# Posts by Tim

Total # Posts: 1,511

Physics
Suppose a hypothetical radioactive nucleus (Hy) has a half-life of 10 days. If we have 80 gms of the substance at the start of an experiment, how many gms of the substance will remain undecayed after 30 days

Algebra
Can someone tell me if I am right? I need to find the equation of a parabola. I am not sure if this is the correct way or if I have the correct answer. Vertex at origin, focus is at (0,3) Equation of parabola vertex (0,0) focus (0,3) focus (h,k+p) (0,0+3) y=0-3 directrix y=-3 ...

algebra problem
I need to find the equation of a parabola. I am not sure if this is the correct way or if I have the correct answer. Vertex at origin, focus is at (0,3) Equation of parabola vertex (0,0) focus (0,3) focus (h,k+p) (0,0+3) y=0-3 directrix y=-3 a=(1/4)(p) a=(1/4(-3))=(-1/12) a=(-...

Physics
In a diesel engine, the piston compresses air at 302 K to a volume that is 0.0628 of the original volume and a pressure that is 48.2 times the original pressure. What is the temperature of the air after the compression? I have no idea can anyone help?

geometry
or you could just notice that the numbers are just double and double 6 to=12

physics
ok I used the Ideal gas fromula by saying (48.2)(.0628)/1.38*10^-23)(302K) I got a number N but it does seem to be correct and how would I use N to find the temp. of the air after compression?

physics
In a diesel engine, the piston compresses air at 302 K to a volume that is 0.0628 of the original volume and a pressure that is 48.2 times the original pressure. What is the temperature of the air after the compression? Ok I know I have the temputure of the engine but how do i...

English
Can someone please give me basic instructions on how to write a 10% summary please.

physics
Information: 1. According to the information on the EERE posting, 22% of the U.S. annual electrical energy consumption is for lighting. The amount of energy is 8.2 Quads, (1.0 Quad = 1015 BTU). This is in agreement with the information given in the International Energy Agency...

Algebra
Below is my problem with my answers. I don't think this is that tough, but I cannot believe that my ABC answer's are a fraction. Did I do this correctly? Find the unknowns on the right side of the partial fraction. (x+3)/(x^3+64)=(A)/(x+4)+(Bx+C)/(x^2-4x+16) x=0 A= (-x...

Math
Can someone check my work and see if I did this correctly? Problem: 9^(x+6)=3^x ln9^(x+6)=ln3^x (x+6)*ln(9)=x*ln(3) (x+6)/x=ln(3)/ln(9) x/x+6/x=0.49999977 1+6/x=0.49999977 6/x=0.49999977-1 6/x=(-0.5000002) x=6/(-0.5000002) x=(-11.9999952) is this correct?

Biology

Biology
A cell with replicated chromosomes. Pick haploid, diploid, or none. Explain why you chose the one you did. My answer:(I am not sure if this is complete enough?) I think it is a diploid, because diploids are copies of each chromosome. A chromosome pair (sperm & egg) is a ...

Physics
A 10 kg block of ice has a temperature of -13°C. The pressure is one atmosphere. The block absorbs 4.10 106 J of heat. What is the final temperature of the liquid water?

Science
I need to know the "type of visible light?" Is it sunlight?

Science
Can someone tell me what they want when they say "type of visible light"? The plants were in a window and received the morning sun. Question: What type of visible light is made available to for plants grown under the clear, red, or blue plastic?

Algebra
Does anyone know the significance of the rational zero test? Is it the rational root test? I can find the rational root test, but I don't know where I can find the reason for the rational zero test. Any clue?

Algebra
Consider the function h as defined. Find functions f and g so that (f o g)(x)=h(x) h(x)=5/x^2+6

Algebra
h(x)=5/x^2+6 I know the answer is: f(x)=x+6, g(x)=5/x^2, but I do not know how to get it. Can someone help me understand it?

Math
Is the following function symmetric with respect to the y-axis, symmetric with respect to the x-axis, symmetric with respect to the origin, or none of the above? f(x)=-5x^3+2x I think it is: -3+1=2 This function is symmetric to the y-axis.

physics
if it costs 4.5 to 7.5 cents per kilowatt-hour (wind energy) what is the price per kW?

Social Studies
I was asked to submit an analysis of my understanding of my own cultural heritage. What questions should I be answering in this paper?

Algebra HELP!
Solve the equation identify as an identity, an inconsistent equation or a conditional. My equation is 1-3/2x+7/4 I know the answer is Conditional {-2}, but I cannot figure out how to get it or even where to start.

Physics

Physics
Compare two transmission lines: one at twice the voltage of the second. Which of the two lines is most advantageous to a utility company? How much is the advantage?

Algebra
Solve the equation identify as an identity, an inconsistent equation or a conditional. My equation is 1-3/2x+7/4 I know the answer is Conditional {-2}, but I cannot figure out how to get it or even where to start.

Algebra
My equation is 1-3/2x+7/4

Algebra
Solve the equation identify as an identity, an inconsistent equation or a conditional I know the answer is Conditional {-2}, but I cannot figure out how to get it or even where to start.

Algebra
compound inequality write the solution set using interval notation and graph -7x+1>=15 or 5x+3>=-17 -1 -1 -3 -3 -7x/-7>=14/-7 5x/5>=-20/5 x>=-2 x>=-4 {-2,sideways8) {-4,sideways8) On my graph I have a { at -2 Does someone know how to do this?

My problem is: 4 sqrt 81 I know the answer is 3, but I do not know how they got it.

Algebra
20x^2-12x+15x-9 20x^2-12x+15x-9 = 20x^2+3x-9 = (4x+3)(5x-3)

Algebra
Sorry, I put and = when it should have been a +! Is the one below right? 20x^2-12x+15x-9 20x^2-12x+15x-9 = 20x^2+3x-9 = (4x+3)(5x-3)

Algebra
So my second line should be: 20x^2-27x+9=0

Algebra
Can someone tell me if I am right? Factor by group 20x^2-12x=15x-9 20x^2+3x+9 (4x+3)(5x-3) answer

Physics
(dwrls) If it is \$ .20 \$/kWh x 10kWh = Would it cost \$2.00 per hour?

Physics
If it is \$ .20 \$/kWh x 10kWh = Would it cost \$2.00 per hour?

Physics
.2 X 10 = \$2.00?

Physics
Assume the utility rate to be \$.20/kWh. What is the cost of purchasing 10kW for 1.0 hour?

physics
I'm supposed to design a PV system that could provide an average electric power of 10kW. The average power generation of a solar panel is 20% of the peak power generation. Determine Peak power.

algebra
ok, my last question got cut out..here is a link tothe word doc. I cant post an adress cus the site wont let me....go to rapidshare then just paste /files/98328813/Can_u_plz_help_with_these_two_questions.doc and put .html at the end.

algebra
thanks for the help, i appreciate it, i was unsure of where iwas going wrong, it was just my brackets i mucked up, thanx.

algebra
thanx, actually the site cut off my question, what i tried to type was 2^n x 4^(n+1) / 8^(n-2)

algebra
hey i need some help with a couple of questions please..... change all bases to 2 then simplify fully 2^n x 4^n+1 8^n-2 (note that i cannot put the division line thingo in) prove that: a^m/n = n(outside radical sign)a^m (inside radical sign) i don't know if you can ...

chem
What volume of carbon dioxide is produced at 0 degrees C and 1 atm when 1.6 L of oxygen is used to burn acetylene(C2H2)?

chemistry
So if I understand you correctly the numbers I would need to use are the ones found at the end point or the titration equivalence point. My equation would then be: 0.015000M of NaOH x 0.01505L/0.01505L

chemistry
I am confused on how to do the last question. Calculate molarity of HCl from the volumes of acid and base at the equivalence point and the molarity of NaOH from the titration curve. (M of Acid)x(v of acid)= (m of base)x(v of added base) M1= 0.50M of NaOH x 0.050L/0.01505L M1= ...

Math
PAULA ,SIMON AND RANDY COLLECTED INSECTS FOR THEIR SCIENCE PROJECT. AT THE END OF THE FIRST WEEK PAULA AND RANDY TOGETHER HAD 89 INSECTS, RANDY AND SIMON TOGETHER HAD 80 INSECTS, PAULA AND SIMON HAD TOGETHER HAD 85. HOW MANY DID EACH HAVE ALONE?

Math
RANDY AND SIMON TOGETHER HAD 80

Math
PAULA ,SIMON AND RANDY COLLECTED INSECTS FOR THEIR SCIENCE PROJECT. AT THE END OF THE FIRST WEEK PAULA AND RANDY TOGETHER HAD 89 INSECTS, RANDY AND SIMON TOGETHER HAD 85 INSECTS. HOW MANY DID EACH HAVE ALONE?

arithmetic
7 LITTLE CATS x 4 LEGS = 28 28 X 7 = 196 LITTLE CATS LEGS 7 BIG CATS X 4 LEGS = 28 7 GIRLS X 2 LEGS = 14 BUS DRIVER HAS 2 LEGS 196 + 28 + 14 + 2 = 240

Chemistry
alpha -hydroxylbutyric acid (CH3CH2CH(OH)COOH) is this correct?

Chemistry
Does anyone know what CH3CH2CH(OH)COOH or C4H9O(C=O)CH3 is?

Math
176 is the mean 183 is the median. Not sure If the mean or median is more useful representative of the final examination scores

Math
Hi Guido, For your information I am Tim. Not a Babygirl

Math
The following scores were recorded on a 200-point final examination:193,185,163,186,192,135,158,174,188,172,168,183,195,165,183. Find the final examination score. Find the median final examination score. Is the mean or median a more useful representative of the final ...

Chemistry
HELP! I am struggling on this question. I think I may or may not have it. Why does Methane has a tetrahedral shape? The Valence-shell electon pair repulsion theory applies which predicts that the shape of a molecule by placing the electron pairs on a central atom as far apart ...

Chemistry
Can someone tell me if I have this correct, I am leaving something out, or if I need to start over. I am alittle confused about the balanced equation involving a reaction. Write a balanced equation for the reaction of MG with HCI. Mg+HCL---MgCl2=H2 Mg-1 Mg-1 H-1 H-1 Cl-1 Cl-2 ...

economics
how to calculate the cpi for a given market basket, with given year and prices?

Economics
what does the inflation formula shows?

Economics
What is the formula for CPI consumer price index? and how it is use to calculate prices?

chemistry
The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 400C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is...

chemistry
Would it be n2a/V2?

lit
For my existentialism project(I have to create a work of art that reflects the absurdity of our meaningless universe, or our reaction to it (pick from the six existentialism themes), I drew the three people fighting, trying to go through a doorway (there is nothing behind the ...

lit
Thank you so much GuruBlue for wonderful suggestion. However, I have to depict one of these existential themes: Man is conscious subject, Anxiety, Absurdity, Nothingness, Death, and Alienation.

lit
I have to create a work of art that reflects the absurdity of our meaningless universe, or our reaction to it (pick from the six existentialism themes) I was thinking of doing death absurdity. I was going to draw a picture of someone working hard to become a doctor his or her ...

math
You should slide your decimal over 2 places so that you get 95.9%

Math
the sum of 1 over 6 2 over 3 and 1 over 4. is 13 over 12 right

When you divided 340/70 and came up with 4.857, how'd you come up with 8?

Yea the answer in the back of the book has it at 9 p.m. ,and yea they do ask for the time when their 340 kilometers apart, interesting, could the book be wrong?lol

At 3 p.m., Brunhilde headed north at 30 kilometers per hour. Two hours later Ludwig headed south at 40 kilometers per hour. At what time will they be 340 kilometers apart? I know that the distance from Brunhilde(Db) plus the distance from Ludwig(Dl) is equal to 340, which is ...

describe the following sets in words: B u C A u B A n C A u(B n C)

philosophy
What fallacies, if any, are present in the following passage? Can you please give reasons for your answer, that is, if you say that a fallacy has been committed, then show where the fallacy occurred, and explain why you think it is a fallacy? Background: In this passage, ...

philosophy
What fallacies, if any, are present in the following passage? Can you please give reasons for your answer, that is, if you say that a fallacy has been committed, then show where the fallacy occurred, and explain why you think it is a fallacy? The passage: Canadian military men...

philosophy
Can someone please take a look at my question and provide some feedback? Thanks The question: What fallacies, if any, are present in the following passage? Give reasons for your answer, that is, if you say that a fallacy has been committed, then show where the fallacy occurred...

AP Physics
Two 10 kilogram boxes are connected by a massless frictionless pulley. The boxes remain st rest with the one on the right hanging vertically and the one on the left 2.0 meters from the bottom of an inclined plane that makes an angle of 60 degrees with the horizontal. The ...

chemistry

math
i don't understand this question. 2+(9*9)= ?

Physics
1. The problem statement, all variables and given/known data A student pulls on a box up an incline of 10 degrees. The student pulls with a force of 180 N directed at 30 degrees above the line of the incline. The box has a mass of 28 kg, and the coefficient of friction between...

Math
Thanks

Math
How do you figure percentages? Question: If a factory worker is supposed to produce 1000 units an hour but only produces 568 units, what percentage did the worker produce? How do you figure this?

Physics

Physics
If a vector that is 1 cm long represents a velocity of 10 km/h, what velocity does a vectory 2 cm long drawn to the same scale represent?

math
Next 3 in pattern 2/19, 27/76, 46/76, 65/76

do you feel tariffs helps us to maintain a favorable balance of trade and balance payments?

Geometry
Please Help! How do I work this? The Volume of the box is represented by (x^2+5x+6)(x+5). Find the polynomial that represents the area of the bottom of the box.

Geometry
Please Help! How do I work this? The Volume of the box is represented by (x^2+5+6)(x+5). Find the polynomial that represents the area of the bottom of the box.

Algebra
Thanks, that is what I did but I was not sure about it.

Algebra
How would I work this problem? x^2=-6x

Biology
Explain how the lacfk of genetic diversity found in populations of endangered species might hinder their recovery Genetic diversity is needed to cope with environmental changes. With genetic diversity, if there are large changes in the environment, at least some individuals ...

Biology
To ensure that the mother will have mature egg cells svailable for in vitro fertilizstion she must be treated with chemicals that regulate her reproductive cycle, Explain what these chemicals thst regulat both the female snd msle reproductive cycles are called I searched ...

Maths
How would I find the vertex of the parabola y = x^2 – 2x + 4 ?? could some one explain the method to me ?

Algebra
Could someone correct my answers and help with the other problems? 1. Are the following lines parallel, perpendicular, or neither? L1 with equation x – 5y = 10, L2 with equation 5x + y = 5. Answer: Neither (I'm not to sure but i think this is the right answer) 2. ...

Macroeconomics
If there is a reduction in output, how will that affect money demand? do some research, then take a shot. Hint: what are the factors that produce a demand for money?

Math
What property is illustrated by the equation -8+0=-8? a) distributive b) additive inverse c) communitative d) additive identity additive identity is what?

What is the impact of electronic commerce on the entire United States legal system? Describe the impact of e-commerce on the global legal environment That sounds like a major research paper -- or maybe several books. What have you found from your research? How do you think ...

finance
Subordinated debt has less default risk than senior debt

English
What does the title of a streetcar name desire Have you read the play? Stella: But there are things that happen, between a man and a woman, in the dark, that sorta make everything else seem unimportant Blanche: What you are talking about is brutal desire. Just desire. The name...

Matter
Ashely creats a clay of bowl that ways 1.01 lb. Which is the weight of the clay used to create the bowl?

math
how do you the equation of a line in a coordinate plane? Hello Tim, if I understand your question right, the equation of a line is: y = m*x + c Hope this helps.

spelling
grass: lawn: toss: throw

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