# Questions Asked onFebruary 20, 2007

1. ## 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

2. ## 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?

3. ## 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

4. ## 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

5. ## 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

6. ## 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+6x-2 so i did my table

7. ## 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

8. ## 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

9. ## 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.

10. ## 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.

11. ## 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

12. ## Physics

Is it possible to orient a current loop in a uniform magnetic field such that the loop will not tend to rotate?

13. ## 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

14. ## 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

15. ## 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

16. ## 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+

17. ## Chemistry

I have one more question DrBob, I have draw a structure of this polymer CH2=CH-CH-OH ' CH3 and identify the monomer units. Would the mononer unit be this: CH2-CH-CH-O ' CH3 AND WOULD THIS POLYMERIZATION BE A CONDENSATION TYPE? Paula--I am not an organic

18. ## 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

19. ## 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

20. ## Bus law

Alex was on a coast-to-coast 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

21. ## 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

22. ## 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,

23. ## 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

24. ## 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^+

25. ## 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

26. ## 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

27. ## 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.

28. ## 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

29. ## 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?

30. ## 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

31. ## chemistry.

The concentration of hydrogen sulfide, H2S, in hot springs is relatively high. This accounts for the rotten-egg 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

32. ## 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

33. ## calculus

Find the derivative using the chain rule. f(x) = ((3x-7)/(6x+3))^4 f '(x) = let u= 3x-7 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

34. ## 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)

49. ## 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 30-degree

50. ## 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

51. ## 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, Cu-64 is radioactive. You need a handbook or table of radionuclides to

52. ## mars

who big is it http://www.lessonplanspage.com/more/205mar.html Scroll down to How big is it? =)

53. ## History

Explain America's foreign policy following the spanish-american war? http://www.google.com/search?q=foreign+policy+after+spanish+american+war&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA There are several websites in here

54. ## 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

55. ## 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

6-y/y^2-2y-24=? *I don't get it at all!!! Answered in another post.

57. ## math 123

solve the equation by factoring 3x^2-8x-3=0 (3x+1)(1x-3)=0 Now solve each for zero: 3x+1=0 and 1x-3=0 Lance can you help me.?

58. ## 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%-

59. ## math

which is not a common factor for 36 and 54 which what? 4, 5, 7, 8

60. ## 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

61. ## 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.

62. ## substitution method

-x-4y=-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

63. ## 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

64. ## social studies

unscramble these egrvwneoir Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =) "vinegrower"

65. ## 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

66. ## 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 =

67. ## 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

68. ## 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?

69. ## 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.

70. ## help!

change a material from solid to liquid. (3 words) melting?

72. ## French 1

Re write the following as questions using in version 1.A’ qui est-ce que vous te’le’phone? ANSWER Vous telephonez est-ce aqui 2. Elle danse bien. Answer Danse bien elle? In complete French sentences say that the people do not do the following

6-y --------- y^2-27-24 well it should simplify to (6-y)/(y^-1) which then changes to y(6-y) which then equals y(6-y)=0 then you set both parts equal to zero and solve for xero y=0 and/or (6-y)=0 so y=0 or y=6 Did you mean for this problem to be this: 6 -

74. ## Billy

Estimate the difference by rounding to the hundred : 6238 - 4197 Would the answer be 2000? 6200-4200=2000

75. ## 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!!!!

76. ## 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

77. ## 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?!!

78. ## english

difference between prejudicial and non-prejudical 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

79. ## 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

80. ## 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

81. ## 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

82. ## 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 \$

83. ## 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:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA (Skip the second

84. ## 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,

85. ## 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 :)

86. ## 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

87. ## English-Shakespeare

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 :) "1600-1800

88. ## 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?

89. ## 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

90. ## French 1

In complete French sentences say that the people do not do the following activity given 1.