Friday

July 31, 2015

July 31, 2015

Total # Posts: 232

**Physics**

Assume that Earth’s magnetic field is every- where perpendicular to the path of a proton and that Earth’s magnetic field has an inten- sity of 4.10 × 10−8 T. What speed would a proton need to achieve in order to circle Earth 1170.0 km above the magnetic ...
*June 2, 2015*

**DrBob222-re: chem question**

Sorry, I did make an error when I posted the earlier question: It should have said: A solution has [OH-] = 2.0 x 10-^14 M. The [H+] in this solution is? I hope you can help. Thank you. Sorry about the earlier error.
*April 23, 2015*

**Chem - Acid & Bases**

Please help with the solution: Question asks: A solution has [OH-] = 2.0 X 10 negative ^14. The [H-] in this solution is 2.0 x 10 negative ^14. Thank you for your help. Appreciated.
*April 23, 2015*

**Chem - Molarity**

Hi, I have this question related to Molarity and hoping you can help? The question says: 50.0 gram sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl? It says also "Choose ...
*April 22, 2015*

**Trig**

Please help with this question: A plane travels a distance of 140 km due west of Vancouver International Airport. It then travels 60 km at a bearing of 340 degrees. How far from the Airport is the plane? Thank you for all your help.
*April 20, 2015*

**Trig**

Can you please help with this trig question: The angle of elevation to the top of a nearby mountain is 46 degrees. After walking 1 km toward the mountain, you determine the angle of elevation to be 68 degrees. How high is the mountain? Thank you for all your help.
*April 20, 2015*

**Math**

Steve, thanks for responding, the question may have said rectangle. It was on a previous test and with a final coming up; I wanted to make sure I knew how to do. But I do have another one: The question: The perimeter of a rectangle is 34 inches and the area is 50 square inches...
*April 20, 2015*

**Math**

Please help with trying to solve the following; in particular how to get the correct equation set up. The perimeter of a square is 64 cm and the area of the square is 192 cm. What is the length of width of the rectangle? Thank you for your help.
*April 20, 2015*

**Math**

Can you please help with this geometry question. An open box is formed from a square piece of material by cutting 2-in squares from each corner of the material and folding up the sides. If the volume of the box that is formed is to be 72 in cubed, what was the original piece ...
*April 19, 2015*

**Math**

Can you please help with correct format for the following?: re: d = rt equation A boat traveled 40 miles down a river in 2 1/2 hours. The return trip going upstream took twice as long. What is the rate of the boat in still water? Appreciate any help on the set up. Thank you,
*April 19, 2015*

**Math**

Whoever can help with a question I posted earlier. I am very sorry; I put the wrong variable in the question. Question is to solve for y and not "x" as my previous message and the equation is: x = 3(r + ty) So sorry for the confusion. Please help at your earliest. ...
*April 18, 2015*

**Math**

Sorry, I should have corrected that it is to solve to 'y'. So, the question is: x = 3(r + ty) Solve for y. Can you help please. Cassandra
*April 18, 2015*

**Math**

Question asks to solve for x with equation: x = 3(r + ty) Please help with how to solve? Thank you.
*April 18, 2015*

**Math**

No worries. I will review your answer today and let you know if I need further help. Thank you Mr. Amg.
*April 18, 2015*

**Math**

Can you help please on the following question: "The sum of the lengths of the legs of a right triangle is 8 feet. If the length of the hypotenuse is 6 feet, find the length of the shorter leg to the nearest tenth of a foot." Thank you, Cassandra
*April 18, 2015*

**Math**

Can you help with this equation? Have to solve for the indicated variable: For x: With equation y = x + 1/x - 1; in case it doesn't make sense; the x + 1 is in the numerator and the x - 1 is in the denominator. Thank you for your help. Cassandra
*April 18, 2015*

**Chemistry**

Thanks for replying. Sorry, the 10.1 is the (e) choice. I had tried various ways after I posted my question and I may have found the answer. I used the Dilution equation and found an answer of .152 L which would then convert to (a) of 152 mL. Still not sure if it is correct ...
*April 3, 2015*

**Chemistry**

Hi, can you help with how to solve this equation? 50.0 gram sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl? The choices provided: a) 152 mL b) 255 mL c) 87.6 mL d) 412 mL 10....
*April 3, 2015*

**Chemistry **

A 0.3423 g sample of pentane, C5H12, was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.000 kg of water contained therein rose from 20.22°C to 22.82°C. The heat capacity of the calorimeter is 2.21 kJ/°C. The heat capacity of water = 4....
*March 31, 2015*

**chemistry**

my professor told us to change them the temperture from C to K but I will be sure to remember that. but the problem is: A 0.3423 g sample of pentane, C5H12, was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.000 kg of water contained therein rose ...
*March 30, 2015*

**chemistry **

I'm confused on number 6 on the take home test. in this problem are we going to use the heat capacity of calorimeter is 2.21kJ/c. I'm confused on how to set this problem up 1)I converted 1.000kg in to grams= 1000g 2) I used q=m*c* the change in T 1000g*(4.184J/g* C)*(...
*March 30, 2015*

**Chemistry **

heat of combustion of propane c3h8, 2220KJ/mol. the specific heat of copper is 0.385 J/g*C. How many grams of propane must be burned to raise the temperature of a 10.0kg block of copper from 25.0 C to 65.0 C,assuming none of the heat is lost to the surroundings I'm stuck ...
*March 30, 2015*

**Chemistry**

Hi, can you help me with this question: "you have 25.00 mL of a 0.1000 M sugar solution. How much water must be added to make a 0.025 M solution? Thank you.
*March 29, 2015*

**Physics**

Please help me with this question How much work is done by a boy of mass 70kg who ran up a flight of 31steps each15m high. Take g=10m/s^2
*March 4, 2015*

**math**

A computer store charges a $40 service fee plus $35 for each hour it takes to repair a computer. Write an expression that gives the total cost of a repair that takes h hours. 40+35h A fitness club charges a $100 activation fee and $33 for each month. Write an expression for ...
*February 24, 2015*

**Math**

The line that passes through (4,3r) and (2+r,-6) is perpendicular to the line with equation 5x+3y+12=0. find r.
*February 21, 2015*

**language ela a**

Based on the context clues in the sentence, what is the best meaning of “affinity”?
*February 2, 2015*

**biology **

phase in photosynthesis during which the energy in sunlight is trapped and converted into ATP and NADPH I need the term for this and cannot find it anywhere. Thanks!
*December 2, 2014*

**biology **

the manufacturer of carbohydrates, fats, and proteins. whats the word to this definition?
*November 20, 2014*

**biology**

thank you, i have this worksheet that doesnt go with our books and im stumped on a bunch of questions.
*November 20, 2014*

**biology **

the release of waste into the enviroment. i need the word to this definition.
*November 20, 2014*

**biology **

the breakdown of food by enzymes. What is the word that goes with this definition?
*November 20, 2014*

**Math**

Write an equation of a line that passes through the point (8,2) that is (a) parallel and (b) perpendicular to the graph of the equation y= 4x +3
*November 1, 2014*

**math geometry**

Given a circle with an 8" radius, find the area of the smaller segment whose chord is 8" long? I don't even understand how to start a question like this?
*October 6, 2014*

**Bio Chem**

Carbonate is commonly used to buffer household detergent solutions to a pH of 9.0. How many grams on NaHCO3 and how many grans of NA2CO3 are needed to prepare 0.75L of a 100mM solution? The 2nd pKa of carbonic acid is 10.33.
*September 4, 2014*

**Math**

(-10)exponent is 2
*May 17, 2014*

**ap statistics**

Which of the following is not correct? A. The rejection region is controlled by the alpha level and the alternate hypothesis. B. The p-value measures the probability that the null hypothesis is true. C. The probability of a Type I error is controlled by the selection of the ...
*April 24, 2014*

**information literacy**

. In the keyword search on EDSeek's Home Page, enter the following statement: NASA* AND Mars*. Based on the results from this search, choose the best answer to this question. Which of the following is not a listed document type?
*April 12, 2014*

**College math**

A and B agree to share the cost of an $18 pizza based on how much each would eat. B ate 3/2 of the pizza that A ate. How much should A and B each pay? A= B= Thank you
*March 20, 2014*

**College Math**

This is my last question, I promise! Use U={1,2,3,4,5,6,7,8,9,10} A={2,3,5} B={5,6,7,9} C={1,4,10} to find the set AUB You guys are awesome!!
*March 18, 2014*

**College math**

Thanks Steve
*March 17, 2014*

**College math**

Help me The product of 4 and y is the sum of 3 and 9
*March 17, 2014*

**College math**

You should have typed "College math??
*March 17, 2014*

**College math**

the lengths of the legs of a right triangle are given: a=10 b=24 c=____? Thank you so much
*March 17, 2014*

**College math**

You are great Damon!!
*March 17, 2014*

**College math**

Which statement describes the quadratic equation 6x^2-4x+1=0,correctly? A. it is one completed real root? B. It is two complete complex roots? C. It is two unequal real roots? Please help me with this
*March 17, 2014*

**College Algebra**

Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?
*March 17, 2014*

**College math**

Find the area and the circumference of a circle of radius 4 meters. Thank you
*March 13, 2014*

**College math**

Thank you Damon. I could not have done this without your help!!
*March 13, 2014*

**College math**

The length of the sides of a triangle are given as 8, 15, 17. The hypotenuse is the side that is the length of ____?
*March 13, 2014*

**PHYSICS**

a) What is the maximum current in a 4.00 µF capacitor when it is connected across a North American electrical outlet having ΔVrms = 120 V, f = 60.0 Hz? mA (b) What is the maximum current when it is connected across a European electrical outlet having ΔVrms = ...
*November 29, 2013*

**physics**

A 19 turn circular coil of wire has diameter 1.09 m. It is placed with its axis along the direction of the Earth's magnetic field of 51.0 µT, and then in 0.195 s it is flipped 180°. An average emf of what magnitude is generated in the coil?
*November 13, 2013*

**physics**

A flat loop of wire consisting of a single turn of cross-sectional area 8.10 cm2 is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 1.90 T in 0.95 s. What is the resulting induced current if the loop has a resistance of 2.80 ?
*November 13, 2013*

**algebra**

Rita's tuition bill for last semester was $4360 If she paid $6052 in tuition this semester what was the percentage increase on her tuition Please help me as I am not sure of my answer which is 0.38%
*October 24, 2013*

**Chemistry**

How many moles of H2O are in 3.00L of water? (d=1.00g/mL)
*September 23, 2013*

**History**

Political factionalism in the U.S. during the 19th century was fueled by the emergence of a unique American culture and the transition from an agrarian to market economy. Please give me some information on writing about this.
*June 21, 2013*

**social studies**

Political factionalism in the U.S. during the 19th century was fueled by the emergence of a unique American culture and the transition from an agrarian to market economy. How do I start writing about this subject?
*June 10, 2013*

**Science**

0.04 m/s
*May 27, 2013*

**Algebra 1**

can you please explain to me how you got the answer because i have no idea how to do this..
*May 6, 2013*

**Algebra 1**

Factoring Polynomials: 2x to the second power -3x-2 could you please explain to me how to do this.
*May 6, 2013*

**Algebra **

Ground beef sells for $4.75 per kg and ground pork sells for $5.50 per kg. How many kg of ground pork should be mixed with 8 kg of ground beef to make a mixture that sells for $5.10 per kg? I dont know how to set this up or anything. Please help!
*December 12, 2012*

**Algebra**

The second one: 2+3+5+7+11+13+17+19+23+29+31+37+41+43+47+53+59+61+67+71+73=712 Matt The fourth one: 2-9=8 digits 10-99=178 digits 100-200=300 digits 201-300=297 digits 301=3 digits 302=3 digits 303=3 digits 304= 3 digits 8+178+300+297+12= 795 304 pages
*December 5, 2012*

**physics**

convert an acceleration of 4.1 mi/h/s to m/s^2
*October 17, 2012*

**physics**

a 21.2 kg mass attached to a spring scale rests on a smooth, horizontal surface. the spring scale, attached to the front end of a boxcar, reads T=35.6N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, ...
*October 17, 2012*

**physics**

If a seagull flies to a height of 22.5 meters, how long will the clam take to fall? The acceleration of gravity is 9.8m/s. answer in units of sec
*October 17, 2012*

**math**

(exponents and roots) Michael wants to fence in a new garden so that the garden has an area of 625 square feet. If his garden is in the shape of a square, what is the length of each side?
*September 18, 2012*

**Social Studies**

To survive in different areas, native people had to learn to?
*September 6, 2012*

**Health**

C. Environment and genetic factors
*August 30, 2012*

**algebra1**

A rule of thumb states that the ideal weight (in ounces) of a baseball bat for a high school player is 5 ounces more than one third of the player's height (in inches). Write an expression that describes the ideal weight in ounces of a bat for a high school player who is h ...
*August 15, 2012*

**Math**

The Pew Research Center recently polled n= 1048 U.S drivers andfound that 69% enjoyed driving their automobiles. (a) Construct a 95% confidence interval for the proportion of U.S.drivers who enjoy driving their automobiles. (b) In 1991, Gallup Poll reported this percent to be ...
*May 1, 2012*

**physics**

State how the centripetal force is provided in the case of a satelite orbiting the earth
*April 8, 2012*

**Chemsitry**

Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base...
*April 2, 2012*

**Chemsitry**

A chemist needs to make 50 mL buffer solution with a pH value of 7.25 using the acid/conjugate base pair of KH2PO4 and Na2HPO4 (which has an effective pKa = 6.86). The buffer solution needs to be made so that the total concentration of buffer is 0.10 M (that is, [acid] + [base...
*April 2, 2012*

**Chemsitry**

Tris is an abbreviation for tris (hydroxymethyl) aminomethane, which is a weak base. Calculate how many grams of tris (mw=121.14g/mol) are needed to make 25mL of 0.10M tris solution. Calculate how many mL of 0.25M HCl are needed to convert half of the moles of tris present in ...
*April 2, 2012*

**pre-algebra**

oh you dont have to worry about it.
*March 15, 2012*

**pre-algebra**

thomas borrowed $4800 to buy a new car. he will be paying $96 each month for the next 60 months. find the simple interest rate for his car loan.
*March 15, 2012*

**Pre-algebra**

thank you!
*March 15, 2012*

**Pre-algebra**

i got 216 would that be right?
*March 15, 2012*

**Pre-algebra**

$1200 at 6% for 36 months
*March 15, 2012*

**Chemistry**

A student has 100.0 mL of an unknown solution of Vitamin C. She removes 1.00 mL of this solution, dilutes it to 50.0 mL, and titrates this second solution with an iodine solution solution that 8.5x1^-4 M. 6.60 mL of iodine solution is required to reach the endpoint. 1. How ...
*March 12, 2012*

**Chemistry**

in step 2 aren't you supposed to divide by the molar mass of vitamin C (176.12)?
*March 12, 2012*

**Chemistry**

would 5.61x10^-5 make sense for the molarity for the original unknown sample of vit C solution prior to dilution?
*March 12, 2012*

**Chemistry**

Nevermind. i figure it out. Thank you so much for your help!
*March 12, 2012*

**Chemistry**

to find the molarity of the original vit C do you just divide the moles found in 1 divided by 0.001 L or 1.0 mL?
*March 12, 2012*

**Chemistry**

to find the total moles of iodine, do you just multiple 8.5x10^-4 by .00660 L?
*March 12, 2012*

**Chemistry**

we are not given the molar mass of the vit. C. how are we supposed to find the milligrams of vit C are in the orginal sample?
*March 12, 2012*

**Chemistry**

A student has 100.0 mL of an unknown solution of Vitamin C. She removes 1.00 mL of this solution, dilutes it to 50.0 mL, and titrates this second solution with an iodine solution solution that 8.5x1^-4 M. 6.60 mL of iodine solution is required to reach the endpoint. 1. How ...
*March 12, 2012*

**physics**

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.60 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 2.34 m from ...
*February 28, 2012*

**Chemistry**

Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL. Chemical reaction: Blue dye + ClO^- -->...
*February 28, 2012*

**Chemistry**

Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Chemical reaction: Blue dye + ClO^- -->oxidized dye +Cl^- Reaction #1: 5.0 mL or diluted bleach solution, 15.0mL of distilled water, 10.0 mL of diluted blue dye Reaction #2: 10.0mL of diluted...
*February 27, 2012*

**Chemistry**

Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL.
*February 27, 2012*

**Chemistry**

Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL.
*February 27, 2012*

**physics**

An object is thrown upwards and after 2 seconds is 78 m above where it was initially thrown. Assume no air resistance, and determine the initial speed the object was thrown at.
*February 21, 2012*

**math **

7k-8k=1 how would you do this?
*December 13, 2011*

**math **

thank you
*November 30, 2011*

**math **

3(x+ -5)+7(x+2)
*November 30, 2011*

**math **

after i looked at it a couple times i figured it out how you did it thank you(:
*November 30, 2011*

**math **

can you please explain this..
*November 30, 2011*

**math **

4+9c+3(c+2)
*November 30, 2011*

**media**

Huge corporations own every television network and most other media outlets. How does this affect their news coverage? How much influence do you think these corporations have on the public? Do you think the public is aware of the comments made by you and your classmates? (...
*November 16, 2011*