Monday

August 29, 2016
Total # Posts: 2,320

**Calculus Optimization**

A model space shuttle is propelled into the air and is described by the equation y=-x^2/2e + ex (in 1000 ft), where y is its height above the ground. What is the maximum height that the shuttle reaches?
*January 18, 2011*

**Calculus Optimization**

A model space shuttle is propelled into the air and is described by the equation y=(-x2/2e)+ex in 1000 ft, where y is its height in feet above the ground. What is the maximum height that the shuttle reaches?
*January 18, 2011*

**Physics - Re-post**

A .20 kg ball is attached to a vertical spring. The spring constant is 28 N/m. The ball is supported initially so that the spring is neither stretched or compressed, is released from rest. How far does the ball fall before brought to a momentary stop by the spring? Our teacher...
*January 18, 2011*

**Math**

the perimeter of parallelogram is 52cm,and jk is 2cm longer than jm. find jk find jm
*January 17, 2011*

**math**

what do you write when you describe a way to compare two fractions when the denominators are the same
*January 11, 2011*

**math**

what do you write when you have to describe a way to compare two fractions when the denominators are the same
*January 11, 2011*

**Physics-Help, confused!**

A .20 kg ball is attached to a vertical spring. The spring constant is 28 N/m. The ball is supported initially so that the spring is neither stretched or compressed, is released from rest. How far does the ball fall before brought to a momentary stop by the spring? Our teacher...
*January 10, 2011*

**math**

cubic yardage in a 1.5 to 1 slope with triangle type curves
*January 7, 2011*

**chemistry**

how many ml of water at 10 degrees celsius must be added to 75 ml of water at 35 degrees celsius to obtain a final temperature of 19 degrees celsius?
*January 4, 2011*

**5th grade math**

6 whole in 3 whole two thrids as a simplest from
*January 3, 2011*

**Writing**

How do you write a personal statement for a college scholarship?
*December 29, 2010*

**AP calculus AB**

A spy tracks a rocket through a telescope to determine its velocity. The rocket is traveling vertically from a launching pad located 10 km away. At a certain moment, the spy's instruments show that the angle between the telescope and the ground is equal to pi/3 and is ...
*December 29, 2010*

**AP calculus AB**

Water pours out of a conical tank of height 10 feet and radius 4 feet at a rate of 10 cubic feet per minute. How fast is the water level changing when it is 5 feet high?
*December 29, 2010*

**AP calculus AB**

A balloon is being filled with air at a rate of 3 cubic meters per minute. Find the rate at which the radius is changing when the volume is 36 pi cubic meters.
*December 29, 2010*

**AP calculus AB**

At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 9 pi cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant.
*December 29, 2010*

**AP calculus AB**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters.
*December 29, 2010*

**grammar**

What is the verb and helping verb of this sentence. Mary was studying for the test.
*December 15, 2010*

**statistics**

can you do the problm out so i know how you got these numbers? Thanks
*December 14, 2010*

**Art**

I have to write a 400 word essay on M.C. Escher about my thoughts and opinons based upon his work, quotes, and his life. Does anybody know of a good website that will give me some ideas? FYI- THIS IS NOT A BIOGRAPHY ESSAY! -Thanks
*December 14, 2010*

**english**

i got this answers i dont know if their write though 1.c logos 2.c.logos 3.b. pathos
*December 13, 2010*

**english**

1. The element of argumentation that deals with the listeners desire to trust and believe in the speaker is called a. ethos b. pathos c. logos d. mythos One element of argumentation involves an appeal to the logical and rational side of human beings. This element is called a. ...
*December 13, 2010*

**Chemistry **

What is the difference between a ground state electrom configurationa dn a final electon configuration?
*December 12, 2010*

**Chemistry**

What happens to an electron when a photon hits it?
*December 12, 2010*

**Chemistry **

What element has the final electron configuration as 3s2 3p4?
*December 12, 2010*

**Chemistry**

thank you!!!
*December 12, 2010*

**Chemistry**

What is the electron configuration of 3s23p4?
*December 12, 2010*

**Physics**

Yes, just like a seesaw! Ditto! :-)
*December 12, 2010*

**Physics**

1. If you think of the pivot point as the center of a clock, the forces on the left would be going in a counter-clockwise motion whereas the forces on the right would be going in a clockwise motion. The counter-clockwise motion is positive and the clockwise motion is negative...
*December 12, 2010*

**Physics**

CCT is Counter-Clockwise Torque CT is Clockwise Torque These two must equal each other in order for equilibrium to exist. It is the same as saying: The sum of the Torques = 0 The sum of the torques meaning the counter clockwise torques minus the clockwise torques = 0. Does ...
*December 12, 2010*

**Physics**

1. Two coins stacked at 7 cm mark is (2)(5g)=10g 2. Choose pivot at 41 cm, because that's where it's balanced. 3. Then, CCT=CT CCT would be the weight of the coins at the 7 cm mark times the distance from the pivot. CT would be the weight of the meter stick (M), which ...
*December 12, 2010*

**Physics - Hellp Really Stuck!**

1. A 0.20 kg object moves at a constant speed in a horizontal circular path of radius "r" while suspended from the top of a pole by a string of length 1.2 m. It makes an angle of 62 degrees with the horizontal. What is the speed of this object? 2. An object of mass 3...
*December 11, 2010*

**math**

4 ft 9 in 13 ft 9 in 4 ft 3 in Gives 21 ft 21 in Since 12 inches make a foot, 21 in - 12 in = 9 in Add another ft and keep the remaining inches The total length needed is: 22 ft 9 in
*December 11, 2010*

**exam study math guide CRUICAL**

Julie's score = 100 Sara's score = x Anne's score = x + 10 Average = 72 = total of all scores / 3 72 = (100 + x + (x + 10)) / 3 72 = (100 + 2x + 10) / 3 216 = 110 + 2x x = 53 Sara's score = x = 53 Anne's score = x + 10 = 63 Double check: (100 + 53 + 63) / 3...
*December 11, 2010*

**Chemistry**

Which of the following oxides yield an acidic solution when dissolved into water? P4O10 Na2O ClO7 Fe2O3 Thanks for any help.
*December 11, 2010*

**Math**

Put the equation in the form y = mx + b -6y = -3x + 12 y = (1/2)x - 2 Slope = m = 1/2 y intercept = (0,b) = (0, -2)
*December 11, 2010*

**physics**

A ball has a mass of 0.14 kg and is pitched w/ velocity of 38 m/s. The batter hits the ball & departs w/ a velocity of 58 m/s. Contact time b/w the bat and ball is 4.0 x 10-3seconds. What is avg force exerted on ball?
*December 11, 2010*

**Physics**

Hi drwls: I had a question about this one. Don't we have to convert the weights into newtons for this problem and the distance to meters since torque is in Nm?
*December 8, 2010*

**Physics**

A 10N meterstick is suspended by two sping scales, one at the .08 m mark and the other at the .9 m mark. If a weight of 5N is hung at the .2 m mark and a weight of 17N is hung at the .55 m mark, what will be the reading on each scale? I have: F(_1)+F(_2)=5+10+17=32 With moment...
*December 8, 2010*

**Physics**

Thanks Quidditch!
*December 7, 2010*

**Physics**

A 30 N fishing pole is 2.00 m long and has its center of gravity .350 m from the heavy end. A fisherman holds the end of the pole in his left hand as he lifts a 100 N fish. If his right hand is .800 m from the heavy end, how much force does he have to exert to maintain ...
*December 7, 2010*

**Physics 40**

A pendulum bob of mass M1 oscillates with a period of 1.0 s. If the length of the pendulum remains the same, but the pendulum bob is replaced with another one of mass M2 = 2*M1, what is the new period? I need help.
*December 7, 2010*

**math**

-17+5 -12
*December 7, 2010*

**math**

-17+5 -12
*December 7, 2010*

**MATh**

Sorry, hit the wrong key: (1/2)(36)=$18.00
*December 6, 2010*

**MATh**

First find out how much of her allowance she earned washing dishes and cleaning her room: (1/3)+(1/6) (Find LCD) =(2/6)+(1/6) =3/6 =1/2 So if 1/2 of her allowance is earned washing dishes and cleaning her room, then the other 1/2 of her allowance is earned doing other things. ...
*December 6, 2010*

**Physics**

Thanks drwls!
*December 6, 2010*

**Physics**

I followed up to this point: F = M (12.8 - 9.8) = M* 3 m/s^2. I do not understand why we must divide by g (9.8).
*December 6, 2010*

**Physics**

Forgive my ignorance, but how do I find the mass when I do not know the seat force?
*December 6, 2010*

**Physics**

A loop-the-loop ride at an amusement park has a radius of 5 m. At the highest point, the rider moves at 8 m/s. At the lowest point the rider moves at 13 m/s. Find what you would feel like you weigh at those points. (This force represents the force of the seat against your rear...
*December 6, 2010*

**math**

The formula for the circumference of a circle is C=2(pi)r. If we divide both sides by 2(pi) we have: C/2(pi)=r Substituting 29 for C we have: 29/2(pi)=r and therefore the correct answer would be "g."
*December 6, 2010*

**algebra**

I'm not sure what you mean by solving it wrong, as you...don't appear to be solving it at all? Are you supposed to be finding the x-intercepts? The graph of this function is a parabola, with vertex at (-h, k). You can find this vertex from the form y = a(x-h)^2 + k. So...
*December 6, 2010*

**geometry**

Let r=AB. Since we were given AC=12 and angle B=60, we can use: sin 60 = 12/r Solving for r we have: r = 12/sin 60 = 13.86
*December 5, 2010*

**Physics HELP!**

So then assuming the swing is uniform, do I have: T1 + T2 = 650 + 490 + 150 = 1290 N Then, T1*1.7 -0.95*650 - 0.5*490 -.85*150 = 0 Solve for T1 and then use the first equation to solve for T2?
*December 5, 2010*

**Physics HELP!**

Shouldn't we consider the weight of the swing as well?
*December 5, 2010*

**Physics HELP!**

A 650 N boy and a 490 N girl sit on a 150 N porch swing that is 1.70 m long. If the swing is supported by a chain at each end, what is the tension in each chain when the boy sits .75 m from one end and the girl .5 m from the other end?
*December 5, 2010*

**algebra**

1-5=-4m^2 -4=-4m^2 Dividing by -4 on both sides we have: (-4)/(-4)=(-4m^2)/(-4) 1=m^2 Take the square root of both sides we have: sqrt(1)=sqrt(m^2) 1=m or m=1 Hope this helps.
*December 5, 2010*

**College Chem**

Thank you, we were doing, n=VRT P
*November 29, 2010*

**College Chem**

We did that and somehow got the wrong answer. can you please give me a step by step? Thank you...
*November 29, 2010*

**College Chem**

A diver exhales a bubble with a volume of 25 mL at a pressure of 2.4 atm and a temperature of 15 degrees C. how many gas particles are in this bubble?
*November 29, 2010*

**chemistry**

200
*November 29, 2010*

**Chemistry**

4.745 eq. of magnesium will displace how many grams of silver from a silver nitrate solution? I have written the equation as follows: Mg + 2AgNO3 = Mg(NO3)2 + 2Ag I'm not sure how to proceed with converting the 4.745 eq. Any help would be appreciated.
*November 28, 2010*

**chemistry**

New to working with equivalent weights. Any help would be appreciated. A metal weighing 4.0080 g formed 4.1002 g of hydride. What is the equivalent weight of the metal?
*November 28, 2010*

**physics**

A ball is thrown straight upward and returns to the thrower's hand after 2.20 s in the air. A second ball is thrown at an angle of 31.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
*November 18, 2010*

**Physics**

A typical coal-fired power plant burns 310 metric tons of coal every hour to generate 790 MW of electricity. 1 metric ton= 1000 kg. The density of coal is 1500 {\rm kg}/{\rm m}^{3} and its heat of combustion is 28 \;\rm MJ/kg. Assume that all heat is transferred from the fuel ...
*November 17, 2010*

**math**

Let π denote the proportion of grocery store customers that use the store's club card. For a large sample z test of H0: π = .5 versus Ha: π > .5, find the P-value associated with each of the given below values of the test statistic.
*November 16, 2010*

**managerial accounting**

The following direct materials and direct labor data pertain to the operations of Solario Manufacturing Company for the month of August Costs Quantities Actual labor rate $13 per hour Actual hours incurred and used 4,200 hours Actual materials price $128 per ton Actual ...
*November 15, 2010*

**physics**

An arrow is shot horizontally off a 100 m high building. A target is dangled from a rope 204 m away. How far off the ground do you have to dangle the target from the arrow to hit it?
*November 14, 2010*

**physics**

A 1.2 kg cannon ball is shot off a platform (1) at 10 m/s. It hits a platform (2) and begins to roll without bouncing. The coefficient of friction between platform (2) and the ball is .3. How far does the ball land from platform (2)? How long does it take to hit the ground?
*November 13, 2010*

**Chemistry**

I always have trouble with making an hypothesis for a lab. I was wondering if someone can help me come up with a hypothesis for a formation of salt lab. Thanks!
*November 13, 2010*

**2nd grade**

what is a vertex?
*November 11, 2010*

**Art**

What atrists, styles and events did Pierre Auguste Renoir have influences on?
*November 11, 2010*

**applied physics**

an airplane is heading due west at a velocity of 500 miles/hr. There is a cross wind due North at a velocity of 50 miles/hr. find the airplanes velocity relative to the ground (magnitude and direction)
*November 11, 2010*

**accounting**

You have been asked to speak at a career fair for high school students in your home town. Specifically, you are making a presentation about your role as an accountant. •Describe for the students the primary objectives of accounting. •Explain the basic terminology of ...
*November 7, 2010*

**physics**

Ugh. I just got this as part of a lab question. It makes no sense what-so-ever in context. NEVER TAKE ONLINE PHYSICS IN HIGHSCHOOL!!! Lol.
*November 6, 2010*

**8th grade**

A store that personalizes shirts chargers $20 for a shirt plus $.75 for each letter. Write an algebraic expression for the cost os "t" shirts using "n" letter each.
*November 5, 2010*

**math**

what is the pattern 17- - 62 - 92
*November 3, 2010*

**Physics**

If a 1-kg mass fell toward Earth from a large distance where it had zero relative velocity, what would be the velocity at the Earth's surface?
*November 3, 2010*

**math**

its a function table input|output -3 | 7 0 | 1 3 |-5 8 |-15
*November 2, 2010*

**ethics**

How did slavery influence the evolution of both Back and White America today?
*November 1, 2010*

**Physics**

A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. The painter has a mass of 75 kg and the mass of the platform is 20.0 kg. The distance from the left end of the platform to where the ...
*October 28, 2010*

**adult education**

I need help with someone to go over my eassy with me can someone please help me.This is my first time using this site so I don't know how it really works SOMEONE PLEASE HELP ME!!
*October 27, 2010*

**Science**

PLEASE HELP Science Test Friday Study Guide? I have 1 to 22 already but I am stuck now I have to have this completed and correctly for my study guide. I have a C right now I need an A on this test to bring it up to a B or I stay on restriction please help I have been on ...
*October 26, 2010*

**Science**

I have worked the answers out only Im not sure if they are correct this is what i got. and I need them correct for me to be able to use this study guide 22. G 23. H 24. C 25. J 26. A 27. I 28. E 29. D 30. F 31. B 32. False 33. True 34. True 35. True 36 I already posted what I ...
*October 26, 2010*

**Science**

PLEASE HELP Science Test Friday Study Guide? I have 1 to 22 already but I am stuck now I have to have this completed and correctly for my study guide. I have a C right now I need an A on this test to bring it up to a B or I stay on restriction please help I have been on ...
*October 26, 2010*

**English**

I need help doing the general reference for this sentence. Clarissa's four-year-old sister brought a frog inside and let it loose, which made Clarissa shriek.
*October 25, 2010*

**Chemistry**

Consider the concentration of the final solution made in two volumetric flasks. In flask A the liquid was filled to a level above the mark. In flask B the liquid was filled to a level below the mark. Describe if the final concentration of the diluted specie will be higher or ...
*October 25, 2010*

**Physics**

a plane flying at 90 degrees and 100 ms is blown toward 180 degrees at 50 ms. What is the resultant velocity and direction?
*October 25, 2010*

**Physics**

How do u know the mass?
*October 24, 2010*

**Physics**

A stone is tied to a string (length = 0.450 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...
*October 24, 2010*

**Chemistry**

Would this sound reasonable? If I test substances, then I will be able to identify the physcial and chemical changes.
*October 23, 2010*

**Chemistry**

What would be a good hypothesis for a lab in which the purpose is to identify the differences between chemical and physical changes.
*October 23, 2010*

**Physics **

A skier is gliding along at 5.0m/s on horizontal, frictionless snow. He suddenly starts down a 13 degrees incline. His speed at the bottom is 12m/s. What is the length of the incline? How long does it take him to reach the bottom?
*October 22, 2010*

**Chemistry**

If aluminum hydroxide -Al(OH)3- is an acid, why does it end with hydroxide instead of beginning with hydrogen?
*October 22, 2010*

**Science**

If CH3COOH is an acid, shouldn't it begin with hydrogen instead of ending with it?
*October 22, 2010*

**English**

Can a rough draft for a letter of application or cover letter be written front and back? Also how many lines do you skip for each topic. Thanks!
*October 21, 2010*

**Physics**

A motorboat is traveling 5m/s East, and encounters a current traveling 2.5m/s, North. If the witdth of the river is 80m wide, how much time does it take the boat to reach the other shore. I understand how to calculate the resulatant velocity, but I dont understand why you use ...
*October 20, 2010*

**Chemistry**

Determine the type of radiation: a frequency of 5.6 mhz
*October 19, 2010*

**english**

well i said the scene makes malvolio look bad infront of olivia and gives iniciative for sir.toby to act against malvolio making people believe that he is crazy and plans to put him in a dark room. but my teacher said i was summarizing and not explaining.. so what should i write?
*October 18, 2010*

**english**

what issues does the scene raise? act.3.sc.4. lines 1-150 in the book twelfth night by shakespeare
*October 18, 2010*

**math**

the perimeter of a rectangle is 147 meters the length is 15 meters less than 5 times the width find the dimension
*October 17, 2010*