# Posts by Erin

Total # Posts: 696

physics
During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 4.3 108 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the ...

Calculus
Find the number c that satisfies the conclusion of the Mean Value Theorem. f(x) = x/(x + 4) [1, 8]

Chemistry

Chemistry
An alpha particle (mass 6.6 x 10^-24 grams) emitted by radium travels at 3.4 x 10^7 plus or minus 0.1 x 10^7 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) Whats uncertainty in its position? for part (a) I got 1.53 meters which said it was wrong on Aris and I got...

Math
How would I write this out? The high temp for a day is 6 degrees C. The mean temp for the day, which is the mean of the high and low temps, is -4 degrees C. What is the low temp for the day? Thank you.

physics
tanTheta = h/b => b=h/tanTheta =>b= 34ft/tan(17) =>b= 111.2ft 111.2ft

Calculus
Find the derivative of y=xsin(2/x)? On web-assign everything that I have tried has been wrong.

Physics
When an air capacitor with a capacitance of 300 nF (1 {\rm nF} = 10^{-9}\;{\rm F}) is connected to a power supply, the energy stored in the capacitor is 1.95×10−5 J. While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that ...

english
what is needed to combine two sentences with a comma

geometry
how do you find the height of an isosceles triangle only knowing the lengths of all three bases? EX: There's isosceles triangle ABC with vertex angle B. AB= 5x-28. BC= 2x+11. AC= x+5

geometry
In geometry, can a counterexample be used to determine if a conjecture is false or not?

Physics - fluids
A solid cylinder (radius = 0.170 m, height = 0.150 m) has a mass of 7.00 kg. This cylinder is floating in water. Then oil (ñ = 0.866 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the cylinder is in the ...

geography
I can't find any of the answers in the book, could you please help? 1. The landform occupying the center of the triangle that forms the indian subcontinent is the.. A Deccan Plateau B Western Ghats C Indo- Cangetic Plain D Eastern Ghats 2. Which account of an Azerbaijani ...

Algebra
I'm not sure how to factor 3x^3-12x^2+3x. I tried separatring the 3x so that 3x(x+1)(x-4, but I got -3x^3+-12x^2-3x^2+12x. Can you show me where I went wrong and how to properly factor this? Is there a general rule or tip for this sort of factoring with a number to the ...

Algebra
Is a function with a fraction (1/4) an even or an odd function? Or can fractions be neither even or odd? I have to declare one or the other, so I'm not sure what to say.

Algebra
I have to find the standard form of a quadratic function with the vertex of -1,4 and x intercepts of -3,0 and 1,0. What do I do when I have two x intercepts like this?

Math for educators
I was wondering what sort of teacher you are studying to be. I can't help you with this, but I was curious as to what subject area you are trying to get your certification in.

Algebra
How come there are no x intercepts for x^2-x+(5/4)? Can you show me why, please?

Algebra
When using -b/2a with functions, should I ignore the negative, figure out b/2a and then put a negative around it? Or should I turn 2a into -2a? Or should I go -b/-2(-a)? Thanks for clearing this up!!!

Algebra
It's just the number of the problem.

Algebra
27-f(x)=1/4x^2-2x-12. Can you show me how to find the vertex and x intercepts, step-by-step? I tried to put it in standard form, with (1/2x-1)^2-13, but my book said that's not the answer. Thanks!

Algebra
Where did the 1 come from in the standard form come from? How did the 5/4 become 1 when it was transferred to outside of the parentheses?

Algebra
I have to find the vertex, axis of symmetry, and x intercepts of x^2-x+(5/4). I put it in standard form as -(x+-.5)^2+1.5. Thus, the vertex would be .5, 1.5. But the book's answer is 1/2, 1. How did they get this?

Algebra
17-Identify the vertex, axis of symmetry and x-intercept(s) of F(x)=(x+5)^2-6. I have no idea how the x intercepts are -5 +/- sq. root 6 and 0. can you show me how this came to be? I factored it so it would be x^2+10x+19, but there's no common factors in ten and 19. Can ...

History
I tried googling this, but I couldn't find it. What is the name of the journalist (who was either British or American...I can't remember) who snuck into Saudi Arabia in the early twentieth century and disguised himself as a Muslim since no non-Muslims were allowed in ...

Geometry
If a/4=b/7, then a/b=?

Its Oh Lay

Chem - Stoichiometry
How many grams of sodium carbonate is required for a complete reaction with 1.00g of calcium chloride dihydrate? Help!

Chem - Stoichiometry
How many grams of sodium carbonate is required for a complete reaction with 1.00g of calcium chloride dihydrate? Help!

UNE
I know...I realized that right after I accidentally posted - that is why there is the CORRECT post and subject right after this one called Stoichiometry. THANKS FOR THE HEADS UP, THOUGH.

UNE
How many grams of sodium carbonate is required to have a complete reaction with 1.00g of calcium chloride dihydrate? I can't figure this out...help!

Physics
1.66 m/s^2! Thanks

Physics
Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 1.75 s and the second in 1.17 s. Find the constant acceleration of the train. I know how to find average ...

Physics
A motorist travels at a constant speed of 34.0 m/s through a school zone; exceeding the posted speed limit. A policeman, waits 7.0 s before giving chase at an acceleration of 3.9 m/s2. (a) Find the time required to catch the car, from the instant the car passes the policeman...

biology
it is everything that occupies a place in the space

Social Studies
how did geography affect the development of African kingdomes?

Physics
5.03 m/s^2

Physics
14.84 m/s^2

biology
mitochondria-hydraulic dam ribosomes-small shops nucleus-town hall endoplasmic reticulum-special carts golgi apparatus- post office protein-widget cell membrane-fence lysosomes-scrap yard nucleolus-carpenter's union

Math- calculus
Given f(x) = x ^ 3 - x ^ 2 -4x +4 Find the zeros of f. Write an equation of the line tangent to the graph of f at x = -1 The point (a,b) is on the graph of f and the line tangent to the graph at (a,b) passes through the point (0,-8) which is not of the graph of f. Find a and b...

college physics
Two small spheres, each with mass m=3g and charge q, are suspended from a point by threads of length L=0.22m. What is the charge on each sphere if the threads make an angle theta of 15 degrees with the vertical?

college physics
There are four charges, each with a magnitude of 2.0uC. Two are postive and two are negative. The charges are fixed to the corners of a 3.0m square, one to each corner, in such a way that the net force on any charge is directed toward the center of the square. Find the ...

college physics
Two small spheres, each with mass m=3g and charge q, are suspended from a point by threads of length L=0.22m. What is the charge on each sphere if the threads make an angle theta of 15 degrees with the vertical?

Math
Guess my rule? Write a funtion for the function. Input 6 7 8 9 Output 5 5.5 6 6.5

Global
Explain how the African European and the Native American cultures blended to form a latin american culture?

English
I am having trouble writing a topical outline and expanding it to a sentence for this paper: Marie Curie is best known as the discoverer of the radioactive elements polonium and radium, and is the first person to earn the honor of two Nobel prizes. Her work not only influenced...

Math
Thank you Ms. Sue!

Math
Your not dividing IN half, but BY half. I did it the way of using fractions. Because half is .5 or 1/2. I have no idea how he got 12 either!

Math
Divide 30 by half and add 10. What do you get? I think it is 70, but my friend disagrees. He thinks it's 12.

math
But how did you figure it out like that.

math
There is a circle that is cut in three slices one slice is (in fractions) 1/3 and one slice is 1/5. What fraction is the other slice. (it is a whole circle.) Can you please tell me how to I can figure this out on my own.

Pre Algebra
(h4) 4 (-6x7) (-9x12) the answer is -63x 19

Jake was new to Fair Ridge Elementary, and he was big. Jake bullied Tommy when his jeans jacket was too small for him. It stretched tight across his back and the sleeves were too short for his arms. And, Jake is taking his things from the other students. But now Jake and Tommy...

Secret Pal Surprises Characters and Setting? It is for my book report. Please tell me the characters (behavioral description) and where's the setting.

Eng 102
How can I support my thesis with compelling arguments and counterarguments? Here is my thesis statement? Although many coal industries argue that mountaintop removal coal mining is more cost effective than underground coal mining, MTR is destroying the beautiful mountains and ...

Algebra
y3-2y2- + 3y-4 for y+5 (-9) (-9) (-9) m.m.m 7.a.a.b.b.b

y3-2y2- + 3y-4 for y+5

I need help with exponents -n6 for n=2

9th Pre Algebra
I need help with exponents -n6 for n=2

How many hours 150 minutes for reading log? for times with reading log

math
thank you!

math
You must be at least 48 inches tall to ride an amusement park ride, and your little sister is 30 inches tall. How many inches/must she grow before she may ride the ride? You need no more than 3,000 calories in a day. You consumed 840 calories at breakfast and 1,150 calories at...

Wilders Preparatory
What are the modifiers for the word flexible?

biology repost
Predict what would happen to a red blood cell placed in each of the following external solutions. Would it shrink, swell, or not change its volume? Explain each answer in ONE sentence. a. 150 mM NaCl b. 100 mM NaCl plus 50 mM albumin

biology
Predict what would happen to a red blood cell placed in each of the following external solutions. Would it shrink, swell, or not change its volume? Explain each answer in ONE sentence. a. 150 mM NaCl b. 100 mM NaCl plus 50 mM albumin

biology
Predict what would happen to a red blood cell placed in each of the following external solutions. Would it shrink, swell, or not change its volume? Explain each answer in ONE sentence. a. 150 mM NaCl b. 100 mM NaCl plus 50 mM albumin

Writing
no.

Writing
Do you have any connections with the myth you chose? Lack of connectionss? Discuss (write) about your connections.

Writing
Myth Literature Response Questions about Pandora's Box? I need help?!? What happended in the story? (Write is the plot?) Write a summary with rising action, climax and resolution.

Writing
Myth Literature Response Questions about Pandora's Box? I need help?!?

chem post
what are the point groups for mer- Co Cl3 (CO3) and fac- Co Cl3 (CO3)

chemistry
what are the point groups for mer- Co Cl3 (CO3) and fac- Co Cl3 (CO3)

chem
what are the point groups for mer- Co Cl3 (CO3) and fac- Co Cl3 (CO3)

Math
are you good with times? I am struggling with studying with times so help me: The first walker to finish the 12 miles crossed the finish line 3 hours after the offical starting time of 10:00 a.m. At what time did the first walker finish? The judges left the finish line at 5:30...

chemistry
what are the symmetry elements for: cis-CoCl2(NH3)4 and trans-CoCl2(NH3)4 would it be C2 S2?

Choosing High School Courses
Good choice is to choose high school easy: Algebra 1, PE, and home ec (cooking class) or etc.... English is the best for writing strategy, and reading is kind of good.

yes. the solubility of KNO3(s) at 0.0 degree celsius is 15g KNO3/100g H2O. Also, A 320g sample of a saturated solution of KNO3(s) in water is prepared at 25.0 degree celsius (this is part of the info given). i don't know how to solve this.

If 60 g water is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degree celsius, what mass of KNO3(s) will recrystallize?

chemistry: again
What is the predominant type of intermolecular force in I2 (iodine)?

What is the millimolar solubility of oxygen gas,O2, in water at 20 degree celsius, if the pressure of oxygen is 1.00atm?

Estimate the value of the cell potential for the following rxn: Mn02(s) + 4H30+(pH=3.8) + 2Ag(s) --> Mn2+(aq, .1M) + 6H20(l) I got Ecell=.48V delta G circle= -92640 J/mol and delta g = -107484 is this correct?

science
how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life ...

biology
how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life form?

bio
how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life ...

chemistry
an electrochemical cell uses Al and Al+3 in one compartment and Ag and Ag+ in the other write a balanced equation for the rxn that will occur spontaneously in this cell would that just be Al + Al+3 + 2e --> Ag + Ag+ ?

Thank you, Reiny. My teacher taught me something very similar to your method and now I understand it. Thank you for your help! : )

Thank you so much, Damon! You really helped me out! : )

I just cannot seem to be able to grasp the concept of solving polynomial inequalities. Can someone please explain, step by step, how to solve them? Here's a problem I can't solve. Please use this as an example: (x-2)(x-5)<0 I cannot thank you enough for helping me ...

biology
what are the three parts of the cell theory?

science
what are the four properties that can be used to classify elements?

algebra 2
how do you solve this? -2square root7-4square root7

history HHHEEELLLPPP!!!
What is the society and environment of the coastal plains?

chemistry
what is a summary of observed behavior? maybe im thinking about it too much and its simple but im lost! HELP

history
Why did the cowboys go west?

history HHHEEELLLPPP!!!
did the railroad workers go west for job opportunities and technological advances?

history
they went west for job opportunities and for technological advances?

history
what are two reasoms why the railroad workers went west?

history HHHEEELLLPPP!!!
thankyou

history HHHEEELLLPPP!!!
Why did the miners move west? 2 reasons

calculus
Evaluate the following limit lim x^2 + 3x - 40 x-->5 ------------- 3x + 10 - x^2

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