Thursday
October 23, 2014

Posts by Emily


Total # Posts: 2,343

physics
find the frictional force between an air hockey puck and the table, assume u air = 1.8 X 10^-5 kg/ms, the puck is 0.013 above the table, the puck has an area of 25 cm^2
October 19, 2010

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium ...
October 19, 2010

chemistry
A coal burning plant that burns 4 metric tons of coal containing 2% sulfur (S) requires 1 metric ton of wet limestone (calcium carbonate) to remove 90% of the sulfur. The process prevents most of the sulfur from being emitted as sulfur dioxide to the air by producing calcium ...
October 19, 2010

precalc
find where f(x)<0 and f(x)>0 f(x)=xlnx-2x
October 18, 2010

Math
Given f(x)=7-2(x-1)^2, x>= 1, determine f inverse (5).
October 18, 2010

Math
Given f(x)=2x^2-1, determine the equation of the inverse.
October 18, 2010

Math
Given f(x)=7-2(x-1)^2, x>= 1, determine f inverse (5).
October 18, 2010

Chemistry
what is the wavelength of the photon emitted when an electron drops from a 4p orbital to a 2p orbital in a hydrogen atom
October 18, 2010

Biology
A cell has a salt concentration of 0.2 %. If it is placed into a solution with a salt concentration of 0.1 %. a) What change will occur to the salt concentration inside the cell? b)What change will occur to the water concentration inside the cell? c)What condition will ...
October 18, 2010

Economics
True or false: The US must remove tariffs and quotas to open trade with foreign countries. Consider the following issues: The definition of tariffs and quotas. The strength of the dollar on domestic and global economies. Benefits from tariffs or quotas, including examples. ...
October 18, 2010

Chemistry
Given a 2.5 kg solution of phosphoric acid and water (56 % phophoric acid, by mass), calculate the number of moles of phosphoric acid.
October 18, 2010

Chem
I got 100125 is that correct?
October 17, 2010

Chem
The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?
October 17, 2010

Chem
The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?
October 17, 2010

calculus
Find the equation of a cubic function that gives you the surface area of the cans given a set volume. The set volume is 300ml
October 17, 2010

History
yes
October 17, 2010

Photography
What's the difference between the setting of the enlarger height and focusing the image? Aren't both of the dealing with the light that shines onto the baseboard?
October 17, 2010

Math
What does it mean by: Show that the "value of 3x^2-6x+5" cannot be less than 1. ?
October 15, 2010

Physics
Oh! thanks! I understand it now :D
October 15, 2010

Physics
So it's 20 x 0.8=16?
October 15, 2010

Physics
A certain force made a 5.0 kg mass accelerate at 4.0 m/s^2. This same force made another object accelerate at only 0.8 m/s^2. Find the mass of the second object. I have no idea how to do this. Do i use m=1/a? What do i do?
October 15, 2010

Physics- Newton's 1st and 2nd Law
Thank you so much for the help!!
October 14, 2010

Physics- Newton's 1st and 2nd Law
Please help me :( Briefly explain the following scenario's using Newton's first law. a) Trevor wants to tow Kevin's car with his truck. He attached a small tow rope between the vehicles and leaves the rope slack (loose). Trevor quickly accelerates forwards making ...
October 14, 2010

Math
What are the vertical and horizontal stretch/compressions for the functions h(x)=1/(5x) and k(x)=|0.4x| ?
October 11, 2010

physics
A car drives straight off the edge of a cliff that is 56 m high. The police at the scene of the accident note that the point of impact is 129 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
October 11, 2010

Physics
I understand the mass should be divided by the density for the required volume. I dont think that I am using the correct numbers. I came up with a volume of 172800 or 1.7 x 10^5 but the answer is incorrect. Can you please help?!! I did (1000V)(10)(500) = 1.7x 10^5
October 11, 2010

Physics
where would I use the 9.8m/s^2? And the density is which number?
October 11, 2010

Physics
To store the energy produced in 1.5 hour by a 160 MW (160 10^6 W) electric-power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Assume the upper reservoir is 500 m above the lower and we can neglect the small change in ...
October 11, 2010

Math
A 5 m stepladder propped against a classroom wall forms an angle of 30 degree with the wall. Exactly how far is the top of the ladder from the floor? Express your answer in radical form. What assumption did you make?
October 10, 2010

math
find a function y=ax^2+bx+c whose graph has an x-intercept of 1, a y-intercept of -2, and a tangent line with slope -1 at the y-intercept.
October 9, 2010

Math
Given any right triangle with an acute angle theta, a) Explain why csc theta is always greater than or equal to 1 b) Explain why cos theta is always less than or equal to 1
October 8, 2010

hist
who were the pilgrims and what did they believe?
October 8, 2010

algebra
A brick border that is x feet wide is built around a rectangular patio. The patio is 6 feet wide and 8 feet long. The combined area of the patio and the brick border is 120 square feet. What is the width of the brick border?
October 7, 2010

algebra
If the area of a square is 9x2-12xy+4y2, what is the perimeter of the square in terms of x and y. *its 9x squared and 4y squared i have several problems like this on my homework if you show me how to do this one im sure i could figure out the rest
October 6, 2010

algebra
Elliot is 5 times as old as Sid. Ten years from now, Elliot will be at least 3 times as old as Sid will be then. At least how old is each person now?
October 6, 2010

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...
October 6, 2010

3rd grade
200
October 6, 2010

Physics
i do not think that is correct because i am getting the incorrect answer.
October 6, 2010

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...
October 6, 2010

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...
October 6, 2010

Physics
A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...
October 6, 2010

Physics
nope :(
October 5, 2010

Physics
kk got that. did you get number 18?
October 5, 2010

Physics
okay ! and which q'n did u get 255 m for?
October 5, 2010

Physics
k i got this one.. find the t it takes for each runner using t=d/v....then subtract the times, and you have the answer !
October 5, 2010

Physics
A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...
October 5, 2010

Physics
You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
October 5, 2010

Physics
alrighttyy. did u get number 13, 14 or 18?
October 5, 2010

Physics
okay thanks ! was your velocity really small and negative then?
October 5, 2010

Physics
okay but what does 'u' refer to? Also, for question #7, how did you figure out the total velocity for the entire trip?
October 5, 2010

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?
October 5, 2010

Physics
yes. but how did you get it because i have different numbers
October 5, 2010

Physics
I have this same question.. got it wrong
October 5, 2010

Science
thks
October 5, 2010

Science
What is a experimental investigation? What is a descriptive investigation?
October 5, 2010

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 ...
October 3, 2010

Biology
How does a plant growth regulator differ from a plant growth hormone?
October 3, 2010

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
October 3, 2010

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...
October 2, 2010

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?
October 2, 2010

7th grade
5x-10-2x+7=0 3x-3=0 3x=3 x=1
October 1, 2010

Physics
Thanks!
October 1, 2010

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 ...
October 1, 2010

Math
How did u get the answer?
October 1, 2010

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...
October 1, 2010

Math
If f(x)=x^2, what is the domain and range of y=0.5f(3(x-4))-1?
September 30, 2010

Physics
Thanks!
September 30, 2010

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 ...
September 30, 2010

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.
September 29, 2010

physics
I don't understand this part.... 2) force*distance=1/2 m v^2 force= mass*(4g)/2d= 2*g*mass/.74
September 29, 2010

chem 101
yay i was right, thank you very much for your help
September 29, 2010

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 ...
September 29, 2010

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?
September 29, 2010

chem 101
write a balanced chemical equation for the complete combustion of sucrose.
September 29, 2010

Economics
How can you use information about the business cycle when making a decision about a large purchase?
September 28, 2010

math
explain why 1734 is greater then 175
September 27, 2010

italian
How do i say my name in italian.
September 27, 2010

arithmetic
Thanks 68%
September 23, 2010

arithmetic
Thanks
September 23, 2010

arithmetic
I got 102 questions right out of 150 on a math test. What percentage did I get on theis test?
September 23, 2010

geography
Rivers bring water for ______ and ____. ?????? Fill in the blank with no options.
September 21, 2010

Geography
What is the second longest river in North America?
September 21, 2010

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 ...
September 20, 2010

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 ...
September 20, 2010

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).
September 20, 2010

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.
September 19, 2010

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.
September 19, 2010

Physics
It's in my science textbook.
September 18, 2010

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?
September 18, 2010

Biology
Are dicots divided into woody and herbaceous stems?
September 18, 2010

Physics
Can the average velocity of any trip be greater than the average speed of the trip? Explain.
September 17, 2010

sunshine mateh
put one digit from {1,0,3,7} in each box to get the correct long division problem
September 16, 2010

Chemistry
how many electrons are in 3.70 x 10^23 atoms of carbon 13?
September 16, 2010

MATH
whats the value of 0.4297
September 14, 2010

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) ...
September 14, 2010

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...
September 14, 2010

science
how are alkali metals and alkali earth metals different?
September 14, 2010

chemistry
How many milliliters of a 0.50 M solution contain 14.0 g of BaCl2 (Barium Chloride)?
September 14, 2010

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?
September 14, 2010

Chemistry
280.43g of NaCl is needed to raise the boiling point to 100 degrees.
September 14, 2010

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