Thursday
July 31, 2014

Posts by Emily


Total # Posts: 2,300

Physics
oh okay i got that ! thanks. for the second part..how long it takes to reach the bottom.. do u use t = d/v?

Physics
yes. but how did you get it because i have different numbers

Physics
I have this same question.. got it wrong

Science
thks

Science
What is a experimental investigation? What is a descriptive investigation?

Physics
Superwoman is hovering above the ground when a person free-falling goes by her at a terminal velocity of 140 km/h. Unfortunately, the parachute does not open. Fortunately, Superwoman is around. If it takes her 1.9 s to realize the person is in distress, what must her accelerat...

Biology
How does a plant growth regulator differ from a plant growth hormone?

AP world history
i have to write a DBQ promt question for the interaction between humans and the enviornment (demography and disease, migration,technology, and patterns of settlement) about roman empire

Physics
Two rugby players are running towards each other. They are 37 m apart. If one is accelerating from rest at 0.5 m/s^2 and the other was already moving at 3.1 m/s and maintains her speed, a)how long before they crunch together? b)How fast was the accelerating player going? c)How...

Physics
A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s^2, how long does it take to catch the speeder?

7th grade
5x-10-2x+7=0 3x-3=0 3x=3 x=1

Physics
Thanks!

Physics
On a velocity-time graph of a person's walk, if a person is slowing down in the positive direction, then acceleration is in the negative direction.For example, the positive direction is [E]. If a person's acceleration is -1m/s^2, then it is 1 m/s^2 [West]. But that doe...

Math
How did u get the answer?

Math
Ali did his homework at school with a graphing calculator. He determined that the equation of the line of best fit for some data was y=2.63x-1.29. Once he got home, he realized he had mixed up the independent and dependent variables. Write the correct equation for the relation...

Math
If f(x)=x^2, what is the domain and range of y=0.5f(3(x-4))-1?

Physics
Thanks!

Physics
If 100 m sprinters accelerate from rest for 3.5 s at 2.8 m/s^2, how far have they run to this point? How long will it take them to complete the 100 m sprint, assuming they maintain their speed the rest of the way? I found the distance, which is 17 m, and the distance they stil...

Economics
Name 2 government bodies or agencies that have an impact on the national housing market. Explain the role of each body or agency in relation to the housing market.

physics
I don't understand this part.... 2) force*distance=1/2 m v^2 force= mass*(4g)/2d= 2*g*mass/.74

chem 101
yay i was right, thank you very much for your help

chem 101
a.write a balanced chemical equation for the complete combustion of sucrose. --- this part of the question i got help on, and thank you b. if combustion is complete, a brown liquid caramel might form, followed by a brown/black solid. what would be the major component of the so...

chem 101
if combustion is complete, a brown liquid caramel might form, followed by a brown/black solid. what would be the major component of the solid?

chem 101
write a balanced chemical equation for the complete combustion of sucrose.

Economics
How can you use information about the business cycle when making a decision about a large purchase?

math
explain why 1734 is greater then 175

italian
How do i say my name in italian.

arithmetic
Thanks 68%

arithmetic
Thanks

arithmetic
I got 102 questions right out of 150 on a math test. What percentage did I get on theis test?

geography
Rivers bring water for ______ and ____. ?????? Fill in the blank with no options.

Geography
What is the second longest river in North America?

physics
A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 21 m/s at an angle of 58° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed is ze...

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 :)

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