Saturday

March 28, 2015

March 28, 2015

Total # Posts: 281

**chemistry**

What is the ph of 0.25 M tartaric acid? Ka=2.5*10^-5M
*March 1, 2015*

**physics**

Two masses of 3.25 kg each, connected by a string, slide down a ramp making an angle of 31° with the horizontal. The coefficient of kinetic friction between m1 and the ramp is 0.31. The coefficient of kinetic friction between m2 and the ramp is 0.17. Find the magnitude of ...
*February 27, 2015*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*February 27, 2015*

**physics**

A block with a mass of 4.25 kg is placed at rest on a surface inclined at an angle of 44.8° above the horizontal. The coefficient of static friction between the block and the surface is 0.520, and a force of magnitude $F$ pushes upward on the block, parallel to the ...
*February 24, 2015*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*February 22, 2015*

**physics**

A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the bucket.
*February 17, 2015*

**physics**

When you lift a bowling ball with a force of 60.7 N, the ball accelerates upward with an acceleration a. If you lift with a force of 69.3 N, the ball's acceleration is 1.99a. Calculate the weight of the bowling ball.
*February 15, 2015*

**physics**

Initially, a particle is moving at 5.45 m/s at an angle of 38.5° above the horizontal. Four seconds later, its velocity is 6.24 m/s at an angle of 54.3° below the horizontal. What was the particle's average acceleration during these 4.00 seconds in the x-direction...
*February 4, 2015*

**Physics**

A charge of 8.0 x 10^(-6) is located inside a sphere. What is the flux through the sphere? Im not sure if this would be just the charge over elipson0. it seems to easy...
*February 3, 2015*

**College Algebra**

A total of $14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest. The combined interest for one year is $539. If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.
*December 3, 2014*

**algebra**

P = 2L + 2W 34 = 2(W + 7) + 2W
*November 27, 2014*

**Algebra**

x+y = 156 x = y+28
*November 27, 2014*

**Physics**

Thank you Henry! You did a really nice job and it helped me a lot!! (:
*November 26, 2014*

**Physics**

4.82 kJ work is done by a worker pulling a crate across the deck of a ship at a constant speed of 7.82 m/s by a 453 N force. The rope is being pulled at a 37.0 degree angle to the deck. a)How far was it pulled? b)What is the friction force? c)What is the work done against ...
*November 26, 2014*

**science**

all alkalies are bases but all bases are not alkalies
*October 18, 2014*

**Chemisty**

Brad
*September 15, 2014*

**Math, Physics**

A soccer ball is kicked from the ground at an angle of è = 46 degrees with respect to the horizontal. The hang time of the ball is tm = 1.9 s. What is the total horizontal distance traveled by the ball in meters?
*September 11, 2014*

**Physics**

What is the magnitude of the electric force between a proton and an electron when they are at a distance of 2.63 Angstrom from each other?
*August 29, 2014*

**Physics Electricity and Magnetism**

F=Eq q=F/E q=2.34^-4/6620
*August 29, 2014*

**intro to computers**

There is no way to enforce security on a USB
*May 31, 2014*

**math**

what integer represents a 500 dollar deposit
*May 19, 2014*

**Algebra 2**

Yoko threw a stone upward at a speed of 10m/sec while standing on a cliff 40 m above ground. A. What was the height of the stone after 3 seconds? B. Estimate how long it took for the stone to touch the ground
*February 6, 2014*

**Physics**

The speed of light in polythene is 1.99 x 108 m/s What is the index of refraction of polythene
*January 20, 2014*

**physics**

An inductor (L = 405 mH), a capacitor (C = 4.43 µF), and a resistor (R = 400 ) are connected in series. A 50.0 Hz AC generator produces a peak current of 250 mA in the circuit. (a) Calculate the required peak voltage ΔVmax. V (b) Determine the phase angle by which ...
*December 1, 2013*

**Intro to computers**

The USB stick is formatted with a fat 32
*November 14, 2013*

**Math**

Rose has a square garden with an area of 49 square feet. She wants to put a fence around her garden. How much fencing does she need to purchase?
*October 12, 2013*

**CALCULUS**

using d^2(h/dt^2=−g+k(dh/dt^2, find an expression for the terminal velocity in terms of k and g? g is the acceleration due to gravity, k is a constant, h(t) is the height of the falling object, dh/dt is its velocity, and d^2(h)dt^2 is its acceleration. And can you ...
*October 7, 2013*

**Calculus**

Could you explain as to how you got that answer?
*October 7, 2013*

**Calculus**

using d^2(h)/dt^2=−g+k(dh/dt)^2, find an expression for the terminal velocity in terms of k and g? g is the acceleration due to gravity, k is a constant, h(t) is the height of the falling object, dh/dt is its velocity, and d^2(h)/dt^2 is its acceleration.
*October 7, 2013*

**physics**

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 9.7-kg projectile from rest to a speed of 6.5 × 103 m/s. The net force accelerating the projectile is 8.0 × 105 N. ...
*June 24, 2013*

**math**

You are the accountant for Suite Dreams, a retail furniture store. Recently, an order of sofas and chairs was received from the manufacturer with terms of 3/15, n/45. The order amounted to $230,000, and Suite Dreams can borrow money at 13% ordinary interest. How much can be ...
*June 22, 2013*

**math**

Varsity Press, a publisher of college textbooks, received a $70,000 promissory note at 12% ordinary interest for 60 days from one of its customers, Reader’s Choice Bookstores. After 20 days, Varsity Press discounted the note at the Grove Isle Bank at a discount rate of 14...
*June 22, 2013*

**math**

Euromart Tile Company borrowed $40,000 on April 6 for 66 days. The rate was 14% using the ordinary interest rate method. On day 25 of the loan, Euromart made a partial payment of $15,000, and on day 45 of the loan, Euromart made a second partial payment of $10,000. What was ...
*June 22, 2013*

**English12**

I have a thesis started, I kind of decided on my topic, how Lewis has influenced such writers like JK Rowling, Tolkien and helped them write the novels they are so famous for here is the thesis statement so far "Modern interpretive Literature has led the way for some of ...
*May 30, 2013*

**English12**

I have read the narnia books, I have another book called "A Life" by Michael White its a biography, the essay is as I said before 1500 word minimum, I am looking at arguing how he was influential and is influential still today in his writings, I am having issues ...
*May 30, 2013*

**English12**

Need help on a Research paper, my author is CS Lewis, I am having a major writers block on what to write about, teacher has left it fairly open, need to have an outline and cited works today but he is pretty slack I could have it in tomorrow and be fine, either way stuck on ...
*May 30, 2013*

**Corporate Finance**

Your firm is looking at 3 projects, each costing $500,000: A is estimated to save $125,000 per year for 5 years; B is estimated to save $75,000 for 6 years plus generate tax savings of $20,000 per year; C is estimated to save $75,000 per year for 10 years but requires ...
*April 28, 2013*

**Chemistry**

3. Using Bohr’s model of the atom, calculate the energy required to move an electron from a ground state of n = 2 to an excited state of n = 3. Express your answer in both J/photon and kJ/mol.
*April 23, 2013*

**science **

if u travel 1.5 and the box way 93 she traveled 62 watts I think
*April 10, 2013*

**Geometry**

When you use the distance formula, you are building a _____ triangle whose hypotenuse goes between two given points. A.right B.equilateral C.acute D.None of these
*March 26, 2013*

**Life orientation**

*Describe ;)
*March 26, 2013*

**Life orientation**

*hazards *crisis *globally ;)
*March 26, 2013*

**Biochemistry**

In plants, it can be assumed that NADPH like NADH is energetically equivalent to 2.5 ATP. Calculate the number of ATP and ATP equivalents that are needed to synthesize one molecule 0f glucose-6-phosphate from CO2 and photosynthetically produced ATP and NADPH.
*March 25, 2013*

**math**

y3K, Inc., has sales of $5,276, total assets of $3,105, and a debt–equity ratio of 1.40. If its return on equity is 15 percent, what is its net income? Can someone help with a formula?
*March 18, 2013*

**Calculus**

a ladder 6m long is leaning against a wall. if the top of th ladder is slipping down at th rate of 13 m/s, how fast is the bottom moving away from the wall when it is 5m from the wall? (answer in m/s) Please Help Before 230 pm central time
*March 8, 2013*

**math**

A planned community has 300 homes, each with an automatic garage door opener. The door opener has eight switches that a homeowner can set to 0 or 1. For example, a door opener code might be 01100101. Assuming all the homes in the community are sold, what is the probability ...
*March 3, 2013*

**math**

A bag contains 44 U.S. quarters and six Canadian quarters. (The coins are identical in size.) If seven quarters are randomly picked from the bag, what is the probability of getting at least one Canadian quarter? (Round your answer to one decimal place.)
*March 3, 2013*

**math**

If a person draws two cards from a standard deck (without replacing them), what is the probability that at least one of the cards is a face card? (Round your answer to one decimal place.)
*March 3, 2013*

**calculus**

Find the value for W when the limit as x approaches 8 of ((2x^2)-7x + W)/(x-8) = 25
*February 26, 2013*

**calculus**

evaluate the following limit... ((1-x)/((1/e)-(e^-x))) as x approaches one
*February 26, 2013*

**calculus**

what is the limit of (9x/(9x+5))^(6x) as x approaches infinity?
*February 26, 2013*

**physics**

the total potential difference from point A to point B in a circuit is +5 V. The total potential difference from point A to point C in a circuit is -16 V. What must be hte potential difference from point B to point C?
*February 20, 2013*

**7th grade math please help Ms. Sue ASAP**

you know Delilah our math teacher looks at this if you are going to connexs
*February 13, 2013*

**chemistry**

Molarity = moles of solute/ Liter. 5g O2 * (1 mol O2/ 32 g O2)= x moles O2 convert 250 mL to Liters X moles O2/ Liters = molarity
*December 12, 2012*

**chemistry**

When using the van't Hoff factor, I multiply the number of moles of CaCl2 by the factor right? So when finding the mole fraction of CaCl2 in the solution, it would be 3(1.22 mol CaCl2)/[3(1.22) + 12.2] which equals about .231. So then it would be dP = .231 * 239 = 55.2 mm ...
*December 12, 2012*

**chemistry**

Okay so I used the equation dP= Xsolute * Psol. I got 32.3 and it was correct. I used the exact same equation for this one, and I got 21.7. For some reason it was incorrect. What am I doing wrong? The vapor pressure of pure water at 70°C is 239 mm Hg. What is the vapor ...
*December 12, 2012*

**chemistry**

What's the difference between Psol and Pvap depression? How would I find the Pvap depression?
*December 12, 2012*

**chemistry**

The vapor pressure of pure water at 70°C is 231 mm Hg. What is the vapor pressure depression of a solution of 115 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of water? Use molar masses with at least as many significant figures as the data ...
*December 12, 2012*

**English**

i have the words in front of me with the meaning.... so I am lost thats all I can say...
*December 6, 2012*

**English**

1. poignant 2. contend 4. conversely 7. prevalent 8. contemporary 9. charisma
*December 6, 2012*

**English**

those r my answers
*December 6, 2012*

**English**

Many people are surprised to learn how __1__ poverty is __2__ America. Today millions live below the poverty line, and the number seems to escalate daily. Judy and Martin Reed exemplify the old saying, “Opposites attract.” A __3__. Judy chooses work that brings her ...
*December 6, 2012*

**english**

then 5 has to be wrong
*December 3, 2012*

**english**

4. benefactor 7. speculate 9. alleviate
*December 3, 2012*

**english**

Shortly before the Russian Revolution, an eccentric man named Rasputin became ___1___as the "mad monk." Because he dressed like a peasant, drank heavily, and rarely bathed, the nobility often felt __2__during their encounters” with him at the palace. Yet despite...
*December 3, 2012*

**english**

Shortly before the Russian Revolution, an eccentric man named Rasputin became ______as the "mad monk." Because he dressed like a peasant, drank heavily, and rarely bathed, the nobility often felt ____during their encounters” with him at the palace. Yet despite ...
*December 3, 2012*

**English**

thank you it wouldnt surprise me if u didnt get more from these words..... from other class mates.... once again ty
*December 3, 2012*

**math**

solve the logarithmic equation. log(5x+7)=1+log(x-9)
*December 2, 2012*

**math**

find the inverse. f(x)=-2+log_4(x-4)
*December 2, 2012*

**math**

how do you write that in interval notation?
*December 2, 2012*

**math**

solve the following inequality. (x-3)^2/(x^2-4)is greater than or equal to 0.
*December 2, 2012*

**math**

find the real solutions using quadratic formula. im sorry.
*December 2, 2012*

**math**

8-(1/x)-(6/x^2)
*December 2, 2012*

**math**

find the real solutions using the quadratic formula 6-(1/x)-(4/x^2)=0
*December 2, 2012*

**math**

find the inverse of f(x)=-5+log(base5)(y-5)
*December 2, 2012*

**algebra**

Find the accumulated value of a CD of $20000 for 3 years at an interest of 3.1% if the money is compounded continously.
*November 30, 2012*

**algebra**

So, 5.9 to be exact?
*November 30, 2012*

**algebra**

How long will it take $1400 to double at 12% annual interest compounded quarterly?
*November 30, 2012*

**Physics HELP!**

A simple pendulum consists of a small object of mass 7.40 kg hanging at the end of a 2.10 m long light string that is connected to a pivot point. (a) Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes a 3.00° ...
*November 7, 2012*

**Chemistry **

Find the theoretical pH of .01M and .05M benzoic acid buffer when 2ml of .1MNaOH was added to each buffer.
*November 1, 2012*

**Physics**

A ball acquires a horizontal speed of 12m/sec when a force is applied for a distance of .50m. If the ball has a mass of 1.0kg what is the force applied? ANSWER: 144N....I'm not sure what formulas I'd apply. It takes a force of 109N to life a stone straight up. This ...
*October 12, 2012*

**Chemistry**

How many times more energy is associ- ated with a 282 nm ultraviolet photon than a 5494 nm microwave photon?
*October 10, 2012*

**Statistics: Regression**

The June 1997 issue of Management Accounting gave the following rule for predicting your current salary if you are a managerial accountant. Take $31,865. Next, add $20,811 if you are top management, add $3604 if you are senior management, or subtract $11,419 if you are entry ...
*October 10, 2012*

**math**

A population is increasing according to the exponential function defined by y = 2e0.02x, where y is in millions and x is the number of years. How large will the population be in 3 years?
*August 1, 2012*

**geometry**

the radius of the base of the metallic rod is 2o centimeters and height 15 centimeters what is the volume of a cylinder
*May 22, 2012*

**geometry**

the radius of the base of the metallic rod is 2o centimeters and height 15 centimeters what is the volume of a cylinder
*May 22, 2012*

**Probability and Statistics**

A package contains 12 resistors, 3 of which are defective. If four are selected, find the probability of getting the following. No defective resistors One defective resistors 3 defective resistors
*May 17, 2012*

**Probability and Statistics**

A package contains 12 resistors, 3 of which are defective. If four are selected, find the probability of getting the following. No defective resistors One defective resistors 3 defective resistors
*May 17, 2012*

**Maths**

In a box of fruit there were 11 oranges and 9 apples. What fraction of the fruit were the oranges?
*May 2, 2012*

**veterinarians as prescribers**

Alteration of the physical form of a drug outside its label is
*April 27, 2012*

**chemistry**

calculate the pressure when 57 g of flourine at 55 degrees celsius is confined to a 152 liter container.
*April 22, 2012*

**Chemistry**

help...If exactly 5.0 mL of HNO3 will neutralize 15 mL of 2.0 M NaOH, what is the molarity of the HNO3 solution? Have no idea what to do. thank you.
*March 25, 2012*

**Statistics**

Suppose that the travel time from your home to your office is normally distributed with a mean of 40 minutes and standard deviation of 7 minutes. If you want to be 95% certain that you will not be late for an office appointment at 1:00pm, what is the latest time that you ...
*March 20, 2012*

**chemistry**

So i found the solubility to be x=0.001296, is this the concentration of I^-? can i multiply this by 30mL to get my moles?
*March 16, 2012*

**chemistry**

how can i calculate the solubility with the information given ? in class we use concentrations to find solubility
*March 16, 2012*

**chemistry**

A 30.00mL sample of a clear saturated solution of PbI2 requires 14.7mL of a certain AgNO3 for its titration. I^-(saturated PbI2)+Ag^+(from AgNO3)--> AgI(s) What is the molarity of this AgNO3? I'm not really sure where to start.
*March 16, 2012*

**chemistry**

A mixture formed by adding 55.0 mL of a 1.5x10^-2 M HCl to 140 mL of 1.0x10^-2 M HI. How do you calculate the pH for this problem?
*February 26, 2012*

**Chemistry**

Ba(OH)2(aq)+2CH3COOH(aq)=Ba(CH3COO)2(aq)+2(l)H2O what is the net ionic equation with phases?
*February 18, 2012*

**Math**

1.2mi.
*February 15, 2012*

**math**

Ms.Sue,is the ans 3?
*November 21, 2011*