# Posts by kate

Total # Posts: 2,015

Physics
The sketch shows a mobile in equilibrium. Each of the rods is 0.16 m long, and each hangs from a supporting string that is attached one fourth of the way across it. The mass of each rod is 0.10 kg. The mass of the strings connecting the blocks to the rods is negligible. What ...

Science (simple machines)
The plank is 3.6 metres long. It is being used as a lever to lift a 40-kilogram box. This represents a load of 400 newtons. (a) If the fulcrum were placed in the centre of the plank, what downward effort would the man on the right need to apply to raise the box? (b) If the man...

Physics
A building with a weight of 5.200e+7 N is built on a concrete foundation with an area of 1300 m2 and an (uncompressed) height of 2.82 m. By what vertical distance does the foundation compress?

Physics
Bob and Ray push on a door from opposite sides. They both push perpendicular to the door. Bob pushes 0.63 m from the door hinge with a force of 89 N. Ray pushes 0.57 m from the door hinge with a force of 98 N, in a manner that tends to turn the door in a clockwise direction. ...

Chemistry
1.423

Chemistry
0.375

Physics :)
A motor lifts a 70.0 kg box off the ground, starting from rest. In 8.00 seconds it lifts the box to a height of 20.0 m. At that time, the box is moving upward with a velocity of 5.00 m/s. What is the average power of the motor during this time interval?

Find the volume of the right triangular prism. The bases are equilateral triangles with a length of 6 mm. The height of the prism is 8.4 mm. (Round to the nearest tenth.)

Parabola
How do I put this parabola in standard form? Could someone show how they would put it in this form: (x - h)2 = 4p(y - k) 1. 4x^2+24x+128y-988=0 Please help! I'm lost.

Parabola
3y^2+24y+72x-96=0 Can anyone put this in standard form: (y - k)2 = 4p(x - h) All help is greatly appreciated! :)

Pecalculs
Thank you again! ^o^

Pecalculs
Sorry: Precalculus! :P

Pecalculs

Parabolas in standard form!
WOW! Thank you so much! you made more sense than my teacher! :D

Parabolas in standard form!
Can you solve this one?: x^2-12x-48y-372=0 & I made a mistake one the second one!! Its actually: x^2+14x+44y+313=0 !!

Parabolas in standard form!
Hello, I am having the worst time trying to solve these parabolas and putting them into x-h = a(y-k)^2 form. :( There are two problems that i keep doing something wrong. could someone solve them so I can have a set up for the rest of my problems? :) 3y^2+6y+108x-969=0 and x^2+...

Ellipse equation?
Thank you, @Steve ! Would you happen to know how to find the Foci for this equation?!?! :)

Ellipse equation?
(x-2)^2 / 49 + (y+1)^2 / 25 = 1 a.) what are the vertices? b.) What are the major and minor axises? I always have troubling understanding how to find these. :( Any help is greatly appreciated!

The crucible
In the Crucible, what was john proctor's difficult decision that was somehow related to the society in which he lived in?

Literature

Antigone Literature
Creon criticizes others for stubbornly refusing to change their minds. Why is this ironic? I believe its ironic because everyone is so caught up in what they think is right, including Creon. I just want another persons opinion on why they think its ironic! :) Its always ...

History
Which one of the following would be a primary source??? A) Your history book B) A letter from a soldier C) A picture of pyramaids D) A website about history HELP!!!

trig
write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

math
Miss C gives a test to the 10 students in her first-period algebra class. The grades are 93,82,95,86,90,84,89,79,87,93 A. Find the mean and Standard Deviation of the 10 scores. B. List all the reasons for why the late class could have a different mean or standard deviation

egypt
how did the egyptians explain the unknown?????????

Math
Diana practices the piano 45 minutes each day o Sunday, Tuesday, Thursday, and Saturday. How many minutes does she practice the piano each week?

history
also what belief and value did jesus teach

history
how big was the city of rome?

language arts
Thank you Ms.Sue

language arts
How should I fix it?

language arts
Is this sentence a run on? An important decision made by Parvana was when Parvana agreed to go outside to buy food while she was dressed as a boy.

math
For the sequence 0,3,8,15,24,35.... find a formula for tsubn in terms of n.

SOCIAL STUDIES PLZZ HELP
Brasilia and the indengionus way of life

physics
A uranium nucleus 238U may stay in one piece for billions of years, but sooner or later it de- cays into an particle of mass 6.64×10−27 kg and 234Th nucleus of mass 3.88 × 10−25 kg, and the decay process itself is extremely fast (it takes about 10...

math
A geometric series has first term 8 and third term 20 what does the fifth term equal? What does the third partial sum equal?

maths
(a) A random survey of 100 mobile telephone customers indicated that 96 of them had not experienced any difficulties in making mobile calls in the previous 3 months. (i) Derive a point estimate for customer satisfaction levels with the service (ii) Construct a 95% Confidence ...

Accounting
Questions 1. What is the issuing price for bonds A and B respectively? Show your calculations. 2. For bond A, provide the journal entries for • the issuance of bond, and • the first three interest payments. Please write down the date for each journal entry. Show your...

intermediate algebra
I don't know what the AC method is but I would do the following: 2x(3x^2-2x-5) 2x(3x-5)(x+1)

Chemistry help!!
So I got 38.13 mL .. Thank you so much now that I see how to do it, it makes much more sense to me.

Chemistry help!!
A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? It says to first...

Algebra
Not sure if this is correct but i 57*x+13*x-5=5 just a guess not sure if this is correct.

Chemistry
A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? Calculate grams ...

english
Be sure to develop your speech in the way the audience who you will be talking to will understand, and be sure to make a speech that will catch everyone's attention! Best of luck! :)

Government
Does the U.S. have a responsibility to become involved in Syria or any other country where civilians are being killed by their leaders?

Math
At a track meet, competitors could win gold, silver or bronze medals. Kennedy High Schools track team won a total of 18 medals. Three of the medals were gold. There were twice as many bronze medals as silver medals. How many bronze medals did the track team win?

Social Civics
and thank you for your help!

Social Civics
Yeah I know...civics isnt my cup of tea.

Social Civics
I have heard that they have a 100 word essay. What would it be on?

Social Civics
Does anyone know how to prepare for the final exam for Social Civics for American Schools?

english
The second line is Italic

calculus
Let f(x) = (x − 3)−2. Find all values of c in (2, 5) such that f(5) − f(2) = f'(c)(5 − 2). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) C=?

chemistry

chemistry
How many grams of solute are present in 785 mL of 0.480 M KBr?

Chemistry
Predict the color change when an aqueous solution containing Ag+ ion is added to a green solution of the copper (II) ion. It is green because HCL has been added. Thanks.

Chem
How many mL of .150 M sodium hydroxide is required to neutralize 25 mL of .125 M of phosphoric acid?

Chemistry
What mass of solid calcium hydroxide is required to neutralize .100 L of .500 < sulfuric acid?

Chemistry
How many mL of .150 M sodium hydroxide is required to neutralize 25 mL of .125 M of phosphoric acid?

math
Bob finds that the cost of driving his truck is 92 cents per mile. Give a symbolic and graphical representation for a function f(x) that computes the cost in dollars of driving x miles. Assume 0<x<60

What pH buffer solution is needed to give a Ni2+ concentration of 2.5 x 10-3M in equilibrium with solid nickel hydroxide Ni(OH)2? Ksp = 6.0 x 10-16.

math
I had a total of 129 marbles in 3 boxes at first. Then i away 2/3 of the marbles from box1, added 15 marbles to box 2 and added somes to box 3 until the number of marbles in box 3 tripled. As a result, the ratio of the number of marbles in box 1 to the number of marbles in box...

Math
100Ã—431Ã·8576-234+65454Ã—443321167899= [this might be hard]

Science
A student observed two different types of cells under a microscope. She noticed that one cell had many more mitochondria than the other. What can the student predict about the cell with more mitochondria? A. The cell produces more waste. B. The cell makes more proteins. C. The...

Chemistry
FIRST U should find whether there is reaction when they are mixed,and then what is the concentration of the mixture.next,find the concentration of H+ ion,finally,use this formular to solve your problem pH =-log[concentration of H+ ]

Art
These are all of the answers!! Gosh how hard could this possibly be. 1. Alexander Calder invented this type of art. (0 pts) fiber art (1 pt) mobiles (0 pts) stabiles (0 pts) public art 2. Today, decisions in planning, selecting, and/or creating an artwork for public display ...

A 11 mL sample of a solution of AlBr3 was diluted with water to 23 mL. A 15 mL sample of the dilute solution was found to contain 0.045 moles of Br-. What was the concentration of AlBr3 in the original undiluted solution? answer is 2.09 but i cant get it.

chemistry
. A 13 mL sample of a solution of AlBr3 was diluted with water to 56 mL. A 25 mL sample of the dilute solution was found to contain 2.21 M Br-. What was the concentration of AlBr3 in the original undiluted solution?

chemistry
How many milliliters of a 155 mL solution of 1.7 M AlCl3 must be used to make 70 mL of a solution that has a concentration of 0.21 M Cl-?

SCIENCE
no idea

oh that's ok then.thank you for trying though!!!I already really appreciate that!!!so still,thank you. :)

what would happen if cytokinesis occurred without mitosis???

chemistry
describe how to prepare a .50 m solution of lead nitrate using only 100.00 mls of water. aslo discribe how to prepare a .50m sloution of sodium iodide using only 100.00 mls of water. explain the differences that exist between these two solutions. OK i have answers for both 1....

A stray dog ate 12 of your muffins.That was 3/10 of all of them! with how many did you start???

can someone please explain to me what the Answer is and also can someone please explain to me how to slove this question step by step??? Please??!!

If the weight of a package is multiplied by 5/7 the result is 40.5 pounds.Find the weight of the package.

thank you

your mother gave you \$13.32 with which to buy a present.This covered 3/5 of the cost.how much did the present cost? can someone please help me and also show me how to solve this?

thank you soooo much!!!!:)

why would a shredded carrot turn the softest when it is sitting on top of a table out in the open air compared to the carrot in water and the carrot in salty water?

math
How long is a diagonal tof a paper

Calculus (Antiderivatives)
ok im sorry :(

Calculus (Antiderivatives)
no idea

cells

cells

cells
suppose a cell is placed in a large container of water with a very low solute concentration.what do you think will happen?

Chemistry
IS this right?

which particles cannot pass through the cell membrane?

Math
In a playground, there is a model of the old school building that is 6.6 feet long, 3.3 feet wide, and 4.6 feet high. If the real building was 80 feet long and 40 feet wide, how high was it?

chemistry
1.5x10^7 molecules of hydrogen sulfate. find the number of grams for the molecules listed