Tuesday
October 21, 2014

Posts by emily


Total # Posts: 2,341

physics
my answer for this question came out to be 1.16 m. However when I plug it into the Physics homework program it say incorrect. My equation for t was: 1.25 m = 0m + 4.952sin34t - 4.9t^2 and then I did the quadratic equation and got t= .28258 I then did the horizontal distance ...
September 12, 2010

physics
A small steel ball bearing with a mass of 28.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.25 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 34.0 deg ...
September 12, 2010

physics
A small steel ball bearing with a mass of 28.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.25 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 34.0 deg ...
September 12, 2010

Physics
If you can throw a ball vertically upward to a height h = 30.1 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed
September 12, 2010

Physics
A Hollywood daredevil plans to jump the canyon shown in the figure on a motorcycle. There is a 15. m drop and the horizontal distance originally planned was 60. m but it turns out the canyon is really 65.7 m across. If he desires a 3.1-second flight time, what is the correct ...
September 12, 2010

Physics
Convert 341 m/s into km/h. (I have to leave the final answer to the correct number of digits according to the certainty rule for multiplying and dividing)
September 9, 2010

Physics
Oh, okay thanks!
September 8, 2010

Physics
Calculate the answer for the following question and state the answer with the correct certainty and units. Given the values of b and h, find A. b=3.2 cm, h=10.1 cm A=1/2bh The answer is 16 cm^2, which was rounded to two significant digits from 16.16 cm^2,because 3.2 has a ...
September 8, 2010

chemistry
when acidified potassium dichromate (VI) is added to iron(II) sulfate why does a redox reaction occur? How about if ammonia is added to iron(II) sulfate?
September 7, 2010

s.s
thanks
September 6, 2010

s.s
What is the definition for a scale on a map?
September 6, 2010

physics
sorry cant answer this question the picture does not show thanks!
September 6, 2010

physics
you can`t because the height of the ball is higher than the ball bounces thanks!
September 6, 2010

science
not sure,but i would like to ask you a question about science would that be ok? thanks!
September 5, 2010

social studies
what is a legand
September 2, 2010

Chemistry
net ionic equation of Na2CO3+2HC2H3O2-->CO2+h2o+2Na2H3O2
September 1, 2010

Math
Thank you!
August 23, 2010

Math
Determine the equation of the parabola with roots 2+sqrt(3) and 2-sqrt(3), and passing through the point (2,5).
August 23, 2010

Math
Bobpursley, how do you know that the peak is at (3,15)?
August 22, 2010

Math
An engineer is designing a parabolic arch. The arch must be 15 m high, and 6 m wide at a height of 8 m. a) Determine a quadratic function that satisfies these conditions. I've got : 8=a(6-h)^2+15, but i don't know what to do next.
August 22, 2010

Math
Question: A tunnel with a parabolic arch is 12 m wide. If the height of the arch 4 m from the left edge is 6 m, can a truck that is 5 m tall and 3.5 m wide pass through the tunnel? Justify your decision. I drew the graph of the arch with x-intercepts (0,0) and (12,0) , and ...
August 19, 2010

Math
Thanks!
August 17, 2010

Math
If f(x)=x^2-6x+14 and g(x)=-x^2-20x-k, determine the value of k so that there is exactly one point of intersection between the two parabolas.
August 17, 2010

algebra1
how do you simply this? square root of 1500/20 (the / means over) please show steps. thanks!
August 11, 2010

chemistry
Why does a certain reagent shift the ionic reaction in the desired direction?
August 4, 2010

business
International issues of social responsibility and ethical behavior are:
August 1, 2010

Physics
I have two questions, both are about angular momentum so I thought I'd post them together. I'm really confused on anything regarding rolling wheels and things like that (help me please!. It seems as though the whole chapter was amassed of all of the topics I cant wrap ...
July 30, 2010

Physics
Looks like we both have angular momentum problems. Im just as far along as you, I only have the formulas... Hopefully someone will know what to do!!!
July 30, 2010

Chemistry
thanks!
July 15, 2010

Chemistry
Using the activity series, explain the reason that most metals cannot exist in nature as elements but are found as compounds instead. Use specific examples to explain your answer. (Hint: Consider the reactivity of metals with water)
July 15, 2010

Physics
A railroad flatcar is traveling at the speed of 13.0 m/s relative to an observer standing on the ground. Someone is riding a motor scooter on the flatcar. What is the velocity(magnitude and direction)of the motor scooter relative to the flatcar if its velocity relative to the ...
July 13, 2010

Physics
A railroad flatcar is traveling at the speed of 13.0 m/s relative to an observer standing on the ground. Someone is riding a motor scooter on the flatcar. What is the velocity(magnitude and direction)of the motor scooter relative to the flatcar if its velocity relative to the ...
July 13, 2010

German
Could someone please check if this is correct German? Thanks. Wenn man nicht über einen Fernseher, ich glaube, sie sind zu verpassen. Es ist eine gute Sache in der Lage sein, den Menschen zu sprechen, denn es ist immer ein gutes Programm, dass viele Menschen mögen! ...
June 22, 2010

Biology
please help !!! were you able in all cases to determine the parent and meiotic stage of origin of the nondisjunction?
June 14, 2010

English
I need hep writing an essay about the defects of two adults in Romeo and Juliet that caused their children's disobedience. What possible characters can I do, and what main ideas should I write for each character?
June 10, 2010

English-Romeo and Juliet
How did the wedding being moved earlier a day affect Friar Laurence's plan and cause the two lovers' death? Even if the wedding wasn't moved up, Friar John would still have been quarantined by rhe plague and wouldn't have been able to deliver the message to Romeo.
June 9, 2010

math
If the measure of angle 1 is 123 degrees, find the measure of <2, <3, <4,<5, <6, <7, <8
June 7, 2010

business
anyway would be great:) im struggling with the class.
June 6, 2010

business
You work as the manager of the second largest bank in your region of the United States. The bank's top management team has asked you to present an overview of how the current economy and financial changes have impacted your business and what changes must be made as a ...
June 6, 2010

chemistry
When enough NaCl(s) is added to the compartment containing gold to make the [Cl -] , the cell potential is observed to be 0.31 V. Assume that Au3+ is reduced and assume that the reaction in the compartment containing gold is Au3+(aq) + 4Cl- (aq) ↔ AuCl4- . Calculate the ...
June 5, 2010

English
Is the "sober-suited matron" in Romeo and Juliet(Act 3,Scene 2,line 11)a metaphor? If it is, what is it being compared to?
June 3, 2010

finance
Last year Charter Corp. had sales of $300,000, operating costs of $265,000, and year-end assets of $200,000. The debt-to-total-assets ratio was 25%, the interest rate on the debt was 10%, and the firm's tax rate was 35%. The new CFO wants to see how the ROE would have been...
May 31, 2010

Climate Change
State two reasons why you would expect the climate in Nigeria(near the equator)to be warmer than the climate in Greenland(closer to the North Pole)
May 31, 2010

Physics
An image of a candle is produced by a convex lens 14 cm away. If the focal length of the lens is 7 cm, how far from the lens is the candle placed? (USe the thin lens equation) For this question, how would you know whether the image is virtual or real?(in order to know if the ...
May 27, 2010

Honors Chemistry
I didn't realize that this problem was so simple :P thanks so much!
May 25, 2010

Honors Chemistry
If the percent (mass/mass) for a solute is 20% and the mass of the solution is 300 g, what is the mass of the solute in solution?
May 25, 2010

Math Analysis
Can someone help me with this problem, please? Thanks!! "A ship leaves port and sails for 2 hours northeast and then 3 hours northwest. If the speed remains constant, what course should the ship take home?"
May 25, 2010

Math Analysis
Thank you :)
May 24, 2010

Math Analysis
Can someone check my answers please? Thank you! If tan x = 3/5, evaluate: 1) tan 2x 2) tan 3x ==> For #1, I got 15/8; for #2, I got -99/5. Are these answers correct?
May 24, 2010

English
Wha are the nouns that describe a person called? They are like a noun that describe's a person's perosnality, such as perfectionist, troublemaker, bookworm etc.
May 24, 2010

English
Is there a verb for "question someone doubtfully or suspiciously"?
May 24, 2010

english
Using the four basic plot elements from the dramatic plot (exposition, complication, climax, resolution), how would I outline the progression of the main conflict in "The Miracle Worker"?
May 23, 2010

English
I need an adjective to describe someone who does not like to take the lead, or initiative. Thanks in advance!
May 23, 2010

English
thanks!
May 23, 2010

English
Thank you!
May 23, 2010

English
I need a character trait to describe someone who does not think or plan ahead. Thanks in advance!:)
May 23, 2010

Physics
Thank you!
May 22, 2010

Physics
Subject: Light and Geometric Optics Question: Where must a light source be placed in front of a concave mirror for a) light energy to be concentrated to a single point b)the light to be reflected in a parallel beam?
May 22, 2010

Honors Chemistry
Thanks so much!! This helped a lot!! :)
May 20, 2010

Honors Chemistry
"Would it be possible to have an addition polymer synthesized from a monomer that has only single bonds? Why or why not?" ==> I know that an addition polymer can only be synthesized from a monomer that has double bonds, but my textbook did not explain why. Can ...
May 20, 2010

geometry
The measures of the angles in quadrilaterals are in the extended ratio of 3:4:5:6. What are the measures of the angles?
May 19, 2010

math
how to solve y= 3cos2x + 5 pls help me
May 18, 2010

Chemistry
I know this is supposed to be a really easy concept, but I need help with balancing redox reactions: KClO3 ==> KCl + O2 My textbook says to write the ionic equation next, which I have written like: K(+1) + ClO3(-1) ==> K(+1) + Cl(-1) + O2(-2) (the number in parentheses ...
May 17, 2010

Chemistry
An air bubble has a volume of 0.500 L at 26 Celsius. If the pressure does not change, what is the volume, in liters, at -14 Celsius? If the pressure does not change, what is the volume, in liters, at 600 k?
May 17, 2010

Math Analysis
Use the half-angle formula to find the exact value of cos(x/2) when tanx = -5/8 and x is in quadrant IV. (| is a radical) ==> I got sqrt((89 + 8sqrt(89))/178). Is this correct? I hope my answer is easy to read..
May 3, 2010

math analysis
There's a hidden trigonometric identity.... 2sinxcosx ==> 4sinxcosx = 1 2(2sinxcosx) = 1 2sin2x = 1 Then you solve for x :)
May 3, 2010

Math Analysis
Oops, yeah those were supposed to be radicals :) thanks so much!!!!
May 3, 2010

Math Analysis
Find the exact value of cos(x/2) if sin x = 3/4 and x is in quadrant II. ==> I got ã(4-ã7)/2. Is this correct?
May 3, 2010

Physics
thanks!
May 3, 2010

Physics
Which is more harmful---smaller wavelength, like gamma ray, or larger wavelength, like radio waves?
May 3, 2010

Physics
thanks!
May 2, 2010

Physics
What is a mirror ( reflective surface and back) made out of?
May 2, 2010

Phsyics
Can you explain to me how an LCD works?
May 1, 2010

Physics
Thanks you!
May 1, 2010

Physics
What gases are in a fluorescent and incandescent bulb?
May 1, 2010

Physics
How when light rays travel outward from their light source in all directions, they are not parallel to each other, but when they approach an object they are parallel to each other?
May 1, 2010

Physics
DO diffuse reflections still follow the law of reflection? (Angle of incidence equals angle of reflection)?
May 1, 2010

us history
Do you think the changes in the 1920s gave Americans more control over their lives? Explain
April 29, 2010

Physics
How do you see your reflection in a plane mirror?
April 29, 2010

Calculus
Find the absolute max of f(x)=5x-e^(5x)
April 28, 2010

Physics
Does the law of reflection only apply to mirrors or any object?
April 28, 2010

Honors Chemistry
Ohhhh I see now! Thanks so much!! :)
April 27, 2010

Honors Chemistry
That's supposed to be q = mc(delta)T
April 27, 2010

Honors Chemistry
I have two questions on my review study guide that go like this: 1) What is the equation for calculating the energy change that occurs when a substance changes state? 2) What is the equation for calculating the energy change that occurs when a substance increases in ...
April 27, 2010

Physics
A balloon appears to be yellow when seen in white light. Explain the colour it will appear in a) green light and b) magenta light. I really don't undestand the subtractive theory of light, and it applies to this question. Can you plese explain to me how to get the answer? ...
April 25, 2010

chemistry
when 5.0 g of CaCl2 is dissolved in 50 g of water, how do you get the boiling temperature of 101.5 degree c
April 22, 2010

Math
Idk . how to even do ?
April 20, 2010

Math
The Relatioship between x and y is y=5x + 18 How does the value of y change when x increses form 1 to 4? a. y increase by 15 b. y increase by 3 c. y decresases by 3 d y dercreased by 15 Help Prettty Pleassseee !
April 20, 2010

geometry
write an expression for the sum of the angle measures in a regular polygan with n sides. then wirte an expression for the measure of each angle in a regular polygan with n sides.
April 19, 2010

Chemistry
Why is it not a good idea to use an antacid routinely? (two reasons)
April 18, 2010

Chemistry
How come the charges of H*2O*2 (asterisk means subscript), which is hydrogen peroxide,don't equal? The charge of hydrogen is 2, and the charge of O is 4. For an ionic compound you can figure out the formula by the charges(when the charges of the ions add up to zero) but ...
April 17, 2010

S.S
Could you drive from Wisconsin to Michigan without crossing another state? If yes, how? If no, why not?
April 17, 2010

Social Studies
What is the name of the only colony on the South American continent?
April 17, 2010

Chemistry
If you have to write the products of the chemical reaction Fe+O*2( asterisk means subscript),how would you know the charge of Fe in the compound FeO? If the charge is 2+, then the product would be FeO, but if the charge was 3+, then the product would be Fe*2O*3. Thanks!
April 17, 2010

Chemistry
Suppose you place a kettle on the stove and boil some water.Is the steam that forms physical of chemical change?
April 16, 2010

math
what is the perimeter of a rectangle that measures 27 inches on one side and 56 inches on the other side?
April 14, 2010

business law
Please give me some insight on a law hypo...? This is the hypo: Joe received an advertising brochure from X Corp. in the mail. The brochure contained a photo of a Peach 442 computer, and above it the statement, "While supplies last. All Peach computers on sale at 25% ...
April 14, 2010

Physics
i figured it out after all - thanks
April 13, 2010

Physics
The work function for potassium is 2.24eV. If potassium metal is illuminated with light of wavelength 310 nm, find the maximum kinetic energy of the photoelectrons. I have tried everything and still keep getting the wrong answer. The speed of light is 3 × 108 and Planck...
April 13, 2010

fraction comparisons
Max did 19 situps. This is 1/7 as many as Isabel. How many situps did Isabel do?
April 12, 2010

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