Monday
October 20, 2014

Posts by Lisa


Total # Posts: 3,015

chem
Write a partial decay series for Rn-220 undergoing the following sequential decays: á (alpha decay), á, â(beta decay), á. (Enter the mass number in the first raised box, the atomic number in the second lower box and the symbol of the element in the ...
September 30, 2010

Math
Im pretty sure you could use the pythagorean theorem a^2 + b^2 = c^2 just plug in the numbers you have and solve for c
September 30, 2010

spanish
Im not quite sure what your asking do you mean something like tus companeros de clase?
September 30, 2010

math
median=90 you find the median by putting all the numbers in order and finding the middle number
September 30, 2010

math
47 rounded to the ten's place is 50
September 30, 2010

chemistry
oops b and c should be b decay and in the directions its a,b,a,b
September 30, 2010

chemistry
Write a partial decay series for Po-214 undergoing the following sequential decays: á, â, á, â. Use e for an electron. Use the format +1 or -1 for charge. a)a decay b)â decay c)a decay d)â decay
September 30, 2010

chem
(b) If the natural abundance of Ag-107 is 51.84%, what is the natural abundance of Ag-109? 48.16 % (c) If the mass of Ag-107 is 106.905, what is the mass of Ag-109? 108.9 amu so i got the answers correct but kinda forgot how because it took me a while so do you think you could...
September 29, 2010

11th grade
sound travels at 350 m/s in warm air. "If you hear the echo in 10 seconds, how far away is the reflecting surface?
September 28, 2010

science, density
The density of sea water is slightly higher than that of fresh water. The higher density is due to the fact that sea water contains salts such as sodium chloride and magnesium chloride. Suppose you have a container that holds 5.00 kg of fresh water, which has a density of 1.00...
September 28, 2010

Math
how do I solve this problem. In 1920 the record for a certain race was 445.7 sec. In 1970, it was 44.2 sec. Let R(t) = the record in the race and t = the number of years since 1920. a) Find a linear function that fits the data R(t) = b) What is the predicted record for 2003? c...
September 26, 2010

The Young Child and the Environment
When a child not only throws a ball farther than she had previously, but also changes the way the throws the ball, the change is called A. Cumulative B. Multifactoral C. Quantitative D. Qualitative
September 23, 2010

Chemistry
A sample of gas occupies 3.00 L at 760 torr. Calculate the volume it will occupy at 1.45 atm and the same temperature?
September 23, 2010

Chemistry
A balloon filled with helium has a volume of 1.oo x 10^3 L at 20 degrees c. What will be the balloons volume at 30 degrees c, if the pressure surrounding the balloon remains constant?
September 23, 2010

sport
If air resistance is negligible what would the flight path of a shot from the moment of release to the moment immediately prior to landing look like using newtons 3rd law of motion?
September 22, 2010

sport
Can you name and explain 3 factors (excluding air effects ) which should be utilised by a shot putter to optimise the distance thrown using newtons trird law of motion
September 22, 2010

Sport
Why is the flight path of a shot putt different to that of a badminton shuttle using newtons third law of motion?
September 22, 2010

sport
How do i explain the effect of air resistance on the flight of two badminton shuttles, the first of which has been struck hard (with a greater application of force) and the second which has ben struck gently?
September 22, 2010

Sport
How do I explain using Newtons 3rd Law the nature of the reaction force which provides impulsion for a cyclist?
September 22, 2010

Physics
Bobpursley -- I do not understand. The answer was 5.7 s and I have no idea what equation was used to get that.
September 21, 2010

Physics
Can someone help me to understand how to work out this problem? The pilot of an airplane traveling 240 km/h wants to drop supplies to flood victims isolated on a patch of land 160 m below. The supplies should be dropped how many seconds before the plane is directly overhead?
September 21, 2010

5th grade
What is subject and verb of this sentence...The rest of story was never told.
September 20, 2010

english
What is the subject a d verb of this sentence...The rest of the story was never told.
September 20, 2010

math
Three different pairs of numbers that add together to get 1
September 20, 2010

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. i tried to solve it on...
September 16, 2010

molal (again)
im not sure about the last step tho... i know the final answer is -120.0 but im not sure how to get to that...
September 15, 2010

molal (again)
i tried to solve it on my own but im confused about the last part, this i what i have so far.. moles of glycerin= 50.0/92.10=0.54 molality=0.54/0.200=2.7 is that right? im a little confused about the numbers im supposed to use for step 3... this was the question: the freezing ...
September 15, 2010

Chemistry
a car is traveling at a rate of 41.2 megameters/hr. what is the rate in cm/s?
September 15, 2010

Physics
An airplane flies 200 km due west from city A to city B and then 345 km in the direction of 32.0° north of west from city B to city C In straight-line distance, how far is city C from city A?
September 14, 2010

8th grade math
thanks
September 14, 2010

8th grade math
I need the equation for these numbers: 3, 9, 19, 33, 51 I see that the pattern goes up by 6, then 10, then 14, then 18 (4 more each time)
September 14, 2010

molal
Thank you for the help, i really appreciate it.
September 14, 2010

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 14, 2010

molal
i tried to solve it on my own but im confused about the last part, this i what i have so far.. moles of glycerin= 50.0/92.10=0.54 molality=0.54/0.200=2.7 is that right? im a little confused about the numbers im supposed to use for step 3...
September 13, 2010

molal
thank you looks like i double posted... sorry
September 13, 2010

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 13, 2010

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 13, 2010

college math
Given the situation described, identify the type of sampling involved. A parish in Louisiana is divided geographically into school districts. A random sample from each of the school districts is selected
September 11, 2010

english
Their are three kids in the room.
September 11, 2010

english
Sentence Correction and Changes in Writing
September 11, 2010

chemistry
density of 8.48 g/cm3 volume of 114.5 cm3 of brass
September 10, 2010

chemistry
Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 . A fitting composed of common brass has a total volume of 114.5 .How many atoms of copper does the fitting contain?
September 10, 2010

MATHS----Matrix
For a given square matrix A the predicted values of matrix B are: predicted B=A(A'A)^(-1)A'B why is the matrix C=A(A'A)^(-1)A' an idempotent and symmetric matrix? and is this matrix invertible?
September 8, 2010

math
Simplify. Your answer should contain only positive exponents. (when a number is between *__* its an exponent) 5y*-5* - ------- -u*5* v*-4* .(times) -uv*5* sorry if this is a bit confusing (hard to write this on a computer)
September 7, 2010

Statistics
20 percent of the interval
September 7, 2010

Physics
The diameter of some celestial body is 3080 km. What is the volume of this body? _____m3 How many of these celestial bodies would be needed to create a volume equal to that of Earth? The radius of the Earth is 6.38 106 m.
September 7, 2010

physics
The diameter of some celestial body is 3080 km. What is the volume of this body? _____m3 How many of these celestial bodies would be needed to create a volume equal to that of Earth? The radius of the Earth is 6.38 106 m.
September 6, 2010

eth/125
·Write a 700- to 1,050-word essay in which you answer the following questions: Conduct research to determine if the ethnic group colonized or if it immigrated to the United States. What country did they originate from and why did they enter the U. S.? Did the group face...
September 4, 2010

physics
A charge of -3.35 nC and a charge of -7.00 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.10 nC can be placed so that the net electrostatic force on it is zero.
September 3, 2010

math
If a vehicle gets 16 MPG and gas costs $2.70/gallon. How much would it cost to drive the vehicle 30 miles? Can someone help me find a formula to figure this out?
September 2, 2010

psychology
I was asked to define independant and dependant variables without defing, but buy using an example...would this be one...two digging dogs, one never corrected for digging(IV) and one corrected by a loud noise(DV), or would that be classical conditioning?
August 30, 2010

4th grade
Independent and dependent variables are related to one another. The Independent part is what you, the experimenter, changes or enacts in order to do your experiment. The dependent variable is what changes when the independent variable changes - the dependent variable depends ...
August 30, 2010

earth science
how do members of the biosphere affect the geosphere?
August 29, 2010

Human service
When is it inappropriate to share a hunch?
August 27, 2010

us history
compare nixion's policies of engagement with foreign policy strategies used during the cold war
August 20, 2010

statistics
The mean weekly earnings of all male workers in a state is $775 and the mean weekly earnings of all female workers in the same state is $658. Suppose we select one sample of 400 male workers and another sample of 300 female workers from this state. What is the mean of the ...
August 16, 2010

Paine College
okay, any step in the right direction would help
August 10, 2010

Paine College
Morningside Nursing Home, a not-for-profit corporation, is estimating its corporate cost of capital. Its tax-exempt debt currently requries an interst rate of 6.2 percent and its target capital structure calls for 60 percent debt fianancing and 40 percent equity (fund capital...
August 10, 2010

grant writing
I'm writing a grant proposal and I'm not sure how to include an appendix. Is it just an outline of the information that was included in the proposal?
August 9, 2010

english
I'm not sure how to write an appendix for a project that I'm working on. Can anyone give me some guidance?
August 9, 2010

physic
component with a 17 Ù resistor is rated for use at power levels not exceeding 14W. How much current can safely flow through the component?
August 4, 2010

math
an irrational number greater than one but less that two ?
August 3, 2010

AP Physics
The question states itself, "what was the distance traveled?", thanks for answering though.
August 1, 2010

AP Physics
Yes, this is AP physics. :) Thanks Ms. Sue!
August 1, 2010

AP Physics
the radius of a circle is 5.5cm, what is the circumference in meters?
August 1, 2010

AP Physics
(1.33)sin25.0=(1.50)sinO
August 1, 2010

AP Physics
qV=1/2mv^2, solve for the variable v
August 1, 2010

AP Physics
I am ready for college level work. As a matter of fact, I have been taking AP classes for two years. So please answer the question or don't post at all. Thank-you. -Lisa.
August 1, 2010

AP Physics
mgh=1/2mv^2, solve for the variable v
August 1, 2010

AP Physics
K=1/2kx^2 solve for the variable x
August 1, 2010

AP Physics
K=1/2(6.6 x 10^2 kg)(2.11 x 10^4 m/s)^2
August 1, 2010

AP Biology
The type of learning that is involved in predator/prey interactions where an alteration in behavior is a response to stimulus is called...? -Habituation Learning? -Cognitive Learning? -Instinctive Learning? -Associative Learning? -Non-associative Learning?
August 1, 2010

AP Biology
What is not dependent on sunlight as a source of energy? -Benthic Zone? -Pelagic Zone? -Neritic Zone? -Taiga? -Tundra?
August 1, 2010

Biology
You're right! I just entered it into the multiple choice box and it told me I was correct. Thank-you, thank-you, thank-you!
August 1, 2010

Biology
Well, it seems to inch more near the 60 degrees, but I will take your word for it.
August 1, 2010

Biology
Is that certain, Ms. Sue?
August 1, 2010

Biology
The choices are: -90 degrees -15 degrees -60 degrees -0 degrees -30 degrees
August 1, 2010

Biology
The great deserts and associated arid areas of world mostly lie along the western sides of the continents at about how many degrees north or south latitude?
August 1, 2010

english
its wrong
July 28, 2010

speech english
what will continue to make Othello worthy of critical study? through a critical evaluation and reflection of othello, analysing the construction, content and language of the text??? theres has to be readings suchs as poost modernist, modernist, femist or post colonial ...
July 23, 2010

physic
A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down. Case C: Thrown out at an angle of 45° above ...
July 21, 2010

physic
a pipe is 40% blocked the water is coming into the region is moving at 8.5cm/s just before the blocked segment of pipe. What is the speed of the water as it goes through the partially blocked segment? By how many pascals does the pressure in the blocked segment decrease ...
July 20, 2010

pharmacy
A drug is dosed at 100mg/kg/day. The patient weighs 81.64 kg. What is total dose needed?
July 20, 2010

medicine
What is final concentration of a mixed solution combining 50ml of 20% solution, 150 ml of a 15% solution and 200 ml of a 35% solution?
July 20, 2010

accounting for health care environment
Assume you are the financial director of a clinic that is a part of an organization named Getwell Clinics Incorporated. Your clinic—named after you—serves a suburban community with a population of about 24,000, of which 25% are expected to become patients of the ...
July 20, 2010

biology
What are some of the benefits of squeezing so much data into virtually every cell in the body?
July 13, 2010

simple interest rate
Need simple interest rate (rounded to hundreths) on a loan of $3500 which in two months the maturity value was $3583. What is the formula to figure this problem?
July 6, 2010

algebra
If Joseph decided that he wanted to have $300,000 accumulated in 30 years by making an annual payment at the end of each year that would earn 12% compounded annually, what would his sinking fund payment be? Use appropriate table to determine the answer.
July 5, 2010

Math
In 1990 the life expectancy of males in a certain country was 70.9 years. In 1994, it was 73.5 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990. The liner function E(t) that fits the data is E(t)= _t+_ . Round to the ...
July 4, 2010

trig
evaluate the trigonometry function using its period as an aid cos(-7pi/3)
July 3, 2010

math
After looking at the results of her calculations, Naomi has decided to aim for $500,000 savings by the time she retires. She expects to have a starting salary after college of $25,000 to $35,000 and she has taken into acount all of the living expenses that will come out of her...
July 3, 2010

science
why do you think controlling greenhouse gases is such a difficult problem ? List some of the technological, economic, political, and other factors involved. Whose responsiblity is it to reduce our impacts on climate ?
July 2, 2010

college Algebra
Thank-you
July 1, 2010

college Algebra
Diameter of a circle.If the diameter of a circle is 1.3x10^-12 meters,then what is it's radius?
July 1, 2010

college algebra
Thank-you Jen
July 1, 2010

math
x+3=-(2x+2)
June 30, 2010

quality management
what type of similar proceedures from Southwest airlines and Lufthansa would be effected their competition in the global and local market? I am starting a paer "the effects of quality management on domestic and global competition. When I look up the airlines websites, ...
June 26, 2010

Equation
-4x (little 2) =0 Not sure what name the technique means. I know this is a Quadratic Equation.
June 19, 2010

Linear
3x/4 + 6= -12 I know this is a linear equation but how solve it and what technique??
June 18, 2010

Physics
An airplane has a mass of 33,000 kg and takes off under the influence of a constant net force of 38,000 N. What is the net force that acts on the plane's 71 kg pilot?
June 16, 2010

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