Monday
December 22, 2014

Posts by katie


Total # Posts: 1,716

Chemistry help
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.77 nm. It then gives off a photon having a wavelength of 94 nm. What is the final state of the hydrogen atom?
February 20, 2014

College Algebra
A ball is thrown upward with an initial velocity of 48 ft/sec from a height 640 ft. Its height h, in feet, after t seconds is given by h(t)=-16t^2+48t+640. After how long will the ball reach the ground?
February 20, 2014

Chemistry
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 7.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 8.40 ...
February 19, 2014

TN History
Ive figured most out now, but i dont know how the state government in tn restore after the reconstruction era.. any book or website that would help answering this. ive tried for a while now and im not making any progress with this one single question.
February 18, 2014

TN History
Im not sure. It did help the slaves, but the whites didnt handle it all that well... they formed the KKK and right after this, the Confederates changed laws. so im not too sure...
February 18, 2014

TN History
how well did Tennessee deal with the four issues of Reconstruction; the status of its former Confederates, the restoration of the state government, economic reconstruction, and the status of former slaves? (Just one sentence would help me a lot... i know a lot of info but not ...
February 18, 2014

English
What resource whether its online etc can LGBT community support, how can they get help? Thanks!
February 15, 2014

physics
A stereo speaker represented by P in the figure below emits sound waves with a power output of 114 W. What is the intensity of the sound waves at point x when r = 11.8 m?
February 12, 2014

math
What is the approximate circumference of a pizza pan with a diameter of 13.2 inches? (Use π = 3.14)
February 5, 2014

physics
The wavelength of a pulse is 0.1925mm. There are 5 cycles in the pulse. What is the spatial pulse length?
February 5, 2014

physics
The pulse duration of the transducer is 0.6 microseconds. The frequency of the transducer is 8MHz. How many cycles are contained in that pulse?
February 5, 2014

physics
what is the propagation speed of a 5MHz transducer?
February 5, 2014

physics
The medium would be soft tissue. The speed in soft tissue is 1540 m/s.
February 5, 2014

physics
What is the wavelength of a 4MHz transducer?
February 5, 2014

physics
Yes, all my questions are for ultrasound physics. I should've mentioned that, sorry. Thanks for the help
February 5, 2014

physics
If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?
February 5, 2014

Physics
I know the formulas, just having problems with the right units. I got 1205 Hz for this one????
February 5, 2014

Physics
If the period of a transducer is 0.83msec, what is the HZ?
February 5, 2014

physics
so would it be 0.2 microseconds? I just want to make sure I am understanding it correctly, with the correct units, thanks
February 5, 2014

physics
If the frequency of a transducer is 5MHz, what is the period?
February 5, 2014

Chemistry
The FDA recommends that women who are pregnant avoid eating more than three 6.00-oz servings of bluefish per month because of the relatively high mercury levels in that type of fish. If bluefish contains 0.341 ppm of mercury (that is, 0.341 oz of mercury per 1×106 oz of ...
February 1, 2014

Chemistry
An office heater puts out 2070 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous operation)?
February 1, 2014

physics
the total electric field e consists of the vector sum of two parts. one part has a magnitude of e1 = 1284 n/c and points at an angle θ1 = 30° above the +x axis. the other part has a magnitude of e2 = 1833 n/c and points at an angle θ2 = 62° above the +x axis...
January 31, 2014

Chemistry
A particular MP3 encoder can convert 79.0 kilobytes (kb) of music per second from a typical music CD. How many minutes will it take to convert 13.3 megabytes (Mb) of music from a CD?
January 29, 2014

Algebra
ok thanks
January 22, 2014

Algebra
Jena wants to paint the walls in her square shaped bedroom. each wall has an area of 130 sq ft. if one quart of paint covers 150 sq ft, how many quarts of paint will she need to buy to paint all four walls? Would I leave it 4.6 or round up to five quarts?
January 22, 2014

someones GOTTA help me with this science...!!!
1. B 2. A 3. C 4. D 5. A I'm in Connexus as well, and I got a 100% with those answers:)
January 20, 2014

physics
How long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixty-fourth of its original strength?
January 15, 2014

Science
I mean I would like to know how to work it out and not just get the answer but thanks for the help.
January 14, 2014

Science
What is the radius in nm of the electron orbit of a hydrogen atom for n=3? What is the radius in nm of the electron orbit of a hydrogen atom for n=4?
January 14, 2014

math
A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she start with? You must use a bar model to solve this problem.
January 12, 2014

science please check my answer
How do I find the average acceleration of the ball?
January 11, 2014

science please check my answer
I got 57. 06 N, is that correct?
January 11, 2014

science please check my answer
A boy climbs to the roof of his house and drops a 0.40 kg rubber ball from the 7.5-meter peak of the house. How much energy was lost in the process? So I got 48 J is this correct? The bounce takes place over a 170 ms time interval. What is the impulse given to the ball during ...
January 11, 2014

science
A boy climbs to the roof of his house and drops a 0.40 kg rubber ball from the 7.5-meter peak of the house. How much energy was lost in the process? The bounce takes place over a 170 ms time interval. What is the impulse given to the ball during this time?
January 10, 2014

Algebra
Explain why n*0=0
January 9, 2014

Math
Write the equation of the line in standard form: (-3, 6); m = 1/2 (1, 0) & (-5, 3) Write the equation of the line perpendicular to 4x – 5y = -10 through the point(2, 3). Write the equation in slope intercept form.
January 8, 2014

Math
Write the equation of the line in slope intercept form: (4, 7); m = -3/8
January 8, 2014

Math
They all equal 3/4 cool thanks
January 8, 2014

Math
For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. X 52 = 32 = 20 = 8 Y 39 = 24 = 15 = 6
January 8, 2014

Math
Part 1: When writing linear equations, how do you determine which form of a line to use? Part 2: Choose 1 set of points from the choices below. Then, solve the problem and post your solution, showing your steps. Write an equation in point-slope form for the line that passes ...
January 8, 2014

Math
Find the range of each function for the given domain. 1. f(x) = -2x + 1; {-6, -2, 0} 2. f(x) = x3 + 1; {-2, -1, 3}
January 7, 2014

Algebra
Help Please Write a function rule that represents each sentence. 1. 11 less than the product of a number y and -2 is z. 2. 5 less than the quotient of a number n and 4 is m.
January 7, 2014

chemistry
1- A compound is 87.5% nitrogen and 12.5% hydrogen. The molecular weight of the compound is 32 g/mol. Describe the molecule referencing shape, and inter-molecular forces. 2- Gaseous butadiene, C4H6 , reacts with hydrogen gas in the presence of a platinum catalyst to form ...
January 6, 2014

chemistry
Consider the following reaction: CH3X + Y  CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8.44 x 10-5M 5.7 2.75 x 10-...
January 6, 2014

Physics
Mutiple choice: A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined. Which of the following is not acceleration? A.) rate of change of speed in a particular direction B.) rate of change of motion in a...
December 17, 2013

Physics
The innerspring mattress on your grand- mother’s bed is held up by 23 vertical springs, each having a spring constant of 6000 N/m. A 43 kg person jumps from a 1.93 m platform onto the innersprings. The acceleration of gravity is 9.8 m/s2 . Assume: The springs were ...
December 16, 2013

physics
A child and sled with a combined mass of 47.4 kg slide down a frictionless hill that is 8.61 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
December 5, 2013

math
Angela scored in the 90th percentile of her class math test. If 27 students scored the same as or lower than she did, how many students are in the class?
December 5, 2013

math
In a game played with 50 letter tiles, 21 of the tiles are vowels. If a tile is drawn at random, what is the probability that it is a consonant.
December 5, 2013

math
A recipe for a fruit shake calls for 5 parts milk, 3 parts banana puree, and 2 parts strawberry juice. Find the quantity of each ingredient necessary to make an 8 ounce shake.
December 5, 2013

math
A laptop that originally cost $1,200 is on sale for $950. Find the discount rate.
December 5, 2013

Algebra 1
Name the property that is demonstrated by the example. 1. (2x)^3=2^3*x^3=8x^3 I am not sure what to put
December 2, 2013

MATH :)
For each of the following measurements state the number of significant digits: A length of 2.3 meters A volume of 0.65 liters A time of 0.0004 secs A population of 65,000,000 A distance of 1.30 x 104 I got: 1. 2 2. 2 3. 1 4. 2 5. 2 Just need someone to check my answers please ...
November 30, 2013

Algebra 1
oh thanks
November 25, 2013

Algebra 1
Sorry problem on left answer on right
November 25, 2013

Algebra 1
The problem is on the right and the answer is on the left
November 25, 2013

Algebra 1
square root to nearset integer 125 11 200 14 -47 -6
November 25, 2013

Statistics
Many dairy cows now receive injections of BST, a hormone intended to spur greater milk production. A group of 53 Jersey cows increased average milk production from 43 to 52 pounds per day, with a standard deviation of 4.8 lbs. Is this evidence that the hormone maybe effective ...
November 24, 2013

painting
how can you paint
November 22, 2013

Decision Sciences
Use graphical sensitivity analysis to determine the range of demand probabilities for which each of the decision alternatives has the largest expected value. I have two possible decisions, each with a favorable and unfavorable outcome. How do I do this?
November 18, 2013

Statistics
A survey was conducted to determine if there is a difference in gasoline mileage for two types of trucks, truck A and truck B. A random sample was taken for each model of truck, and the mean gasoline mileage, in miles per gallon, was calculated. Identify the appropriate ...
November 15, 2013

Statistics
To do inferential procedures comparing two proportions, we need another variance formula (our ruler). This formula is based on what principle? A) The variance of the difference of two statistics is the difference of the variances of each statistic. B) The variance of the ...
November 15, 2013

math
Do I use the Foil method to find the product of (9-3i)(9+4i)?
November 15, 2013

Statistics
You are given the following information obtained from a random sample of 6 observations. Assume the population has a normal distribution. 13 14 17 14 17 15 a. What is the point estimate of µ? b. Construct an 80% confidence interval for µ. c. Construct a 98% ...
November 12, 2013

Statistics
The monthly incomes from a random sample of workers in a factory are shown below. Monthly Income (In $1,000) 4.0 5.0 7.0 4.0 6.0 6.0 7.0 9.0 a. Compute the standard error of the mean (in dollars). b. Compute the margin of error (in dollars) at 95% confidence. c. Compute a 95% ...
November 12, 2013

Math
jim claims that the ratio of males to females in his class of 26 students is 3:2. Could jim be correct?
November 11, 2013

Math
Thank you so much Ms. Sue! You have been so much help :)
November 11, 2013

Statistics
The U.S. Department of Labor and Statistics released the current unemployment rate of 5.3% for the month in the U.S. and claims the unemployment has not changed in the last two months. However, the states statistics reveal that there is a decrease in the U.S. unemployment rate...
November 11, 2013

Statistics
To plan the budget for next year a college needs to estimate what impact current economic downturn might have on student requests for financial aid. Historically, this college has provided aid to 35% of its students. Officials look at a random sample of this year’s ...
November 11, 2013

Chemistry
A sample of unknown metal has a mass of 36.7 g. This metal was placed in boiling water at 96.0oC until the metal had reached the temperature of the water. The metal was then placed in a foam cup with 50.0 g of water in it at 20.0oC. The cup absorbs 42.0 J/oC, and the ...
November 10, 2013

Statistics
Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
November 10, 2013

Statistics
Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
November 10, 2013

Statistics
According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
November 10, 2013

Statistics
According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
November 10, 2013

Statistics
According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
November 10, 2013

Algebra 1 HELP
Thank You
November 9, 2013

Algebra 1 HELP
The number of gallons needed of paint needed to cover a wall varies directly with the area of the wall. The Robertsons find that they have used 1/2 gallon of pain to cover 540 square feet of wall. Which of the follow equations shows the number of gallons of paint they will ...
November 9, 2013

Statistics
30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. The 99% confidence interval is ( ounces, ounces). Round each result to two decimal places.
November 9, 2013

Statistics
30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. Test the claim that cans of coke have a mean amount of cola greater than 12 ounces. What is the p-value? A) ...
November 9, 2013

Statistics
A researcher performs a hypothesis test to test the claim that among girls aged 9-10, the mean score on a particular aptitude test differs from 72, which is the mean score for boys of the same age. Data were collected from a random sample of 43 girls aged 9-10 years and the 95...
November 8, 2013

Statistics
A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 30 minutes. The owner has randomly ...
November 8, 2013

physics
A 66.5 kg ice skater moving to the right with a velocity of 2.09 m/s throws a 0.14 kg snowball to the right with a velocity of 22.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
November 3, 2013

Algebra 1
Can someone help me I really don't get this one The table shows the number of trolley buses in operation in the United States during certain years. Describe the rates of change in the number of buses during the time period. (Table) Year 1980 1985 1990 1995 2000 Number 823 ...
October 31, 2013

chemistry
A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 200 mL of water was placed in the oven and heated. How many photons are required to ...
October 23, 2013

Algebra 1
y=x+1 Domain: -2,-1,0,1,2 what is the range? Is it -1,0,1,2,3
October 23, 2013

chemistry
if 5.2 grams of bismuth react under certain conditions with 10.0 g of oxygen what is the empirical formula of the bismuth formed
October 22, 2013

Geography
I have to write a three paragraph essay on the causes of terrorism. One paragraph for each cause. All I am helping is finding 3 good causes and a little information about how they cause terrorism.
October 20, 2013

chemistry
why is the copper/sulfur mass ratio different from the mole ratio?
October 19, 2013

Physics
How do you find total displacement to and from a place?
October 17, 2013

Newtons Second Law Physics
If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
October 16, 2013

Physics Newtons Law
If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
October 15, 2013

MATH
Which of the following is an irrational number? a. negative square root of 5 B. 1/8 c. 0.3858585... d. negative square root of 64
October 15, 2013

Chemistry
Assuming the gas is ideal, we use the formula ρ = P*MM / RT where ρ = density (g/L) P = pressure (atm) MM = molar mass (g/mol) R = gas constant = 0.0821 L-atm/mol-K T = temperature (K) Note that this formula is just derived from the ideal gas law (PV = nRT). Convert ...
October 15, 2013

vocab
I need help on rootwords im stuck on sepect meaning look I have to find 3 words with sepect in it then put the meaning
October 14, 2013

chem
The reaction is Br2 (g) <---> 2Br (g). It occurs at T = 1600 C. When 1.05 mol Br2 are placed in a 2 Liter flask, 2.50% of Br2 undergoes dissociation. Calculate the Kp for the reaction. Okay so i did the ICE table for this, Br2 (g) <---> 2Br (g) I : 1.05/2 ..... 0 C...
October 14, 2013

Algebra 1
A cyclist can travel 29.6 miles in 2 hours. At this rate, how far can the same cyclist travel in 45 minutes? A: 14.8 B: 22.2 C: 11.1 D: 16.2
October 10, 2013

Algebra 1
A cyclist can travel 29.6 miles in 2 hours. At this rate how many gallons will it need to travel 650 miles. A: 14.8 B: 22.2 C: 11.1 D: 16.2
October 10, 2013

algebra 1
4-10y=22-6x Solve the Equation for y
October 7, 2013

Algebra 1
An architectural firm makes a model of a science center they are building. The ratio of the model to the actual size is 1 in.:85 ft. Estimate the height of the building if the model is 1.5 inches tall.
October 5, 2013

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