Wednesday

September 2, 2015
Total # Posts: 251

**physics**

why is work done during the rise= mgh directly?
*December 1, 2012*

**physics**

(a) a spherically shaped buoy is made from wood, which has a specific gravity of 0.6. find the acceleration of the buoy when released from rest at the bottom of a freshwater lake. (b) if the buoy starts out 10 m below the surface of the water, determine the height above the ...
*December 1, 2012*

**chemistry**

If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?
*October 31, 2012*

**chemistry**

A sample of natural gas is 85.2% methane, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this gas mixture at 18.0°C and 771 mmHg? Assume ideal gas behavior.
*October 31, 2012*

**math**

E4EW45WE45W4
*October 15, 2012*

**mathematics of finance**

solve; FV=7,000;i=0.03;PMT=$400;n=?
*September 24, 2012*

**algebra**

what is the answer of 7h+2w-9h-8w
*September 23, 2012*

**social studies**

ethnic group
*September 10, 2012*

**college physics**

Answer pls
*August 18, 2012*

**chem**

.144
*May 15, 2012*

**Math**

A student wants to display the average monthly temperatre for one year.He chooses a line graph to display the data.Describe and correct the error made in choosing that type of display for the data.
*March 29, 2012*

**Math**

Which sample is more likely to be biased? Should big bend state park restrict the number of campers allowed on the grounds? a.70 randomly selected visitors to Big Bend State Park b.70 randomly selected campers at Yosemite National Park
*March 27, 2012*

**Math**

Should the city build a homeless shelter downtown?Which sample is more likely to be biased? a.60 randomly selected downtown resturant customers b.60 randomly selected people at the post office
*March 27, 2012*

**Math-Corrections**

I'm not sure ,but now i got the answer no because she(the librarian)cant prove that the kids will not like the new encyclopedia.
*March 27, 2012*

**Math-Corrections**

Based on the survey,the librarian predicts that about two-thirds of the students in seventh grade will not like the new encyclopedia.Is this answer reasonable? Answer i got:yes
*March 27, 2012*

**meanings**

Musical?
*March 27, 2012*

**Chemistry**

What is the complete chemical equation? Al(s) + Cu(CH3COO)2(aq) -> ?
*March 18, 2012*

**Math help quickly**

Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above and i = 0 on the bottom...
*March 13, 2012*

**Calculus need help badllyyy!**

Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above and i = 0 on the bottom...
*March 13, 2012*

**4th grade math**

what is 5/6 of 288
*March 12, 2012*

**4th grade math**

what is 5/6 of 288
*March 12, 2012*

**Chemistry**

What is the magnitude of the energy change associated with the emission of one mole of photons of light* with this wavelength? light*= 6.231×1014 Hz
*March 3, 2012*

**MATH**

2+2+1+1=6cm2
*February 29, 2012*

**Chemistry**

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 10-4 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 10-3 M/atm
*February 7, 2012*

**Chemistry**

Find the product for the equation and then write a balanced equation. Cl2 + FeBr3 -> ?
*January 15, 2012*

**chemistry**

I need to convert a word problem that I was given into a balanced chemical equation and cannot figure out how i was type it. The problem is: Nitrogen and hydrogen gases react at extreme temperatures and pressures. Any help?
*January 8, 2012*

**math**

Puck is making a scale model of an airplane. The actual airplane is 98 feet long. The scale of the model is 1 cm : 4.7 ft. What is the length of the model? [Round to the nearest hundredth, if necessary.]
*January 4, 2012*

**Chemistry**

In respect to covalent bonding, what does it mean if there's an unshared or lone pair of electrons?
*December 31, 2011*

**Science**

A circular hatch in the hull of a submarine has a radius of 40.0 cm. The submarine is 850.0 m under water. If atmospheric pressure above the ocean is 1.01 x 105 Pa and the air pressure inside the submarine is 1.31x 105 Pa, what net force is exerted on the hatch? (ρsw = ...
*December 19, 2011*

**chemistry**

A gaseous mixture containing 5 moles of H2 and 7 moles of Br2 reacts to form HBr. Write a balanced chemical equation. Which reactant is limiting? What is the theoretical yield in moles? What is the theoretical yield for this reaction in grams? How many moles of excess reactant...
*December 4, 2011*

**calculus**

i'm not sure how to do this. can someone help, please? thanks! consider the function f(x0 = x^2 + 2x on the interval [-2, 2] a. draw a sketch of the graph of f(x). find the average rate of change on the interval [-2, 2] and sketch this secant line. b. find an expression ...
*November 27, 2011*

**English**

essay "peace and stability in a globalized world" I need some help. Thanks
*November 25, 2011*

**Math**

Typing error fing meaning find
*November 15, 2011*

**Math**

How do I fing volume of a shape?
*November 15, 2011*

**calculus**

let f(t) = 2*pi*t + sin(2*pi*t) a) find value of t in open interval (0,2) for which the tangent line at (t, f(t)) is parallel to the line through (0,0( and (2, 4pi) b) suppose the given funtion describes the position of a particle on the x-axis for 0<= t <= 2. What is ...
*November 1, 2011*

**calculus**

find the centroid of the plane region bounded by the curves y = cos x, y=sinx, x=0,
*October 31, 2011*

**English**

I need to know what just means in the following Sentance . Do you think this is just Please help even my mom is blank Tx
*October 28, 2011*

**pre algebra with pizzazz 239**

X+y=2
*October 27, 2011*

**English**

I'm blank on this question From the verbs listed write a noun ending in ion Divide Explode. Collide Confess. Invade. Rotate Comprehend. Deflect I don't need all the answers I just need to know what it means Thanks
*October 27, 2011*

**Non verbal reasoning age 9-10**

I really hate nvr it's horrible. I'm English so we have to do this I don't know if any Americans do it but I still hate it. For anyone who docent know what it is, it's basically pictures that mean something , but get changed ur ment to circle the answer . Any ...
*October 27, 2011*

**Fourth grade math**

Tx fo helping
*October 27, 2011*

**Fourth grade math**

What's range mean?
*October 27, 2011*

**English**

For our homework we had to draw and label an imaginary creature, then write an essay on it . I'm completely stuck on the essay bit please he
*October 27, 2011*

**English**

What word is wrong in this sentence ? Darren wusai and I is a good team. Please help I need this in in about six hours time!
*October 27, 2011*

**English**

Wow ! I thought it wasn't that simple as of being an opposite thanks I'm saved!
*October 27, 2011*

**English**

Really stuck on English homework.ahhhh! What is an antonym for the following words? Subtract Extend Spectator Least Confident Exterior Please, help despretly needed by Monday !
*October 27, 2011*

**english**

I'm not sue but I would put who because it's a simpler word
*October 26, 2011*

**English check my answer**

I'd just say I'm really bad at grammar and tell your teacher , can I have some extra help please? Sweet talking into thinking you love English always works
*October 26, 2011*

**Social Studes**

Hhhhhheeeeeellllllppppppppp mmmmmmeeeeeee oooooooonnnnnnn this
*October 18, 2011*

** Math**

I am a number with the same number of tens as ones. The sum of my digits is less than 5. Is am a number greater than 15. What number am i?
*September 29, 2011*

**4th grade Math Help**

hi, what is the least possible number, when rounded will become 1,000,000? would it be 999,999?
*September 19, 2011*

**calculus**

fin derivative of the function (t+e^t)(4- sqrt t)
*June 26, 2011*

**calculus**

differentiate the following funcation: R(t) = (t + e^t)(4- sqrt (t))
*June 26, 2011*

**calculus**

f(x)= (4x^2+5)/(3-2x) find derivative using limit
*June 23, 2011*

**calculus**

given the function f(x) = { x^2+2 if X<=2, 3 if x=2 and 4-x if x>= 2 -> graph f(x)
*June 22, 2011*

**math**

how do you do 16n-9 with the specials
*May 16, 2011*

**Physics**

A projectile is launched beneath the straight line path it would follow if there was no gravity. How many metres does it fall below the line if it has been travelling for 1 second? 2 seconds?
*May 14, 2011*

**Calculus**

Write the logarithm of a single quantity: 2ln(x)+ln(4)-(1/2)ln(9)
*April 6, 2011*

**math (plz help)**

1. 46 seats...... 30+4+4+4+4 2. No the 8th row has 62 seats and the 7th row has 58 (30+4+4+4+4+4+4+4+4) 3.THeater B has 145 seats.... (40+25 4's) hope that helped
*March 14, 2011*

**chemistry.**

i've tried to di it. 1)Na2CO3 + HCl---> NaCl+NaHCO3 2)Basic as Na2CO3 is a base and amount of HCl =0 3)NaHCO3+HCl--->NaCl+CO2+H2O 4)phenolphthalein for eq pint point 1 as it will indicate change in basicity and methyl orange for secong equivalnce point as it will ...
*March 13, 2011*

**chemistry.**

in the titration between Na2CO3 and HCl... 1) at the first end point what reaction is stoiciometrically complete? 2)At the start of titration where HCl=0 is the solution acidic or basic. ExPlain? 3) At the 2nd end point what reaction is stiociometrically complete? 4)Propose a ...
*March 13, 2011*

**chemistry urgent**

Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile
*March 7, 2011*

**Organic chemistry**

Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile?
*March 6, 2011*

**science**

anyone gonna help?
*February 13, 2011*

**science**

I'm in 5th grade and I need a cool, unusual science fair project. I have 3 days to do this. It has to be a question with a variable, not a demonstration. HELP!
*February 13, 2011*

**banyan elementary**

7x12=84
*January 19, 2011*

**space**

How many socks would it take to fill the space shuttle
*January 9, 2011*

**biology**

21% of a population is homozygous dominant, 49% are heterozygous and 29% are homozygous recessive. if the Hardy-Weinberg Law applies, what percentage of the next generation is predicted to be homozygous recessive?
*January 4, 2011*

**math**

How do you find the unit rate for this? The managerof Quality Dairy stores says it takes 1000 pounds of milk to make 100 pounds of cheddar cheese. Find a unit rate relating pounds of milk (m) to pounds of cheese (c). 1000 pounds of milk per 100 pounds of cheese.
*November 29, 2010*

**math**

find the values of x and y that solve the system of equations -3 x- 8y=19 4x+9y=-22
*November 29, 2010*

**5th grade**

adverb?
*November 19, 2010*

**physics**

crate weighs 823 N rests on plank that makes a 25 degree angle with the ground. Find components of crate's weight parallel and perpendicular to the plank
*November 18, 2010*

**Math**

1. -3/4*-(1 5/6)*(-7/4)= 2. -3/4*(-1 5/6)*7/4= 3. -3/4*(-1 5/6)*(-7/4)*(-2 3/8)= 4. 3/4*(- 5/6)*7/4*(-2 3/8)= 5. 3/4*1 5/6*7/4*(-2 3/8)=
*October 25, 2010*

**Math**

Info Sean is buying a new DVD player for 315. the store offers him an interest-free payment plan that allows him to pay in monthly installments of $25. Ques. Use n to stand for number of payments and a for the amount still owed. Write an equation for calculating a for any ...
*September 21, 2010*

**Human services**

what are the pros and cons of placing children of color in a causian home?
*May 10, 2010*

**chemistry**

consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?
*April 26, 2010*

**Economics**

Quality Adjusted Life Years evaluates interventions in _____ rather than _____. a. dollars; years b. utility; dollars c. years; dollars d. dollars; utility
*April 19, 2010*

**Chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.
*April 16, 2010*

**Chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.
*April 16, 2010*

**Chemistry**

oh i think you have to convert the mm Hg to atm first
*April 16, 2010*

**Chemistry**

dont you just multiply .038 times the total pressure?
*April 16, 2010*

**Chemistry**

okay yeah i got it. thanks its 736 mmhg
*April 16, 2010*

**Chemistry**

how do i know the water vapor pressure at 25C though?
*April 16, 2010*

**Chemistry**

The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 C and a total pressure of 760 torr . what is the partial pressure of the gas?
*April 16, 2010*

**Advanced 6th grade Math**

i still dont get it
*April 12, 2010*

**Advanced 6th grade Math**

What is the sample space of expiremental probibility
*April 12, 2010*

**art 101**

it is a
*April 12, 2010*

**6th Grade Grammar**

yeah definitly a
*March 17, 2010*

**CRT205**

(I did not get some answers correct on this categorizing fallacies assignment. It was graded but not with the correct answers. Can someone help me by telling me which type of fallacies the below statements are please so I can understand better. Thank you!) 1.My friend, who ...
*March 8, 2010*

**2nd grade**

Why is it helpful for scientists to know how long animals can live?
*March 1, 2010*

**Molecular biology**

What is the importance of the tertiary structure of a tRNA? I know the structure, but I'm not sure what is the importance of it. Is it stabilization?
*February 24, 2010*

**Algebra**

2(x+5)/(x+5)(x-2) = 3(x-2)/(x-2)(x+5) + 10/(x+5)(x-2) I know I have to get 2(x+5) = 3(x-2) but I don't know the intermediate steps. I tried canceling out to get 2/(x-2) = 3 + 10 / (x+5) and gross multiplying but that wouldn't make sense.
*February 24, 2010*

**Physics**

Oh picture looks like this 4q----a----q | | | | a a | | | | 5q----a----5q
*February 1, 2010*

**Physics**

Four charged particles are at the corners of a square of side a, as shown in the figure below. (A = 4, B = 5, C = 5.) (a) Determine the magnitude and direction of the electric field at the location of charge q. (Use k_e for the Coulomb constant and q and a as necessary.) ...
*February 1, 2010*

**Physics**

A proton accelerates from rest in a uniform electric field of 620 N/C. At one later moment, its speed is 1.30 Mm/s (nonrelativistic because v is much less than the speed of light). (a) Find the acceleration of the proton. m/s2 (b) Over what time interval does the proton reach ...
*February 1, 2010*

**Biology**

I don't understand how to do this at all!! I've been Googling the past hour and I just don't get it. My teacher won't respond and my exam is tomorrow. I get that we cleave with an acid and then we can do amino acid analysis. The entire protein can be pieced ...
*January 27, 2010*

**home economics**

name two macronutrients and two micronutrients
*January 14, 2010*

**Physics**

By what factor would you have to decrease the tension in a stretched string in order to decrease the wave speed by a factor of 3.5? I know that v = sqrt(T/u) but am confused as to what to do?
*January 11, 2010*

**Physics**

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed? I got: v2 +ω^2x^2 =ω^2A^2 vmax =ω A and v = ωA/2?
*January 4, 2010*

**Physics**

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed?
*January 4, 2010*