Sunday

February 7, 2016
Total # Posts: 3,004

**Chemistry**

perform the operation & leave answer correct amount of significant numbers. A) 3.76+4.318+ 0.005 B) 29.0- 52.0+ 37. please help dont know how to do !
*January 2, 2011*

**Physics-Gravitation**

What is the gravitational potential energy of a two-particle system with masses 5.4 kg and 5.0 kg, if they are separated by 1.3 m? If you triple the separation between the particles, how much work is done (b) by the gravitational force between the particles and (c) by you? ...
*January 2, 2011*

**math**

jen i need your help again how about 18;40
*December 31, 2010*

**math**

find what fractional part the first number is of the second 15;30 18;40 12;28 50;60 thank,jessica
*December 31, 2010*

**velocity**

crystal can ride her bike 10 km in 2.1 hours, what is her average velocity?
*December 20, 2010*

**physic HELP**

On a banked race track, the smallest circular path on which cars can move has a radius r1 = 106 m, while the largest has a radius r2 = 153 m, as the drawing illustrates. The height of the outer wall is 18 m. Find the smallest speed at which cars can move on this track without ...
*December 20, 2010*

**physics**

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
*December 19, 2010*

**physics**

A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 1.30 104 s. What is the speed at which the satellite travels?
*December 19, 2010*

**physics**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.80 104 m/s, and the radius of the orbit is 5.45 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.60 106 ...
*December 19, 2010*

**physics **

A jet (m = 4.00 105 kg), flying at 139 m/s, banks to make a horizontal circular turn. The radius of the turn is 3810 m. Calculate the necessary lifting force.
*December 19, 2010*

**physics**

Calculate the force of gravity on a spacecraft 19200 km (3 earth radii) above the Earth's surface if its mass is 1000 kg. what equation would i use
*December 19, 2010*

**physics**

A laboratory (astronomical) telescope is used to view a scale that is 306 cm from the objective, which has a focal length of 20.0 cm; the eyepiece has a focal length of 2.40 cm. Calculate the angular magnification when the telescope is adjusted for minimum eyestrain. (Note: ...
*December 17, 2010*

**physics**

A vertical spring with constant 830 N/m has a ball of mass 3 kg attached to the bottom of it, which is held with the spring unstretched. (a) How far must the ball be lowered to reach its equilibrium position? (b) The ball is given a charge of 0.060 C. If an electric field ...
*December 16, 2010*

**MATH please help!**

log 1/x + 3log2=log32
*December 16, 2010*

**chemistry**

A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction.
*December 15, 2010*

**chemistry**

A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction.
*December 15, 2010*

**math**

6 2/5
*December 14, 2010*

**math**

3 7/10 + 2 9/10
*December 14, 2010*

**math**

3 1/3 + 1 2/3
*December 14, 2010*

**math**

each morning Natalie jog 3 1/3 miles to the park. Then she takes a shortcut and jogs 1 2/3 miles back home. How many miles does Natalie jog each morning?
*December 14, 2010*

**5th grade**

7 5/12 - 5 7/12
*December 14, 2010*

**Calculus AB **

Analyze the function ln x=cx^2 to find the unique value of c such that there is exactly one solution to the equation. To do this find the value of c such that both sides of the equation have equivalent slopes at some point; this will give you a proper x-coordinate to work with.
*December 13, 2010*

**APMEH**

Thanks
*December 13, 2010*

**APMEH**

What does the book mean when they say..."the nobles pushed to reserve appointments to the officer corps of the armies, the bureaucracies,the government ministries, and the church exclusively for nobles"? This is during the 18th century
*December 13, 2010*

**ALGEBRA/please help**

I see my mistake. I was supposed to multiply 31 into 4. Thank you so much!
*December 13, 2010*

**ALGEBRA/please help**

I must simplify this expression. Am I correct? -4[-25-(9-3)]. I first subtract within the parentheses first -4[-25-(-6)] -4-(-31) = 27
*December 13, 2010*

**French**

En quoi se distingue l’anthropologie comme métier de l’anthropologie pratiquée comme une science ? What does this mean?
*December 13, 2010*

**precalculus**

how you do you use the power-reducing formula to find the exact value of the trig function: sin^2(37pi/12)
*December 12, 2010*

**ALGEBRA/AM I CORRECT?**

thank you so much!
*December 11, 2010*

**ALGEBRA/AM I CORRECT?**

OK, I will try this. Please let me know. 39x= -234; Divide by 39 on each side. x = 6. y=40+6(-6); 40+-36 = 4; (6,4)?
*December 11, 2010*

**ALGEBRA/AM I CORRECT?**

THANK YOU! Solve by substitution 3x+6y=6; -6x+y=40 My WORK: Y=40+6X; 3X+6(40+6X)=6; 3X+240+36X=6; x=-5.51; y=40+6(-5.51); y=40+-33.06; y=6.94 (-5.51,6.94) Is this right???
*December 11, 2010*

**mATH**

what is the decimal notation for 4/9
*December 10, 2010*

**mATH**

solve using multiplication principle. -2/7x=6/35
*December 10, 2010*

**mATH**

is it 42
*December 10, 2010*

**mATH**

A bucket has 28 liters of water in it is 2/3 full. How much can it hold?
*December 10, 2010*

**MATH**

5/6+1/5T=4/6
*December 10, 2010*

**mATH**

what are the LCM of 8 and 20
*December 10, 2010*

**Business Math**

$2.18 isnt a choice. Choices are: A) $1.66 B) $1.98 C) $2.23 D) $2.32
*December 10, 2010*

**Business Math**

what do u multiply 1.817*1.2?
*December 10, 2010*

**Business Math**

Every week, a grocery store buys 30 gallons of milk at a cost of $1.58 per gallon. The store owner anticipates a 15% spilage rate. To achieve a 20% markup based on cost, what should be the selling price per gallon? Round to nearest cent.
*December 10, 2010*

**Business Math**

Laurie expects to make $100,000 in 2007. Her social security tax rate is 6.20% up to the wage base, Medicare is 1.45%. How much FICA is Laurie expected to pay for the year?
*December 10, 2010*

**MATHS**

-12.27-0.9b=5.6(b+2.8) -12.27 - 0.9b = 4.6b + 15.68 15.68 - 12.27 = 4.6b + 0.9b 3.41 = 5.5b 3.41/5.5 = b ? = b
*December 9, 2010*

**math**

WHAT WAS THE ANSWER
*December 9, 2010*

**math**

what am i supposed to be doing?
*December 9, 2010*

**math**

solve the equation for b. -12.27-0.9b=5.6(b+2.8)
*December 9, 2010*

**Physics**

The length of a simple pendulum is 0.58 m, the pendulum bob has a mass of 285 g, and it is released at an angle of 16 degrees to the vertical. With what frequency does it oscillate?
*December 9, 2010*

**Keyboarding and word processing**

You should use your ring finger
*December 8, 2010*

**Chem**

Please tell me if these are right! What are the [H3O+] and [OH-] for a solution with the following pH values? a. 10.0 I got 1.0*10^-10 for [H3O+] and 1.0*10^-4 for [OH-] b. 5.0 I got 1.0*10^-5 for [H3O+] and 1.0*10^-9 for [OH-] c. 7.00 I got 1.0*10^-7 for [H3O+] and1.0*10^-7 ...
*December 8, 2010*

**Please Help CHEM**

Can you please tell me if these are right? Determine the pH for the following solutions A [OH-] = 1.0 X 10^-7 M I got 7 B. [H3O+ = 4.2 X 10 ^-3M I got 2.4 C. [H3O+]= 0.0001M I got 4 D. [OH-] = 8.5 X10^-9M I got 5.9 What are the [H3O+] and [OH-] for a solution with the ...
*December 7, 2010*

**math**

5x/5=-3x/8+1
*December 7, 2010*

**math**

Solve. 2-8x=22
*December 7, 2010*

**Help Chemistry**

Help
*December 7, 2010*

**Help Chemistry**

Can you please tell me if these are right? Determine the pH for the following solutions A [OH-] = 1.0 X 10^-7 M I got 7 B. [H3O+ = 4.2 X 10 ^-3M I got 2.4 C. [H3O+]= 0.0001M I got 4 D. [OH-] = 8.5 X10^-9M I got 5.9 What are the [H3O+] and [OH-] for a solution with the ...
*December 7, 2010*

**ALGEBRA/ CONFIRMATION**

I am told to graph and write in interval notation for 6 < x < 13. This is my answer (6,13) I would then graph with open ends to show that the endpoints are not included?? Please tell me if I am correct.
*December 7, 2010*

**MATH**

Max’s credit card charges him 1.575% interest per month on his average daily balance in that month. Max’s average daily balance for January is $810. What is the interest that he will pay for January
*December 7, 2010*

**MATH**

Max’s credit card charges him 1.575% interest per month on his average daily balance in that month. Max’s average daily balance for January is $810. What is the interest that he will pay for January
*December 6, 2010*

**college physics**

Rather than rotate completely horizontally, a carousel rotates at an angle of 10° from horizontal, with a constant angular velocity of 1.571 RAD/s. A box is placed 1.5 m from the axis of rotation. What’s the minimum coefficient of static friction so the box will not ...
*December 6, 2010*

**Chem**

Please tell me if these are right! 1.How many milliliters of 0.215 M NaOH solution are needed to completely neutralize 2.50 ml of 0.825 M H2SO4 solution? I got 19.2 ml 2. A 10.0-ml sample of vinegar which is an aqueous solution of acetic acid HC2G3O2 requires 16.5 ml of 0.500M...
*December 6, 2010*

**MATH**

A dog-food company makes a special kind of dog food. It consists of 30% meat powder and 70% grain. The meat powder costs 90 cents per pound. The grain costs 60 cents per pound. What is the cost of the raw materials per pound of dog food
*December 6, 2010*

**college physics**

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000kg/m^3 and the wood has a density of 500kg/m^3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?
*December 6, 2010*

**college physics**

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000kg/m^3 and the wood has a density of 500kg/m^3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?
*December 6, 2010*

**MATH**

SO HE STARTED OUT WITH 12?
*December 6, 2010*

**MATH**

Allen started out with x marbles. He doubled his number of marbles by buying an additional x marbles from Betty. Then he gave away one-third of all his marbles to his friend Clarence. At the end of the day, he had 16 marbles. How many marbles did he start out with
*December 6, 2010*

**Business**

How to develop documentation for Small Business professionals to manage a specific employment position that would assist professionals to choose, train, an develop successful employees toward helping the company meet its goals?
*December 5, 2010*

**physics**

what equation would i use if i wanted to find the magnitude for this problem A box of mass 32.0 kg is subject to an applied force (FA) with an elevation angle of 39.9°, and it accelerates to the right at 6.31 m/s2. The horizontal surface has a coefficient of friction μ...
*December 5, 2010*

**English**

In Life of Pi, which is the true story? To me, I think the answer can go either way... Can someone help me? :S
*December 4, 2010*

**11th grade**

No two anions may be put together in an ionic compound. Cl and Br are both negatively charged. You could put BACl2 for example.
*December 3, 2010*

**PLEASE HELP/ALGEBRA**

thank you so much
*December 2, 2010*

**PLEASE HELP/ALGEBRA**

Solve by the elimination process: 0.3x - 0.2y = 4; 0.2x + 0.3y = 5/23
*December 2, 2010*

**Math Help please!!**

37. Darren worked 28 hours at $3.15 per hour. He made the following tips: $18, $16, $20, $30, and $18. What is his average hourly wage? $58 $20.40 $6.79
*December 2, 2010*

**Algebra**

Solve by the elimination process: 0.3x - 0.2y = 4; 0.2x + 0.3y = 5/23
*December 2, 2010*

**Pre- cal Trig **

2cos^2x=cosx. Can you subtract the cos from cos^2? Or what would i have to do?
*December 2, 2010*

**Geography**

Choose the geographic theme represented below. Paraguay is a landlocked nation. It is bordered by Bolivia, Brazil, and Argentina. location human-environmental interaction movement regions
*December 2, 2010*

**algebra**

A car generally depreciates 25% of its original value in the first year. A car is worth $27000 after the first year. What was its original cost?
*December 1, 2010*

**physics**

In a church choir loft, two parallel walls are 5.70 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.900 m away from it. So that she can see the choir, a flat mirror 0.600 m wide is mounted on the south wall, straight in front of ...
*November 30, 2010*

**Chemistry**

which is an example of physical change 1.water decomposing into hydrogen and oxygen 2.potassium and bromine combining to form potassium bromide 3.solid ice melting into liquid water 4.none of the above i think its 3.
*November 28, 2010*

**philosophy**

"Happiness belongs to the self-sufficient." - Aristotle What does it mean? I don't get it...
*November 28, 2010*

**physics **

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?
*November 27, 2010*

**physics **

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?
*November 27, 2010*

**physics**

So how do you get the first part? "{
*November 26, 2010*

**medicine**

How would you make a 1000ml soln of 5% dextrose in LRS from 100ml of 50% dextrose and 1000ml of LRS
*November 26, 2010*

**Math**

The table below gives the educational attainment of the U.S. population 25 years and older since 1960. Males- Percentage with 4 years of highschool 1960 39.5% 1970 51.9% 1980 67.3% 1990 77.7% 2000 84.2% 2004 84.8% Percentage with 4 years of college or more 1960 9.7% 1970 13.5...
*November 25, 2010*

**MATH**

Perform the operation for each equation, if there is a solution [4k -8y ] [5k+6y 2k+1] [6z - 3x] - [2z+5x z+4] [2k + 5a] [4k+6a 3a+2]
*November 25, 2010*

**Biology**

Thank you
*November 24, 2010*

**Biology**

What are the benefits of antibiotic for human being?
*November 24, 2010*

**chemistry**

where is 1.155X10^-9 from?
*November 23, 2010*

**chemistry**

The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25°C. Calculate the pH of a 0.0385-M hypochlorous acid solution? i got help with this problem, but i dont get where one of the numbers came from (3.4 x 10^-5)??? i tried makeing 3.0 x 10^-8 the x but i still dont ...
*November 23, 2010*

**chemistry**

The acid-dissociation constant, Ka, for gallic acid is 4.57 × 10-3. What is the base-dissociation constant, Kb, for gallate ion?
*November 23, 2010*

**chemistry**

The pH of a 0.55-M aqueous solution of hypobromous acid, HBrO, at 25°C is 4.48. What is the value of Ka for HBrO? how do you solve for Ka?
*November 23, 2010*

**english 10th**

what is a metaphor and hyperbole for the book the Bar Code Rebllion
*November 21, 2010*

**algebra**

how do you solve (f+g)(3) let f(x) = x2-2x and g(x)= x-5
*November 21, 2010*

**US History**

Evaluate the administrations of Presidents Hayes, Garfield, Arthur, Cleveland, and Harrison in reference to their conceptions of the office and the use of executive power.
*November 20, 2010*

**chemistry**

A 47.7-g sample of SrCl2 is dissolved in 112.5 mL of solution. Calculate the molarity of this solution.
*November 20, 2010*

**physics**

What is the energy in joules of an x-ray photon with wavelength 8.40*10e-10 m? ____J? (b) Convert the energy to electron volts. ___eV ?
*November 19, 2010*

**Rodriguez**

How many grams of CO2 will be produced when 29.0g of C3 H8 reacts with extra O2?
*November 19, 2010*

**Calculus**

a farmer has 160 ft of fence and wants a pen to adjoin to the whole side of the 130 ft barn. what should the dimensions be for maximum area?
*November 18, 2010*

**Physics**

A 70 kg man just before contact with the ground has a speed of 5 m/s In a stiff-legged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the gravity force, find the...
*November 18, 2010*