Saturday
December 3, 2016

# Posts by Leah

Total # Posts: 480

Math
John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. a. How much work must be done on the sail? b. If the pulley is 50% efficient, how much work must John do on the rope to lift the sail?
November 3, 2012

Math
A river does 6,500 J of work on a water wheel every second. The wheel's efficiency is 12%. a. How much work in joules can the axle of the wheel do? b. What is the power output of the wheel in 1 s?
November 3, 2012

Physical Science
When you do 100 J of work on the handle of a bicycle pump, the pump does 40 J of work pushing the air into the tire. What is the efficiency of the pump?
November 3, 2012

Math 9
sorry i meant 2.07 m or 207 cm
October 27, 2012

Math 9
so the answer would be 2.07 m or cm
October 27, 2012

Math 9
Please help me on this question. Thanks! One pole measured 1.35m and the smaller pole measured 0.83m. They needed to be tied together. They were attached by overlapping the ends and tying them together. The length of the overlap was 12cm. What is the total length of the new ...
October 27, 2012

Ashford University
Evaluate the ways in which the legacy of slavery has prevented the United States from building a more just society, supporting your evaluation with the textbook and additional sources. Define what Dr. King’s refrain, “free at last,” looks like to you and how our...
October 10, 2012

earth Geology
This is just a question that I was curious about, why do mountain belts run parallel to coastlines? Thanks
September 26, 2012

Physics
At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 5.4 m/s. A player cannot touch the ball until after it reaches its maximum height and begins to fall down. What is the minimum time that a player must wait before touching the ball? I ...
September 23, 2012

A molecule of CHCl3 (chloroform), has the same shape as a molecule of carbon tetrahydride, CH4. But carbon tetrahydride’s boiling point is -164º C and chloroform’s boiling point is 62 ºC. Explain the difference between the boiling points of the two ...
September 21, 2012

English/help
Yesterday I posted three analogies, two I needed to know of they were correct, the other I was lost on, can someone take a look I have to go soon. Is the first one a comparison of Sandra and her fear to that of the kitten?
September 18, 2012

English
I am having trouble with finding the analogy in this one: sandra was sitting in the backyard avoiding the party. she jumped when she heard a noise but it was just a little gray ritten. he look even more scared of her and she was of him. He paused and then walk toward her ...
September 18, 2012

Math
Hi I am not good with math. Please tell me how to differentiate mixed numbers, order of operation,subtraction, divide and multiplication etc. Thanks!
September 14, 2012

health
what is intensity?
September 13, 2012

English 4
It's A.
September 6, 2012

English 4
Which of the following most distinguishes an epic from a mock epic? A. its subject matter B. its style C. its vocabulary D. its length I'm thinking its B.
September 6, 2012

Health
What physical symptoms often accompany social phobia? A. Difficulty talking B. Trembling C. Nausea D. All of the above help me please
August 30, 2012

health
What can spark weight concerns for girls and impact their eating habits in potentially unhealthy ways? A. High self-esteem B. Maintaining a healthy weight C. Peer pressure to look a certain way D. Positive reinforcement from parents about how one looks I need help pleaseee :(
August 3, 2012

chemistry
a current is passed through 500 mL of a solution of CaI2. the following electrode reactions occur: anode: 2I- ---> I2 + 2e- cathode: 2H2O + 2e- ---> H2 + 2OH- after some time, analysis of the solution shows that 35.7 mmol of I2 has been formed. a) how many faradays of ...
June 18, 2012

Math/Trig
How would I evaluate these trig functions without using a calculator? U: sin(-13π/6) cot 11π/6 cot(-14π/4) sec 23π/6 Thanks in advance ^^; and if you'd tell me step by step on how to do problems like these I'd be grateful :D
June 11, 2012

world history
of the Cold War, my bad ;D
June 7, 2012

world history
What are some political, economical, and social effects on the Cold War?
June 7, 2012

Chemistry
Explain how a barometer (mercury barometer) works using the kentic molecular theory
May 31, 2012

Chemistry
It requires 37.0 mL of a sodium hydroxide soltution to neutralize 0.75 grams of phosphoric acid. Using a balanced equation, determine the concentration of the sodium hydroxide solution.
May 21, 2012

geometry
The height of an equilateral triangular prism increases by one unit. The new lateral area is more than the original by how much? Answer the perimeter of the base the area of the base the height the area of one lateral face
May 21, 2012

Physics
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
May 13, 2012

Physics
You are driving your car at a constant speed down the freeway. You are using 42 horsepower to do this. If the air resistance and frictional forces add up to 650 N, what is the net force on your car?
May 13, 2012

Chemistry
A saturated solution of sodium nitrate at 70oC is cooled to 40oC.  How many grams of precipitate are formed?
May 6, 2012

physics
a 15 kg bucket is raised to paint a ladder with an acceleration of 3 m/s.^2 what is the tension in the rope?
April 10, 2012

Math
Verify the identity & Justify the step.s cot (theta-pi/2)=-tan theta
April 10, 2012

Geometry
1. An airplane is flying at 36,000 feet directly above Lincoln, Nebraska. A little later the plane is flying at 28,000 feet directly above Des Moines, Iowa, which is 160 miles from Lincoln. A.assuming a CONSTANT rate of descent, what was the angle of descent? B. What is the ...
March 26, 2012

Math
The perimeter of a regular pentagon is 35in. What is the lenght of one side of the pentagon? Show your work.
February 21, 2012

English
Please help write a reaction on this Article, I want to give good presentation. How can I make it interesting? Thank you! So, far I think the Author is Energy literate and motivates readers through his words. Please tell me how I can include "Energy conversion, Energy ...
February 15, 2012

algebra
If a rocket is launched with an initial velocity of 1600 feet per second when will the rocket be 14400 feet high?
February 7, 2012

chemistry
A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 2.90 atm. The partial pressure of hydrogen is 0.500 atm and the partial pressure of argon is 760. mm Hg. What is the partial pressure of helium?
January 25, 2012

Physics
A person pushes a 11.0 kg lawn mower at constant speed with a force of 76.0 N directed along the handle, which is at an angle of è = 41.0° to the horizontal. Calculate the normal force exerted vertically upward on the mower by the ground. Calculate the force the ...
November 28, 2011

Physics
A heavy-duty stapling gun uses a 0.162-kg metal rod that rams against the staple to eject it. The rod is pushed by a stiff spring called a "ram spring" (k = 32657 N/m). The mass of this spring may be ignored. Squeezing the handle of the gun first compresses the ram ...
November 13, 2011

Physics
A constant torque of 27.2 N · m is applied to a grindstone for which the moment of inertia is 0.158 kg · m2. Find the angular speed after the grindstone has made 18 rev. Assume the grindstone starts from rest. Answer in units of rad/s
November 11, 2011

algebra
On the day a child was born, a lump sum P was deposited in a trust fund paying 6.5% interest compounded continuously. Use the balance A of the fund on the child's 29th birthday to find P. (Round your answer to the nearest cent.) A = \$5,000,000 P = \$1
November 1, 2011

English Lit
Thanks for the great definitions- Do you think I was right on either of them? The first question slant rhyme and the secondcaesura?
October 7, 2011

English Lit
I have two questions about these Emily Dickinson's "Wild Night" 1.Which best describes the rhyme in the second stanza--internal rhyme,slant rhyme,feminine rhyme,descending rhyme or no rhyme Would it be slant rhyme? 2.Which is the following sound device used in ...
October 7, 2011

penn foster world history
i hope someone can help me as well.
October 6, 2011

Pre-Calculus
Thank you
October 3, 2011

Pre-Calculus
Can you show me how to find the rectangular equation: r=2cos(theta) + 3 sin (theta) All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you
October 3, 2011

Pre-Calc
Can you show me how to find the rectangular equation of r=2costheta + 3 sin theta All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you
October 3, 2011

math
A pair of sneakers cost s dollars. A pair of socks costs k dollars. If the store charges 5% sales tax, write an expression for the cost of one pair of socks and one pair of sneakers.
October 1, 2011

Math
Jan is on year younger than her brother Bill and on year older then her sister Sue. The sun of the three children ages is 57. How old is each child.k
September 27, 2011

math
Posted by kathy on Monday, September 26, 2011 at 8:05pm. 1.the square og 2 is the same as two times the difference of g and 10. 2. the product of 3 and the square of g equals the sum of thirty and the product of nine and g. i really need help on this i don't get it. thanks
September 26, 2011

Physics
A book is moved once around the edge of a tabletop with dimensions 1.75m x 2.25m. If the book ends up at the initial position, what is its displacement? If it completes its motions in 23s, what is its average velocity? What is its average speed?
August 28, 2011

Biomechanics
How do you compute the additional work done after a stretch-chorten cycle?
August 5, 2011

math
A transformation T : (x, y) (x + 3, y + 1). The image of B(4, 1) under this transformation is
July 18, 2011

Accounting
purchased dental equipment at 15,000 and invested cash of 500,000
July 17, 2011

math
A transformation T : (x, y) (x + 3, y + 1). The image of B(4, 1) is
July 17, 2011

math
Indicate the equation of the line that is the perpendicular bisector of the segment with endpoints (4, 1) and (2, -5).
July 8, 2011

math
The slope of a line that is perpendicular to a line whose slope is -2/7 is
July 8, 2011

geometry
Indicate the equation of the line through (2, -4) and having slope of 3/5.
July 7, 2011

geometry
In rectangle ABCD, if the coordinates of A are (0, 0) and the coordinates of C are (r, s), find the coordinates of B.With A and D being on the bottom line and B and C on the top with B over A.
July 6, 2011

math
In rectangle ABCD, if the coordinates of A are (0, 0) and the coordinates of C are (r, s), find the coordinates of B.With A and D being on the bottom line and B and C on the top with B over A.
July 5, 2011

Chemistry
What type(s) of intermolecular forces allow CO2 to dissolve in water? Do CO2 and H2O have a relatively strong or weak attraction to one another? Explain. Please and thank you!!
June 5, 2011

math
a government bod pays 100 in a year at a discount rate of 5%(assume simple interest). How much did the bond cost? What is the annual percentage rate? Should it be more or less than 5%?
June 2, 2011

writing
Compare and contrast your abilities as an academic writer now as opposed to when you began your studies at the University. Using four comparatives and four superlatives within your responses, explain what has led to these changes and what changes you will make in the future.
May 31, 2011

simplex Method
A company manufactures two products, A and B, on two machines, I and II. It has been determined that the company will realize a profit of \$3/unit of product A and a profit of \$4/unit of product B. To manufacture 1 unit of product A requires 6 min on machine I and 5 min on ...
April 24, 2011

Simplex Method
Solve the linear programming problem by the simplex method. Maximize P = 27x + 27y + 36z subject to x + y + 3z < 15 4x + 4y + 3z < 65 x > 0, y > 0, z > 0 x + y = z = P =
April 24, 2011

simplex Method
Solve the linear programming problem by the simplex method. Maximize P = 5x + 4y subject to 3x + 5y < 78 4x + y < 36 x > 0, y > 0 x = y = P =
April 24, 2011

Simplex Method
Solve the linear programming problem by the simplex method. Maximize P = 10x + 6y subject to x + y < 80 3x < 90 x > 0, y > 0 x = y = P =
April 24, 2011

geometry
The perimeter of a triangle ABC is 58cm.The base of the right triangle is 17 cm. What is th area of the right triangle and how do you figure it out?
April 20, 2011

HELPPP
Solve the linear programming problem by the method of corners. Minimize C = 5x + y subject to x + 3y ≥ 43 x + y ≥ 27 x ≥ 0, y ≥ 0
April 18, 2011

math
Maximize P = 2x − 3y subject to x + 2y ≤ 14 6x + y ≤ 18 x ≥ 0, y ≥ 0
April 18, 2011

Chemistry
when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution
April 17, 2011

Math
Which of the flowing formulas a correct rewriting of the formula a=6b - 12? A. b= a- 12/6 B. b= a + 12/6 C. b= a/6 + 12 D. b= 6a - 12
April 13, 2011

math
Formulate a system of equations for the situation below and solve. A theater has a seating capacity of 660 and charges \$2 for children, \$4 for students, and \$6 for adults. At a certain screening with full attendance, there were half as many adults as children and students ...
March 28, 2011

math
Pivot the system about the element in row 2, column 1. –5 5 –7 10 4 4
March 28, 2011

math
pivot the system about the element in row 2, column 1: -5 5 l -7 10 4 l 4
March 27, 2011

Chemistry
A solution contains a mixture of Cl- and Br- ions. Can both be positively identified? Briefly explain and write appropriate equations to support your answer.
March 23, 2011

math
A = _,b = 12yd,h = 16 yd
March 15, 2011

math
what is A = 37.5 cm 2,b = 8 in.;h =
March 15, 2011

chemistry
a certain solution contains 0.35 mol of HCl in 1200 mL of water. What is the pH of the solution?
March 7, 2011

Math
March 3, 2011

maths
Chris wants to put a concrete path and a fence around his rectangular garden. The concrete path will be 1 meter wide and the fence will go around the edge of the path. The garden itself measures 5meter by 8 meters. A) calculate the perimeter of thr fence. B)Calculate the area ...
February 24, 2011

math
A music store offers a prize to a computer who can guess the closest, the number of jelly beans that fill a litre jar on the counter. Estimate the number of jelly beans in the jar if 1 jelly bean is approximately 2cm long (h) by 1.5cm in diameter(d)
February 24, 2011

Math
Space C has a base of 20 feet and a height of 24 feet and the two sides are both 26 feet (it is a parrallogram).... Space c will be tiled and used for an eating area. Each tile measures 1 square foot and cost \$2. How much will it cost to tile the floor?
February 22, 2011

Math
You want to estimate the mean amount spent by customers at a local gas station with 98% confidence and a margin of error of no more than \$2. Preliminary data suggests that the standard dev. is \$5.1 is a reasonable estimate for the standard dev. for all customers. How large a ...
February 19, 2011

Thank you so much-that's what I was doing wrong
February 8, 2011

Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help
February 8, 2011

Physics nd the TI84 Calculator
Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help
February 8, 2011

Physics help on the TI-84 calculator
Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help
February 8, 2011

Physics
Gind the force between charges of +10.o uC and -50.0 uC located 20.0 cm apart
February 6, 2011

math
how many times must the number 5 be subtracted to find the quotient of 5/5?
February 2, 2011

Solve initial value problem explicitly: 1. y'= ye^-x, y(0)=1 2. y'= 5xe^-y, y(1)=1
February 2, 2011

Math
Are the differential equations separable or not? 1. y'= ye^(x+y) 2. y'= ye^(xy) 3. y'= y(xcos(y)) If they are, could you show how? Any help, even on one, would be extremely appreciated!
February 2, 2011

geometry
Two circles of equal radius intersect each other such that each circle passes through the center of the other circle. Find the equation for the perimeter of this figure.
February 1, 2011

Physics
A 5.0g silver spoon at 20.0C is placed in a cup of coffee at 90.0C. How much heat does the spoon absorb from the coffee to reach a temperature of 89.0C?
January 31, 2011

Physics
A 5.0g silver spoon at 20.0C is placed in a cup of coffee at 90.0C. How much heat does the spoon absorb from the coffee to reach a temperature of 89.0C?
January 31, 2011

Pre-Algebra Math
A bank teller is counting his money and notices that he has an equal number of tens and twenties. He also had \$147 in other bills. If the total value of the bills he has is \$1,167, how many tens and twenties does he have What would be the equation in algebra?
January 27, 2011

Why does the chosen developmental theorist appeal to you? Relate the chosen theory to a recent or upcoming developmental stage or phase in your own life.
January 27, 2011

math
December 16, 2010

Five moles of a monatomic ideal gas expand adiabatically, and its temperature decreases from 410 to 200 K. (a) What is the work done by (or done to) the gas? Include the algebraic sign. J (b) What is the change in the internal energy of the gas? Include the algebraic sign. J
December 10, 2010

physics
would it be .55 converted to g times cg of aluminum which according to the link is .90 time the differnece in T which is 660-180
December 10, 2010

Math
A triangle with two congruent sides and two angles that both mesuare 45 is a. scalence and right b. isosceles and acute c. isosceles and right d.equilateral and acute
December 5, 2010

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