Tuesday

May 3, 2016
Total # Posts: 3,326

**chem**

Po-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 69 mg of Po-218, how many alpha emissions would occur in 6.0 minutes? the answer has to be _________a emmisions (which I have no idea what it means) and I use a chart thing with amount, #H-L, and ...
*October 5, 2010*

**Chemistry**

Draw the lowest energy conformation of 3-ethyl-2,4,4-trimethylheptane, depicting the C3-C4 bond on a sawhorse. How would i do this? i am so lost
*October 5, 2010*

**geometry**

fine the perimeter of ABCD = 46. AB = x+9, CD= 2x-7
*October 4, 2010*

**math**

what does equivalent mean?
*October 4, 2010*

**8th grade math**

I understand that part but I'm just not sure when the question asks me what VALUE will make the equation TRUE will it be x=-72? because I don't think that's what there asking me.
*October 4, 2010*

**English composition**

Music during slavery: A call to arms or a panacea?
*October 3, 2010*

**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*