 find the value(s) of x which solve f'(x)=0
*November 27, 2011*

**MATH**

Complete the indefinite integral: ∫(x^2+1)^2 dx
*November 26, 2011*

**SCIENCE**

the brachialis is a short stout muscle inserting cloes to the fulcrum of the elbow joint' the brachioradialis is a slender muscle inserting distally, well way from the fulcrum of the elbow joint. Which is a mechanical advantage and which is a disadvantage
*November 22, 2011*

**anatomy**

In the body, lever systems involve the interaction of __1__, which provide the force, and __2__, which provide the lever arms. The force is exerted where __3__. The site at which movement occurs in each case is the intervening __4__, which acts as a fulcrum. 1. muscles? 2. ...
*November 22, 2011*

**ANATOMY**

place the following in order (1-11): Myosin heads bind to active sites on actin molecules ATP is hydrolyzed Myosin heads return to their high-energy shape(******), ready for the next working stroke Calcium ions bind to troponin Cycling continues until calcium ions are ...
*November 15, 2011*

**MATH**

Find the value of A + B if the A is the first term and B is the common difference of the sequence whose 4th term is 3 and 20th term is 35
*November 7, 2011*

**MATH HELP! **

find all possible values of the common ratio of the geometric sequence a, b, 6, ... if a+b=1
*November 7, 2011*

**Physics**

A wire is frictionless between points A and B and rough between B and C. A is 5m above the ground, B is zero, and C is 2m above the ground. The 0.400kg bead starts from rest at A. If the bead comes to rest at C, find the loss in mechanical energy as it goes from B to C. I can...
*November 6, 2011*

**Physics**

An Alaskan rescue plane traveling 36 m/s drops a package of emergency rations from a height of 137 m to a stranded party of explorers.Where does the package strike the ground relative to the point directly below where it was released
*November 3, 2011*

**MATH**

given the arithmetic sequence 71,65,59 ... if a(n) is -43 what is the value of n
*October 31, 2011*

**MATH**

a pile of bricks has 85 bricks in the bottom row, 79 bricks in the second row, 73 in the third row, and so on until there is only 1 brick in the top row. how many bricks are in the 12th row? how many rows are there in all?
*October 31, 2011*

**chemistry**

If 58g of NaOH are dissolved in water to make a final volume of exactly 400mL, what is the molar concentration of NaOH? (The FM of NaOH = 40.0) How do I set this up?
*October 31, 2011*

**algebra**

i need help with my math for college, im currently a little behind, ive had 2 tutors but the tutors that ive had dont really know what there doing, this is stressful and im hopig someone who knows what there doing can help me
*October 30, 2011*

**HELP**

subtract simplify by removing factor of 1 if possible 3bc/b^2-c^2-b-c/b+C
*October 28, 2011*

**Help**

Solve the equation q+7/4+q-3/3=5/2 I think there is no solution
*October 28, 2011*

**Help**

Divide and simplify x^2-16/x divide by x+4/x+1 I get (x-4)(x+1)/X is this correct
*October 28, 2011*

**Help**

simplify by removing factor of 1 7z-49/7z I have the answer as -7
*October 28, 2011*

**Help**

Find the LCM t^3+8t^2+16,t^2-8t
*October 28, 2011*

**help**

I will try my best
*October 28, 2011*

**help**

find all numbers for which the rational expression is undefinded 8/8z+7 I think the expression is undefined for all real numbers
*October 28, 2011*

**HELP**

simplify remove factors of 1 3v-9/3-v
*October 28, 2011*

**HELP**

multiply and simplify 3a^8/4t^2*16t^4/9a I have the answwer as 4a^7t^2/3t^2
*October 27, 2011*

**HELP**

multiply and simplify 3a^8/4t^2*16t^4/9a I have the answwer as 4a^7t^2/3t^2
*October 27, 2011*

**Help**

Find the LCM of 3(t-2)and 6(t-2) is it 18(t-2)
*October 27, 2011*

**Help**

Lisa can shovel her drive way in 35 minutes. Tom can shovel the same drive way in 40 minutes. How long will it take them to do the job together?
*October 27, 2011*

**MATH**

lim x-->0 x^2+3x/x^2-3x x not =0 1 x=0
*October 25, 2011*

**calculus**

A child is flying a kite. If the kite is 125 feet above the child's hand level and the wind is blowing it on a horizontal course at 7 feet per second, the child is letting out cord at _____ feet per second when 245 feet of cord are out. Assume that the cord remains ...
*October 25, 2011*

**Social Studies**

I have a midterm tomorrow and this is the essay question: “When men’s minds seem narrow to you, tell yourself that the land of God is broad; broad His hands and broad His heart. Never hesitate to go far away, beyond all seas, all frontiers, all countries, all beliefs...
*October 23, 2011*

**art history**

Discuss the ideological and visual differences between Renaissance Art and Baroque Art. (think in terms of, for example, religion, society, and scientific discoveries)
*October 16, 2011*

**chemistry**

WHat is a precipitate?
*October 16, 2011*

**MATHHH HELPPPP**

3b+7=-2 14+h/5=2 h/5=fraction m/8+4=16 m/8=fraction 3x-1=8 35=3+5x -3+m/3=12 m/3=fraction -x-4=-20 5=-z-3
*October 11, 2011*

**algebra**

3b+7=-2 14+h/5=2 h/5=fraction m/8+4=16 m/8=fraction 3x-1=8 35=3+5x -3+m/3=12 m/3=fraction -x-4=-20 5=-z-3
*October 11, 2011*

**PLEASE HELP ME SOLVE !!!!!!!!**

A mass of 11 kg is placed on a frictionless incline which is inclined at an angle of 69 degrees above the horizontal. It is held in place by a rope which is attached to a wall at the top of the incline. The rope is angled 13 degrees above the direction parallel to the incline...
*October 6, 2011*

**Physics **

a car traveling westward at 20 m/s turns around and travels eastward at 5 m/s. what is the change in velocity of the car?
*October 5, 2011*

**physics**

help
*October 4, 2011*

**MATH**

a box contains 20 slips of papers, numbered 1-20. A slip of paper is drawn from the box and the number is noted. Find the probability that it is a positive integer less than 21.
*October 3, 2011*

**math**

if a set of six books is placed randomly on a shelf, what is the probability that they will be arranged in either correct or reverse order?
*October 3, 2011*

**math**

In how many ways can the letters of the word EIGHT be arranged using only four of the letters at a time?
*October 3, 2011*

**math**

Solve for y, then find the value of y when given x = –2. 6x = 7 – 4y
*September 29, 2011*

**math**

Mr. and Mrs. Smith each bought 10 raffle tickets. Each of their three children bought four tickets. If 4280 tickets were sold in all, what is the probability that the grand prize winner is: a. Mr. or Mrs. Smith? b. one of the 5 Smiths? c. none of the Smiths?
*September 27, 2011*

**beowulf**

why was the importance of adding the passage about Queen Modthryth in Beowulf?
*September 27, 2011*

**math**

Doug has 170 stamps in his collection. His first book of stamps has 30 more stamps in it than his second book how many stamps are in each book. how do you figure out what P is? Divide 170 by 2?
*September 27, 2011*

**MATH**

find the coordinate of the center and identify the conic: 5y^2 - 2x^2 - 10y - 12x = 23
*September 26, 2011*

**english**

what is a good kenning for the ocean
*September 26, 2011*

**math**

it would be possible to have 3 quarters, 4 dimes, and 4 pennies in your pocket and not be able to make change for a dollar, so the answer would be $1.19.
*September 26, 2011*

**Math 116a**

solve by elimination 5r-6s=18 6r-5s=46 The solution is There are infinitely many solutions there is no solution
*September 26, 2011*

**math 116A**

functions f(-1)=5x^2-3x 5(1)^2-3(-1)=28 correct I hope
*September 26, 2011*

**math 116a**

use distributive property to solve the equation 4(w-3)=-12 W=0
*September 26, 2011*

**math 116**

Solve using the multiplication principle Dont forget to preform a check 11x=-99 Would the answer be -9?
*September 26, 2011*

**Math 116a**

solve using the addition and multiplacation principles 1+6x<49 would I subtract 1 and divide 48 by 6 to find X? x=8
*September 26, 2011*

**Math 116a**

Find the slope X=-4 if it exists. Don't I need the Y to find a slope?
*September 26, 2011*

**Math 116**

Yeh I think I got figured now thank you
*September 26, 2011*

**Math 116**

The length of a rectangle is fixed at 23cm What lengths will make the perimeter greater then 86cm? Then length must be greater then cm. would it be 20cm? l+l+23+23>86 2l+46>86 2l>40 l>20?
*September 26, 2011*

**Math 116a**

you're awsome
*September 26, 2011*

**Math 116a**

ok I get it the regular price is 82.61 ThankYou
*September 26, 2011*

**Math 116a**

would it be 79.30 66.09+20%
*September 26, 2011*

**Math 116a**

Amy bought a pair of running shoes she paid $66.09 during a 20% off sale, what is the regular price of the shoes? Would I take 66.09 divide by 20%?
*September 26, 2011*

**Math **

-5/6x=-7/8 what is x? would it be 1/4? I don't know how to do this?
*September 26, 2011*

**Math 116a**

oh yes -9+7=-2 duh thanks
*September 26, 2011*

**Math 116a**

Collect Like Terms 15p+7q-4p-9q I get the answe 11p+2q/ I hope I am doing theis correctly.
*September 26, 2011*

**Math 116A**

Cool thankyou I amn trying to figure this stuff out
*September 26, 2011*

**Math 116A**

Simplify 8[56-(-86-32)]= Would thid be 1392 is that what is ment by simplify?
*September 26, 2011*

**Math 116 a**

I got 48/15 divide 48 by 15 and I got 3.2 how does 302 turn into 16/5?
*September 26, 2011*

**Math 116 a**

How do you get that?
*September 26, 2011*

**Math 116 a**

ok thank you
*September 26, 2011*

**Math 116 a**

multiply -8/3*(-6/5)= would it be 48/15? I can remember how to multiply fractions help
*September 26, 2011*

**Math 116a**

Translate to an algebraic expression The product of 45% and some number the translation is? Would it be .45/x?
*September 26, 2011*

**Math 116a**

OH my gosh I remember now sorry now I remember.
*September 26, 2011*

**Math 116a**

What is that? PEMDAS?
*September 26, 2011*

**Math 116a**

Ok thank you I try to put an answer to to see if I am right is that ok?
*September 26, 2011*

**Math 116a**

Evaluate a+b/9= A=51 and B=3 Would I substitute a and B to be 54 so is the answer 6?
*September 26, 2011*

**pre calc**

A math teacher uses four algebra books, two geometry books, and three pre-calculus books for reference. In how many ways can the teacher arrange the books on the shelf if books coiver the same subject matter are kept together?
*September 25, 2011*

**Fractions**

I got it x>93/72?
*September 23, 2011*

**Math the end**

The answers are -5 and -3 I need to know hoe to write the solution {x x> } help
*September 23, 2011*

**Math the end**

Can domeone help me with this? solve 7x + 4 ¡Ý - 31 or 9x + 4 ¡Ý - 21 I need to know how to write the solution {x x> } This is my last day of this class
*September 23, 2011*

**math**

A Freight train passed through a town. Behind the engine was the coal car. The cattle car was between the milk car and the lumber car. The open boxcar was in front of the flat car but directly behind the milk car. Of course, a caboose was at the end. In what order were the ...
*September 23, 2011*

**Math **

Thank You
*September 23, 2011*

**Math 116a**

Solve and Graph 2x+9¡Ý5 and 2x-13¡Ý-9 The solution is {x|x¡Ý } Help
*September 23, 2011*

**Math 116a**

Solve 9/10(3+8x)+3¡Ý15 The solution is {x|x }
*September 23, 2011*

**Algebra 116 A**

solve and graph 2x+9 greater or equal to 5 and 2x-13 greater or equal to -9 the solution is {x x greater or equal to ?} What is the ? help
*September 23, 2011*

**Algebra 116 A**

I thought I needed Brackets or such
*September 23, 2011*

**Algebra 116 A**

I need to write an interval notion for 9<x<14 = how do I write this?
*September 23, 2011*