Sunday
November 23, 2014

Posts by jessi


Total # Posts: 114

AP World History
What are the effects of cultural diffusion in the Mediterranean? (I couldn't find the answer in my text book, the only thing I got was that the Mediterranean was able to adopt Greek culture.) Thank You Very Much!!
October 26, 2014

chemistry
5.00g aluminum sulfide and 10.0g water react according to the reaction: Al2S3 + 6 H2O -> 2 Al(OH)3 + 3 H2S What is maximum mass of H2S that can be formed? What mass of excess reactant remains when the reaction is complete?
October 12, 2014

math
if a gardener fences in the total rectangular area shown in the illustration instead of just the square area,he will need twice as much fencing to enclose the garden.how much fencing will he need ?
September 26, 2013

Biology
What role does the environment play in convergent evolution?
November 20, 2012

Biology
Yes, but it has to be about evolution in general, not just humans.
November 17, 2012

Biology
Describe the changes you'll see (evolution wise) if you were granted 1 million years of life.
November 17, 2012

Biology
Describe the changes you'll see (evolution wise) if you were granted 1 million years of life.
November 17, 2012

personl finance
Bill Mason is considering two job offers. Job 1 pays a salary of $43,300 with $5,310 of nontaxable employee benefits. Job 2 pays a salary of $40,500 and $6,380 of nontaxable benefits. Use a 20 percent tax rate.
June 13, 2012

Physics! plese help
A 1320-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure, find (a) the magnitude of the tension in the wire and the magnitudes of the (b) ...
June 7, 2012

Physics
Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.5x10-5 m/s. (a) What is the angular speed (the magnitude of the angular ...
June 7, 2012

PLEASE HELP ME!!!
CAN YOU HELP ME PLEASE UNRGENTLY NEEDED.THANKS FOR HELPING ME TO GET SOME ANSWERS FOR THIS QUESTION BELOW. 1. SOME VALLEYS WERE NOT ERODED BY THE RIVERS FLOWING IN THEM.VALLEYS CAN BE FORMED BY FAULTING AND GLACIAL EROSION. WHAT FEATURES COULD YOU LOOK FOR WITH IN VALLEYS TO ...
April 25, 2012

Calculus-derivatives
Determine h'(x) for h(x)= [x/(1-x)]^2
February 20, 2012

Calculus
Which of the following is a point at which the tangent to y=(x-2)^2(x+3) is horizontal? a) (-2,16) b) (-1, 18) c) (1,4) d) (2,0) I found the derivative of y=(x-2)^2(x+3) which is 3x^2-2x-8 if I solved for 0, it wouldn't give me the answer that are listed above. What did I ...
February 19, 2012

Calculus
So y2-y1=m(x2-x1) y-(-2)=-6(x-(-1) y=6x-1 therefore the slope of tangent is 6?
February 19, 2012

Calculus
Determine the slope of the tangent to the curve y=2(x^2+x-1)^3 at (-1, -2)
February 19, 2012

Calculus
Determine the coordinates of the point(s) on the graph of y=3x- 1/x at which the slope of the tangent is 7. So the derivative of y=3x- 1/x is y'=3 + 1/x^2 What do I do next?
February 18, 2012

Math
How many horizontal tangents does the graph of f(x)=(x-1)^2(x-3)^2 have? f(x)=(x-1)^2(x-3)^2 =2(x-1)(1)+2(x-3)(1) =2x-2+2x-6 f'(x)=4x-8 0=4x-8 =4(x-2) x=2 Therefore it only has 1 horizontal tangents?
February 18, 2012

Physics
How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 3500 m?
October 30, 2011

Physics
I'm in this class too :/ For this problem, you have to use both equations F=Ma and F=(mv^2)/r Step 1: solve for F using F=Ma 5.70kg x 9.81 m/s^2 = 55.917 N Step 2: plug this into the other equation 55.917N = (2.40kg x v^2)/0.500m (55.917N x .5m)/2.40kg =11.65 m^2/s^2 (...
September 30, 2011

algebra
how do you use the substitution method to solve x + y =2 y = -2x
April 29, 2011

math: pre calculus
How do I find the exact value of sec(2.4)?
March 9, 2011

algebra
One side of a rectangle is 12 inches, and the other side is x inches.What values of x will make the perimeter at most 44 inches?
February 3, 2011

Personal Finance
During a job interview, Pam Thompson is offered a salary of $50,000. The company gives annual raises of 12 percent. What would be Pam’s salary during her fifth year on the job?
January 29, 2011

biology
how is it possible for an enzyne to lower the required energy of activation for a reaction.
December 14, 2010

chemistry
How many moles of antifreeze (a molecular substance) must be added per liter of water to protect the cooling system of a motocar to -30 degrees F.
December 14, 2010

Kinesiology
Joey weighs 77 lb and sits on a seesaw at a distance of 30 inches from the fulcrum. Jenny weighs 67 lb and sits on the opposite side of the seesaw at a distance of 48 inches from the fulcrum. Mikey weighs 30 lb and wants to play but doesn’t know where to sit in order to ...
December 5, 2010

11th grade
so I have this problem and I dont know what numbers to multiple and whatnot. Can someone help me? This is the problem: 4000 g Fe2O3* 1mole Fe2O3/159.68 gFe2O3* 3mole CO2/1mole Fe2O3
December 2, 2010

pre-calculus
2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i dont know what he is really asking , does any one have an idea if i have to solve for y or what's going on.. how would this be done..
September 20, 2010

Chemistry!!
42.8 divided by 181 equals 0.236
May 21, 2010

science
Can you help me balance some equations? I tried and failed several times... 1. calcium hydroxide + phosphoric acid yield calcium phosphate + water 2. copper + sulfuric acid yield copper(II) Sulfate + water + sulfur dioxide 3. hydrogen + nitrogen monoxide yield water + nitrogen...
November 10, 2009

physics
A particle is released on the smooth inside wall of a cylindrical tank at A with a velocity v which makes an angle beta with the horizontal tangent. When the particle reaches a point B a distance h below A, determine the expression for the angle theta made by its velocity with...
November 7, 2009

Cost Accounting
Katherine Company's Sales Budget Has The Following Unit Sales Projection For Each Quarter Of The Calendar Year 2009. January -March 540,000 April-June 680,000 July-September 490,000 October-December 550,000 Total 2,260,000 Sales for the first quarter of 2010 are expected ...
November 7, 2009

physics
i see where you went wrong. you have 7.5E6 and the second radius and it's supposed to be 7.0E6. yeah that's how i worked the problem. i converted my answer wrong when i went from m/s to km/h thank you for your help!
November 6, 2009

physics
Upon its return voyage from a space mission, the spacecraft has a velocity of 24000km/h at point A, which is 7000km from the center of the earth. Determine the velocity of the spacecraft when it reaches point B, which is 6500km from the center of the earth. The trajectory ...
November 6, 2009

Cost Accounting
PLEASE, PLEASE, can you give me the step to calculate these: 1.Prepare the beginning inventory for the first quarter 2.Prepare the budgeted beginning inventory for the second - fourth quarters 3.Prepare the budgeted production for each quarter 4.Prepare the budgeted production...
November 5, 2009

management accounting
Fi a company has a policy of maintaining an inventory of finished goods equal to 30 percent of the following month's sales. For the forthcoming month of March, Ball has budgeted the beginning inventory at 30,000 units and the ending inventory at 33,000 units. This suggests...
November 4, 2009

physics
The 60kg collar slides on the curved rod in the vertical plane with negligable friction under the action of constant force F in the cord guided by the small pulley at D. If the collar is released from rest at A, determine the force F which will result in the collar striking ...
October 31, 2009

physics
sorry the angle theta is measured below the radius to the vertical
October 31, 2009

physics
A small bead of mass m is carried by a circular hoop of radius r which rotates about a fixed vertical axis. Show how one might determine the angular speed w of the hoop by observing the angle theta which locates the bead. Theta is measured to the right of the vertical axis. ...
October 31, 2009

Physics
Block A has a mass of 20kg and is placed on top of cart B which has a mass of 100 kg. Blosk A has a pulley attatched to it with a force of P acting towards the right. Cart B is on rollers. The coefficient of kinetic and static friction are both the same value of 0.5. Find the ...
October 23, 2009

Physics
thanks! i was multiplying by 0.82 instead of dividing
October 18, 2009

Physics
A 120-V motor has mechanical power output of 2.00 hp. It is 82.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor (b) Find the energy delivered to the motor by electrical transmission in 3.30 h ...
October 18, 2009

physics
In the design of a control mechanism, the vertical slotted guide is moving with a constant velocity x'= 15in/s during the interval of motion from x= -8in to x= +8in. For the instant when x= 6in calculate teh n- and t-components of acceleration of the pin P, which is ...
October 11, 2009

geometry
How are the radii of 2 two concentric circles related to the distance between them? I tried making an equation using their cirmcumferences but I was way off. All I did was subtract the inner circle's circumference from the outer circle's circumference and set it equal ...
October 11, 2009

physics
wait it would be different. wouldn't you just subtract 15 since it's starting from an angle with 15 less degrees?
October 10, 2009

physics
would beta be different for part b?
October 10, 2009

physics
A meteor P is tracked by a radar observatory on the earth at O. When the meteor is directly overhead (theta = 90), the following observations are recorded: r = 80km, r'= -20km/s, and theta'= 0.4rad/s. (a) Determine the speed of hte meteor and the angle, beta, which it...
October 10, 2009

physics
thank you so much! this really helped me see where i went wrong
October 9, 2009

physics
A test car starts out from rest on a horizontal circular track of 80m radius and increases it's speed at a uniform rate to reach 27.78 m/s in 10s. Find the magnitude of the total acceleration of the car 8s after the start. Ok so I know that the total acceleration is the ...
October 9, 2009

Physics
I see how this would be correct but the book says the answer is 11.81ft/s and the vertical rise is 2.16 ft
October 4, 2009

physics
yes i measured s0 from point A so it's 0
October 4, 2009

physics
A car is traveling at a constant initial velocity of 100km/h on a level portion of road. It encounters a 6 percent incline (tan(theta)= 6/100) at point A and the car decelerates at a constant rate of gsin(theta). Find the speed of the car (a) 10 seconds after passing point A ...
October 4, 2009

3rd grade
my dauter have a math problem and I dont no how to help her. this is the question: estimate each diffirence using compatible numbers for exc. 53-24=30 the next is 346-78=? we don`t now the answer thank you.Jessi
October 1, 2009

Alegebra 1
can someone please help me asap with this two problems I'm really stuck here. 1) solve for j if b=j+v/2 2) 9r+9s+9
September 21, 2009

physics
yeah the coefficient of static friction is 0.5 and coeffient of kinetic friction is 0.4. theta is measured below the horizontal
September 13, 2009

physics
A block sits against a vertical wall and a 120 lb force P acts diagonally to the left on the block at an angle below the horizontal. Determine the magnitude and direction of the friction force which the vertical wall exerts on the 100 lb block if theta is (a)15 degrees (b)30 ...
September 13, 2009

Geometry
can someone please help me with this question I'm in really need with this question
September 13, 2009

Geometry
I need help asap please Which figure above, if any, is topologically equivalent to the given figure? Identify the topologically equivalent figure by letter. A pretzel a.pencil b.pipe, c.trophy
September 13, 2009

physics
this still isn't the correct answer though. my book says that it's 0.204
September 13, 2009

physics
Each of the four wheels of the vehicle weighs 40 lb and is mounted on a 4in diameter journal. The total weight of the vehicle is 960 lb, including wheels, and is distributed equally on all four wheels. If a force P = 16 lb is required to keep the vehicle rolling at a constant ...
September 13, 2009

Alegebra
So the answer for #1 is 1/35 is that I have to do for that problem though?
September 11, 2009

Alegebra
Ok so I really need help with problem 1 I have no clue
September 11, 2009

Alegebra
#3 I got this answer (20000*.7)-(3000*.3) =14000-900 =$13,100. expected profit Is this right
September 11, 2009

Alegebra
this is what i got from the 2nd problem of the total 7 digits in the number he knows the first 5 that leaves 2 for him to find out with 0 not being the last number so he knows 10 possible for the 6th and 9 possible for the 7th (not 0) 10 * 9 = 90 possible numbers then it takes...
September 11, 2009

Alegebra
Can some one please help me with this 3 problems I have a hard time with probabilities I'm studying for my mid-term. Thank you 1) Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected...
September 11, 2009

physics
thank you so much! it's really clear now with the way you've explained it
August 23, 2009

physics
A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm. A 21.0 kg piston is now lowered into the cylinder, compressing the air trapped inside. Finally, a 79.0 kg man stands on the piston, further compressing the air, which ...
August 23, 2009

physics
A block of unknown mass is attached to a spring with a spring constant of 6.00 N/m and undergoes simple harmonic motion with an amplitude of 12.0 cm. When the block is halfway between its equilibrium position and the end point, its speed is measured to be 33.0 cm/s a)Calculate...
April 27, 2009

Chemistry
How many grams of NaCL are required to make 250ml of a 0.4M solution?
April 21, 2009

Chemistry
There are 200 mmoles NaOH/400ml. What is the molarity of the solution?
April 21, 2009

Chemistry
M=6/600=0.01M?
April 21, 2009

Chemistry
If you had 6 moles in a 600ml of solution, what would be the molarity?
April 21, 2009

Chemistry
What weight of NaOH would be required to prepare 3000ml of a 2.5M solution?
April 21, 2009

Chemistry
What is the molarity of a solution prepared by diluting 100g of NaH2PO4 to 1L?
April 21, 2009

Calculus
Use the dot product to show that the line c = by + ax is perpendicular to vector v = <a,b> They seem like they would be parallel. doesn't c also = <a,b>?
April 15, 2009

Chemistry
How would you prepare 100 ml of 0.9% w/v saline?
April 14, 2009

Chemistry
Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
April 14, 2009

Chemistry
2000/100=150/x =7.5 ml?
April 14, 2009

Chemistry
How many milliliters of a 2000.0 mg/dl stock solution are needed to prepare 100.0 ml of a 150.0 mg/dl working solution?
April 14, 2009

Chemistry
A 2% solution of Hydrochloric acid is required for a procedure. A 5% solution is availabe. How much of the 5% solution will be required to make 1 L of solution?
April 14, 2009

Chemistry
How would you prepare 100 ml of 0.9% w/v saline?
April 14, 2009

Chemistry
Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
April 14, 2009

Chemistry
How many milliliters of a 2000.0 mg/dl stock solution are needed to prepare 100.0 ml of a 150.0 mg/dl working solution?
April 14, 2009

physics
A mass m is attached to a cord passing through a small hole in a frictionless, horizontal surface. The mass is initially orbiting with speed vi in a circle of radius ri. The cord is then slowly pulled from below, and the radius of the circle decreases to r. (Use r_i for ri, ...
April 6, 2009

physics
A straight ladder is leaning against the wall of a house. The ladder has rails 4.50 m long, joined by rungs 4.800 m long. Its bottom end is on solid but sloping ground so that the top of the ladder is 3.400 m to the left of where it should be, and the ladder is unsafe to climb...
March 30, 2009

Chemistry
How many milliliters of glacial acetic acid are needed to prepare 2.0 L of 10.0% volume/volume acetic acid?
March 25, 2009

Chemistry
Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?
March 24, 2009

Chemistry
Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?
March 24, 2009

Chemistry
Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?
March 24, 2009

Chemistry
One liter of 70% alcohol is needed. How much 95% alcohol is required to make the 70% solution. And thank you for last question and any future ones.
March 24, 2009

Chemistry
One liter of 70% alcohol is needed. How much 95% alcohol is required to make the 70% solution. And thank you for last question and any future ones.
March 24, 2009

Chemistry
A 200 mg/dl solution was diluted 1:10. This diluted solution was then additionally diluted 1:5. What us the concentration of the final dilution?
March 24, 2009

physics
An 6.00 g bullet is fired into a 2.30 kg block initially at rest at the edge of a frictionless table of height 1.00 m. The bullet remains in the block, and after impact the block lands 2.00 m from the bottom of the table. Determine the initial speed of the bullet. I know that ...
March 24, 2009

physics
nevermind i figured it out
March 22, 2009

physics
how did you get that the velocity is sqrt(2gH)?
March 22, 2009

physics
Water falls without splashing at a rate of 0.220 L/s from a height of 2.20 m into a 0.720 kg bucket on a scale. If the bucket is originally empty, what does the scale read 3.20 s after water starts to accumulate in it? The answer is supposed to be in Newtons but I don't ...
March 22, 2009

physics
A loaded ore car has a mass of 935 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 26.0° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s ...
March 2, 2009

physics
A block of mass 0.570 kg is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x. The force constant of the spring is 450 N/m. When it is released, the block travels along a frictionless, horizontal surface to point B, the bottom of...
March 2, 2009

Math
Ms. Snyder wants to buy a television at an electronics store. All televisions at the store are 3/4 of the original price, p. She has a $40 discount coupon she will use during the sale. What equation should Ms. Snyder use to find the final price, f, of a television?
February 25, 2009

Math
How do you solve this: A 20-ounce bag of popcorn costs $2,80. If the unit price stays the same, how much does a 35-ounce bag of popcorn cost?
February 25, 2009

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