Friday
April 18, 2014

Posts by Emily


Total # Posts: 2,268

Physics
Dini is riding her bike eastward at a constant 9.5 m/s when a car pulls out of a side street a short distance in front of her. Dini applies her brakes and manages to stop in 2.5 s, just in time to avoid running into the car. Calculate Dini's average acceleration. The answe...

12th grade maths
How do you express x^2-49? (x+7)(x-7) X(times)X = X^2 (positive 7) (times) (negative 7)= -49 X^2-49 is (x+7)(x-7).

Physics
Sandy is racing her sister home, but they each take a different route. Who will win: the one with the greatest average speed or the one with the greatest average velocity? Explain, using some sample numbers.

Biology
In which of the following environments would you be most likely to find non-vascular plants: in desert soil, near the snow line on a mountain, on a sandy ocean beach, or on the forest floor? Give reasons for your answer.

Physics
It's in my science textbook.

Physics
a)Why is it more important for an aircraft pilot to know the wind velocity than the wind speed? b)Why is it more important for all pilots to use the same conventions when describing velocity?

Biology
Are dicots divided into woody and herbaceous stems?

Physics
Can the average velocity of any trip be greater than the average speed of the trip? Explain.

sunshine mateh
put one digit from {1,0,3,7} in each box to get the correct long division problem

Chemistry
how many electrons are in 3.70 x 10^23 atoms of carbon 13?

MATH
whats the value of 0.4297

Physics
A fisher sets out to check his fishing nets and heads 15 km/h [N] for 0.20 h. After stopping for 0.50h, he travels at 12 km/h [E] for 0.10 h to get to the next set of fishing nets. a) What is the fisher's displacement to get to the first set of nets? ( I got 3 km [N]) b) W...

AP Stats
The distribution of heights of adult American men is approximately normal with mean 69 inches and standard deviation 2.5 inches. Use the 68-95-99.7 rule to answer the following questions: (d) A height of 71.5 inches corresponds to what percentile of adult male American heights...

science
how are alkali metals and alkali earth metals different?

chemistry
How many milliliters of a 0.50 M solution contain 14.0 g of BaCl2 (Barium Chloride)?

Physics
A student travels 6.0 m [E] in 3.0 s and then 10.0 m [N] in 4.0 s. Draw a vector diagram to determine the resultant displacement. Q: How do you know where the starting point is on the graph?

Chemistry
280.43g of NaCl is needed to raise the boiling point to 100 degrees.

science
how is it possible to have a negative sun angle?

AP Stats
I generally know how to use the normalcdf function on my calculator, but how to I find the area under a normal curve if there is no lower limit or no upper limit? For instance, we are required to use a calculator on this problem: Find the area under the standard normal curve t...

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 eq...

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 fro...

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 fro...

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

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 a...

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)

Physics
Oh, okay thanks!

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 cert...

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?

s.s
thanks

s.s
What is the definition for a scale on a map?

physics
sorry cant answer this question the picture does not show thanks!

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

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

social studies
what is a legand

Chemistry
net ionic equation of Na2CO3+2HC2H3O2-->CO2+h2o+2Na2H3O2

Math
Thank you!

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

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

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.

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 wit...

Math
Thanks!

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.

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

chemistry
Why does a certain reagent shift the ionic reaction in the desired direction?

business
International issues of social responsibility and ethical behavior are:

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 ...

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!!!

Chemistry
thanks!

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)

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 ...

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 ...

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! O...

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

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?

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.

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

business
anyway would be great:) im struggling with the class.

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 resul...

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 ...

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?

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...

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)

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 d...

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

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?

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?"

Math Analysis
Thank you :)

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?

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.

English
Is there a verb for "question someone doubtfully or suspiciously"?

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"?

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

English
thanks!

English
Thank you!

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

Physics
Thank you!

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?

Honors Chemistry
Thanks so much!! This helped a lot!! :)

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 som...

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?

math
how to solve y= 3cos2x + 5 pls help me

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 i...

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?

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..

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

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

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?

Physics
thanks!

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

Physics
thanks!

Physics
What is a mirror ( reflective surface and back) made out of?

Phsyics
Can you explain to me how an LCD works?

Physics
Thanks you!

Physics
What gases are in a fluorescent and incandescent bulb?

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?

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

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

Physics
How do you see your reflection in a plane mirror?

Calculus
Find the absolute max of f(x)=5x-e^(5x)

Physics
Does the law of reflection only apply to mirrors or any object?

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