Saturday

December 3, 2016
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*

**chemistry grade 11 **

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**

(4y + 5) /2 = y + 9? Can you please help me solve this?

*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*

**Physics-Please help-Thank you!!**

Thank you so much-that's what I was doing wrong

*February 8, 2011*

**Physics-Please help**

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 (76)**

none

*February 7, 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*

**Please help! (Calculus)**

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*

**adult education**

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**

what is 7 16th plus 3 8th please help me i am hopeless

*December 16, 2010*

**please help me, physics**

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*