Posts by Elena
Total # Posts: 4,391

Science
Match the question with the correct conversion factor needed. Column A 1.What is the mass, in grams, of a single atom of carbon?: 2.What is the mass, in grams, of a single atom of iron?: 3.What is the mass, in grams, of a single molecule of water?: 4.What is the mass, in grams... 
Science
What mass of sodium has the same number of atoms as 50.0 g of calcium? 
Math
One fourth of a watermelon is divided among three friends what fraction of the whole watermelon will each person get 
Physics
KE = W(fr)+PE KE = mv²/2 W(fr) =F •d=?N•d= ?mg•cos?•d PE=mgh=mg•d•sin? mv²/2 = ?mg•cos?•d+ mg•d•sin? d=v²/2g(?•cos?+sin?) = = 6²/2•9.8(0.25•0.241+0.259) = 3.67 m 
math
In triangle wxy, wy is congruent to xy. the perimeter of triangle wxy is 76 inches. how many inches long is wx? 
Algebra 1
Which statement best demonstrates why the following is a nonexample of a polynomial? 33/16  62y^2xz35z^1/3y^2 a. The expression has a variable raised to a negative exponent. b. The expression has a variable in the denominator of a fraction. ** c. The expression has a ... 
Algebra I math
Which statement best demonstrates why the following is a nonexample of a polynomial? 33/16  62y^2xz35z^1/3y^2 a. The expression has a variable raised to a negative exponent. b. The expression has a variable in the denominator of a fraction. c. The expression has a negative ... 
math
40 
Language Arts
Un DER a SPREAD ing chest NUT tree 
Language Arts
Okay, so what I think it is is: UNder A chestNUT tree, but I'm most likely wrong 
Language Arts
Under a spreading chestnut tree which syllables are unstressed? 
Language Arts
Which sentence has correct subject  verb agreement a) casey or robbie are coming to the movies with us b) swimming and skiing is my favorite sports c) sandwhiches or pizza both sounds good for a quick dinner** d) either your brother or his friend is making a lot of noise ... 
Math
15/6 x 7/6 
math
ugh i have the same question.. 
Physics Help!!
1. What is the heat required in kilocalories to convert 2 kg of ice at 0°C completely into steam at 100°C? (I thought it was 2000 kilo cals but I think I'm wrong??) a. 80 Calories b. 1440 Calories c. 4186 Calories d. 540 Calories 2. A gaseous refrigerant undergoes ... 
Trigonometry ??????
If vector a= (10,10) and vector b= (4,5) then a+b ≠ a + b. Explain. I don't understand what this question is exactly asking, and I'm not sure how to answer it. Please explain. Thank you very much!!! 
Chem
How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+ 
Chem
How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+ 
science
Your Friend is correct!! I got 100% Thank you so much Your Friend!! 
physics 1401
The time of the projectile motion is t=2v₀sinα/g sinα=gt/2v₀ =9.8•3/2•300=0.05 α=arcsin0.05=2.8° 
PHYSICS
If ‘v’ is the speed of the bout and ‘u’ is the speed of the stream then 48/(v+u) + 48/(vu) = 14 4/(v+u) = 3/(vu) 48 v =7(v+u) (vu) 4v4u = 3v+3u => v=7u 48•7u = 7(7u+u)(7uu) u=1 km/h 
PHYSICS
5v₁+5v₂=150 25v₁25v₂=150 v₁+v₂=30 v₁v₂=6 v₁=18 m/s v₂ = 12 m/s 
Physics
cesium137: halflife 30.2 years, 0.3 MeV beta and 0.66 MeV gammaray emitter 1 Gray (Gy) = 1 joule of ionizing energy per kilogram Energy = 400 Gy•0.25 kg= 100 J 100J/0.3•10⁶•10⁻¹⁹=3.33•10¹⁵ disintegrations 
science
it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? A) microscopically, chloroplast appear similar to ... 
Statistics
A criminologist is studying school violence, she selects a random sample of 25 adolescents aged 12 to 15 from a local middle school and asks the following,"How many times within the past school year have you been physically assaulted at school? She calculated the ... 
Statistics
Suppose we would like to estimate the mean amount of money spent on books by students in the fall semester. We have the following data from 400 randomly selected students: mean=$205 and s=$40. Assume that the amount spent on books by students is normally distributed. Compute a... 
math
are the following a function 1. y=x/2 my guess is yes 2. y=2x+1 my guess is yes 3.y=x^2 my guess is yes 4.y=mx+b im not sure 
math
Does a machine that takes one quarter at a time into its input and produces one gumball in its output act like a function? my guess is YES 
math
An equation is not a function if even one x value produces ____ corresponding y value(s). one less than one more than one zero for a my guess is more 
math
classify the following number as rational or irrational: 4.1 My guess is Rational 
math
the associative property allows you to change the order of terms in an expression. true or false my guess is True 
math
okay thank you I don't know what an inverse is lol 
math
I don't understand. so is it or is it not a function 
math
Is y=3x^22 a function? my guess is NO 
math
thank you! 
math
Which relationship would most likely have a positive correlation? The amount of memory in computer, and the number of keys on the keyboard. The rate at which a train travels, and the time it takes for it to reach its destination. The number of tickets sold for a baseball game... 
Math
5 
Physics
the charge on a pith ball was measured as +40 nC. if the charge on an electron is 1.6 x 10^19, how many electrons have been added or removed from the ball? 
Chemistry  PLEASE HELP!!!
A 5.0 g n2o (laughing gas) that is inside a 12 mL cylinder used used to fill up a 800 mL whipped cream container. Beforehand, the container had air in it at 760 torr atmosphere pressure at 25 degrees celsius. Then, we will add the n2o/air mix to balloon until the pressure in ... 
math
Does the Commutative Property apply to this situation? I ate dinner and read a book. I got = Yes. 
math
If Jim is twice as old as Jerry plus six, Jerry is three years older than Tom, and Tom is 12, how old is Jim? I got = Jim is 36 
Math
if x7=14 what is the value of x2 Can someone help me with this. I know the answer, I just want to know how something like this is solved. 
earth science
the Julian calendar is the calendar we currently use. True or false. my guess is true 
earth science
one reason the moon might be a better place than earth to study the universe is there is almost no atmosphere. True or False MY guess is false 
earth science
During the summer _________ in India, wet air from the Indian ocean brings heavy rain to India. 
earth science
air pollution in pennsylvania causes ______ in new england because the wind blows the pollution into new England. can someone please help, I cant find this anywhere. 
SCIENCE
The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE 
EARTH SCIENCE
Smog is the worst in.. A. Chicago B. New York C. Los Angles MY GUESS: C. LOS ANGLES 
Earth science
THANKS 
Earth science
TRUE OR FALSE The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE Isobars help meteorologists find fronts on weather maps. MY GUESS: FALSE A CLOUD IS A COLLECTION OF WATER ... 
Geography
Thank you! 
Geography
I have an essay that says.. "It has been said that Eastern Europe is a political region more than a physical region. Would you agree or disagree with this statement? You must provide a solid argument for your position." since it asks me for my opinion how do I write ... 
Math
the average of five numbers is 16. Suppose 10 is added to five numbers. What is the average of the six numbers? 
chemistry
Use activity coefficients to find the concentration of hydrogen ions in a solution of 90.0 mM butanoic acid and 0.05 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 105. Take the size of C3H7COO– to be 500 pm. How do I calculate the ionic strength ... 
math
two students are playing a math game . the object of the game is to make the least possible number by arranging the given digits inside absolute value bars on a card . in the first round , each player will use the digits 3,5,and7 to fill in the card. One student arranges the ... 
Whats this
middle East 
chemistry
4.62kj 
Law
2. http://en.wikipedia.org/wiki/Diversion_program 
physics
Here, u1 = 30 km/h t = 2 s u2 = 33.6 km/h a = (u2 – u1)/t a1 = (33.6 – 30)/2 = 1.8 ms2 Similarly, a2 = (37.2 – 33.6)/2 = 1.8 ms2 The acceleration of the vehicle is 1.8 ms2 
MATH
B. 5/51 
MATH
I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ... 
MATH
I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ... 
business
This site will show you what you need http://www.opengroup.org/public/arch/p4/bus_scen/bus_scen.htm 
algebra
This site shows you how to find terms of the sequence http://www.mathmagic.com/sequences/next_term.htm 
I may fail the 8th grade?
1. Take a deep breath. 2. I may be able to help. 3. post questions on your homework here and either ms.sue will help or me. BTW HELP we wont give you the answers but we will ensure help and explanations and you will get it right 
Biology
A virus is a rudimentary biosystem that has some of the aspects of a living system such as having a genome (genetic code) and the ability to adapt to its environment. A virus, however, cannot acquire and store energy and is therefore not functional outside of its hosts. ... 
biology
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. A prion is an infectious agent composed of protein in a misfolded form. 
Psychology
Read this and find your answer http://www.sirc.org/publik/drinking3.html 
Psychology
What may ultimately make an abnormal behavior into a genuine mental disorder is if the behavior: 1. is maladaptive (harmful to self or others) 2. causes significant social impairment 3. causes significant occupational impairment 4. causes great personal pain and emotional ... 
biology
The basic difference is their components. Viruses contain both nucleic acids (DNA or RNA) and a protein coat. Viruses cause infection by inserting their genetic material in a host cell. The host cell then replicates and reads the genetic material, making new viruses that ... 
Algebra
there are 56 ways 
Algebra
use the 8C3.now, can u evaluate the value of 8C3 ?.nCr = n!/r!(nr)!it is the general formula of combination. also u have know about the "factorial", like 3! = 3 * 2 * 1 = 6 8C3, in this case knowed n=8 and r=3. by using the formula above, it can be 8C3 = 8!/3!(83... 
Measurment
To answer this question, you'll need to find the surface area of the top of the container (which is a circle), along with the surface area of the side of the container.Note that the diameter of the container is given and is 6 inches; therefore, the radius is ... what? Note... 
english
I think its either A. or C. but im not sure. Maybe A 
english
In "A Man Called Horse," After his wife leaves him, Yellow Robe Behaves recklessly in battle because he A. would rather die than live with the bitterness he feels as a result of his lost pride B. is trying to gain membership in the society known as the foxes C. ... 
english
I think its D 
english
writers portray the personalities of characters A. only through revealing the characters private thoughts. B. through plot complication. C. only if the plot is not important to the story. D. through a variety of methods. 
7 grade math
Thank you @Bobpursley!! 
7 grade math
Consider two types of nonlinear equations. What unique quality does each possess and how does that quality cause the graph's unique shape? Name two unique examples of these shapes in realworld situations. 
URGENT Physics help
F=kq₁q₂/r² q₂= F r²/kq₁= 7.2•10⁻²/9•10⁹•4•10⁻⁶= =2•10⁻⁶ C = 2μC Cpper rod is an electrical conductor; the others are insulators. 
Physics
C=q/Δφ q=C Δφ 
engineering
In the question I have some strenths and w/c ratios of some specimens and it is asking me about the range,molds?Also,How many specimens should be taken for each batch of concrete? This is a question before we learn it,so really have some understanding problems. 
engineering
Hello guys.I got a homework and seem like I am stocked. a)What type of experiments should be done to find the relationship between the strength of concrete and water/cement ratio. b)what will be the range of the water/cement ratio? It would be great if you help.Thank you! 
Math
To Damon: thank you so much for your help :)))))) 
Math
To Steve: I just copy that from my child's textbook as it is. Thank you for your great advice, I'll forward it to his math teacher. 
Math
Hector has $450 and saves 20 per week. Tim has $1200and spends $30 per week.write a system equation for this situation 
Physics 194
d•sinφ=kλ, tanφ=x/L. => d•x/L=kλ λ₁=dx₁/Lk λ₂=dx₂/Lk λ₁/λ₂=dx₁Lk/dx₂Lk= x₁/x₂ λ₂=λ₁x₂/x₁=630•0.21/0.26=508 nm 
Physics
bsinφ=k λ sinφ=kλ/b, a) sinφ=1•630•10⁻⁹/0.020•10⁻³=0.0315 φ=1.8° b) sinφ=1•630•10⁻⁹/0.20•10⁻³=0.0035 φ=0.18° c) sinφ=1•630•10⁻⁹... 
physics
a=ω²R, F(fr)=μN=μmg, ma =F(fr) => mω²R₁= μmg m(2ω)²R₂=μmg ω²R₁=4ω²R₂ R₂=R₁/4 
Physics
E=0 
physics
Imagine that F₂ is along the xaxis, F is along yaxis, and F₁ is directed to the “northwest”. The angle between F and F₁ is α. sin α = F₂/ F₁=1/2 α=30° Thus, the angle between F₁ and F₂ is 90°+30°... 
Physics
W=mg 
physics
1/λ₁ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/1²) –(1/3²)] λ₁=2.56•10⁻⁸ m 1/λ₂ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/2²) –(1/... 
physics
E=5eV=8•10⁻¹⁹ J λ=h/p = h/sqrt(2mE) = =6.63•10⁻³⁴/sqrt(2•9.1•10⁻³¹•8•10⁻¹⁹)=5.5•10⁻¹⁰ m 
physics
S=Energy per unit time/Area = Nhf/A= =4Nhc/πD²λ= =4•1.42•10¹⁸•6.63•10⁻³⁴•3•10⁸/π•(1.82•10⁻³)²•524•10⁻⁹= =2.07•10⁵ W/m² Electric ... 
physics
(a) 1/do+1/di =1/F 1/di=1/F1/do=1/48.5•10⁻³ 1/3.85•10⁸. di≃48.5•10⁻³m x/di=D/do x=D•di/do =3.48•10⁶•48.5•10⁻³/3.85•10⁸.= =4.38•10⁻⁴ m (b) 1/do₁+1/di₁... 
physics
tan(α/2) =x/L => x=L tan(α/2) Coordinate of the second dark fringe is x=(2k+1)Lλ/d L tan(α/2)= (2k+1)Lλ/d d/λ =(2k+1)/tan(α/2)= (2•2+1)/tan3.6°=79.5 
Physics
(i) h=gt²/2 t=sqrt(2h/g)=sqrt(2•10000/9.8)=45.2 s. (ii) v=800000/3600 = 222.2 m/s s=vt =222.2•45.2 =10044 m (iii) x=0 (since the horizontal speed of the cargo is constant) 
Physics
The speed of sound at 20°C v=343 m/s s=vt=343•3=1029 m 
Physics
If the detector (radar)is at rest and the source (moving car that reflects the sound)) is moving away from the detector, the observed frequency f is less than the actual frequency f₀. The speed of sound v =343 m/s f=f₀v/(v+V) V=v(f₀f)/f =343•(1.51.4)&#...