Friday

March 27, 2015

March 27, 2015

Total # Posts: 768

**PHYSICS**

A) As a wind instrument warms up, the resonant frequencies of the instrument tend to slightly decrease. B) If the air in a concert hall warms up, the resonant frequencies of the string instruments will change precisely the same as the resonant frequencies of the wind ...
*April 15, 2011*

**calculus**

A rectangular box is to be constructed from two different materials. The box will have a square base and open top. The material for the bottom costs $4.25/m2. The material for the sides costs $2.50/m2. Find the dimensions of the box with the largest volume if the budget is $...
*April 9, 2011*

**math**

A circular pie with a diameter of 9.8 inches is cut into 7 equal slices. What is the approximate area of one slice?
*March 31, 2011*

**math**

Denisha used 9 balls of clay and 16 straws to make a solid pyramid.how many faces does the solid have?
*March 29, 2011*

**physics**

An object traveling 200 feet per second slows to 50 feet per second in 5 seconds. Calculate the acceleration of the object.
*March 28, 2011*

**math**

What is the degree of the 3rd angle if the other two are 68 degrees?
*March 28, 2011*

**Math**

20(1/5n - 3/4) + 9n
*March 22, 2011*

**physics**

0.35
*March 20, 2011*

**Financial Management**

500
*March 6, 2011*

**coordinate geometry**

all i gotta do is find slope & y intercept this is 6th math
*March 3, 2011*

**coordinate geometry**

some smart person solve thiss ;] y-18x+18=4 or help me im confused
*March 3, 2011*

**chemistry**

The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and where it seems to ...
*February 27, 2011*

**Physics**

A 55.0 kg girl is roping through the top of a tiny tree. She quickly swings down from her 12.0 m high perch and grabs a 21.0 kg dog as she swings. They barely swing back up to a tree limb. How high is this tree limb?
*February 15, 2011*

**physics-mechanics**

A high-speed test track for cars has a curved section — an arc of a circle of radius R = 1440 m. The curved section is banked at angle a = 19.1 degrees from the horizontal to help the cars to stay in the road while moving at high speeds. The acceleration of gravity is 9.8...
*February 12, 2011*

**Math**

Need help solving this problem. If there's an equation at the end, need help in how to solve that also. Compounded interest problem. Principal $825. Rate 4%. Compounded Annually. Time 10 years.
*February 9, 2011*

**j**

What were the factors that played a significant role in the collapse of Russian control over Eastern Europe?
*February 7, 2011*

**arithmetic**

How do I solve these questions? 3 1/3 - 2 2/5= 2.75 + .003 + .158 = 7/20 is equal to ? What is the value of the expression 2x2+ 3xy – 4y2 when x = 2 and y = - 4? 16x - 8 = If 2x – 3(x + 4) = - 5, then x = – 3(5 – 6) – 4(2 – 3) =
*February 3, 2011*

**Calculus**

find lim f(x) - lim f(x) x->infinity x->-infinity if f(x)=ln (x+sqrt[x^2+a^2])/(x+sqrt[x^2+b^2]) a and b are real numbers
*February 2, 2011*

**Calculus**

find lim f(x) - lim f(x)
*February 2, 2011*

**Physical Science**

If a person is traveling at a rate of seventy five miles per hour in a straight line, how far would they travel in three seconds?
*February 1, 2011*

**Physics**

A watch manufacturer claims that its watches gain or lose no more than 8s in a year.
*February 1, 2011*

**comm**

extra is a adjective right???
*January 18, 2011*

**comm**

envelope-adverb credit-adjective spent-adverb
*January 18, 2011*

**comm**

came over- adjective frowning- adverb
*January 18, 2011*

**comm**

this is the reason why getting a credit card at a young age is not a great idea because you get anxious and want to buy a lot of things when you know you don't have the money.
*January 18, 2011*

**comm**

yes i do need help
*January 18, 2011*

**comm**

i need help identify adjectives and adverbs:My dad added me as an extra card holder on his credit cards. I was very excited that I could purchase products now and pay for them later. I didn’t realize how much money I was spending. He came over to my house recently, ...
*January 18, 2011*

**physics**

Okay, I have an example problem that I'm trying to solve that comes with the answer; I'm just trying to figure out what to do. A man jogs at a speed of 1.8 m/s. His dog waits 2 s and then takes off running at a speed of 4 m/s to catch the man. How far will they have ...
*January 15, 2011*

**Conductivity**

you are amazing!
*January 12, 2011*

**history**

Who were some of the original Texas Wildcatters?
*January 6, 2011*

**physics pleaaaaaaaaaaaaaaaaaaaaaaaaaaaaaase I need**

Consider a square ABCD of side 10cm and total mass 10kg. Let O be the center of the sqaure. We cut a square of corners O and C. Find the central mass of the obtained shape after removing the small cutten sqaure. I appreciate your help. thank you
*January 6, 2011*

**math/ physics**

Consider a square ABCD of side 10cm and total mass 10kg. Let O be the center of the sqaure. We cut a square of corners O and C. Find the central mass of the obtained shape after removing the small cutten sqaure. I would appreciate your help. thank you
*January 6, 2011*

**algebra**

2y-6x=8 2y=6x+8 y=3x+4 please explain this to me
*January 5, 2011*

**math**

i was shown example: x+6=-5 6=-5 6--5=x x=-11 please explain to me how they got this
*January 5, 2011*

**world history**

What are some characteristics of Greek civilizations?
*December 14, 2010*

**Physics**

TH/TC=(1)/(1-0.308)
*December 10, 2010*

**physics**

your so stupider than me if you donts know hows to do this problam!
*December 6, 2010*

**Europe**

what is the most important advantage og having germany in the European Union?
*December 2, 2010*

**Chemistry**

-q = dH ( dH = change in enthalpy Kj/mol) Use q=mc(Tf-Ti) and then convert to deltaH q=mc(Tf-Ti) q =? c= 4.814 J/g*C use specific heat of water since its in aqueous sol and we are not told differently m= total mass= mass KBr + mass water mass KBr= 5.0 g *mass of water from ...
*December 2, 2010*

**math**

Hmm 12 is already an even number! Hence you should not count 12 twice, therefore answer should be 7/15. :)
*November 27, 2010*

**social studies**

Hi majenta, In my view a thesis statement is only good if it is properly justified. In this case, you have to clarify what you mean by "important" - which may be subjective (different people may interpret it differently) as well as rather broad. So like what I think ...
*November 27, 2010*

**holy name university**

Hi january, Dalton's Law of partial pressures states that P(total) = P(1) + P(2) + P(3) +....+ P(n) where 1, 2 and 3 are gases in the mixture. So applying the law 150kPa = 100kPa + 24kPa + P(oxygen) Hope I helped! (: -J
*November 27, 2010*

**chemistry**

Oops, sorry, my apologies for typing in caps. Was just trying to point that out. :)
*November 26, 2010*

**chemistry**

Hi faye, Alright so we want to prepare a 800ml solution of 0.15M concentration. So first we calculate the amount of Ca(OH)2 **NOTE: SHOULD NOT BE CA(OH) COS +2 CHARGE OF CA2+ IS NOT BALANCED! CA(OH)2 IS A SOLID AND NOT AN ION, HENCE THE COMPOUND CANNOT HAVE AN OVERALL CHARGE...
*November 26, 2010*

**Chemistry**

Hi Lindsay, Alright, to begin with, since this is an organic compound, we identify the functional group. [-C(=O)-NH- means its an amide] So when you hydrolyse an amide, you are breaking the (amide) bond between C=O and N-H, and you add water because its a hydrolysis (OH- goes ...
*November 24, 2010*

**chem class**

Hi laney, For this question, it would be appropriate for you to ask yourself.. what is present in the solution after mixing? KOH is a strong basic salt while HCL is a strong acidic salt. KOH + HCL --> KCL + H2O Note that amount of KOH = HCL = 0.125 X (50/1000), so there is ...
*November 24, 2010*

**chemistry**

Hi roseanne, First, we write out the equation when MX2 dissolves in water (or a suitable solvent): MX2 --> (reversible arrow) M2+ + 2X- So Ksp = [M2+][X-]^2 Solubility would refer to the concentration of an ion produced in 1:1 ratio with the original solid. In this case, we...
*November 24, 2010*

**Chem, LAST ONE PLEASE HELP!**

Hey Tara, Hmm, I'm not too sure about this question, but I'd guess it has something to do with the following formula: G = G(not)+ RTlnQ So basically G(not) = -67.4 kJ R= 0.008314 kJ mol^-1 K^-1.(molar gas constant)(Note that units must be kJ to match up with the G(not...
*November 24, 2010*

**physics**

Hi sweetie, As a coconut is falling down, the only force acting on it is the gravitational force (its weight) if you neglect air resistance. So as it is accelerating as it falls, velocity ______. P.E. of coconut = mgh, where m = mass of coconut, and h = height of coconut above...
*November 24, 2010*

**physics**

Hi sweetie, momentum = mass (kg) X velocity (m/sec). So for 1) At rest, velocity = 0m/sec. So momentum should be.... (Apply formula above) [Ans:0 kgm/sec] for 2) At that final state, velocity = 30m/sec. So momentum should be.... (Apply formula above) [Ans: 90,000kgm/sec] for 3...
*November 24, 2010*

**chemistry**

Hi Tara, To find out if a reaction is spontaneous, we calculate E(cell). If E(cell)>0, reaction is spontaneous. If E(cell)<0, reaction is not spontaneous. If E(cell)=0, reaction will proceed until equilibrium is established. So in this case, E(cell) = E(reduction)-E(...
*November 24, 2010*

**maths**

Oops sorry! I realised that I also made a mistake near the end. When I said "...Therefore, 24x=98cm.." I meant 14x (Not 24!) = 98cm. =)
*November 24, 2010*

**maths**

Hi aisha, Let's start with formulating an algebriac expression for the perimeter. We know that perimeter of rectangle = 2(length) + 2(width). Since we don't know length or width, we let x be the width of the rectangle. Hence length = 5x-3 [because length = (5 X width...
*November 24, 2010*

**chemistry**

Hi Tara, Alright, by convention, we usually write [Oxidation]/[Reduction]in notation. Hence, the oxidation half-cell is the Cr/Cr3+ half-cell while the reduction half-cell is the Ni2+/Ni half-cell. [Alternatively, you can compare E(not) values such that the half-cell with the ...
*November 24, 2010*

**chemistry**

That comes from multiplying 3X10^-8 and 0.0385 when we expand 3X10^-8(0.0385-x).
*November 23, 2010*

**chemistry**

Hiya, From what you said it seems that you understand everything up till "x = [H+]= 3.4 x 10^-5 M" So we know that 3X10^-8 = x^2/(0.0385-x) Bring (0.0385-x) over to the left hand side, Hence 3X10^-8(0.0385-x) = x^2 Then we expand the left hand side, 1.155X10^-9 - ...
*November 23, 2010*

**HUM176**

Newspapers, once available only in print, have evolved into 24-hour multimedia operations. In addition to newspapers, briefly describe the evolution of movies, television, Internet, books and magazines, and media companies throughout the last century.
*November 21, 2010*

**algebra**

(6*5)/3 is this a true sentence
*November 21, 2010*

**Probabilities**

1.) two marbles are drawn without replacement from a bowl containing seven red, four blue, and nine yellow marbles. what is the probability that at least one is red? 2.)a card is drawn from a standard deck of 52 cards. what is the probability that the card is neither a four or...
*November 9, 2010*

**Probabilities**

1.) two marbles are drawn without replacement from a bowl containing seven red, four blue, and nine yellow marbles. what is the probability that at least one is red? 2.)a card is drawn from a standard deck of 52 cards. what is the probability that the card is neither a four or...
*November 9, 2010*

**AP Chem**

66 kJ/mol
*November 7, 2010*

**chemistry**

could someone please still explain? and explain how the 4.74 pH was found? thanks
*November 7, 2010*

**chemistry**

couple someone please still explain? and explain how the 4.74 pH was found? thanks
*November 7, 2010*

**Social Studies**

name if the following involve, seperation in powers, checks and balances, judicial review, federalism, or some combination of these principles, and say why A) the state law requires that a prayer be said each day in public schools. The courts rule that law wiolates a first ...
*October 31, 2010*

**Calculus 2**

I am having so many problems with these volume problems, 1. Find the volume of a the solid obtained by rotating the region enclosed by: x = 2y and y^3 = x with y>0 about the x axis 2.Find the volume of cone of height h = 250 and a circular base with radius r = 150 First ...
*October 23, 2010*

**physics**

A horizontal spring, resting on a frictionless tabletop, is stretched 14 from its unstretched configuration and a 1.00- mass is attached to it. The system is released from rest. A fraction of a second later, the spring finds itself compressed 3.6 from its unstretched ...
*October 15, 2010*

**Social Studies**

I need help making an MLA works cited. i have 3 sources... they are all newspaper articles that i found online. someone please help me
*October 13, 2010*

**tangential speed and accelerations**

A helicoptor bladehas an angular speed of 6.50 rev/s and has an angular acceleration of 1.30 rev/s. point 1 on the blade is 3.00m and point 2 is 6.7m. Can you find the speeds of A) the tangential speeds and B) the tangential accelerations?
*October 12, 2010*

**physics**

a truck is traveling to the right and slowing down. If we define a positive displacement to be motion to the right, the truck has...What Velocity and acceleration?
*October 12, 2010*

**physics**

What average power is required for a runner with a mass of 80 kg to reach a speed of 8.2 m/s during a time of 1.8 s?
*October 10, 2010*

**chemistry**

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?
*October 4, 2010*

**chemistry**

You need to prepare 500.00 mL of a 0.25 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.25 M solution?
*October 4, 2010*

**english**

Is this a better present tense sentence? I think education is a very important role in successful financial planning. And is THINK the verb?
*September 29, 2010*

**english**

Is this past perfect I had never studied financing until I signed up for college.
*September 29, 2010*

**english**

Would this sentence be past simple tense or past perfect tense? I learned how to create a financial plan and to budget money in my class.
*September 29, 2010*

**english**

What verb tense would this sentence be? I am learning so much about financial planning in my personal finance class.
*September 29, 2010*

**English**

Is this a present tense verb sentence? I believe education is a very important role in successful financial planning
*September 29, 2010*

**English**

what is the proper verb tense? With an education i will be able to find a better job?
*September 29, 2010*

**college**

what is the proper verb tense in the sentence below? With an education i will be able to find a better job?
*September 29, 2010*

**college**

I need to write 5 sentences showing the verb and its tense. The sentences need to be about the role of education in sucessful financial planning. I am so confused
*September 29, 2010*

**College Physics**

a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
*September 26, 2010*

**algebra**

solve for v: p = mv explain how to get the answer and what the answer is please
*September 25, 2010*

**algebra**

solve for d: s= d/t HELP EXPLAIN HOW TO DO THIS PLEASE
*September 25, 2010*

**algebra**

solve for m: F = ma someone tell me how to do this please!!!!!
*September 25, 2010*

**algebra**

will someone tell me what the answer is to this problem? and how they got the answer? SO CONFUSED solve for x: y = mx + b
*September 25, 2010*

**icp**

Charge q is 1 unit of distance away from the source charge S. Charge p is six times further away. The force exerted between S and q is _____ the force exerted between S and p.
*September 20, 2010*

**physics**

Thanks guys!
*September 19, 2010*

**physics**

A 4kg object is subjected to two forces, F1=2Ni-3Nj, and F2=4Ni-11Nj. The object is at rest at the origin at t=0. What is the objects acceleration? I know you use F=m*a Do you add the two F vectors together & take the square root to find the sum of F? ex: Fnet=6Ni-14Nj & then ...
*September 19, 2010*

**Physics **

A wooden boxcar is moving along a straight railroad track at speed v1. A sniper fires a bullet (initial speed v2) at it from a high-powered rifle. The bullet passes though both lengthwise walls of the car, its entrance and exit holes being exactly opposite each as viewed from...
*September 18, 2010*

**math**

The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 2.5 to 8.5 millimeters. What is the probability that a randomly selected ball bearing has a diameter less than 4.5 millimeters? a.0.38, b.0.28, c....
*September 18, 2010*

**math**

Write and solve an equation to model the situation: two friends are renting an apartment. they pay the landlord the first months rent. the landlord also requires them to pay an additional half of a month's rent for a security deposit. the total amount they pay the landlord...
*September 16, 2010*

**math**

5-x-x=-1 will someone please tell me how do do this problem?
*September 16, 2010*

**physics**

A steam catapult launches a jet aircraft (from rest) from the aircraft carrier John C. Stennis, giving it a speed of 160 mi/h in 2.40 s. Find the average acceleration of the plane. Assuming that the acceleration is constant, find the distance the plane moves.
*September 16, 2010*

**physics**

A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s. Find the truck's original speed. Find its acceleration.
*September 16, 2010*

**physics**

original speed and acceleration
*September 16, 2010*

**physics**

A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s.
*September 16, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 35 mi/h to a speed of 70 mi/h?
*September 15, 2010*

**spanish**

Que te gusta hacer? Will someone give me some possible answers for this question?
*September 15, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.50 m/s2. How long does it take for this car to go from a speed of 45 mi/h to a speed of 85 mi/h?
*September 14, 2010*

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