# Posts by bobpursley

Total # Posts: 47,803

1. ### General Mathematics

No exponent needed: the value will be today's value + 10*100,000. Now if the rise in value is tied to the present value, then you need a exponent increase= 100,000/1,500,000= 0.0666 future value=1.5M(1+.06666)^10=2.85M
2. ### english

Comma (,) Use a comma after the first independent clause when you link two independent clauses with one of the following coordinating conjunctions: and, but, for, or, nor, so, yet. For example: I am going home, and I intend to stay there. D is ok on the second, but it is ...
3. ### physics

what is 700+100J ?
4. ### Physics

I of each: 1/3 ml^2 total Inertia: 4*1/3*(.040)*.25^2
5. ### Physics

x cm: (3*0+7.5*3+7*-3)/17.5 7 cm:(3*5+7.5*8+7*(-6))/17.5 distance to cm; sqrt( (xcm)^2+(ycm)^2 )
6. ### Physics

this makes no sense
7. ### Physics

do you not have a calculator? put each of these in your Google search window: 180/?= 180*7/22= 180/3.14=

yes
9. ### chemistry

oxidation reduction ? single replacement?

I am wondering what the quesrion acrually is. Connect the points. determine the area under the connected points. https://www.dummies.com/education/math/calculus/how-to-approximate-area-with-the-trapezoid-rule/
11. ### Astronomy

https://www.jiskha.com/display.cgi?id=1531596697
12. ### Astronomy

wave equation: freqency*wavelength=speedodlight freq=3e8/1160e3 energy=Planck'sConstant*frequency

14. ### Physics

https://www.jiskha.com/display.cgi?id=1282673499
15. ### Math

each term is 2/3 of the precious term 27+18+12+8+16/3 + 32/9+ ...
16. ### Chemistry

twice as fast? 2x. so what is the molmass of CH4 x (2)^2 ?
17. ### Chemistry

1. number of calories in 10 grams of sugar. Intensive, same for any 10 gram sample 2. Percentage of alcohol in a beer. Intensive 3. Electrical resistance of 1km length of 22 gauge copper wire > same as 1. 4. Electrical resistance of 22 gauge copper wire. extensice, depends...
18. ### MATH - circles, circles, circles

https://math.stackexchange.com/questions/1241472/the-greatest-number-of-points-of-intersection-of-n-circles-and-m-straight-lines Is a similar question, and most interesting graphics
19. ### physics

H(finalTime)=0=39.2t -4.9t2 + 58.8 solve that quadratic.
20. ### Can someone help with this Econ problem?

B is correct. The Fed constantly buys and sells U.S. government securities in the financial markets, which in turn influences the level of reserves in the banking system. These decisions also affect the volume and the price of credit (interest rates). The term open market ...
21. ### chemistry

so one liter has a mass of 1380 grams, and of that .56*1380 is the mass of the sulfuric acid. Moles of acid in one liter then is .56*1389/98 moles Molarity= molesacid/1

23. ### Physics

freq= k/length freq*length=k 256*80cm=f*15dm f=256*80/15 hz

It depends on you. No one is given a job for taking a course of study. Jobs may have needs for particular experience or knowledge, but just having that is not enough. My guess is that you need to look at finding jobs available to you that interest you.
25. ### 7 math

Your question makes no sense. Please go back and type it exactly as it was given to you.
26. ### physics

power= m g h/time can you compare them?
27. ### physics

What is 1/2 k *.03^2 Joules?
28. ### Kevin, Ni, Niles

so used Dalton's Law. I will be happy to critique your thinking. It does no good to post a series of test questions using different names, none of which indicate any work on your part.
29. ### chemistry

So the product must be of the form PtCln, and the question is what is n, the ratio of the chloride to platinum. Moles of Pt: .509/atomicmassPt =.509/198=.00257 moles of Cl: (.889-.509)/atomicmassCl=.38/35.45=.0107 dividing each by the lowest, to get the ratio Cl: .107/.00257=4...

Goodness no.
31. ### world history

The consequences for the Ottoman leaders responsible: No trials were ever had.

33. ### Algebra

take a look at this, letting a=5, b=3 http://www.wolframalpha.com/input/?i=y+%3D+3*5%5Ex so when x= large negative number, then slope goes to ....
34. ### Philosophy

Read this: Heraclitus thinks you are stupid if you don't agree.... https://plato.stanford.edu/entries/heraclitus/
35. ### algebra

IT hurts it is so wrong. Memorize this formula amount=Initialamount(1+i)^t where i is DECIMAL (.O3 here), t is the years elapsed.
36. ### science

Multiply by change in Temp. * means times. I get near 100 Joules
37. ### science

heat=mass*specific heat capacity*changeintem changeintemp=90C specificheatcapacitygold=0.129 J/gC but one Joule=0.239 calorie , so specificheat capacity gold= = 0.0308 cal/gC mass=36g do the math.
38. ### Substitution

x^2 - y +2 = 0 4x = 14 -y y=14-4x x^2-(14-4x) +2=0 x^2+4x-12=0 (x+6)(x-2)=0 x=6; x=2, y=-10;6
39. ### Physics

horizontal path? acceleration=v^2/r=20^2/.05 force= mass*acceleration
40. ### Physics

force, area, and strain (changelength/length)
41. ### Physics

force=kx energy=1/2 k x^2=1/2 * k (force/k)^2==1/2 * 75^2/1500 joules one answer is good to two sig digits.
42. ### Chemistry

The concentration is .010g/ml=10g/l=10/267.24 M=.0374M so you want to dilute it .0374M/10e-6M... = 3750 times that means one part original, and 3749 parts water. so in 10 ml, one part=.01/3740=2.67e-6 liters or 2.67e-3 ml of stock, add solvent (water?) to 10 ml
43. ### Algebra

What is -90/3 ft/min ? average anything= total change/total time
44. ### Maths ch1 real n

You're kidding right? We have no idea what your book is, nor what you are confused on. If you want help, post a question with your thinking.
45. ### Chemistry

Here is step by step for nearly all these prolbems. Go thru the rest, and we can critique for you. a. Write the balancee equation: PCl5 <<>> PCl3 + Cl2 b. Write the equilibrium expression: k= [PCl5][Cl2]/[PCl5] because moles/volume=concentration, and volume is 2 ...
46. ### Math

6*4.92 ml extract=29.5 teaspoons total suspension=240+29.5=270 concentration=29.5/270= 0.109 or 11parts per hundred
47. ### Math

http://www.wolframalpha.com/input/?i=y%3D+-x%5E5+%2B+11x%5E4+-+43x%5E3+%2B+69x%5E2+-+36x Note in the alternate forms of the equation, the (x-3)^2 factor which indicates a double root.
48. ### Math Homework Help!

C(x) = 5log(x+1)+10 D(x)=5log(x+1)+10 These are the same function!
49. ### chemistry

Grahams law: Molemass H2=2 10/37.4=sqrt(2/G) square both sides, solve for Molmass G G=(37.4/10)^2 /2
50. ### English

post your attempt, and in fact, indeed we will critique your work
51. ### geometry

<< If someone got give the answers to the one's below, it would be greatly appreciated.>> We don't do that.
52. ### Math Algebra

2x^4 - 5x^2 - 12 = 0 x^4 - 5/2 *x^2 - 6 = 0 x^4 - 5/2 *x^2 = 6 take half of the center term, and square it. x^4 - 5/2 *x^2 +(5/4)^2= 6 +(5/4)^2= 7.5625 (x^2-5/4)^2=7.5625 (x^2-1.25)^2= 7.5625
53. ### Physics

https://en.wikipedia.org/wiki/Relativity_of_simultaneity
54. ### math

sketch it. you know in the triangle angle P, and angle Q just from the bearings. I get P=210-150 Q=60 (QR is due East) so you have two (three if you consider the entire triangle), one opposite side. Law of sines is useful at this point
55. ### English

I have forgotten all this grammar. Had you not forgotten, you would not be asking.
56. ### Science

six hours is four halflives. .1=(1/2)^4 * original=original/16 solve for original
57. ### negative numbers 6th grade

take the first part: (-16/5 / 8/15)=-16/5 * 15/8=-2/3 now divide again -(2/3)/(9*9/8)=-(2/3)/(-81/8)=2*8/3*81=16/243 If I understood your problem correctly.
58. ### physics

is the track vertical or horizontal?
59. ### Physics

The one that accurately describes a proper use of eyeglasses is : using diverging lenses to help a nearsighted person by moving the image from in front of the retina to the retina The lenses will diverge the light before it reach the eye and aim it to the retina, correcting ...
60. ### Chemistry

Didn't I just do this? Please don't post duplicates.
61. ### Chemistry

assuming a quart is one liter, so you have .83 moles of acid in the vinegar. CaCO3 + 2CH3COOH>>CO2 + H2O + C4H6O4Ca Calcium Acetate so it takes one mole of calcium carbonate to neutralize 2 moles of acid. You have .83 moles acid, so you need 0.415 moles, or .415*100 ...
62. ### Chemistry

Molarity=moles/liters .1mole=5.8grams NaCl in a liter so volume= 1liter*5/5.8
63. ### Mimi

post your thinking, or what is confusing to you on your chem/physics questions. I am not much of an answer giver. I do critique well.

67. ### Chemistry

C2H4+3O2>>2CO2 +2 H2O want 400ml? 100,300 will do it. Think out why.
68. ### Chemistry

https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/Reaction_Rates/Second-Order_Reactions So if the half-life is given by Thalf=1/(k(AB))=1/.0169=59.2 min=5.32 halflives ...
69. ### Chemistry

2KClO3 >> 2KCl +3O2 so one gets three moles of O2 for each two moles of the chlorate. moles of O2=48/32=1.5 so we multiply that by the mole ratio: 1.5*2/3 to get the moles of the chlorate; but it is not pure, so moles of impure chorate= 1/.75 * 1.5*2/3=4*3*2/3*3*4= 1....
70. ### grammar

IT (an singular object) needs. He needs. Mom needs. The window needs washing. They (Plural things) need. The cars need washing. .Those windows need washing
71. ### fine art

It seems to me the second one is asking for you to pull out a crystal ball and project where art is going based on current trends: Graphics? Art disbursed in public areas such as streets, parks, etc? Art disbursed by public computer networks?

73. ### Pharmacy calculations

you gave the amounts per 1000ml So multiply each by 1/4 .
74. ### Chemistry

thanks Scott.
75. ### Chemistry

one metric ton=1000kg=6.66e4 cans (divide 1000kg by .015kg)
76. ### Physical Chemistry

Make certain you understand wavenumber vs wavelength. It does not change the ratio obtained in the above (just inverse).
77. ### Physical Chemistry

740747 cm-1, 877924 cm-1, 925933 The shortest wavlength should express a transition from level 2 to level1 1/lambda=C(1/n2^2-1/n1^2) Where C is some constant. for n2=2, n1=1 then 1/lambda1=C(3/4) or C=4/(3*lambda1) lets look at the next transition: 1/lambda2=C(1/9-1/1) or C=9...
78. ### Economics

Mean*total=49.46*100+52.32*200=15410 and total is 300 mean=51.37
79. ### science

and the question?
80. ### physics

distance=sqrt(8^2+4^2) displacement...you will have to measure the angle relative to PQ.
81. ### Basic science

g is not 10m/s^2 anywhere on Earth. Frankly, I like to call g not the acceleration due to gravity, but the Gravity Field Gravity Field= 9.8Newtons/kilogram or 9.8N/kg PE=massinKg*GravityField*height=.04kg*9.8N/kg*2.5m=... remember that a N-m is a joule, by definition.
82. ### physics

work=energy in spring=1/2 k x^2 k=displacementinMeters/forceinNewtons
83. ### Algebra

n integer (pronounced IN-tuh-jer) is a whole number (not a fractional number) that can be positive, negative, or zero. Examples of integers are: -5, 1, 5, 8, 97, and 3,043 So the "smallest", whatever you mean by that.... -1 is the greatest negative integer, 1 is the ...
84. ### CHEM?

Absorbance = 2 – log(%T=2-log(3.45e1)=2- 1.5378191= 0.4621809
85. ### chemistry

conc of OH=.5 moles/liter p(h)=14-p(OH)=14-log(.5)=13.7
86. ### Chemistry

moles Silver=54/107.9=.5 moles electrons in .5 moles=.5*avagnumber. current*time=totalcharge=.5*avagnumber*chargeperelectron time= .5*avanumber*1.6e-19/1.5 seconds
87. ### chemistry

what is 760-34 mmHg. Pressure(O2)+pressure (H2O)=760mmHg
88. ### physic

power=work/time=500/4 watts
89. ### physics

As I read your question, the wedge is moving such that it cancels the downward graviith force on the block. Downward force on block due to gravity=mg*sinTheta upward force along the plane due to wedge moving=ma*cosTheta set them equal ma*cosTheta=mg*sinTheta a=g*tanTheta ...

91. ### Physics

Conservation of Momentum mv=(M+m)V' solve for V' KE after impact = 1/2 (m+M)V'^2 energy lost:1/2 mv^2-1/2 (M+m)V'^2

93. ### phy 220

see this previous response for a slightly different error. https://www.jiskha.com/display.cgi?id=1510151111

95. ### math

https://dataprivacylab.org/courses/popd/lab2/ExcelLine.pdf
96. ### Maths

obe...I was thinking about the STar Wars movie, making no connection for me. Thanks.
97. ### Maths

and what is obe lap of the field mean?
98. ### Chemistry

determine the moles of each. then, add the atomic number of the elements; eg, CH4=6+1*4=10. That will be the number of electrons per molecule. Numberelectrons=moles*AvagNumber*electronsPerMolecule
99. ### Geography

It is a little more complicated than that. https://www.worldtimezone.com/
100. ### Chemistry

Memorize the molar volume of any gas: 22.4 liters at STP 2 moles? 2*22.4 Liters
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