Monday

May 2, 2016
Total # Posts: 899

**Physics 1**

A mass of 5 kg lies on a frictionless, horizontal floor. A force of 135 Newtons is applied to the mass at an angle above the positive x axis and a force of 14 Newtons is applied to the mass at an angle of 22.8 degrees below the negative x direction (see sketch). If the angle ...
*October 4, 2011*

**chemistry**

What is the specific heat capacity of a metal if it requires 176.1 J to change the temperature of 15.0 g of the metal from 25.00°C to 30.00°C?
*October 4, 2011*

**simplify**

23.68 ÷6.4 3.7
*September 28, 2011*

**math**

three men and their wives were given $5400. the wives together received $2400. sue had $200 more than jan, and ellen had 200 more then sue. who was married to whom?
*September 28, 2011*

**math**

a box of munchkins contains chocolate and glazed donut holes. if Gloria ate 2 chocolate , then 1/11 of the remianing munchkins would be chocolate. if she added 4 glazed to the box, 1/7 of the box would chocolate. how many munchkins are in the original box?
*September 28, 2011*

**math**

peg spends $7.50 a week for grapefruit. When grapefruit are out of season, she gets 1 fewer grapefruit than when they are in season. If the price decreases by $3 per dozen in season, how many dollars will it cost her to buy a dozen grapefruit out of season?
*September 28, 2011*

**Physics help!**

F= ma= Tension-Weight ma+Weight=Tension (4125kg)(0.0300 * 9.8)+ (4125kg)(9.81)=Tension Calculate and this will give you the answer for maximum force. For part (2) You have to subtract them (ma-weight)
*September 26, 2011*

**geometry**

This circle has a circumference of 56. What is the radius of the circle?
*September 21, 2011*

**math**

describe all the numbers when rounded to 312,000
*September 8, 2011*

**MATH**

USING AM IMAGINARY FIGURE OF $19,250.00 AS AN ANNUAL INCOME FIGURE, HOW MUCH MONEY COULD YOU SAVE A YEAR IF YOU BUDGETED HALF OF 2.4%?
*September 7, 2011*

**math**

You have 2 floors, and there are 14 steps inbetween the two floors. you have a cat that can get to the top by either taking one step at a time or two steps. ( at one time going up the cat can take both one or two steps). How many possible combinations are there for the cat to ...
*September 2, 2011*

**geometry**

Given ABCD, solve for x.
*August 30, 2011*

**geometry**

Line e bisects line xy at m and divides line xy into two equal parts. name a pair of congruent segments.
*August 24, 2011*

**chemistry**

sorry. The reaction is: 2 NO(g) + Cl2 ---><--- 2NOCl deltaH is the heat of reaction deltaS is the change in entropy T is temperature in kelvin deltaG is a direct measure of spontaneity DeltaH (kJ/mol) 2NO= 90.29/mol DeltaH (kJ/mol) Cl2= 0 DeltaH (kJ/mol) 2NOCl= 51.71/mol...
*August 1, 2011*

**chemistry**

Gibbs free energy What is the equilibrium constant at 25 C? deltaG= deltaH - (T(K)+deltaS) deltaS= -121.1 deltaH= -77.36 so at 25 C deltaG = -77.36 - (298*(-121.1)) deltaG ~ 3.6*(10^4) so my question is: what *is* the equilibrium constant, or perhaps more accurately, how does ...
*August 1, 2011*

**rate of reaction (formatted repost)**

I can't get my table to line up so I've surrounded the values in curly brackets. Experiment [SO2]i [O2]i IRD O2 {1} {0.05} {0.05} {7.3*[10^(-2)]} {2} {0.10} {0.05} {2.9*[10^(-2)]} {3} {0.10} {0.15} {2.6*[10^(-1)]} {4} {0.12} {0.12} {?????????????} so overall oreder is ...
*July 20, 2011*

**rate of reaction**

What is the initial rate of *appearance* of SO3(g)? a reaction and table are given: reaction: 2S02(g)+O2 -------> 2 SO3(g) Table note: i= initial, IRD= initial rate of disappearance; concentrations given in molarity (M) IRD given in M/s. Experiment [SO2]i [O2]i IRD O2 1 0....
*July 20, 2011*

**Social STUDIES**

Deez nutz
*July 7, 2011*

**math**

Express the volume of a rectangular solid (box) whose height, width and length are x,2x and 3x, respectively, as a function of its width.
*July 1, 2011*

**Psychology **

While all four are definitions of a mental disorder, the correct answer is D.
*June 28, 2011*

**physics**

a driver releases an air bubble of volume 2.0 cm^3 from a depth of 15 m below the surface of a lake where the temperature is 70C.
*June 21, 2011*

**chemistry**

13.88 mol oxygen
*June 3, 2011*

**Education**

So are the answers B, and D
*May 9, 2011*

**chemistry**

Is there a relationship between HOMO & LUMO and bonding & antibonding? Explain.
*April 18, 2011*

**PHYSICS**

Its actually FFTF, thanks for the help
*April 15, 2011*

**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*

**Math Finite**

0.2442
*December 9, 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*