Thursday
May 26, 2016

Posts by Sarah

Total # Posts: 5,423

physics
Assume the truck is going at v0 = 25 m/s, and you're 20 m behind the truck. You decide to accelerate at a = 1.0 m/s2 to pass the truck. To pass safely, you also want to pass the truck by 20 m before moving back to the lane. Part A ) Estimate the time interval needed to ...
January 13, 2016

Physics
Thank you so much!!!
January 13, 2016

Physics
what would I solve for when I do the conservation of momentum at the bottom of the block with the bullet?
January 13, 2016

Physics
A 0.15kg bullet is fired into a 1.85kg block that is hanging from a 45cm string. What minimum initial bullet speed is required if the bullet and block are to make one complete revolution? Please show all work. I need this question answered as soon as possible!
January 13, 2016

physics
A ball is thrown up onto a roof, landing 4 sec later at height of 20m above the release level. The balls path just before landing is angled at 60 degree with the roof. a) find the horizontal distance d it travels. b) what is the magnitude of the balls initial velocity? c) what...
January 12, 2016

Math
describe a situation where a trend line would be useful
January 12, 2016

math help please
48/3 = 16 2/3= 16x2= 32 she sold 32 muffins
January 12, 2016

Math
log2(-3sinx)=2log2(cosx)+1 solve for x
January 12, 2016

Chemistry
Compound X contains only carbon, hydrogen, nitrogen, and chlorine. When 1.00 g of X is dissolved in water and allowed to react with excess silver nitrate, AgNO3, all the chlorine in X reacts and 1.95 g of solid AgCl is formed. When 1.00 g of X undergoes complete combustion, 0....
January 6, 2016

math
Roma spent 30% of the money she bought to the mall..If she spent 450.00 only,how much did she have with her when she went to the mall?
January 6, 2016

math
after spending 80% of her money Lei has P100.00 left. How much was her money before
January 5, 2016

science
Suppose the height of the net is 0.800 m , and the court's border is 11.2 m from the bottom of the net. Use g =10 m/s2 and find the maximum speed of the horizontally moving ball clearing the net..
December 16, 2015

Math
A contractor buys 14 yd of nylon carpet and 20 yd of wool carpet for $1738. A second purchase, at the same prices, includes 16 yd of nylon carpet and 25 yd of wool carpet for $2102. Find the cost per yard of the wool carpet.
December 13, 2015

pobability
Suppose that 16% of the CD's that are distributed are defective. If you choose 5 CD's randomly, what is the probability that at least 1 of them is defective?
December 11, 2015

Math
How do integrate this with respect to x? integral of ((x^y)/y!)e^(-2x) from 0 to infinity The e is an exponential. The answer is supposed to be (1/2)^(y+1) but I don't know the steps to getting it.
December 10, 2015

math
Measuring number of surface of the rectangle is 128.If we reduce the length of 4 times, then the number is 96cm2.What is the perimeter?
December 10, 2015

geometry
c//d,<7 and< are= corresponding angles
December 9, 2015

Chemistry
Nevermind - I think I see what I did wrong. I was using 25 mL as my volume for hydrogen peroxide, when I should have been using 20 mL since that was the volume being added. Though I don't necessarily understand how that's the volume that needs to be used.
December 9, 2015

Chemistry
a 5.000ml aqueous sample containing hydrogen peroxide as diluted to 25ml and analyzed by titration with permanganate. 2MnO4- + 5H2O + 6H+ --> 5O2 + 2Mn^2+ + 8H2O The sample required 42.8 mL of 0.0175 M permangante to reach the end point. What is the concentration of H2O2 in...
December 9, 2015

geography
describe the impact the french and Indian war had on Florida?
December 9, 2015

Chemistry
Is it true that the higher the boing point, the higher the vapor pressure?
December 8, 2015

Chemistry (I tried to do more)
I think the order of decreasing vapor pressure is Acetamide, Acetic Acid, Propanal, and Isobutane. The trend is the higher the boiling point, the lower the vapor pressure. Is this right? If not, please explain.
December 8, 2015

Chemistry
Rank the following in order of decreasing vapor pressure, and briefly explain the observed trend in vapor pressure: Acetic Acid Isobutane Acetamide Propanal
December 8, 2015

Chemistry
Would copper (II) phosphate be nonpolar?
December 7, 2015

Math
The distance a bicycle travels with each turn of its wheels is about 3 1/7 times the tire diameter. The tires on Mike's bicycle have a diameter of 24 1/2 inches. How far does it travel with each turn of the wheels?
December 7, 2015

Chemistry
How can you tell if a compound is polar or nonpolar? Is it just by lewis structures? what would copper (II) phosphate be?
December 7, 2015

Chemistry
How do you determine it then?
December 7, 2015

Chemistry
When given different elements and asked for the highest boiling point, do you figure out the molar mass and pick the highest one as the highest boiling point?
December 7, 2015

Math
6x=24
December 6, 2015

Math
That polynomial can't be factored. Double check that you copied the equation correctly, then check out mathportal dot org.
December 4, 2015

Social Studies
Describe the role of shariah in Islam. What types of laws would one expect to find within Islamic governments, and how are they enforced? This was one of my questions on my homework, and I can't figure out a solid answer to it. Thank you!
December 2, 2015

physics
A 0.014 kg bullet is fired straight up at a falling wooden block that has a mass of 4.0 kg. The bullet has a speed of 700 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision ...
November 30, 2015

phyics
Cheryl is riding on the edge of a merry-go-round, 2m from the center, which is rotating with an increasing angular speed. Cheryl’s tangential acceleration is 3.0m/s2. At the instant that Cheryl’s linear speed is 4.0m/s, what is Cheryl’s total acceleration? ...
November 29, 2015

Chemistry
The intreval volume of a clorimeter was1.12L. A sample of gas of 1.863g of nonae was added, and the closed calorimeter then had added oxygen until the pressure was 10.0atm na dht etemp was 23.1 C.Write the full balanced equation of the combustion of the nonae in the ...
November 28, 2015

Chemistry
Automotive airbags inflate when sodium azide, NaN3, rapidly decomposes to its constituent elements according to the chemical equation, 2 NaN3 -> 2 Na + 3 N2. How many grams of nitrogen are produced when 1000 milligrams of sodium azide decomposes?
November 25, 2015

differential equations
Nevermind, I got the answer.
November 25, 2015

differential equations
Convert x''+ sin(x) = 0 into a first order system of equations. (x'' refers to the second derivative of x). I tried: y1 = sin(x) y2 = x' {y1' = cosx {y2' = -sinx Not sure if I did it right.
November 25, 2015

Algebra
If you know all the answers please help me. I need help!
November 24, 2015

Algebra
1. determine whether the equation represents a direct variation , if it does find the constant of the vartion 2y=5x+1
November 24, 2015

Phyics
The foci of the elliptical path for an Earth satellite are __________. A) one at Earth's center and the other elsewhere B) one atop the other at Earth's center C) both inside Earth D) both outside Earth
November 21, 2015

geometry
given: -n+6=8n+6n prove:n=0
November 18, 2015

Chemistry
ok I set up the first one right, and got P=.998 atm The after composition makes sense and I got P = 20.0 atm Are these correct?
November 18, 2015

Chemistry
Calculate the pressure of 4.80g of ozone, O3, in a 2.45 L flask at 25 degrees C. Assume that the ozone completely decomposes to the molecular oxygen. 2O3(g) --> 3O2(g) Calculate the pressure inside the flask once the reaction is complete.
November 18, 2015

Chemistry (Check)
correct
November 18, 2015

Chemistry (Check)
What is the volume of the gas in a balloon at -195 degrees C if the balloon has been filled to a volume of 5.0L at 25 degrees C? Vf = 1.3L
November 18, 2015

Chemistry
Is it just .8252 kg/cm^3? because multiply 1000cm^3 / 1000kg
November 18, 2015

Chemistry
Calculate the density of methane gas, CH4, in kilograms per cubic meter at 25 degrees C and 956 mmHg. I got .8252 g/L but am getting confused with the converting units.
November 18, 2015

Chemistry
Calculate the pressure in an evacuated 250mL container at 0 degrees C when the O2 in 1.00 cm^3 of liquid oxygen evaporates. Liquid oxygen has a density of 1.118 g/cm^3.
November 17, 2015

Science
Nonmetals are often brittle
November 17, 2015

Biology
to produce a substance
November 17, 2015

Business
My apologies. It is the Harvard Business Review, not the Harvard Business Journal.
November 17, 2015

Business
I have to write a two page paper about a journal article. The article is "Beware the Next Big Thing" published in the Harvard Business Journal, 2014. In the essay I have to include: a. methodology b. objectives c. summary of research results d. managerial ...
November 17, 2015

Math
11
November 17, 2015

Math
It is not a function because there are multiple y-values paired with a single x-value
November 17, 2015

physics
A cross-country skier who weighs 600 N has chosen ski wax that provides ฯ=0.03. What is the minimum amount of horizontal force,perhaps from a tailwind,that would keep the skier coasting at constant speed across level snow?
November 16, 2015

math
The track team plans to sprint 20 miles this school year. The runners will sprint 1/4 mile each day.How many days will it take them to sprint 20 miles?
November 15, 2015

Chemistry (Edit)
The CH3 in a is supposed to be under the second C in the compound.
November 13, 2015

Chemistry
Isomers are compounds that have the same number and kinds of atoms but have a different arrangement of the atoms. The enthalpies of atom combination for several pairs of gaseos isomers are given here. For each pair, decide which has the strongest bonds. a. CH3CH2CH2OH -4391....
November 13, 2015

math help one question
Standard form
November 12, 2015

Math
Standard form
November 12, 2015

Chemistry
Nitrogen and oxygen can react directly with one anotheer to produce nitrogen dioxide according to N2(g) + 2O2(g) --> 2NO2(g) The reaction may also be imagined to take place by first producing nitrogen oxide N2(g) + O2(g) --> 2NO(g) which then produces NO2 2NO(g) + O2(g...
November 12, 2015

Math
31,250 with prime factorization = 2x5^6
November 12, 2015

Chemistry
Oxyacetylene torches are fueled by the combustion of acetylene, C2H2. 2C2H2(g) + 5O2(g) --> 4 CO2(g) + 2H2O(g) If the enthalpy change for the reaction is -2511.14 kJ/molrxn, how much heat can be produced by the reaction of a. 2mol of C2H2? b. 1 mol of C2H2? c. .500 mol of ...
November 12, 2015

Social Studies (please help)
It is around the 500 to 600 CE
November 12, 2015

Social Studies (please help)
In what ways were diverse people from the Arabian Peninsula through the Middle East, North Africa, and into Spain united? What held them together and unified them, and how was this done?
November 12, 2015

Chemistry
Why are the two words "alkaline" and "earth" used to name the group 2 metals?
November 11, 2015

Chemistry
Which of the following nitrogen-containing compounds would supply the most nitrogen per gram of fertilizer? a. iron azide, Fe(N3)2, MW = 140 g/mol b. sodium azide, NaN3, MW = 65 g/mol c. potassium nitrite, KNO2, MW = 85.1 g/mol d. potassium azide, KN3, MW = 81.1 g/mol e. There...
November 9, 2015

Physics
2. Consider the ball example in the introduction when a ball is dropped from 3 meters. After the ball bounces, it raises to a height of 2 meters. The mass of the ball is 0.5 kg a. What is the speed of the ball right before the bounce? b. How much energy was converted into heat...
November 5, 2015

Chemistry
Describe how you would prepare 500 mL of a 0.10 M solution of HCl from a 12.0 M solution of HCl.
November 3, 2015

Chemistry.
Mg+2HCl--->MgCl2+H2 Using the balanced equation, how many moles of H2 will you make if you start with .00082 moles of Mg solid? How many grams of H2 is that?
November 3, 2015

civics
HELP ME PLEAASSEEE!!!!!!!
November 2, 2015

civics
What motivated the Founding fathers to include the phrase "to form a more perfect union" in the preamble of the U.S Constitution?
November 2, 2015

civics
I think its B
November 2, 2015

Physics
A curling stone with a mass of 18 kg slides 38m across a sheet of ice in 8.0 s before it stops because of friction. What is the co¨efficient of kinetic friction between the ice and the stone? (Note: you will need to calculate the acceleration of the stone first.) I solved ...
October 29, 2015

Physics
An object initially at rest experiences an acceleration of 9.8 m/s^2. How much time will it take to achieve a velocity of 58 m/s?
October 28, 2015

Chemistry! HELP
A chemistry student used the symbol "sx" to represent an s orbital that lies along the x-axis. Is this reasonable. Justify your answer.
October 28, 2015

Chemistry! HELP
What information about an electron in an atom is given by the following quantum numbers? 2px+1/2 Answer? (idk if this is right) : An electron located in the p orbital in the 2nd main enrgy level would be said to be located in the 2p sublevel.
October 28, 2015

physics
A 214-kg crate rests on a surface that is inclined above the horizontal at an angle of 19.4°. A horizontal force (magnitude = 541 N and parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of static ...
October 28, 2015

Reading
Did you find the answer to the question yet?
October 23, 2015

Pre-calculus
Thanks, Ms.Sue! You are amazing!
October 19, 2015

Pre-calculus
I have (x,y,z)=(-5a-15,-a-5,a)
October 19, 2015

Pre-calculus
Solve the system of linear equations and check any solutions algebraically. (If there is no solution, enter NO SOLUTION. If the system is dependent, express x, y, and z in terms of the parameter a.) x-3y+2z=21 5x-13y+12z=81 I have an answer but i'm not sure if it's ...
October 19, 2015

physics
The drawing shows four point charges. The value of q is 1.4 μC, and the distance d is 0.86 m. Find the total potential at the location P. Assume that the potential of a point charge is zero at infinity
October 16, 2015

English
I'm just looking for some ideas for an essay on a Tale of Two Cities.... it can be anything related to the book... and I'm not asking you to do my schoolwork for me... I can develop the thesis and points but I just need some ideas... this is for a 4u course and I ...
October 14, 2015

Chemistry
doesnt the concentration come into play some how?
October 12, 2015

Chemistry
When 22.3 mL of 1.00 M AgNO3 is mixed with 21.7 mL of 1.50 M NaCl, the temperature of the mixture rises for 21.6 degrees C to 29.7 degrees C. The mass of the aqueous mixture is 45.9 grams and its specific heat capacity is 3.94 J/grams degrees C. I calculated (45.9g)x (3.94J/g ...
October 12, 2015

College Algebra
A train leaves New York for Boston, 200 miles away, at 3:00 P.M. and averages 70 mph. Another train leaves Boston for New York on an adjacent set of tracks at 4:00 P.M. and averages 55 mph. At what time will the trains meet? (Round to the nearest minute.)
October 12, 2015

Science
A hypothetical element has two main isotopes with mass numbers of 56 and 59. If 61.00% of the isotopes have a mass number of 56 amu, what atomic weight should be listed on the periodic table for this element?
October 12, 2015

functions and trig
write the transformation of X cubed if it is shifted right four units and then reflected over the X axis
October 12, 2015

Pre-calculus
STEVE YOU THE MAN! THANK YOU!
October 11, 2015

Pre-calculus
Complete the table assuming continuously compounded interest. (Round your answers to two decimal places.) Initial Investment: Annual % Rate: Time to Double: 8 yr Amount After 10 Years: $1700 I don't understand how to get in the initial investment of annual % rate given ...
October 11, 2015

Algebra
Determine a polynomial function of degree 3 with real coefficients whose zeros are ƒ{2, 1+i .
October 10, 2015

Chemistry
yes I need to find delta H. I calculated (45.9g)x (3.94J/g Celsius) x (8.1 Celsius), which came out to 1464.8526 Joules. How do I use this into solving for Delta H?
October 10, 2015

Chemistry
yes I need to find delta H. I calculated (45.9g)x (3.94J/g Celsius) x (8.1 Celsius), which came out to 1464.8526 Joules. How do I use this into solving for Delta H?
October 10, 2015

Chemistry
When 22.3 mL of 1.00 M AgNO3 is mixed with 21.7 mL of 1.50 M NaCl, the temperature of the mixture rises for 21.6 degrees C to 29.7 degrees C. The mass of the aqueous mixture is 45.9 grams and its specific heat capacity is 3.94 J/grams degrees C
October 10, 2015

Biology
In phylogenetics, we use the terms monophyletic, polyphyletic, and paraphyletic. What do each of these terms mean? How might the concept of shared, derived traits fit with these terms? I know what each of the terms mean. I am not sure about the second question.
October 8, 2015

Biology
What are the three conditions that must be met for natural selection to occur? What should happen if those three conditions are met? Define each type of natural selection, and describe what you expect to happen over time if these types of natural selection occur. Do these ...
October 8, 2015

Biology
Why is the Hardy-Weinberg Theorem useful for studying evolutionary change? What are the assumptions of this model? How does it work (in other words, describe the procedure which is used and how you figure out genotype frequencies)?
October 8, 2015

Science
I think 7 is b
October 7, 2015

Science
I need help with this too :/
October 7, 2015

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