Questions Asked on
February 20, 2007

chem
which of the following is a chemical reaction? A) propane forms a flame and emits heat as it burns. B) Acetone feels cold as it evaporates from the skin. C) Bubbling is observed when potassium carbonate and hydrochloric acid solutions are mixed. D) Heat is
asked by Jenn 
physics
A ferry boat is 4.0 m wide and 6.0 m long. When a truck pulls onto it, the boat sinks 4.00 cm in the water. What is the combined weight of the truck and the ferry?
asked by bobert 
physics
an 800 N person stands on a scale in an elevator. What is his apparent weight when the elevator is accelerating upward at 2 m/s^2? B) what5 is his apparent weight when the elevator is acc. downward at 2m/s^2? c) what is his apparent weight when the
asked by Sabrina 
algebra , help
Can someone help me set up the equations thanks. Directions: Solve each of the following applications. Give all answers to the nearest thousandth. Problem: Geometry. The length of a rectangle is 1 cm longer than its width. If the diagonal of the rectangle
asked by jas20 
Chemistry
Can you balance this equation please? Fe2O3 + CO yeilds Fe + CO2 Fe2O3 + CO ==> Fe + CO2 Rule: balance by changing coefficients. You may not change subscripts. Look at the Fe atoms. There are 2 Fe atoms on the left and only 1 on the right; therefore, we
asked by mZ. YoU 
math help,algebra
Okay this is what i have to do but i think i am doing something wrong. directions are: Identify the axis of symmetry, create a suitable table of values, and sketch the graph (including the axis of symmetry). The problem is: y = x^2+6x2 so i did my table
asked by jas20 
ap chem
a solution is prepared by dissolving 4.87 g of sodium dichromate in 25.0 ml of water. (d=1.00g/mL).calculate a. the mass percent of sodium dichromate in the solution. b. the mass percent o water in the solution. c the mole fraction of sodium dichromate in
asked by just 
CHEMISTRY
a solution is made by diluting 175 mL of 0.238 M aluminum nitrate, Al(NO3)3, solution with water to a final vlume of 5.00x 10^2 mL.calculate the following. a. the molarity of aluminum nitrate, aluminum ion, and nitrate ion in the diluted solution B. the
asked by MeLi 
English
I have an sentence. Beth lost her glasses at the library. I have to replace HER GLASSES with a pronoun Thank you for using the Jiskha Homework Help Forum. You need a direct object pronoun = them.
asked by Barb 
math
find out the ratio 3 quarts to 4 pints as a fraction in simplest form. the units must be the same. Quart = 2 pints Convert your quarts to pints and divide by the 4 pints. I hope this helps. Thanks for asking.
asked by ninaprtyrtyvfbhf 
physics
an object with mass 10kg is at rest. It explodes into 4 pieces. A peice with mass 3kg travels NORTH at 5m/s, another piece 5kg travels at 30(degrees) NORTH of EAST at 2 m/s, and another piece 1.1kg travels 60(degrees) NORTH of WEST at 7 m/s. Find the mass
asked by danielle 
Physics
Is it possible to orient a current loop in a uniform magnetic field such that the loop will not tend to rotate?
asked by Mikey Bobo 
Integral
That's the same as the integral of sin^2 x dx. Use integration by parts. Let sin x = u and sin x dx = dv v = cos x du = cos x dx The integral is u v  integral of v du = sinx cosx + integral of cos^2 dx which can be rewritten integral of sin^2 x = sinx
asked by drwls 
physics (newton's laws)
A 5.00 kg object placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fasted to a hanging 9.00 kg object. Find the acceleration of the two objects and the tension in the string. First, there is just one
asked by Eric (please help me) 
simple intrest
My daughter brought home a work sheet and I have no clue where to begin to help her and she seems to have no clue either. the questions are 1. Find the final balance in each account. $800 at 4.25% simple intrest for 6 years 2. $2,000 at 6% compounded
asked by Veronica 
Chemistry
I have a certain concentration of NaCl (in mg/L). I have to convert it to ppm Na+. I read some of the previous posts, and I understand that if I don't know the density, I should assume that 1ppm = 1mg/L. Does this also apply to ppm Na+ since there is 1 Na+
asked by Maggie 
Chemistry
I have one more question DrBob, I have draw a structure of this polymer CH2=CHCHOH ' CH3 and identify the monomer units. Would the mononer unit be this: CH2CHCHO ' CH3 AND WOULD THIS POLYMERIZATION BE A CONDENSATION TYPE? PaulaI am not an organic
asked by Paula 
BIOLOGY
IS A PLANT CELL AN EXAMPLE OF A UNICELLULAR ORGANISM? iS AN ANT AN EXAMPLE OF MULTICELLULAR ORGANISM? What are Plants Plants are multicellular photosynthetic organisms that are believed to have evolved from green algae. Both groups have chlorophylls a and
asked by JOANNE 
sentence fragment
What is the best way to rewrite the following sentence fragment? Richard III supposedly had the young princes murdered. Never found out what really happened to them. Research has never proven what caused their deaths. In my opinion, you should rewrite it
asked by mike 
Bus law
Alex was on a coasttocoast trip by automobile. While passing through Ohio, Alex had a flat tire. It was fixed by Sam’s Turnpike Service Station, and later, while Alex was driving in Indiana, the tire came off and Alex was injured. Alex was hospitalized
asked by mike 
Chemistry
WHat are the structural formulas for glycerin, hexane, and ethanol. Do these structural formaulas support the solubility data obtained?? It is almost impossible to draw structural formulas on the computer. In line formulas may help. But you need to refine
asked by Dave 
Physics
Two forces act on a 0.200 kg ant: F1 =(3.00i  8.00j)N and F2=(5.00i + 3.00j)N. Express the net acceleration of the ant in unit vector notation. The resultant force is 8.00 i  5.00 j Newtons. Divide that by the mass (0.2 kg) for the acceleration vector,
asked by Daniel 
Chemistry
Which of the following does form a Group II cation? lead iron cobalt nickel How do you figure this one out? You must know what is in group II. Fe, Co, and Ni are in group III. Pb is in both group I and group II. Pb ppts as the chloride in group I and as
asked by Chemistry 
Chemistry
Oops, I accidently posted this as an answer to my previous question, when in fact it was another question. ________________ How do I convert mg/L NaCl to mg/L Na^+? What I tried was: ppm Na^+ = mg/L Na^+ = 1mg NaCl/L * (22.99gNa/35.45gCl) = 0.649 ppm Na^+
asked by Maggie 
Health
Does saying: "increases the user’s risk of heart arrhythmia and respiratory failure" Mean the same thing as: "Decreased heart and respiratory function" It doesn't mean the same thing in my book. If it increases the RISK, that means to me that SOME
asked by Aaliesha 
Chemistry
Each Rolaids tablet contains .550 g of calcium carbonate and .110 g of magnesium hydroxide. Kroger Extra Strength antacid tablets contain .750 g of calcium cabonate per tablet. What is the neutralizing ability per gram for each tablet in mol/g? Might not
asked by Bob 
Algebra I
The distance an object falls is directly propotional to the square of the time it has been falling. Afterr 6 seconds it has fallen 1296 feet. How long will it take to fall 2304 feet? I can't even imagine how to figure tis out. I would appreciate your help.
asked by DANIELLE 
Algebra 1
Simplifying Radicals, Use the quotient property to simplify the expression. 3 times the square root of 6/3 3*sqrt(6/3) is the same thing as saying 3*sqrt(2) Your problem: 3√(6/3) is the same as 3√6/√3 To rationalize the denominator, multiply both the
asked by Steve 
math
the vertices of triangle abc are A(2,3) B(10,3) and C(4,10. prove by coordinate geometry that the median to side AB is also the altitude to side BC?
asked by sean 
I need 2 fix these prob. b4 they get 2me on test!
A father gives his son a ride by pulling a sled across the rough snow. The father runs across the snow with a constant acceleration while pulling the sled at F = 75.0 N, at 30 deg. above the horizontal. The combined mass the sled and son is 30.0 kg. The
asked by Matt (Newton's laws) 
chemistry.
The concentration of hydrogen sulfide, H2S, in hot springs is relatively high. This accounts for the rottenegg smell around the "mud pots" in Yellowstone National Park. The solubility of hydrogen sulfide in water at 25 degrees Celsius is 0.0932 M at 1.00
asked by CRISTINA 
chemistry
22.0 ammonium chloride decomposes to form hydrochloric acid, and ammonia. at the conclusion of the reaction, the scientist collects 10.24L of ammounia measured at 52 degrees Celsuis and 105.3 kPa. What was the percent yield of the reaction? Write the
asked by betty 
calculus
Find the derivative using the chain rule. f(x) = ((3x7)/(6x+3))^4 f '(x) = let u= 3x7 v= (6x+3)^4 Then d(uv)= u dv + v du du= 3 dv= 4(6x+3)^5 (6) so what's f'(x)? (thanks for your help) Goodness. f'(x) is d(uv) I will be happy to critique your work or
asked by jessica 
math, please somebody help me
Given the function f(x) = x4 , and suppose g(x) is some other function of x. (a) Then the function F(x) = (g(x))^4 is the same thing as ... a. f '(g(x)) · g'(x) b. f(g(x)) c. f '(x) d. f '(g(x)) e. g(f(x)) (b) By either the extended power or the chain
asked by jessica (the other one) 
homework help
chapters 1011 1. what brqve things does atticus do in chapter 10? why are jem and scout shocked? 2. what did jem dp when mrs dubose said atticus"lawed for !@#$%^&ers" 3. what did jem learn from his encounter with mrs dubose and folowwing her death? thanx
asked by lala 
Physics
The system of blocks of masses m1=3kg and m2 = 1.80 kg are connected by a string as shown. Mass m rests on a rough surface of unknown coefficient of kinetic friction. After the masses are released, they move with an acceleration of 2.80 m/s^2 (m1 moves to
asked by Matt 
history
what is democracy and why is it importent and also why is it btter than comralisam and fashison.also a peom 0n democracy thank you Thank you for using the Jiskha Homework Help Forum. Here is a site on the history of "democracy" which is what we have in the
asked by jesmira 
science
Having a hard time understanding "representative particles". ie. which are atoms, compounds etc. For example, what is the representative particle for sodium fluoride? carbon monoxide? Atoms are the smallest unit of an element. Molecules are composed of two
asked by mark 
wow
(It's about time somebody got rid of bobpursley, he was making rude comments on everybody's page!) That's an imposter. i did!he kept blaming at me when i was asking for some hints for my hw questions! and he said im "stupid" and "idiot"..if he doesnt wanna
asked by Me 
sequence
give the general term of the sequence 1,2,3,5,10,15,25,... Type "integer sequences" in google: Fibonacci numbers written in base 8: 1, 2, 3, 5, 10, 15, 25, 42, 67, 131, 220, 351, 571, 1142, 1733, 3075, 5030, 10125, 15155, 25302, 42457, 67761, 132440,
asked by sadhana 
Please Check(Math)
d+7/d^2+49= / (d+7) (d+7)*I got the bottom but I don't know what to put at the top...please help!!! Please HElp Me!!Sorry,I am trying to e patient... The d+7 on top cancels with one of the d+7 on the bottom and you are left with 1/(d+7)
asked by steve the hippo 
I need 2 get these prob. b4 they get 2 me on test!
A father gives his son a ride by pulling a sled across the rough snow. The father runs across the snow with a constant acceleration while pulling the sled at F = 75.0 N, at 30 deg. above the horizontal. The combined mass the sled and son is 30.0 kg. The
asked by Matt (Newton's laws) 
Chemistry...kind of
How do medications such as Pepcid AC and Xantac treat acid reflux? If anybody can find a website that explains this it would be great! I'll help you if you help me...please.! http://www.answers.com/topic/famotidine
asked by Bob 
Repost 2 PLz Help
6y/y^22y24=? *I don't get it at all!!! You need parentheses around portions of this thing so we know what the problem is.
asked by steve the hippo 
Drugs
I asked a question earllier related to whether my idea of an inhalant was correct or not. Someone mentions something about vehicle. my question is: vehicle? Vehicle in this context means a way of getting something from one place to another. An inhalant is
asked by Aalecia 
math
what is the money amount of 20/100? 20/100 A 100th of a dollar is a cent. Does that help a little more? Thanks for asking.
asked by mindy 
substitution method
3x+y=5 x+2y=0 Your equations: 3x + y = 5 x + 2y = 0 Let's solve the second equation for x: x = 2y Now let's substitute 2y for x in the first equation to solve for y: 3(2y) + y = 5 6y + y = 5 7y = 5 y = 5/7 Now let's substitute 5/7 for y in the
asked by sooto 
calc
A widget factory has fixed costs of 35 billion dollars and variable costs of 781 million dollars per widget. The revenue (in $ billions) from selling x number of widgets is given by the following for x between 0 and 60. R(x) = 0.11(60x  x^2) What is the
asked by Lia 
physics HELP!!
3. A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30degree
asked by Katrina 
physics
Is copper (Cu) the same as copper64 (Cu64)? Cu64 is a radioactive isotope of copper. Its half life is 12.8 hours. During the few days it is around, it behaves chemically like any other copper isotope, but eventually it all turns into something else. The
asked by naomi 
physics again
and if they are the same (refer to the question before by me  copper and copper 64 being the same thing?)is it a radioactive isotope? thanks That was part of my previous answer. Yes, Cu64 is radioactive. You need a handbook or table of radionuclides to
asked by naomi 
mars
who big is it http://www.lessonplanspage.com/more/205mar.html Scroll down to How big is it? =)
asked by martynas 
History
Explain America's foreign policy following the spanishamerican war? http://www.google.com/search?q=foreign+policy+after+spanish+american+war&rls=com.microsoft:enus:IESearchBox&ie=UTF8&oe=UTF8&sourceid=ie7&rlz=1I7SUNA There are several websites in here
asked by tina 
Chemistry
Can you please help me to work out the addreviated structural formulae of hydrolysis of tocainide? Won't it be the NH2 group that hydrolyzes? ArNH2 + HOH ==> ArNH3^+ + OH^ Check my thinking. Thanks That is exactly what I thought it would be. Thanks again
asked by Paula 
math
i really need to know what.... 4 to the power of 77 is... 477 = 2.28360 x 1046 according to my calculator. i don't know how to do factors with two digit numbers. Please click Post a New Question, put Math in the subject line, and post your question. It
asked by Kimmy 
Math(Please Help!)
6y/y^22y24=? *I don't get it at all!!! Answered in another post.
asked by steve the hippo 
math 123
solve the equation by factoring 3x^28x3=0 (3x+1)(1x3)=0 Now solve each for zero: 3x+1=0 and 1x3=0 Lance can you help me.?
asked by jonni 
Chemistry
If one gram of sodium bicrbonate made it into your stomach from 1 teaspoon of baking soda, how many moles of acid could it neutralize? mols NaHCO3 = grams/molar mass. mols HCl=mols HCO3%
asked by Bob 
math
which is not a common factor for 36 and 54 which what? 4, 5, 7, 8
asked by D'anlyn eiland 
Calculus help
\documentclass{article} \usepackage{amssymb,amsmath,amscd,concmath} \pagestyle{empty} \begin{document} \begin{equation*}\int_{1}^{3} [(e^3/x)/(x^2)]\, dx\end{equation*} \end{document} Sorry,the html format does not work... How to find the integral of
asked by Linda 
Health
What is a heart palpitaltion? A palpitation is an extra beat, or beats, in your heart, so that you feel like your heart is racing, beating irregularly.
asked by Aalisha 
substitution method
x4y=14 2x=y+1 Let's look at your two equations. x  4y = 14 2x = y + 1 Let's solve the second equation for y: y = 2x  1 Now let's substitute (2x  1) for y in the first equation: x  4(2x  1) = 14 x  8x + 4 = 14 9x + 4 = 14 9x = 18 x = 2
asked by seth 
Math
Consider the following where s is in feet and t is in seconds. s(t) = t^3 + 4t^2 + 6t + 4 (a) Find v(t). v(t) = (b) Find a(t). a(t) = (c) Find v(3). (d) Find a(3). v(t) is the first derivative of s(t). a(t) is the second derivative of s(t). I will be happy
asked by India 
social studies
unscramble these egrvwneoir Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =) "vinegrower"
asked by carol 
physical chemistry
I calculated that the denaturation enthalpy and entropy changes for chymotrypsin are: H = 418 kj/mol S= 1.32 kj/mol(K) Assume that, in the denatuartd state, each amino acid had three possible orientations. estimate number of amino acid in chymotrypsin
asked by Vicky 
Physics
The tension on a string from which a 5.00kg object is suspended in an elevator is T=(44.0j)N. What is the acceleration of the elevator? Specify the acceleration in unit vector notation. T  Mg = M a with positive force upward. a = T/m  g = 8.8  9.8 =
asked by Sabrina 
Bailey
I can't figure this out. Please help! Estimate 16 20/21 * 28 3/7  4 13/25 + 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 Someone please help! 17 * 28  5 + 8 would give you an estimate. However, since you don't have
asked by Math 
the french revolution.
One reason that many people began questioning the idea of a monarchy was the excesses of Louis XVI. Check this site for more information. http://en.wikipedia.org/wiki/French_Revolution WHY DID MANY PEOPLE BEGIN TO QUESTION THE IDEA OF A MONARCHY?
asked by Ms. Sue 
Chemistry
Al3+ and Pb2+ act as acids or bases in acidic or alkaline environment. True or False? I think this is true because they are amphoteric, but I am not sure. yes. They are amphoteric.
asked by Chemistry 
help!
change a material from solid to liquid. (3 words) melting?
asked by krazykid 
Repost PLease Help!
d+7/d^2+49= / (d+7) (d+7)*I got the bottom but I don't know what to put at the top...please help!!! answered below
asked by steve the hippo 
French 1
Re write the following as questions using in version 1.A’ qui estce que vous te’le’phone? ANSWER Vous telephonez estce aqui 2. Elle danse bien. Answer Danse bien elle? In complete French sentences say that the people do not do the following
asked by DANIELLE 
Math Repost!!Please Help!!!!
6y  y^22724 well it should simplify to (6y)/(y^1) which then changes to y(6y) which then equals y(6y)=0 then you set both parts equal to zero and solve for xero y=0 and/or (6y)=0 so y=0 or y=6 Did you mean for this problem to be this: 6 
asked by steve the hippo 
Billy
Estimate the difference by rounding to the hundred : 6238  4197 Would the answer be 2000? 62004200=2000
asked by Math Question 
grammar
What is the correct way to write this sentence. Each of the instructors are attending the conference next weekend. or Each of the instructors is attending the conference next weekend. Each ... is ... Each is always singular. =) Thanks for the help!!!!
asked by mike 
eth 125
Consider these questions: What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? (Schaefer, 2006, p. 352) Choose from any of the following topics when considering
asked by Trenet 
MATH!!!
Consider the following where s is in feet and t is in seconds. s(t) = t3 + 4t2 + 6t + 4 (a) Find v(t). v(t) = (b) Find a(t). a(t) = (c) Find v(3). (d) Find a(3). see above. Please stop posting under different names. WHAT?!!
asked by Help me! 
english
difference between prejudicial and nonprejudical rhetoric Thank you for using the Jiskha Homework Help Forum. First of all, any good dictionary will help you with the meanings. rhetoric = art of oratory, or speaking well prejudicial = leading to premature
asked by robin 
algebra,help
I am clueless about this one...can someone help me with it ...thanks Business and finance. The demand equation for a certain type of printer is given by D = 200p + 35,000 The supply equation is predicted to be S= 6p^2 + 400p – 20,000 Find the
asked by jas20 
Science
What compound was considered more precious that gold in ancient Rome? i think it's aluminum, i found it in google In my Google search, there was no mention of aluminum as a precious metal. Rather silver, gold and bronze were mentioned, especially in
asked by Ann 
Science
What are examples of igneous rocks and their uses? http://en.wikipedia.org/wiki/Igneous_rock http://www.google.com/search?hl=en&lr=&as_qdr=all&q=%22+igneous+rocks+are+used+for%22+&btnG=Search
asked by ?~?~^ 
calc
Please help me you guys, this is the 3rd time I have posted this question. Is anybody going to help me with this problem? A widget factory has fixed costs of 35 billion dollars and variable costs of 781 million dollars per widget. The revenue (in $
asked by Lia 
general
general differences and similarites between australia and united states of americal Australian government: http://www.google.com/search?q=australia+government&rls=com.microsoft:enus:IESearchBox&ie=UTF8&oe=UTF8&sourceid=ie7&rlz=1I7SUNA (Skip the second
asked by Nikki 
Drugs
I think I know the answer but it is just a wild guess. Inhalants are not classified as either a stimulant or depressant, because there is such a wide range of inhalants that some are classified in different groups. Therefore, some inhalants are stimulants,
asked by Aalecia 
Math.
I JUST can't figure out the answer! Can someone please help me? What is the next number in this sequence? 52, 28, 33, 63, 73, 23, 56,... Ah ha! Nevermind, I just got it, 89, I think :) Thanks anyway :)
asked by Emily 
Spanish
I need help with the subject verb agreement for this assignment: 1. It eats 2.It hears 3.It attacks 4.It doesn't eat 5.It doesn't hear 6.It doesn't attack 7.They eat 8. They hear 9. They attack 10.They don't eat 11. They don't hear I'm using the powerglide
asked by Aubrey 
EnglishShakespeare
As an introduction to Shakespeare, we're doing a project on medieval guilds. Can anybody help me on where to search information on the Seadogs guild? I've been looking and all I've gotten was info on the movie, or a modern guild. Thank you :) "16001800
asked by Nikki 
math
Find the second derivative. y = sqrt(3x+4) I will be happy to critique your work. We don't do it for you. Thanks. Please post under one name. Thanks. who are u?
asked by abc 
Government
i need help on 2 questions. heres the scenario, Connie Craft lives in Stockton, which is located in San Joaquin County in California. She stole a new computer from her neighbor's home and was arrested within an hour in her own home, where the computer was
asked by Michelle 
French 1
In complete French sentences say that the people do not do the following activity given 1.
asked by DANIELLE 
calculus
Please help, I have no idea where to start. Use the quotient rule to find the derivative. f(x)= ((x+4)/(x2)) f '(x) = Thank u!
asked by Me 
French 1
1.
asked by DANIELLE