Tuesday
September 16, 2014

Posts by katie


Total # Posts: 1,667

physics
A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (b) when the ropes make a 29.0° angle ...
October 18, 2010

Chemistry
Mercury and bormine react with each other to produce mercury(II)bromide: Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced from the reactiion 10g HG and 9g Br2? [the part that really confuses me] What mass of which reagent is left unreacted? b) What is the mass of ...
October 17, 2010

calculus
Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy. y sec(x) = 9x tan(y)
October 17, 2010

english
How do the characters, plot, and theme of The Great Gatsby support or refute the statement that "the Jazz-Age society was a bankrupt world, devoid of morality, and plagued by a crisis of character"?
October 17, 2010

7th grade
where do you add parenteses to get 6+6/6+6*6=6
October 13, 2010

chemistry
what was the answer to the least accurate balance??
October 11, 2010

Physics
What average force is needed to accelerate a 8.00-gram pellet from rest to 135 m/s over a distance of 0.800 m along the barrel of a rifle?
October 11, 2010

Physics
What average force is required to stop an 1600 -kg car in 8.0 s if the car is traveling at 80 km/h?
October 11, 2010

physics
What force is needed to accelerate a child on a sled (total mass = 65.0 kg) at 1.75 m/s^2
October 11, 2010

2nd grade
If the number is less than 70 and greater than 60, the tens digit has to be 6. Now, if the ones digit is half the tens digit, divide 6 in half. The answer is 63.
October 11, 2010

4th grade
parallelogram or square
October 10, 2010

english
Its personification It is not all for of them.
October 8, 2010

Pre-calc
The question is solve for cosx= 0.60 on the interval [0,2pi). The answer is to be posted in radians. I don't understand how to find the answer.
October 7, 2010

Chemistry
The specific heat of toluene (C7H8), is 1.13 J/g•K. How many kJ of heat are necessary to raise the temperature of 61.0 g of toluene from 15.0 °C to 37.2 °C?
October 7, 2010

earth
A helicopter is ascending vertically with a speed of 4.00 m/s. At a height of 185 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
October 4, 2010

7th grade
i don't kow how to sole this equation 5x-10=2x-7 can u help me
October 1, 2010

Chemistry
calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=7 to n=1. Is it just 6? or how do I do this?
September 27, 2010

Physics
A shotputter throws the shot with an initial speed of 15.6 m/s at a 38.0 angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.15 m above the ground.
September 27, 2010

Physics
A tiger leaps horizontally from a 5.8m -high rock with a speed of 3.6 m/s. How far from the base of the rock will she land?
September 27, 2010

Physics
A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. The hieght of the cliff is 33 m. My question is: How far from its base did the diver hit the water?
September 27, 2010

physics
A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. How high was the cliff?
September 27, 2010

chemistry
what is the mass of 1.22x10^23 molcules of carbon dioxide(co2) and silicon dioxide(Sio2)?
September 20, 2010

chemistry
44 g/mol
September 20, 2010

chemistry
what is the mass of 1 mole of carbon dioxide (CO2), and silicon dioxide (SIO2)?
September 20, 2010

physics
A ball is thrown upward from the ground with an initial speed of 26.2 m/s; at the same instant a ball is dropped from rest from a building 14 m high. After how long will the balls be at the same height?
September 19, 2010

science
_____ contain a fuel, rods to control nuclear reactions, and a cooling system. Would Nuclear reactor work??
September 19, 2010

General Chemistry
A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein. How do I go about solving this?
September 19, 2010

physics
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.3 later. If the speed of sound is 340 , how high is the cliff?
September 17, 2010

Geometry
Find the requested angle. The supplement of 135°.
September 15, 2010

Geometry
Glenda wants to glue glitter over a piece of felt shaped like a parallelogram with a height of 36 in. and a base of 46 in. If the glitter costs $1.20 per ft2 to cover the felt, how much will it cost to cover the felt? A) $55.20 B) $1987.2 C) $165.60 D) $13.80
September 15, 2010

algebra
CORRECTION LIST THE ELMENETS OF A AND B NOT A UNION B
September 8, 2010

algebra
if A= {xlx is odd} amd B={xlx>7} list the elements of A union B
September 8, 2010

math
7(3x+6)=11-(x+2)
September 1, 2010

English
I had to write five sentences in which I used 5 different tenses. Here is what I wrote: Education helps financial planning by giving basic skills needed for better jobs and higher wages. (Present) Education will help financial planning by giving basic skills needed for better ...
August 26, 2010

math
what's the expression for 6p-16 if p=3?
August 23, 2010

business ethics
How do most U.S manufacturers montor their factories for compilance with corporate codes of conduct? a. by applying an internal audit system b. by using the services of an independent NGO c. by hiring the for-profit services of a consulting or audit firm d. by inviting a ...
August 13, 2010

College physics
What is the effect of inserting a ferromagnet inside a winding coil where current flows? The effect is to Fill in the Blank 01 (increase/decrease) the magnetic field inside the coil compared to the field that would have been produced in free space. This also Fill in the Blank ...
July 28, 2010

College physics
According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true? 1. There is no force on the magnet. All forces act on the wire to keep the ...
July 26, 2010

English?
In the book Andromeda Strain, where is Vandenberg Air Force Base located?
July 25, 2010

algebra
27 5/3 divided by 21 1/3 The answer sheet said 81. How do you get this?
July 23, 2010

College physics
A toy car has a mass of 120g, including two 1.5 V batteries connected in series. Suppose the motor that drives the car is 80\% efficient (i.e., 80\% of the electric energy goes to the drive wheels, 20\% is dissipated as heat) and that friction and air resistance are negligible...
July 17, 2010

college physics
An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.3×10^7 m/s. What was the electron's speed as it left the negative plate? the voltage is 650V and the charge of q1 is 1.7*10^-9 and the charge of q2 is -1.7*10^-9
July 15, 2010

Chemistry
Many analytical instruments require liquid nitrogen. While filling an instrument with liquid nitrogen, an analytical chemist slips and spills the contents of the dewer, 29.0 L, onto the floor. Since the boiling point of liquid nitrogen at 1.00 atm is 77.4 K, all the nitrogen ...
July 14, 2010

Chemistry UPDATED QUESTION
A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm? Gases to solve for: N2, O2, CO2, and Ar
July 14, 2010

Chemistry
I'm sorry, that should read 78.08% nitrogen
July 14, 2010

Chemistry
A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm?
July 14, 2010

physics
Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 500 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s). I have the answer but I just don't know how to get...
July 12, 2010

Physics
The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? The answer is 15.7 m/s but I don't understand how to get...
July 9, 2010

business ethics
how do most US manufacturers monitor their factories for compliance with corportate codes of conduct?
June 30, 2010

english
what are the metaphors used in old ironsides poem
June 26, 2010

freshman english
What are some rhetorical methods of developing a topic?
June 20, 2010

Physics
What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?
June 8, 2010

Physics
At what speed will a car round a 52-m-radius curve, banked at a 45 degree angle, if no friction is required between the road and tires to prevent the car from slipping? (g=9.8m/s^2)
June 8, 2010

College Physics
A point on a rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s^2. What is the angular speed of a point 0.075 m from the center of the disk?
June 8, 2010

Physics
A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2m from the pivot causing a CCW torque, and a force of 5.2N is applied at the end of the rod 3.0m from the pivot. the 5.2N is at an angle of 30 degrees to the rod...
June 8, 2010

wgu
How did the moon landing help to change the way scientists understand an aspect of the natural world.
June 8, 2010

english 3
In olaudah equiano's "The Middle passage" what was his greatest fear when he boarded the ship
June 3, 2010

english 3
is fear an emotion
June 1, 2010

english 3
name two emotions Paine appeals to in his essay The Crisis
May 31, 2010

english
i have to write a declaration of independance what key words or [hrases should i use.
May 21, 2010

Calculus
Thank you! :)
May 18, 2010

Calculus
Differentiate: F(x)=e^(xsin2x) This isn't homework, it's review for our exam. Couldn't remember how to work it :( Thanks!
May 18, 2010

accounting
At the end of April, ABC company had a balance of $37,910 in vacations benefits payable account. During May, employers earned an additional $2,790 in vacation benefits, but some employee used vacation days amounting to $2,050 of vacation benefits.. The $2,050 was charged to ...
May 18, 2010

physics
Why can’t you take a photograph of your image in a plane mirror and focus the camera on both your image and on the mirror frame?
May 13, 2010

Physics
Please Help! In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this true?
May 13, 2010

poetry
Can u please explain to me the poem On the wire by Robert service in detail?
May 6, 2010

math
what is 135/180 as a grade
April 30, 2010

Courts
Write a 1,100- to 1,400-word paper in APA format comparing the entertainment fiction of the court system with its reality. · Select examples from fictional portrayals of the courtroom found in books, movies, or television; for example, The Runaway Jury, A Few Good Men...
April 27, 2010

photo
What are the definitions to principals of design in photography?
April 23, 2010

Chemistry
2.91L
April 16, 2010

English
Write a sentence that matches the form provided in the description (Sentence with compound subject and action verb.) My Sentence is : The lizard and the cat jumped on the mouse. Now i need a second sentence to match my first sentence (Sentence with a proper noun and a linking ...
April 16, 2010

Math
the fatio is 12/38
April 13, 2010

Physics
A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the ...
April 9, 2010

Physics
For B left side has m1 Right side has m2 picture looks like this ---------------------------------- I T= 637 I mb= 10kg I ------------------ ---------- <------x----------> I I I I I I m1 m2 ------------L=3m-------------
April 9, 2010

Physics
A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the ...
April 9, 2010

math
A share of common stock has just paid a dividend of $2.00. If the expected long-run growth rate for this stock is 7%, and if investors require an 11% rate of return, what is the price of the stock?
April 7, 2010

5th grade
adVERB is for VERBS ajective is nouns
March 29, 2010

US
In 1938 Mexico nationalized America's oil, according to my textbook. What does this mean? I don't get what exactly they did.
March 29, 2010

Chem
I'm still not getting the correct answer: i have 2.00g/180.15g/mol =1.11*10^-2 1.11*10^-2/.6=1.85*10^-3 and (2.4_10^-3)^2/1.85*10^-3 = 3.11*10^-9. what am i doing wrong?
March 28, 2010

Chem
Aspirin (acetylsalicylic acid, ) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH . What was the Ka value calculated by the student if the of the pH of the solution was 2.62? I...
March 28, 2010

chem
Thank you for your help! That website did clarify things a bit. Thanks again!
March 28, 2010

chem
classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.
March 28, 2010

College Chemistry
Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)
March 25, 2010

College Chemistry
pH=pKa + log(base/acid) 3.95=3.465 + log(base/acid) .494=log(base/acid) 10^.494 3.1
March 23, 2010

College Chemistry
Never mind, I figured it out.
March 23, 2010

College Chemistry
Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!
March 23, 2010

world issues
which countries give money or military support to Syria?
March 23, 2010

Chem
Consider this reaction: CO (g) + H2O (g0 <---> CO2(g)+H2(g) kc=102 at 500 K A reaction mixture initially contains 0.145 M of CO and 0.145 M of H20. What would be the equilibrium concentration of [CO]? I so far have kc= [H2][CO2]/[CO][H2O]= 102 I know i have to set up an ...
March 21, 2010

Algebra
Use a graphing calculator, it would be super easier dude.
March 19, 2010

Math
Find the vertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
March 19, 2010

Math
Find th evertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
March 19, 2010

Chemistry
sorry i did not mean to submit this question multiple times, my internet connection is low and i didn't think it went through. i apologize.
March 18, 2010

Chemistry
Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
March 18, 2010

Chemistry
Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
March 18, 2010

Chemistry
Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have to make modifications according to the stoichiometric coeffecients. So do I divide k1 by 2...
March 18, 2010

algebra
Evaluate whether a prepaid or monthly cell phone plan is most effective for a customer that uses x weekday minutes per month. I can make up my own numbers for each plan. Having problems making up the equations.
March 16, 2010

spanish
In Spain, all hotels are new and modern buildings? True or false.
March 15, 2010

College Math
Find the exact value of: sin [2sin^-1 (-sq rt (3)/2)] how do i answer this question? i don't know how to find the answer.
March 15, 2010

college math
The range can be found by plugging the values of the domain in the equation. For example, 3/(-3-6)=-1/3 -1/3 is part of the range because the range represents the outputs or y values that correspond to the inputs (the domain), or x values
March 15, 2010

Trig
How do I solve the following? sec 3 theta/2 = 2 on the interval 0<theta<2 pi? I tried to look in my textbook but it doesn't have an example. I also tried google and I was unsuccessful> How do I do this question? I know that the period for sec is 2 pi but I don'...
March 14, 2010

Pages: <<Prev | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | Next>>

Search
Members