# Posts by emily

Total # Posts: 2,963

**Calculus**

Find the derivative of y = ln |cos(ln)|. I got -tan(ln x)/x, is this correct?

*February 22, 2012*

**Physics**

if a force of 163 newtons is applied to the end of the jack handle the end moves down 15 cm. If lifting part of the jac raises the car bumper 1.75 cm what force is the jack exerting on the bumper

*February 17, 2012*

**College Chemistry**

How much Ca(OH)2 is required to remove 90.0% of PO4^-3 from 7.5 times 10^6 L of drinking water containing 25 mg/l of PO4^-3?

*February 17, 2012*

**Chemistry**

How many milliliters of .100 M HNO3 are needed to neutralize 58.5 mL of .0100 Al(0H)3?

*February 17, 2012*

**math**

If there are 75 animals in a pet store and a pie graph shows 16% are cats how many of the animals are cats

*February 14, 2012*

**Physics**

A 80.0 N box of is pulled 20.0 m up a 30.0 Degree ramp by a force of 115 N, if the coefficient of kinetic friction between the box and the ramp is .22 what is the box's kinetic energy?

*February 14, 2012*

**chemistry**

Thanks dude

*February 13, 2012*

**chemistry**

The absorbance reading of an element is observed in an atomic absorption spectrometer. Would the readings increase, decrease or stay the same if: (please explain) Thank you a) viscosity of the solution increased or decreased? b) the solution had a lot of dust particles? c) the...

*February 13, 2012*

**physics**

A string connecting a car of mass x1 on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain I think that the car will still undergo constant acceleration, the ...

*February 11, 2012*

**physics**

A string connecting a car of a certain mass, x1, on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain. I think it will still undergo a constant acceleration, ...

*February 11, 2012*

**physics**

A string connecting a car of a certain mass, x1, on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain. I think it will still undergo a constant acceleration, ...

*February 11, 2012*

**try this**

what song is this from: Everybody seems to look at you, Its not because your different, its just because your so scay cool, the sinister style---------------, you dropped it gorgeous, dropped it gorgeous, that's where the cool kids rule!

*February 10, 2012*

**TO WRITEACHER**

i'm looking for steps to write a summary

*February 9, 2012*

**TO WRITEACHER**

it didn't help!

*February 9, 2012*

**HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

I need help on writing a summary and an example of a summary.My teacher said that when your writing a summary,the middle is the 3 supporting details or what happens,the end is what wraps it all up or the conclusion.but what is the beginning? PLEASE, I NEED HELP, MY ASSIGNMENT ...

*February 9, 2012*

**Chemistry**

Thanks so much :)

*February 9, 2012*

**Chemistry**

Consider the following hypothetical aqueous reaction: A (aq)-->B(aq)}. A flask is charged with 0.065 (mole) of A in a total volume of 100.0 (mL}. The following data are collected: Time (min) 0 10 20 30 40 Moles of A .065 .051 .042 .035 .031 Calculate the average rate of ...

*February 9, 2012*

**trig**

Find sin t,cos t and tan t when the terminal side of an angle of t radians passes through ( -3/5 , -4/5) on the unit circle.

*February 8, 2012*

**geometry**

If triangle has vertices A(7,-3), B(-1,5), and C(4,-8), what is the length, in simplest radical form, of the median from C to AB?

*February 7, 2012*

**Calculus**

Sorry, I forgot one: w) lim (1-2cos^2x)/(cosx-sinx) as x->π/4

*February 7, 2012*

**Calculus**

uu) lim ln(1-x) as x->1- yy) lim (√(6-x)-2)/(√(3-x)-1) as x-> 2 zz) lim (1-(1/2)arctanx) as x->-∞ bbb) lim ln|1-x| as x->1 If these are hard to interpret with all the parentheses, you can plug them in to Wolfram Alpha and it interprets them ...

*February 7, 2012*

**Physics**

An open tube of length L = 1.60 m and cross-sectional area A = 4.60 cm2 is fixed to the top of a cylindrical barrel of diameter D = 1.27 m and height H = 2.16 m. The barrel and tube are filled with water (to the top of the tube). Calculate the ratio of the hydrostatic force on...

*February 6, 2012*

**physics**

A 39-kg girl standing at rest on slippery (frictionless) ice throws a 10-g ball forward with a speed of 10 m/s. Just afterward, the girl will

*February 3, 2012*

**Physics**

In a 100 m race, Maggie and Judy cross the finish line in a dead heat, both taking 10.6 s. Accelerating uniformly, Maggie took 2.20 s and Judy 2.90 s to attain maximum speed, which they maintained for the rest of the race. A) What was Maggie's acceleration? B) What was ...

*February 2, 2012*

**physics**

A 5.50 bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 77.0 . If the bucket starts from rest, what is the minimum time required to raise the bucket a vertical distance of 14.0 without breaking the cord?

*February 1, 2012*

**Calc 3**

if r= <x,y,z> and r_0= <x_0,y_0,z_0>, describe the set of all points (x,y,z) such that magnitude[r-r_0]=4

*January 31, 2012*

**Math**

when he sits on the throne

*January 31, 2012*

**Calculus I**

Reading these answers makes a whole lot more sense after a night's sleep, haha. Thank you so much!

*January 30, 2012*

**Calculus I**

We're reviewing limits from the previous chapter, but I'm still having some difficulty with some problems: lim tan(pi(x/4)) as x-> -7 lim (x^2 - x^3(cos(1/x))/3x^2 as x-> 0 I know the answer to the first problem is 1 and to the second problem it's 1/3 but I&#...

*January 30, 2012*

**Calculus**

Since f is a polynomial, it is continuous in the interval [0,1]. f(0) = 3 f(1) = 9 Therefore, for every value of k in the interval [3,9] there is a c in the interval [0,1] such that f(c)=k.

*January 30, 2012*

**English Lit**

okay-thank you-I'll try again

*January 29, 2012*

**English Lit**

I have a question about Henry II. What did he do that solidified his power as king but led to economic problems and helped incite conflict with the church. The possible answers are: Executed all Bishops who were opposed to his rule Gave enormous finiacial gifts to the nobility...

*January 29, 2012*

**SIMILARITY**

WHAT ARE THE SIMILARITIES OF A PARK AND A PLAYGROUND?

*January 29, 2012*

**SOSO**

okay! but what are the similarities

*January 29, 2012*

**SOSO**

okay. THEY ARE DIFFERENT BECAUSE A PLAYGROUND IS A PLACE WITH SLIDES,SWINGS,MONKEY BARS,AND SEE-SAW WHERE KIDS CAN PLAY.A PARK IS AN OPEN AREA WITH BENCHES AND PONDS WHERE THERE IS A LOT OF FREE ROOM TO RUN.

*January 29, 2012*

**SOSO**

what ARE the similarites and differences between parks and playgrounds!

*January 29, 2012*

**Physics**

A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.30 s after her feet first touch the water, what average upward force did the water exert on her? I'm not sure how ...

*January 29, 2012*

**Physics**

How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.

*January 28, 2012*

**Physics**

How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.

*January 28, 2012*

**Physics**

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?

*January 25, 2012*

**Physics**

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?

*January 25, 2012*

**Physics**

A hunter wishes to cross a river that is 1.6 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?

*January 19, 2012*

**Physics Please Check over my answers!**

TwinWin got it right. 100% correct.

*January 17, 2012*

**physics**

a car rolls off a cliff and lands 15m from the base. if the cliff was 22m high, how fast was the car going? show work.

*January 15, 2012*

**physics**

A 20000 kg airplane takes off by traveling 300 m down a runway while the engines exert a continuous force of 4000 N.(a) Calculate the change in kinetic energy of the airplane during takeoff.(b) Determine the speed of the airplane as it leaves the runway.

*January 13, 2012*

**HELP**

okeedokey

*January 12, 2012*

**HELP**

i need a printable protractor

*January 12, 2012*

**Science**

how is it possible to figure out a science problem like this EXAMPLE:s=2m*6Hz=2m*6(1/s)=12m/s if they don't tell you what the letters mean?

*January 10, 2012*

**Geometry**

MO bisects <LMN,m<NMO=(6x+19)°,andm<LMO=(9x-14)°. Solve for x and find <LMN.

*January 9, 2012*

**Physics**

644 lbs

*January 5, 2012*

**math**

kano's college is 1200 miles away.he drives 300 miles each day.how long will it take him to get to college? _______________________________________ days / miles per day /miles in all _______________________________________ 5 / 300 /1500 300*5 =1500 is the number model write?

*January 5, 2012*

**stuff**

is figure skating all season

*January 5, 2012*

**math**

How many 8 by 10 inch tiles fit on a 16 by 20 ft floor ?

*January 4, 2012*

**math**

what do the numbers 8/10,0.75,0.2 and 2/5 look like in order from least t greatest?

*January 3, 2012*

**chemistry**

don't know don't care

*January 3, 2012*

**Math**

A total number of 121 people came to the school science fair this year. This number is 7 MORE than TWICE the number of people who came last year's science fair. How many people came last year?

*December 20, 2011*

**earth**

what factors contribute to the formation of fertile, deep topsoil in temperate regions?

*December 18, 2011*

**Physics**

James's tug of war team pulls with 500N of force to the right wile Jake's team pulls with 415N to the left. If James's team weighs 350 kg, how fast are they moving?

*December 11, 2011*

**physics**

A lever has a Mechanical Advantage of 13. How much force would the lever exert if you push with a 200N force?

*December 11, 2011*

**11th grade english**

I'm supposed to choose how the italicized noun clause is used. Not so sure about the different types of noun clauses.. can someone help me? & also kinda explain the difference? 1.The first thing to consider was [how to find a paying job.] S OP PN DO 2.I am optimistic ...

*December 9, 2011*

**Physics**

Two carts with masses of 4.24 kg and 3.44 kg move toward each other on a frictionless track with speeds of 4.90 m/s and 3.51 m/s respectively. The carts stick together after colliding head-on. Find the final speed.

*December 8, 2011*

**Math**

If Alice earns a monthly salary of $315 plus a comission on her total sales. Last month her total sales were $9640 and she earned a total of $1182.60. What is her comission rate?

*December 8, 2011*

**algebra**

k but how do I find that?

*December 6, 2011*

**algebra**

write an equation of the line that passes through the given point and is parallel to the given line (-1,3), y=2x+2

*December 6, 2011*

**Government**

The correct answer is the television.

*December 6, 2011*

**Science**

Stage of mitosis in which Chromosomes split apart

*December 5, 2011*

**Physics**

What is the maximum acceleration of a platform that oscillates with an amplitude of 2.1 cm at a frequency of 6.7 Hz? I feel like this is a very simple question, but I'm having trouble figuring it out.

*December 5, 2011*

**Physics**

A radio set at a sound level of 20 dB is suddenly increased to 80 dB. how many more time greater is the pressure amplitude at 80 dB? I do not know what to do please help

*December 1, 2011*

**Calculus I**

Find the exact area of the surface obtained by rotating the curve about the x-axis. y = sqrt(1+5x) from 1<x<7

*December 1, 2011*

**Calculus I**

Find the exact area of the surface obtained by rotating the curve about the x-axis. y = sqrt(1+5x) from 1<x<7

*December 1, 2011*

**3rd Grade Math**

Why is this statement wrong? The greater number of counters, the greater the number of arrays you can form.

*November 30, 2011*

**COMPUTER HARDWARE MANAGEMENT**

AMD (Advanced Micro Devices) is the second largest maker of personal computer microprocessors after Intel. They also make flash memory, integrated circuits for networking devices, and programmable logic devices. AMD reports that it has sold over 100 million x86 (Windows-...

*November 29, 2011*

**algebra**

There are 7 coins in a piggy bank. The coins are all quarters and dimes. All together the total amount of money in the bank is $1.15. How many of each coin are in the piggy bank.

*November 21, 2011*

**Physics**

Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 2.58 kg·m2 about its central axis, is set spinning counterclockwise (...

*November 18, 2011*

**Social Studies**

During Rutherford B. Hayes's presidential run, what's was bad or good about it?

*November 16, 2011*

**MATH**

no, why?

*November 16, 2011*

**MATH**

i need this as quick as possible please Omar is building a straight fence, with posts one meter apart. If the fence is 13 meters long, how many fence posts does he need? If the fence is 13 meters long, how many fence posts does he need?

*November 16, 2011*

**Physics**

If a&b are vectors such that a+3b=-3i+j & a-b=i-2j then find vectors a&b.

*November 16, 2011*

**Math**

A fence 8 ft tall runs parallel to a tall building at a distance of 4 ft from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

*November 14, 2011*

**Physics**

Suppose vectors a&b, if a cross b=c. Show that c is perpendicular to a&b.

*November 13, 2011*

**math**

The height of an object thrown upward with an initial velocity of 96 feet per second is given by the formula h = -16t2 + 96t, where t is the time in seconds. How long will it take the object to reach a height of 144 feet?

*November 9, 2011*

**Sport please help me i have a test 2morrow**

What are the reasons for the olympic games to be largest of all sporting events?

*November 9, 2011*

**Sport**

Why Olympia selected to hold at the ancient Olympic Games?

*November 9, 2011*

**english 2**

WHAT INFERENCE CAN YOU MAKE FROM THE FACT THAT IT IS FORBIDDEN TO GO TO THE PLACE-BY THE WATER OF BABYLON

*November 9, 2011*

**Physics**

Calculate the rotational inertia of a wheel that has a kinetic energy of 41.6 kJ when rotating at 264 rev/min.

*November 9, 2011*

**Pre-Algebra**

ok well my pre algebra teacher copied some worksheets and its pg 40 and its about some friars in a floral shop buisness. for extra credit we do the joke which is also a way to find out if our answers were correct. there is no 3/8 in my answers and welll yeah that's it.

*November 8, 2011*

**Pre-Algebra**

Ok so im in 7th grade and can somone help me with pizzazz worksheet #40? Pretty please?

*November 8, 2011*

**chemistry**

Write the formula unit, total ionic, and net ionic equation for the precipitation reaction in a beaker after Al(ClO4)3, Rb2S, and CsI salts are added. Please help!

*November 7, 2011*

**factoring polynomials help?**

5p^2+14p+8

*November 6, 2011*

**Math**

if a football team gained 13 yards in 3 tries how many yards will they gain in 9 tries

*November 6, 2011*

**Chemistry**

Sorry Dr. Bob, I wsa looking for the Sucrose, not all 16 calculations. Can you help me with the Sucrose? I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= ...

*November 3, 2011*

**Chemistry**

I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= 5.322e-3 Calculate the mass percent, molarity, molality and mole fraction.

*November 3, 2011*

**Language Arts**

I was so tired when I got home, my bed welcome me with open arms.what does this mean?

*November 2, 2011*

**calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y = (x^4)(e^-7x), with x > 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle.

*November 1, 2011*

**calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y = (x^4)(e^-7x), with x > 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle.

*November 1, 2011*

**Math word problem**

can you explain how you got it?

*November 1, 2011*

**Math word problem**

jack was 21 years older than kat. Together their ages totaled 161 years. What were their ages?

*November 1, 2011*

**Physics**

A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The coefficient of static friction between the two blocks is 0.35. The coefficient of kinetic friction between the lower block and the level table is 0.2. What is the maximum horizontal force that can be applied ...

*October 30, 2011*

**calculus**

f(x)=cos(1/x) Find a sequence for x-values that approach 0 such that cos(1/x)=0.

*October 29, 2011*

**chemistry**

If you have a solution that is 1.7 M sodium chloride and you have 1 L of that solution, how many moles of sodium chloride do you have?

*October 28, 2011*