Wednesday

December 7, 2016
Total # Posts: 2,392

**physics**

how do i solve this, i tried dividing the mass by the height, but its wrong A 407-kg pile driver is raised 15 m above ground. (a) How much work must be done to raise the pile driver?__kj (b) How much work does gravity do on the driver as it is raised?__kj (c) The driver is now...

*April 4, 2010*

**College Chemistry**

Thank you i appreciate it.

*March 30, 2010*

**College Chemistry**

Part a: What mass of solid CuCL2 is required to prepare 450.0mL of 0.125M CuCl2 solution?? Part B: What are the concentrations of Cu +2 ions and Cl- ions in the above solutions. I understand part a, and got the right answer. i need help understanding part b.

*March 30, 2010*

**calc-kinematics**

if a particle moves along a line so that at time t where t [0,pi] its position is given by s(t)=-4cost-t^2/2+10 what is the velocity of the particle when its acceleration is zero? so i found v(t) = 4sint-t a(t)=4cost-1 = 0 solved for t plugged it into v(t) and i got the wrong ...

*March 30, 2010*

**calc-related rates**

"The volume of a cone of radius r and height h is given by V=1/2(pi)(r^2)(h)If the radius and the height both increase at a constant rate of .5 cm per second at WHAT RATE in cubic cm per second, is the volume increasing when the height is 9 cm and the radus is 6 cm" ...

*March 30, 2010*

**Chemistry**

When solving using the quadratic equation, I get two possible values. Which one do I use? Both are positive.

*March 29, 2010*

**Chemistry**

What is the pH of a 0.0054 molar solution of Oxalic Acid. K1= 6.5E-2, K2= 6.1E-5? Here's what I have so far for K1: 6.5E-2 = (x)(x)/ (x-0.0054) x= 0.0059 pH = -log(0.0059) = 2.23 K2 is pretty much the same, but I have to work it out. 6.1E-5 = (x)(x + 0.0059)/ (x-0.0059) x...

*March 29, 2010*

**calc**

how to find the integral of this function x^2 * root(x^3+1)

*March 28, 2010*

**calc**

how do i find the derivative of........ (sinx) ^2-(cosx) ^2 i put it into my t-89 and got -4sinxcosx butthats not a multiple choice. can someone tel me how to do this by hand?

*March 28, 2010*

**chemistry**

Choose all of the following statements about the equilibrium constant K that are true: (a) If the K value for a reaction is > 1 then Go must be negative for this reaction (b) A large value for K implies there is a strong driver for the reaction to proceed in the forward ...

*March 28, 2010*

**Math**

What is 563 divided by 4 show you work

*March 25, 2010*

**grammar**

preschool ivite pablo on thursdays.

*March 25, 2010*

**Chemistry**

I'm not real sure about the K1 expressions. Is this correct? C2H2O4 --> H+ + C2O4H- K1 = (x + 0.0054)(x + 0.0054)/ (0.0054-x) Solve for x then repeat for K2

*March 24, 2010*

**Chemistry**

What is the pH of a 0.0054 molal solution of C2H2O4. First ionization constant K1= 6.5 x 10-2, second K2= 6.1 x 10-5.

*March 24, 2010*

**Chemistry**

Is the answer 0.211 mg/L PbF2?

*March 24, 2010*

**Chemistry**

If PbF2 is poured into a solution of 0.012 molar F-, how much will dissolve at equilibrium?

*March 24, 2010*

**physics**

wait but kqq/r2 is the equation for a force not an energy

*March 23, 2010*

**physics**

An alpha particle approaches a uranium nucleus as 1e6 m/s what is the closest this particle will get to the nucleus how do you set this problem up? thanks!

*March 23, 2010*

**Math**

help with math questions how much does Jamie pay for a 1 pounds 12 ounces of apples at a dollar 96 per pound

*March 23, 2010*

**Chemistry**

when dissolved in an aqeous solution, which of the following salts will yield an acidic solution? NH4Cl, NaClO4, Na2S, MgBr2, Ba(CH3CO2)2

*March 22, 2010*

**English**

I have no idea, I cannot think clearly at all today. I wouldn't even know where to start, even though I know what an analogy is.

*March 20, 2010*

**PHYSICS PLEASE HELP!**

Suppose an electron is released from rest in a uniform electric field whose magnitude is 4.70 103 N/C. (a)How much work is done by the field in moving the electron through a distance of 7 cm? J (b) Through what potential difference will it have passed after moving through this...

*March 17, 2010*

**PHYSICS PLEASE HELP!**

(a)How much work is done by the field in moving the electron through a distance of 7 cm? J (b) Through what potential difference will it have passed after moving through this distance? V (c) How fast will the electron be moving after it has traveled this distance? m/s

*March 17, 2010*

**chemistry**

Thank you!

*March 16, 2010*

**chemistry**

So how would I put AgNO3 in the equation? That part kind of confuses me.

*March 16, 2010*

**chemistry**

The traditional method of analyzing the amount of chloride ion present in a sample was to dissolve the sample in water and then slowly add a solution of silver nitrate. Silver chloride is very insoluble in water, and by adding a slight excess of silver nitrate, it is possible ...

*March 16, 2010*

**Chemistry**

There was a typo on the problem. and cobalt was never meant to be used. It should have read copper which went along with previous questions. Hence, everyone's confusion. Thanks

*March 16, 2010*

**Chemistry**

Determine the moles of ammonia in the following cobalt ammine complex: A sample of .1500 g of the cobalt ammine complex is places in a flask and 25.00mL of .200M HCL is added. a few drops of bromocresol green is added and the titration with .100M to NaOH required 16.42mL. I ...

*March 16, 2010*

**7th grade**

Transmission

*March 15, 2010*

**college Psychology**

I am having trouble describing the interaction (How does effect of one Independent variable depend on level of other independent variable and why?) My 1st independent variable is Type of Stimulus: with 2 levels pictures and words. My 2nd independent variable is Type of Content...

*March 14, 2010*

**Accounting**

a 10 year zero coupon bond that yield 5% is issued with a 1000 par value. w hat is the issuance price of the bond

*March 8, 2010*

**french**

how would you say a 'model village'?

*March 7, 2010*

**french**

how would you say 'a minster' not a minister

*March 7, 2010*

**french**

thankyou

*March 7, 2010*

**french**

how would you say 'it's a market town'?

*March 7, 2010*

**Investments Analysis**

Can anyone help with ANY of these? Any good starting points would be great! Alpha (STI) 0.90 2008 Return(STI) 15% Beta(STI) 1.20 2008 Return(INX) 10% R_squared 36% Risk Free Rate 4% Variance(STI) .1296 b. What is the relative volatility (variability) of STI returns to INX ...

*March 6, 2010*

**arithmetic**

what is 11/4,4/7 and 10/21 in the simplest form i tried adding divide not coming with the right answer

*March 3, 2010*

**math**

how to simplify 15/60 in a fraction

*March 3, 2010*

**spanish**

Islam ich bien im

*March 2, 2010*

**spanish**

Que mama sorté quou

*March 2, 2010*

**Chemistry**

For the equilibrium below at 400 K, Kc = 7.0. Br2(g) + Cl2(g) reverse reaction arrow 2 BrCl(g) If 0.90 mol of Br2 and 0.90 mol Cl2 are introduced into a 1.0 L container at 400. K, what will be the equilibrium concentration of BrCl?

*March 2, 2010*

**chemistry**

HCl + Zn --> Predict the products and decide if it occurs. I have the activity series, but there's only H2 on there, not H.

*February 28, 2010*

**maths **

what is 8% p.a on $11000 over 3 years compounding anually

*February 28, 2010*

**Chemistry**

In one experiment, 50.0ml of 0.10M CH3NH2, is mixed with 20.00ml of 0.10 M CH3NH3Cl. The kb of CH3NH2 is 3.70*10^-4. a) write the chemical reaction for the equilibrium which becomes established, using H2O as a reactant. b)Write the net-ionic equation that occurs when Ba(OH)2 ...

*February 27, 2010*

**earths core**

what are a few (1 or two) reasons why the core cant be of lonestones?

*February 23, 2010*

**science**

was their any changes to the ocean since 10 million years ago?

*February 23, 2010*

**Social Studies**

What were the conditions of the mines during the Industrial Reolution? Why did so many women want to work in the mines without clothing and have heavy belts around their waists and chains between their legs?

*February 22, 2010*

**us history**

Write an Essay about the different perspectives that a chinese native and a christian missionary might have had on the Boxers rebellion

*February 22, 2010*

**pre-calc**

Find a vector perpendicular to the plane containing the given points. (0,-2,2), (1,2,-3), and (4,0,-1) My teacher was unable to finish the lesson, but I'd like to know how to solve this problem.

*February 17, 2010*

**Physics**

NOt rude at all. Just wants to see some effort from the poster. Although, if it's their first time posting they may not know that. The person who posted should just repost saying, "I tried this," or "I'm not sure what this means, but does it have to do ...

*February 17, 2010*

**lotions **

what kind of moisturizers will melt faster overtime ?

*February 15, 2010*

**Global History**

How did transportation improved during the Industrial Revolution?

*February 15, 2010*

**how to..**

how to answer this question ? describe how someone could improve the following areas of fitness in the pool. 1.cardio cascular, 2.muscle strength, 3.muscular endurance. what does this mean ? how do i answer this?

*February 13, 2010*

**Science**

125 mL of water at 10 C is poured onto a 500 g block of ice at -35 C. Assuming it is a perfectly insulated container, what will be the final temperature of the mixture?

*February 10, 2010*

**business studies**

how does the sale of fixed assets and retained earnings help in raisihg business finance

*February 8, 2010*

**physics**

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.10 m/s and her body makes an angle of 77.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude ...

*February 7, 2010*

**physics**

An airplane is flying with a velocity of 224 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.1 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle?

*February 7, 2010*

**Calc**

let f be the function whose graph goes through the point (3,6) whose derivatie is given by f'(x) =(1+e^x)/(x^2) 1. write an equation of a line tangent to the graph at x=3 and use it to approximate f(3.1) --- I GOT : y= (1+e^3)/(9) (.1) +6 i don't know if it is right i ...

*February 7, 2010*

**college**

A 14-year zero-coupon bond was issued with a $1000 par value to yield 12%. What is the approximate market value of the bond?

*February 6, 2010*

**Hydraulics**

A cylinder with a 3" bore and a stroke of 16" receives 18 gpm. What is the piston rod velocity?

*February 1, 2010*

**Mays Middle**

Math-The low temperature for 6 consecutive days in Montana city were 9, 3, 4, 16, 11, and 5 degrees. What would the low temperature have to be on the seventh day to have a meanh low temperature of 9 degrees for the week?

*February 1, 2010*

**microeconomics**

Suppose a production possibilities frontier can be expressed as + = 9. The opportunity cost of going from 0 units of X to 1 unit of X is

*January 31, 2010*

**College Physics 1**

A drag racer, starting from rest, speeds up for 402 m with an acceleration of +24.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.40 m/s2. How fast is the racer moving 3.75 102 m after the parachute opens

*January 31, 2010*

**College Physics 1**

A drag racer, starting from rest, speeds up for 402 m with an acceleration of +24.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.40 m/s2. How fast is the racer moving 3.75 102 m after the parachute opens

*January 31, 2010*

**Physics **

If a pronghorn antelope accelerates from rest in a straight line with a constant acceleration of 1.4m/s^2, how long does it take for the antelope to reach a speed of 23m/s? ____s

*January 29, 2010*

**Physics**

A particle experiences a constant acceleration that is north at 100m/s^2. At t=0, its velocity vector is 70m/s east. At what time will the magnitude of the velocity be 100m/s? ____s

*January 29, 2010*

**Physics**

An engine pulls a train of 20 frieght cars each having a mass of 5.0*10^4 kg with a constant force. The cars move from rest to a speed of 4.5 m/s in 19.7s on a straight track. Neglecting friction, the force with which the tenth car pulls the eleventh one (at the middle ofthe ...

*January 29, 2010*

**Physics**

A man lifts a 1.0 kg stone vertically with his hand at a constant upward acceleration of 1.8m/2^2. what is the magnitude of the total force of the stone on the man's hand? In Newtons downward?

*January 29, 2010*

**holocaust**

How were Jews viewed in the United States in the pre-WWII era?

*January 27, 2010*

**math**

A hill is inclined at 18 degrees to the horizontal. If the base of the hill is at sea level, find my height above sea level if i walk 1.2 km up the hill

*January 25, 2010*

**physics**

In the Millikan oil drop experiment, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates. Some of the droplets pick up one or more excess electrons. The charge on the plates is adjusted ...

*January 24, 2010*

**10th grade english**

A __________ sets up one's argument and provides a basis from which one will build his or her essay.

*January 23, 2010*

**world issues**

Canada has developed in many ways since Wrold War 1. From that time to the present, what do u think are the three greatest accomplishments achievements or improvments Canada has seen? why? give specific reasons for your choices. I need this help because i don't know what ...

*January 21, 2010*

**dante's inferno**

seriously?

*January 19, 2010*

**dante's inferno**

What does Dante say will heal all light which was dim?

*January 19, 2010*

**statistics**

The weights of pineapples grown are approximately normally distributed with a standard deviation of 2.5 and mean of 31 ounces. Suppose a single pineapple is selected at random. a. If a single pineapple is selected at random, what is the approximate probability that it weighs ...

*January 18, 2010*

**6 grade math**

Two dice are rolled. Find the odds in favor of a sum of 6.

*January 18, 2010*

**algebra**

6-5*8+2^3

*January 15, 2010*

**math**

Lines 1 and 2 are parallel. If 5 = 116°, what is the measure of 4?

*January 12, 2010*

**Pre-Cal**

Solve 5sinx=-4cosx for 0 less than or equal to x <2pi answers to nearest hunderth of a radian

*January 10, 2010*

**Pre-Cal**

Nancy and Harry are lifting a stone statue and moving it to a new location in their garden. Nancy is pushing the statue with a force of 120 newtons(N) at a 60 degree angle with the horizontal while Harry is pulling the statue with a force of 180 newtons at a 40 degree andgle ...

*January 10, 2010*

**Physics-lunar**

they gave us a diagram of the moon chart like at waxing waning stuff like that and then the question,... At what time will a full moon rise? Please enter military time in whole hours, ex. 15 for 3 pm.

*January 8, 2010*

**Physics-lunar**

At what time will a full moon rise? Please enter military time in whole hours, ex. 15 for 3 pm.

*January 8, 2010*

**Systems operations management**

answer for both

*January 5, 2010*

**microeconomics 3**

. As tradition has it, Santa Claus is coming on the 5th of December from Spain to the Netherlands to bring gifts to Dutch children. Help is needed to distribute the gifts for which the Santa Claus committee is hiring helpers, so-called Zwarte Pieten. There are two types of ...

*January 3, 2010*

**Pre-Cal**

Hi, can someone please solve this step-by-step for me? I really don't get it... Directions: Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x. 4cos^2x-4cosx-1=0 thanks.

*January 1, 2010*

**pre-cal**

What are the steps for solving this? Directions Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x. 4cos^2x-4cosx-1=0 thanks.

*January 1, 2010*

**math**

Find a rational number between 3/5 and 4/5

*December 13, 2009*

**physics**

A diver swims to a depth of 3.2 m in a freshwater lake. What is the increase in the force pushing in on her eardrum, compared to what it was at the lake surface? The area of the eardrum is 0.60 cm2.

*December 13, 2009*

**physics**

What percentage of a floating iceberg’s volume is above water? The specific gravity of ice is 0.917 and the specific gravity of the surrounding seawater is 1.025.

*December 13, 2009*

**accounting**

how would interest on a bank loan be adjusted using joural intries

*December 11, 2009*

**spanish II**

how do you say these sentences in spanish How long shall I take it for and Take it for 2 weeks until the pain stops.

*December 10, 2009*

**algabra **

on pizzazz 27 what is the answer to "what is it like to live under a rug"

*December 9, 2009*

**social science**

would this be the answer the Democrats and Republicans dominate the U.S. political system. many timesa third parties have greatly influenced national politics, even though their candidate did not win the election.

*December 9, 2009*

**social science**

What impact have third parties had on the United States?

*December 9, 2009*

**need help asap**

8x-2-5x=8 solve for x answers are a)1.3 b)2 1/2 c)3 1/2 d)7

*December 9, 2009*

**7th**

what is the smallest prime greater then 200 is it 201 205 211 214

*December 9, 2009*

**math**

When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and ...

*December 8, 2009*

**biology**

examples of a food web that tells the order

*December 6, 2009*