Thursday
February 11, 2016

Posts by andy

Total # Posts: 877

11th grade math
The equation Ax^2 + 4y^2 = 16 represents an ellipse. Find all values of A such that its intersection with y = |x| has coordinates (x,y) which are integers.
December 19, 2010

Math
The equation Ax^2 + 4y^2 = 16 represents an ellipse. Find all values of A such that its intersection with y = |x| has coordinates (x,y) which are integers.
December 16, 2010

physicis
How much power does it takes to do 104 J of work in 8 seconds
December 13, 2010

physicis
How far will 350 J raise a 7kg mass?
December 13, 2010

English
Can anyone see any rhetorical device in this sentence? His father’s voice: You gonna let ’em push you around like that, boy? “No sir, Daddy,” Perry whispered. “I sure as hell ain’t.”( Sigler 227)
December 8, 2010

math
Sum of a 3 digit # is 24. Ones digit is 2 more than 2xs the hundred dig. Tens dig is 1 more thn 3xs the hund dig. Wats the #??
December 7, 2010

chemistry
2 Na202 + 2H20 -> 4NaOH + 02 When 200.g of Na202 were reacted, 32.0 g of 02 were collected. The yield of 02 collected was (how many percentages)
December 7, 2010

English 12 U
Please ignore my previous post, I accidentally posted my rough draft Okay for English 12 U, I'm doing a literary essay for Life of Pi, by Yann Martel. The topic of my essay is Martel (author's) depiction of setting in Canada and India. (Role of setting) I'd like ...
December 1, 2010

Math
Many thanks
November 28, 2010

Math
The path of a cliff diver as he dives into a lake is given by the equation y= -(x-10)^2+75, where y meters is the divers height above the water and x meters is the horizontal distance travelled by the diver. What is the maximum hight the diver is above water? Is the answer to ...
November 28, 2010

Math
The path of a cliff diver as he dives into a lake is given by the equation y= -(x-10)^2+75, where y meters is the divers height above the water and x meters is the horizontal distance travelled by the diver. What is the maximum hight the diver is above water? How can I find ...
November 28, 2010

English 12
Yesterday, i posted a question about writing a thesis for Life of Pi. However i'm not sure how to develop a thesis from my topic. The topic of my essay is "Yann Martel's depiction on the role of setting in India and Canada". If anyone can kindly help me to ...
November 21, 2010

English 12
alright thank you, ill post a question later on when i develop a thesis
November 20, 2010

English 12
Okay, for English 12 im doing a semiar on Yann Martel's book, "Life of Pi" The topic of my essay is "martel depiction of Canada and India= the role of setting" My main body paragraphs are Setting in Canada Setting in India Setting in the Ocean what im ...
November 20, 2010

physics
you're not following the sig fig rule- it's -110 because you can only have 2 significant figures.
November 18, 2010

Finance
I need help writing scenario style questions for a school business management class
November 7, 2010

Bio Lab
You need to prepare medium for your culture cells. Your salt solution is 10x concentration, dilute to 1x for use. You also need to add fetal bovine serum for a final concentration of 10%. What would you add of each for the correct final concentrations in a liter of media?
November 3, 2010

Organic Chemistry
What would have happened if we had forgotten to neutralize the aqueous solution before recrystallization?
November 3, 2010

Physics
Sam is taking his girlfriend Sally out for a ride in his boat. He starts out at rest. He accelerates with an acceleration of 0.263 m/s^2 for 92.1 s. At that time Sally decides they are going fast enough and the boat moves at constant speed for a distance of 286 m. Then Sally ...
October 28, 2010

science
Do plants grow better with tap water or distilled water?
October 23, 2010

chem--need help, please!!!
thank you very much, DrBob222!
October 20, 2010

chem--need help, please!!!
Ka for benzoic acid, C6H5COOH, 6.5x10^-5. Calculate the pH of solution after addition of 10.0, 20.0, 30.0, and 40.0 mL of 0.10 M NaOH to 40.0 mL of 0.10 M Benzoic acid. PLEASE CHECK MY ANSWER!!!!! My answer is: Moles acid = 0.040 L x 0.10 M = 0.0040 Moles base = 0.010 L x 0.10...
October 20, 2010

social studies
What is the base for the earth's hills and mountains?
October 17, 2010

physics
does each of the two lenses used in a microscope produce a magnification of the object being viewed?
October 17, 2010

AP Human Geography
idiocy
October 15, 2010

Biology
Are there any viruses/diseases in the tundra?
October 15, 2010

math
marcias house is approx. 10 miles east of the airport. a jet is flying directly over her house after taking off from the airport and flying approx. 12 miles. approx how many miles high is the jet when it flys over marcias house?
October 11, 2010

math
when a marble hits a wall at a 22 degree angle, what is the measure of the angle between the two paths of the marble?
October 11, 2010

History
What difficulties did the Pilgrims encounter in their attempt to gain passage to the New World?
October 8, 2010

chem
what are the net ionic equations for ClO3^-; Zn^2+ undergo hydrolysis?
October 2, 2010

math
the equation is f(x) = (1/sq. root of 1-x^2) 1. f(x) is never zero. 2. 0 is in the domain of f 3. All negative real numbers are in the domain of f 4. All positive real numbers are in the domain of f 5. 1 is in the domain of f 6. f(x) is never negative 7. f(x) is never positive...
September 23, 2010

physics
The pilot of an airplane traveling 180 km/h wants to drop supplies to flood victims isolated on a patch of land 125 m below. The supplies should be dropped how many seconds before the plane is directly overhead? ______s
September 21, 2010

physics
A ball is thrown horizontally from the roof of a building 60 m tall and lands 45 m from the base. What was the ball's initial speed? _______m/s
September 21, 2010

Chemistry
Than from here I need to find: Using the volume of solvent calculated in step 1, calculate how much sulfanilamide will remain dissolved in the mother liquor after the mixture is cooled to 0 degree Celsius? Can you please explain?
September 21, 2010

Chemistry
thank you!
September 21, 2010

Chemistry
Please help the question that I got is: Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at 78 degree Celsius. Knowing that solubility of sulfanilamide is 210 mg/ml at 78 degree Celsius, 14mg/ml at 0 Degree Celsius. please explain.
September 21, 2010

Science
thank you
September 21, 2010

algebra 8th
ok gat it
August 31, 2010

algebra 8th
YOU THINK? BUT I HAVE TO DO ALL THE PROBLEM
August 31, 2010

algebra 8th
ADD OR SUBTRACT> 5.2-2.5 HOW DO I DO THIS?
August 31, 2010

chem
What is the total pressure in mm Hg of a gas mixture containing argon gas at 0.25 atm helium gas at 350 mm,Hg, and nitrogen gas at 360 torr.
July 10, 2010

chem
What is the volume in liters of 3.2 moles methane gas, CH4, at 12degrees C and 1.52 atm?
July 10, 2010

chem
An airplane is pressurized to 650mmHg , which is the atmospheric pressure at a ski resort at 1.30×10^4 altitude.If air is 21 % oxygen, what is the partial pressure of oxygen on the plane?
July 10, 2010

biochemistry
an intramalecular meds is given at 5.0mg/kg of body weight. if you give 425mg of medicatioon to a pt. what is the ppTIENT weight?
July 5, 2010

biochemistry
ordered 1.0g of tetracycline to be given every 6 hours. on hand 500mg. how many will we need for 1 days treatment?
July 5, 2010

Literature
During the Renaissance, people rediscovered the literature of the past. True or False? At that time there was an enormous renewal of interest in and study of classical antiquity. So True, right? Just wanna make sure, Thanks.
July 3, 2010

personal finance
Sue and Tom Wright are assistant professors at the local university. They each take home about $42,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen, are 11 and 9. Were either one to die, they estimate that the remaining family...
June 27, 2010

personal finance
Sue and Tom Wright are assistant professors at the local university. They each take home about $42,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen, are 11 and 9. Were either one to die, they estimate that the remaining family...
June 27, 2010

chem
Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 21.5 g sample of a metal that absorbs 685 J when temperature increases from 42.1^\circ C to83.2^\circ C.
June 10, 2010

chem
Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 18.5-\rm g sample of tin that absorbs 183 {\rm J} when temperature increases from 35.0 ^\circ \rm C to 78.6 ^\circ \rm C.
June 10, 2010

bio
A typical adult body contains 55 \% water. If a person has a mass of 70.0 kg, how many pounds of water does she have in her body?
June 10, 2010

Biology
can anyone please help me answer this question: How is DNA put together into chromosomes?
June 5, 2010

chemistry
Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons. Mg(s) → Mg2+(aq)
June 1, 2010

biology
Does asexual reproduction of sponges depend on time of year, availability of food, or other factors?
May 30, 2010

Biology
sorry, this link does not answer these specific questions!
May 30, 2010

Biology
Under what conditions does asexual reproduction in sponges occur? Does it depend on time of year, availability of food, or other factors?
May 30, 2010

Science
What is the pH of a 2.62 x 10^-2 M HBr solution? thanks
May 25, 2010

chem can u check answer please
thanks so much
May 23, 2010

chem can u check answer please
Which is NOT a chareteristic property of acids? A: react with carbonate to yield CO2 gas B: taste sour C: neutralize bases D; turns litmus red to blue E:reacts with metal to yield H2 gas I reckon its D because isnt it the other way around ? Blue to red ...not...red to blue Any...
May 23, 2010

chem can u check answer please
what is the hydrogen ion concentration of an aqueous solution with a pOH of 9.262? I got 5.47X 10 ^-10 is this correct? Thanks Andy
May 23, 2010

chem can u check answer please
the solubility of silver sulfate in water is 0.223%(w/v) at 35 degrees celsius.calculate the solubility product of this salt at this temp. I got 1.46 X 10^-6 M is this right please thanks Andy
May 23, 2010

Chem/science
what is the ph of 2.62 x 10 ^-2 M HBr solution? I get 5.94 is that right? thanks andy
May 23, 2010

Chem/science
What is the conjugate acid of HC5H6O4-?? Is it HC5H6O42-?? thanks andy...
May 23, 2010

Chemistry
Why can't benzene dissolve sodium chloride?
May 18, 2010

3rd grade
Ineed help with the synonyms and antonyms ex. perfect, frawless is this an antonym or synonym?
May 17, 2010

SCIENCE?CHEMISTRY***
Dr Bob each time i do a problem on this site I have to print out answer....is there any way you know how to save it to usb stick???? I cant for the life of me find a save feature... also how do YOU when you give us a link to a site ...make it appear in blue and all we have to ...
May 16, 2010

SCIENCE?CHEMISTRY***
thanks dr bob Andy
May 16, 2010

SCIENCE?CHEMISTRY***
Am using the inventory method at moment but am stuck on how fill i the inventory for __Agl+__Fe2(CO3)3--> __Fel3+__Ag2CO3 I think the brackets are throwing me Hows this element b4 after ------------------------------------ Ag 1 2 l 1 3 Fe 6 1 CO 3 3 I dont know if this is ...
May 16, 2010

SCIENCE?CHEMISTRY***
well done thanks... Andy
May 14, 2010

SCIENCE?CHEMISTRY***
an 56 Fe 2+ particle has how many protons neutrons amd electrons??? 56 2+ Fe Thanks Andy
May 14, 2010

SCIENCE?CHEMISTRY***
how many dozens of dust particles are in 2.45 g if each particle has a mass of 2.51 x 10^-4 grams...? I dont have a clue!!!!!! Thanks Andy
May 14, 2010

SCIENCE?CHEMISTRY***
thanks..... andy
May 14, 2010

SCIENCE?CHEMISTRY***
DR Bob, can you go thru the steps to work this out please.... how many grams of alcohol with a density of 0.900 g/cm ^3 (cm cubed) will have the same volume as 20.0g of mercury,with a density of 13.6 g/cm ^3 Do you have to find the volume of mercury first??? I know the answer ...
May 14, 2010

chemistry
thanks..andy
May 13, 2010

chemistry
The solubility of MnS was found to be 0.000963 g per 700 mL of water. Calculate the solubility product constant (Ksp) for MnS. MnS (s)=Mn2+ (aq) + S2- (aq)
May 13, 2010

chemistry
The solubility product constant (Ksp) for the dissolution of PbSO4 as represented by the chemical equation is 1.7x10-8. PbSO4 (s)= Pb2+ (aq) + SO42- (aq) Calculate the mass (g) of PbSO4 that dissolves in 1100 mL of water.
May 13, 2010

SCIENCE/CHEM
thanks so much....andy
May 12, 2010

SCIENCE/CHEM
Dr Bob Is it true that only TWO molecules of water are required to balance the equation for the reaction of HCL with Calcium Hydroxide.(calcium chloride is the other product....why??? Thanks andy
May 12, 2010

SCIENCE/CHEM
thanks.... andy
May 12, 2010

SCIENCE/CHEM
Dr BOB, Can you show me how to do the balanced equation please I am shocking at them Thanks AndyWhats the simple way to explain balancing equations so i get it please....because i am horrible at them... Thanks andy
May 12, 2010

SCIENCE/CHEM
the purity of zinc is to be determined by measuring the amount of hydrogen formed when a weighed sample of zinc reacts with an excess of HCL acid.the sample weighs 0.198 grams. what amount of hydrogen gas at STP will be obtained if the zinc is 100% pure? need a metric answer ...
May 12, 2010

SCIENCE/CHEM
thanks..... andy
May 12, 2010

SCIENCE/CHEM
the volume of a sample of gas is 650.ml at STP. what volumes will the sample occupy at 0.0degrees celsius and 950.torr??? is it 650.ml?
May 12, 2010

SCIENCE/CHEM
thanks so much ...andy
May 12, 2010

SCIENCE/CHEM
so 2 X4 ^2 = 32 so 32 is correct ....... thanks andy
May 12, 2010

SCIENCE/CHEM
thanks...andy
May 12, 2010

SCIENCE/CHEM
how many electrons can be contained in all orbitals with n=4??????
May 12, 2010

SCIENCE/CHEM
thanks ...will practice and practice and practice.....andy
May 12, 2010

SCIENCE/CHEM
I suck at balancing!!!! Sorry Dr BOb you will have to take me on a slow journey on this one....Thanks andy
May 12, 2010

SCIENCE/CHEM
when the following equation is balanced , what is the sum of the co-efficients? AL2(SO4)^3+Ca(OH)2-->Al(OH)3+CaSO4
May 12, 2010

science /chem
thanks so much....andy
May 12, 2010

science /chem
1.250X10^3 ....hows that???
May 12, 2010

science /chem
thanks I think I acn do that one now...Regards Andy
May 12, 2010

science /chem
1250.37986 rounded to four significant figures is ??????
May 12, 2010

SCIENCE/CHEM
thanks...... andy
May 12, 2010

SCIENCE/CHEM
aha....# of prot and electrons =35 same as atomic number. #of neutons=mass number - atomic number=44 neutrons... so 35 protons,44 neutrons and 35 electrons .....hows that???
May 12, 2010

SCIENCE/CHEM
does that narrow it down to 35 prot,79 neutrons and 35 electrons? Soory bit lost on electrons... Andy why was there two choices for mass number???
May 12, 2010

SCIENCE/CHEM
Bromine exists as a mix of bromine 79 and bromine 81 isotopes. an atom of bromine 79 contains: 35 prot.44.neutr.35 electrons 35 prot.and 35 electrons only 44 prot.44 elect and 35 neutr. 35 prot.79 neutr. and 35 electrons 79 protons 79 electrons and 35 neutr. which is correct ...
May 12, 2010

MATHS !!!
thanks..... andy
May 12, 2010

MATHS !!!
convert 3.22 mm into cm please
May 12, 2010

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