Wednesday
April 16, 2014

Posts by Chelsea


Total # Posts: 742

Calc 2
i know that for 3/k(k+1)(k+2) I would use partial fraction representation

Calc 2
find the sum of the series: sum from k=1 to infinity [(3/k(k+1)(k+2))+(-2/3)^k]

Calculus II
Compute the first 5 terms of the sequence: {b(n)}n=1-> infinity = nsqrt(6n) + (5/6)^n. ((that is:(Bsub(n))from n=1 to infinity = nth root of 6n + (5/6)raised to n.)) If the sequence converges, find the limit.

Calculus II
Consider the sequence: (a,sub(n))={1/n E(k=1 to n) 1/1+(k/n)} Show that the limit(as n-> infinity) A(sub(n))= ln 2 by interpreting a(sub(n)) as a Reimann Sum of a Definite Integral.

Calc 2
Consider the sequence: (a,sub(n))={1/n E(k=1 to n) 1/1+(k/n)} Show that the limit(as n-> infinity) A(sub(n))= ln 2 by interpreting a(sub(n)) as a Reimann Sum of a Definite Integral.

Calculus II
Compute the first 5 terms of the sequence: {b(n)}n=1¨‡ = nã6n + (5/6)^n. ((that is:(Bsub(n))from n=1 to infinity = nth root of 6n + (5/6)raised to n.)) If the sequence converges, find the limit.

calc 2
my professor is killing me....

calc 2
(last one) ... Let f(t) be a function defined for all values of t. The Laplace Transform of f(t) is defined by: F(s)= ç[∘,‡](e^-st(f(t))dt). If the improper integral exists, Find the Laplace Transform for f(t)= sinhat

Calc2
Let f(t) be a function defined for all values of t. The Laplace Transform of f(t) is defined by: F(s)= ç[∘,‡](e^-st(f(t))dt). If the improper integral exists, Find the Laplace Transform for F(t)=t^2.

Calculus II
the gamma function r(x) is defined by r(x)= integral from 0 to infinity of x^n-1(e^-1)dx where n>0. Use integration by parts to show that r(n+1)=nr(n).

Calculus II
the gamma function r(x) is defined by r(x)= integral from 0 to infinity of x^n-1(e^-1)dx. find r(1), r(2), r(3)

Calculus II
using integration by partial fraction, prove that pi + integral from 0 to 1 of x^4(1-x)^4/1+x^2 = 22/7

Physics
2.3) The question says "range of speeds", so i was expecting a quadratic formula.( What do you mean by reversing mu?

Physics
@Damon: I don't understand why that is the answer for 2.1

Physics
I need to check my answers for the following: An Aston Martin V8 Vantage sports car has a maximum “lateral acceleration” of 0.96 “g’s”, after which the car begins to skid out of its turn. 2.1 Calculate the coefficient of static friction between the car...

chemistry
how much heat is required when 6.00g of water is melted at its melting point

Calc 2
Find the length of the curve y^2=x^3 from the origin where the tangent line makes an angle of 45 degrees with the x-axis.

world geography/geography
The forests of the Pacific Northwest are just one of the many different ______________ in the United States where many people work in the same industry. A. elevation regions<<<< B. political regions (C. climate regions)< got this one wrong D. economic regions

Calculus II - Trapezoidal Rule
Find the error resulting from approximation by Trapezoidal Rule: integral (from 0 to 1) sqrt(1+ x^3) dx .... compute the results for n=8

Calculus II - Simpson's Rule
Find the Error resulted from approximation by Simpson's Rule: integral (from 0 to 1) sqrt( 1+x^3) dx ... compute the result for n=8

Calculus II
okay, i'm just not exactly sure where to start in trying to prove this though.

Calculus II
show that; given any three non-collinear points (x1,y1), (x2,y2), (x3,y3) there is a parabola p(x)=Ax^2+ Bx + c , containing the three points.

Math
Could someone help me with these questions? Thanks! a) A cargo plane left Vancouver, British Columbia (time zone −8) at 3:00 p.m. on a Monday. The plane flew for 11 h to Paris, France (time zone +1). At what local time and on what day did the plane land in Paris? b...

Physics Please check my answers
When I did it, I saw that 8 was true, is that right?

Physics Please check my answers
were the others correct?

Physics Please check my answers
A sound of 7 kHz frequency is well within the normal hearing range of most people. True. False. << 2. Sound is a transverse compression wave. True. False.<< 3. The decibel level of a sound can have a negative value. True.<< False. 4. The Doppler effect occurs...

Physics Please check my answers
Sorry, I forgot to put my answers in. 1. Complete reflection is the special case of refraction at an angle of 180. True. << False. 2. A resonant frequency is the same as a natural frequency. True. << False. 3. For a standing wave, the number of segments is an integ...

Physics Please check my answers
1. Complete reflection is the special case of refraction at an angle of 180. True. False. 2. A resonant frequency is the same as a natural frequency. True. False. 3. For a standing wave, the number of segments is an integer equal to the number of half-wavelengths. True. False....

Physics Please check my answers
Were the first 2 correct?

Physics Please check my answers
1. A fluid can only be a liquid. True << False 2. One atmosphere is equal to 14.7 psi. True << False 3. In a fluid, pressure depends on the density of the fluid and the depth. True False << 4. Pascal's Principle says that the buoyant force on an object fl...

Physics Please check my answers
It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of i...

Physics
so basically 39%?

Physics
I got 38.88 is that correct?

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)

Physics
An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.

Math (PreCal)
Kurt wants to sail his boat from a marina to an islnd 15 miles east of the marina. Along the course, there are several small islands they must avoid. He sails first on a heading of 70 degrees and then on a heading of 120 degrees. What is the total distance he travels before re...

chemsitry
The molecular geometry of POCl3 is tetrahedral. What hybridization does this indicate for the central P atom? Why is the answer spy?

Chemistry
60.0 mL of O2 was collected over water at a total pressure of 755 torr and a temp of 25C. The vapor pressure of water at 25C is 24 torr. How many moles of O2 were collected? Could you please explain and show the steps? I know the answer is 2.36x10^-3.

Chemistry
What will be the concentration of the solution formed when 5.72mL of 8.50M HCl is diluted to 250mL?

Chemistry #4
What is the concentration of a solution formed by dissolving 10.0g of ammonium acetate in enough water to form 150.0mL of solution? Could someone please explain and show me how to do this? I have the answer= .865M But I am not sure exactly how?!

Chemistry
H(f) Cl= 121.3 kj H(f) C= 716.7 H(f) CCl4= -95.7 calculate the average molar bond enthalpy of the carbon-chlorine bond in a CCl4 molecule. I have tried to figure it out and keep getting the wrong answer. Please help!

Physics
A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of the table. The other e...

Yanii
This anomalous expansion plays an important role by only freezing the upper layer in lakes and rivers. During winter months in colder countries the outside or atmospheric temperature is very low - it drops to below freezing - and the upper layers of water in the lakes and pond...

chemistry
Please I need help in knowing how to solve this. I know I need to take the antilog of something but don't know what.What is the values of [H3O+] for a solution with [OH−]=1×10−5M?

chemistry
5.00×10−3mol of HBr are dissolved in water to make 15.0L of solution. What is the concentration of hydroxide ions, [OH−], in this solution?

chemsitry help again please
Write the formula of the conjugate base for acid HClO2 .

networking
A firm is assigned the network part 128.171 It selects a 10-bit subnet part a) draw the bits for the first four octets of the IP address of the first host on the first subnet. b) convert this answer to dotted decimal notation. c) Draw the bits for the second host on the third ...

chemistry
I am having a hard time with this problem. I was wondering where I went wrong. The problem says The equilibrium constant, Kc, for the reaction of H2 and N2 is 1.7×10^2 at 225 ∘C. 3H2(g)+N2(g)←→2NH3(g) If the system at equilibrium contains 0.16M H2 and 0...

Chemistry
If the wavelength if determined to be 0.018 nm, at what velocity is the electron traveling? (The mass of an electron is 9.11x10^-31kg) I know the answer is 4.0x10^7 m/s, but i cannot figure how they got this. Could someone please explain it to me and show me? Thanks!!

chemistry
I am still having trouble with this question It says What is the molarity of a solution containing 18.0g of KCl in 262mL of KCl solution? When I calculated it I got .92154 m. I had changed 18 g into moles and 262 ml into liters and then divided the moles into liters. I was won...

Chemistry Please :/
When a metal was exposed to light at a frequency of 4.26× 1015 s–1, electrons were emitted with a kinetic energy of 4.50× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) ...

Chemistry #13
When a metal was exposed to light at a frequency of 4.26× 1015 s–1, electrons were emitted with a kinetic energy of 4.50× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) ...

chemistry volume problem
Can someone please explain to me how to do this?! I am completely lost. Calculate the volume indicated for each of the following: liters of a 2.00M KCl solution to obtain 0.600mol of KCl.

Algebra
no

Chemistry #4
How long does it take (in minutes) for light to reach Earth from the Sun, a distance of 1.589 × 108 km?

Physics HELP!!
A small ball of mass m=0.60 kg hangs from a massless string of length l= 1.2 m. The ball travels in a vertical circle and its speed at the bottom is v0= 6.0 m/s (see figure). Neglect all friction and air drag, and use g=10 m/s2 for the gravitational acceleration. The ball is s...

chemistry
How many grams (of mass m) of glucose are in 355mL of a 5.50% (m/v) glucose solution?

PLEASE HELP!! ;(
I'm so confused

Chemistry #17
I have no idea!

Chemistry #17
When a 5.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.982 kJ-K, the temperature decreases by .210 K. Calculate the molar heat of solution of KBr. =____kJ/mol

Chemistry #25
Could you do the first one for me so I can see please?

Chemistry #25
Use enthalpy of formation data to calculate the number of moles of CO2(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1atm and 25 degrees C) a. coal C(s, graphite) = _____mole-MJ b. natural gas, CH4(g)= c. propane, C3H8(g...

Chemistry #27
Sorry i meant H(rxn) (of the reaction)

Chemistry #27
Given that: H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value for H(run) for... 2F2(g) + 2H2O (l) ---> 4HF (g) + O2 (g) _____kJ?

Chemistry
A certain gas has a density of 1.053 g/L at 25C and 752 mmHg. What is the molar mass of this gas?

Chemistry #11
Sorry I meant .79= density

Chemistry #11
A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml of ethanol in enough water to make 120.0 ml of solution. What is the molarity of the ethanol in this solution? 46.07 g= molar mass of ethanol .079 g/ml=density

Chemistry
What is the sodium concentration when a solution is formed by mixing 60.0 ml of 0.150 M sodium carbonate with 75.0 ml of 0.225 M sodium bicarbonate?

AP Chemistry
1 atm= 101325 Pa 1 atm= 101.325 kPa

Chemistry #27
If He(g) has an average kinetic energy of 4410 J/mol under certain conditions, what is the root mean square speed of O2(g) molecules under the same conditions?

Chemistry #26
where R=8.314 J/(mol·K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kg·m2/s2. What is the rms speed of N2 molecules at 335 K? What is the rms speed of He atoms at 335 K?

Chemistry #25
Calculate the average translational kinetic energy (sometimes just called average kinetic energy)...for one mole of gas at 381 K.

Chemistry #30
A sample of Br2(g) takes 10.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane?

Chemistry
If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the reaction? I have t...

Chemistry
I have figured out that 32.34 grams of solid precipitate will form but I'm not sure how to figure out the grams of the reactant in excess? I thought it was 22.01 g but that isn't right.

Chemistry
If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the reaction? I have t...

Chemistry
Oh dern, okay thanks!

Chemistry
Enter the net ionic equation, including phases, for the reaction of AgNO3(aq) with BaO(aq). Is it... Ag+O2--->AgO?

Chemistry- dilution
51.0 mL of a 1.20 M solution is diluted to a total volume of 248 mL. A 124-mL portion of that solution is diluted by adding 125 mL of water. What is the final concentration? Assume the volumes are additive.

Chemistry
What is the pressure of the gas in a manometer if the height in between is 71mm and the atmospheric pressure is 761mmHg?

Chemistry 22
Table salt NaCl and sugar C12H22O11 are accidentally mixed. A 6.00 g sample is burned and 2.90 g of CO2 is produced. What was the mass percentage of the table salt mixture? Could you please show me all the way through if you can?

Chemistry 10
reaction of AgNO3 with BaO... Would it be Ag^+ + O^---> AgO (s)

Chemistry
NaHCO3 (s) + HC2H3O2 (aq) ---> ?

Chemistry
Oh, Got it! .168?

??
.156 M?

Chemistry
The limiting reactant is the KOH with .069 moles right? So then I go from mol KOH to grams of K2SO4?

Chemistry
Write the balanced neutralization reaction between H2SO4 and KOH in aq. solution. .350 L of .410 M H2SO4 is mixed with .300 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization? ______ M H2SO4

Chemistry
6.34 g??

Chemistry
It's hard for me to wrap my brain around. I just learned all of this stuff! AH

Chemistry
Are the moles of Pb(ClO3)2 .01375?

Chemistry
Write the balanced equation for (aq) Pb(ClO3)2 and (aq) NaI. Include phases. What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with .250 L of .110 M NaI? Assume the reaction goes to completion.

Thanks Dr. BOB!!
It's 33.9mL!!!!!! :) Thanks

Chemistry
.849mL?

Chemistry
Zinc reacts with hydrochloric acid according to the reaction equation... Zn (s) + 2HCl (aq) ---> ZnCl2 (aq) + H2 (g) How many milliliters of 5.00 M HCl (aq) are required to react with 5.55 g of Zn (s)??

It says you can do it???
Assume that the start point is 0.0mL

Chemistry
The flask here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains .270 M NaOH. What volume of NaOH is needed to reach the end point of titration? What was the initial concentration of HCl?

Chemistry
2HBr (aq) +OH^-(aq)----> 2H2O (l)+Br2^-(aq)???

Chemistry
For the following, 2HBr (aq) + Ba(OH)2 (aq) ---> 2H2O (l) + BaBr2 (aq) write the net ionic equation including the phases

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