Posts by ben

Total # Posts: 1,050

1. Chemistry

Ejected neutrons sustain the fission reaction by serving as reactants to split additional fissionable nuclei, which roduce additional neutrons, which can slit additional dissionable nuclei, and so on. The result is a what???
2. Mr. bobpursley

Thank you for your time and frankness. I agree with you.
3. chemistry f/u

Thank you Mr. bobpursley. I am still unclear on a few things. massethanol*Ceth(Tf-7.7)+masswater*Cwater*(Tf-27.1)=0 solve for Tf 17.75g ethanol x(Tf-7.7)+31.6g water x (Tf-27.1)=0 This is the algebra that I do not know how to derive to move to the next step. Do I add it all to...
4. Chemistry

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...
5. Chemistry

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...
6. Dr. Bob

Thank you kind sir for guiding my work on the last question. You gave me the means to answer the question correctly without giving me the answer. Your expertise is greatly appreciated. If you tutor online, I would gladly pay for your guidance if you are interested
7. Chemistry

Thank you very much for your assistance preemptively. My question has to do with law of conservation of mass. A 50g sample of iron reacts with 21g of oxygen to from how many grams of iron oxide? Is the answer maybe 71g or 29g. This is stumping me.
8. chemistry

This has to do with law of conservation of mass I believe but it stumps me. 50g or iron reacts with 21g of oxygen to form how many gram of iron oxide? Is the answer 71g or 29g
9. Pre-Calc

Find [4(cos115+isin115)]^6
10. calculus

Why did the 2ðx^2+108/x^2 become 2ðx-108/x^2
11. calculus

A large soup can is to be designed so that the can will hold 54pi cubic inches of soup. The radius of the can is "x" inches and the height of the can is "h" inches. Find the values for the radius and the height such that the amount of metal needed is as ...
12. MATH

1) During the two months of the summer holiday, you find a summer job that pays \$160 per week with a \$10 a week raise. How much money will be made by the end of the summer? 2 Your grandmother offers you \$1 on the first day of March break and offers to double it each day of the...
13. derivative

Find the derivative. 11) f(t)=(1)/(sqrt(8t-3)) 12) g(t)= ((4t-3)^2)/ ((5t+1)^4) Thanks.
14. calculus

18) The demand equation is x + 1/6p - 10+0. Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at p=50. a) 5; elastic b) 1/9; inelastic c) 7/6; elastic d) 6; elastic I choose answer A. Is that correct?
15. maths

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
16. maths

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
17. maths

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
18. physics

i need a mathematical relationship between density and height
19. Algebra 2

Find the distance between the points (12, 8) and (4, 2). 100 units 14 units 10 units –10 units Find the midpoint of the points (3, 1) and (7, –5). (1, 6) (2, 1) (2, –3) (5, –2) Find the vertex and focus of the parabola whose equation is 4y = x2 + 4. V(0, 4...
20. Algebra 2

1. Find the midpoint and the distance between the points (8,–6) and (13, 4). 1. (4, –3), 10 units 2. 3. 4. (10, –1), 9 units 2. Find the vertex and the focus of the parabola with the equation 4y = x2 – 12x + 52. 1. V(6, 4), F(6, 5) 2. V(6, 4), F(7, 4) 3. V(...
21. Math Help

The fare for riding in a taxi is a \$3 fixed charge and \$0.80 per mile. The fare for a ride of d miles is \$6.75. Write an equation that could be used to find d.
22. Algebra

Par Manufacturing manufactures steel rods. Suppose the rods ordered by a customer are manufactured to a specification of 0.5 in. and are acceptable only if they are within the tolerance limits of 0.49 in. and 0.51 in. Letting x denote the diameter of a rod, write an inequality...
23. math

well for the first one i'm pretty sure it is a parabola, and i'm confused on how you would find the vertex focus and directrix
24. math

how would you solve these equations? y^2+2y-2x+5=0 and (x^2/16)-(y+1)^2/(25)=1 thank you!

8368J
26. science

Whats a good reason for dissecting a heart and what would be the purpose?
27. chemistry

given 14g silver oxide, how much silver can be made?
28. stats

use technology to find the P-value for a two tailed test with n=28 and a test statistic t=2.032 P-value =???? Help please! i don't understand this
29. math

Thanks. So no matter what the times I have to subtract the starting time from the ending time - right?
30. math

if a game is started at 7:48am and finishes at 10:58am ... how do I figure how many hours and minutes it took to finish the game?
31. Statistics

A certian company enjoyed 3.5% profits in year 1 over its revenue in Year 0. In Year 2, it enjoyed 5.75% profits over Year 1. In Year 3, it posted 1.25% profits over Year 2. What single, constant profit over this period of years would have produced the same profit? The teacher...
32. physics

A particular guitar string is supposed to vibrate at 192 Hz, but it is measured to actually vibrate at 212 Hz. By what percent should the tension in the string be changed to get the frequency to the correct value?
33. Chemistry HELP!!

A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...
34. Chemistry

so then would i take: .284 L/44 g/mol =.006 then .006*100 g/mol =.645 then take .645/1.506 = .429 ---->.429 * 100 = 42.9% is this how i would get the answer?
35. Chemistry

a sample of limestone and other solid materials is heated and the limestone decomposes to give calcium oxide and carbon dioxide: CaCO3 ----> CaO + CO2 a 1.506 g sample of limestone containing material produces 284 mL of CO2 at STP. what is the mass percent os CaCO3 in the ...
36. Chemistry

A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...
37. Chemistry DrBob

I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work, thanks (A). A ...
38. Chemistry

(A). A reaction with a known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter. (B). When 1.00 g of C2H6(g) is burned in the bomb ...
39. chemistry

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.
40. chemistry

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.
41. math

what would be the length of a shadow cast by a 50 foot high building?

43. Algebra 1

How do you graph the function: y = 6x(squared) - 12x + 1 Then, how would you find the Axis of Symmetry and the Vertex? Any help is greatly appreciated
44. calculus

Please help. I need ( with details) how to differentiate with the chain rule f(x)=(x^2-6x+23)^3/2. I need to
45. Com155

So sorry. I am not good at english class that's why I am asking for help.
46. Com155

Sorry I wrote it wrong. The list is adjectives. I am having trouble finding the other adverb.
47. Com155

I think the adverbs are live, teenage, family, becoming, providing and world's. I cant figure out the other adjective.
48. Com155

Are they family and accidentally
49. Com155

Could you please help me locate the adjectives and adverbs in the below paragraph? ”Blending state of the art animation with live action, Hop is a comedy about E.B., the teenage son of the Easter Bunny. On the eve of taking over the family business, E.B. leaves for ...
50. 5 of 90 lotto equation formula

tomorrow Friday two sure

508 cm fly
52. MATH

A yard stick/ruler would probably be a good choice. Measuring tape perhaps.
53. Physics

A particle with a mass of 2.0×10−5 kg and a charge of +2.0 microC is released in a (parallel plate) uniform horizontal electric field of 13 N/C. If the plates are 5.6 cm on each side, how much charge is on each? (in pC) From what I have so far, the formula E=(4piKQ...
54. physics

I think you forgot to include the actual question part...
55. Physics

I whole-heartedly agree!
56. Physics

Two charges, -2.0 micro C and -6.0 micro C, are located at (-0.65 m, 0) and (0.65 m, 0), respectively. There is a point on the x-axis between the two charges where the electric field is zero. Find the location of the point where the electric field is zero.
57. chemistry

Name the following compounds (with absolute configurations) and are they enantiomers, diastereomers or structure isomers or no relation at all? img34.imageshack.us/i/namethese.jpg/ i think they are disteromers and their names are 1] 1S, 2S - (2-bromo - 3,4 - dimethyl pentane) ...
58. chemistry

Write down the reaction between 1-pentyne and 2 molar HBr should it be 2 br or 4 br? img718.imageshack.us/i/triple2.jpg/
59. chemistry

i posted this already but i got the answer for someone elses question. the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)...
60. chemistry

i posted this already but i got the answer for someone elses question. the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)...
61. Chemistry

the pka of acetone is CH3COCH3 is 19.3 which of these bases is strong enough to deprotonate acetone? a)KOH (pka of H20 = 15.7) b)Na+ -C(triplebond)CH (pka of C2H2 = 25) c)NaHCO3 (pka of H2CO3 = 6.4) d)NaOCH3 pka of CH3OH = 15.6) i know the answer is b but why is it b? is it ...
62. AP Chemistry

There is an unknown amount of unlabelled monoprotic acid in an unknown amount of water titrated with a sample with a solution of NaOH of unknown molarity. After adding 10.0 mL of NaOH, the pH=5.0. The equivalence point is 32.22 mL of NaOH. What is the Ka? I have been looking ...
63. calculus

Determine the values of a and b for the function f (x) = ax^3 + bx^2 + 3x - 2 given that f (2) = 10 and f ′(-1) = 14. Please help, Thanks!
64. SQL

Explain why the following command would create an error, and what changes could be made to fix the error. SELECT V_CODE, SUM(P_QOH) FROM PRODUCT;
65. chemistry

you're right! sorry i guess im just tired from over studying that i saw the wrong letter!
66. chemistry

Degree of unsaturation why is it 5? C20H32CIN do i ignore the second C? because i did 21(2)+2=44 44-32+1-1 / 2 = 6 but i get it right with 20(2)+2=42 42-32-1+1 / 2 = 5 do i always ignore extra C's?
67. french

please unscramble this word.. the word is eeienhtocasr

thanks
69. french

can you unscamble eeienhtocasr
70. math

two thirds of 9 is 6 and one third of 18 is 6 if you draw a gragh of 9 divide it into three sections.each section is a third,two of those sections equal two thirds which is 6.now a graph of 18 divided into 3 sections each section is 6.each section represents one third. 6 is ...
71. chemistry

Write the major products with the correct regiochemistry and stereochemistry for 1- ethylcyclohexene and the following reagents: a) NBS, H2O, DMSO if someone could atleast direct me to a site or anything that would be great.
72. Physics

In the figure below, two blocks are connected over a pulley. The mass of block A is 12 kg, and the coefficient of kinetic friction between A and the incline is 0.22. Angle θ is 30°. Block A slides down the incline at constant speed. What is the mass of block B?
73. calculus

Consider the graph of y2 = x(4 − x)2 (see figure). Find the volumes of the solids that are generated when the loop of this graph is revolved about each of the following
74. chemistry

Mechanism for the reaction between 3-methyl-2-pentene and HCl. is this right? %img836.imageshack.us/i/questionk%.jpg/% * delete the percentages for the link to work, its the only way i could post a link
75. chemistry

Write down the correct mechanism for the reaction between 3-methyl-2-pentene and HCL?
76. Econ

Consider the following consumption function. C = 200 + .75(DPI), Where C is consumption, autonomous spending is 200, the MPC is .75, and DPI is disposable personal income. Using the Graph below, graph the Consumption Function. C 100 0 = Income On the Graph, label the point ...
77. physics

jkjkjkjkjkjkjkjkjkjkjk
78. chemistry

thanks, but didn't really find the answer to my question...
79. chemistry

Im doing my lab report about steam distillation? and its asking me how i can tell if the two compounds i steam distilled are pure. but im not sure how to tell? i mean is the volatile or the nonvolatile compound the pure compound? or maybe the boiling point is what tells me if ...
80. chemistry

How can you tell if two compounds that you steam distilled are pure?

what are the atributes of tomorrow's leaders according to linda hill?

thanks alot!

ok Thanks.
84. Random Question

Does anyone know of any jobs hiring now???
85. Algebra 1

How do you solve this algebraic equation using graphing? y = 3x - 1 y = -x + 1
86. Magnetism

Great, thanks a lot!
87. Magnetism

This is a circular coil and indeed the open area is 227 cm No not perpendicular but parallel from the coil (measured 30 cm away from above the coil). My Gauss meter is not sensitive enough to pick up the signal at this distance. Can you somewhat elaborate more on the various ...
88. Magnetism

I need to calculate the magnetic field strength at 30 cm distance of a coil with a diameter of 17 cm. Directly at the coil surface I measure 100 Gauss. Please advise.
89. math

Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 6-inch side. A = sq. in.
90. Chemistry

How to know overall charge of molecule? see question # 12 here, why is it -1? how do you know? itech.pjc.edu/tgrow/2210/chm2210ps4sol.pdf
91. chemistry

Any easy way to remember the names and structures of functional groups? lol a lot to ask i know.?
92. math

Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 9-inch perimeter A = sq. in.
93. Physics

A toy car coasts uphill at 2.34 m/s. It accelerates at -.34 m/s squared. How long will it take the car to stop.What equation would I use.
94. CHEM

Ok, thank you.
95. CHEM

Are these cations, how do i know? BF3, BH3, AlCl3, FeCl3 how do i recognize a cation?
96. chemistry

can fractional distillation be used to determine purity of a compound?
97. chemistry

Calculate the formal charge on each non-hydrogen atom in eachof the following molecules (show your work) i know the answer but can someone tell me how to get to the answer? 1) H2C=N=N(2 dots on top and on side) 2. H2C-N(3 bonds)C(2dots)
98. chemistry

Calculate the formla charge on each non-hydrogen atom in eachof the following molecules (show your work)

hey
100. chemistry

okay, that helps a lot thanks!
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