Wednesday
July 1, 2015

Posts by Brooke


Total # Posts: 600

Chemistry
Using Werner Hesienbergs uncertainty principle delta x >h/ (4pie*m*delta v) when mass of electron is 9.11x10^-31kg what is the uncertainty in the position of an electron moving at 9x10^6 m/s with an uncertainty of delta v= 0.01x10^6m/s
January 14, 2013

math
47 lbs=kgs give answer in decimal form
December 23, 2012

Calculus
Find the equation of the tangent line to the graph of 4y^2− xy − 3 = 0, at the point P=(1,1)
December 9, 2012

Chemistry
Mr. DrBob222, would you mind explaining that a little more? I do not completely understand what is happening in the problem. Also, how do you know that Mg^2+ is half of OH^-?
November 14, 2012

Math
Jill made some cookies. Jill gave 1/4 of her cookies to Bob. Then Jill gave 1/2 of the remaining cookies to Joe. At this point, Jill had 18 cookies left. How many cookies did Jill have at first?
November 7, 2012

science
D=M/V D= 17/34 D= 1/2 or 0.5 g per cm
October 23, 2012

math
4(3)^2 = 4(9) = ?
October 22, 2012

Math 8R - HELP! (homework qs. check)
This is wrong. You were suppose to use the distributive property. Here, let me show you: -3(2+3x)+x-5 = -6+-9x+ x-5 Then, you combine like-terms: -6-5= -11 and then -9x+x= -8x Thus, your answer should be -11-8x. Hope I helped you a little bit.
October 15, 2012

Language Arts
No commas are needed around 1989.
October 9, 2012

Science
Strong.
October 9, 2012

Math
Assume that both Jane and Kathy start with 0 marbles. If Jane wins the first 15 games in a row, she will now have 15 marbles, and Kathy will have -15 marbles. This is because for ever game Jane wins, Kathy needs to hand over a marble. Jane cannot win anymore games. The goal ...
October 3, 2012

math
There are 6 people or hats in all. The key word in the problem is "in all".
October 1, 2012

Earth science
No. The sun is earth's source of energy.
September 30, 2012

Algebra
(9-4n)(-4)
September 27, 2012

geometry
loan officer
September 25, 2012

Please help me!!!!!!!!
this is due tonight
September 25, 2012

Physics
On some planet other than Earth a ball is thrown upward at a velocity of 22.3 m/s. It returns back to the exact position that it started at in 8.8s. What is this planets value for "g"? (
September 25, 2012

Geography
Formal are defined based on cold hard facts. Fuctional regions are organized around a focal point. Perceptional regions are reflected on human opinions.
September 24, 2012

Physical education
If you run almost everyday, then you will get use to it. I have P.E. since I was in kindergarten and now since I'm older I have to run a mile each Friday.
September 24, 2012

Physics
If a ball has an initial downward speed of 24 m/s, how far does the ball drop during the 4 s to 5 s interval?
September 23, 2012

health
Its D
September 20, 2012

Math
12 over 15 = Both can be divided by 3 so in simplest form, it would be 4 over 5 4 -- 5
September 19, 2012

Math- INCOMPLETE
What are the math problems?
September 19, 2012

Physics
7. A cat pushes a ball from a 7.00 m high window, giving it a horizontal velocity of 0.20 m/s. How far from the base of the building does the ball land? (Assume no air resistance and that ay= g = 9.81 m/s2.)
September 14, 2012

Math- INCOMPLETE
What is the question?
September 13, 2012

math
advice to finding all the factors of 110
September 11, 2012

Physics
A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.40 m/s2 for 14.0 s. 2. Maintain a constant velocity for the next 2.85 min. 3. Apply a constant negative acceleration of −8.39 m/s2 for 4.00 s. (a) What was the ...
September 11, 2012

algebra
Ops, Ms. Sue is right actually. I forgot to multiply 8 by 2
September 8, 2012

algebra
(x+8)2=32 2x+8=32 -8 -8 2x=24 divide each side by 2 x= ?
September 8, 2012

Math
Also, for the second one the rule is 8x+5. I think that is what Kerry J was referring to.
September 7, 2012

Math
You're welcome!
September 7, 2012

Math
For the first one, the rule is 4x-1. Plug the input into "x" and then check to see if you got the output right. Hope I helped!
September 7, 2012

Math
6 8/10 = 6 4/5
September 6, 2012

Grammar
No, and it should be "in new concepts."
September 6, 2012

math
let theta be an angle in quadrant three such that tan theta =6/5
August 25, 2012

5th grade english
is cactus already plural
August 23, 2012

chemistry
How much heat is needed to change 4.5g of water at 10degrees celcius into steam at 150 degrees celcius?
August 21, 2012

Social Studies
From the article I read on Wikipedia, I think it's C.
August 15, 2012

Social Studies
Maybe you could write something about the climate? Because kingdoms in the rain forest are more moist than the savanna kingdoms which are dry.
August 14, 2012

Biology
can you explain gametes and zygote of the kangaroo paw?
August 12, 2012

language arts 2
The only verb I see is "went".
August 11, 2012

algebra
I think this is how you solve it: 5x-14+28x =33x-14 Thus, 33x-14 is your simplified answer. Hope this helps!
August 9, 2012

english
I have not read the book before but from my view I think it's the first sentence.
August 8, 2012

reading
C.
August 8, 2012

math
Do you mean 'km' as in kilogram or kilometer? If you mean kilometer then it is not right because kilometer is measured in distances. Therefore, 1000 grams = 1 kilogram
August 5, 2012

math
No you cannot. It's already simplified as is.
July 30, 2012

geography
The Western Ghats.
July 30, 2012

algebra
-11 times 10 =-110 The do -11 times 6 = -66 Your simplified answer is: -110-66
July 30, 2012

Math
How I got the answer: 8+5+10+3= 26 Since there were 5 sets of numbers I did 35-26 (because 7 times 5 is 35) which is 9. So when you add them up, it would be : 8+5+10+3+9= 35 35/5 = 7 Therefore, the answer is 9. Hope this helps!
July 28, 2012

Math
The blurred out number is 9.
July 28, 2012

check geo
I believe that it's choice A.
July 26, 2012

check geo
What choice did you select?
July 26, 2012

geometry
You just add all the sides together: P= a+ b+c So when you substitute in the numbers it's P= 48+ 10+10 P= 68 cm
July 25, 2012

English
A countable noun are nouns we can count such as pen, coin, cup, plate, dog etc. An uncountable noun are subtances meaning like milk, electricity, gas, water, rice, music, love etc.
July 23, 2012

math
Add the two hours together.
July 23, 2012

math
You actually multiplied wrong, because 5*12.95= 64.75 not 64.92. The answer I got from the structure you wrote was $3.89 Thanks though! It really helped!
July 22, 2012

math
Ben purchased 5 shirts for $12.95 each. How much sales tax will he pay if the tax rate is 6%?
July 22, 2012

physics
A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16 rpm in 11.5 s. Assume the merry-go-round is a uniform disk of radius 3.0 m and has a mass of 790 kg, and two children (each with a mass of 25 kg) sit ...
June 21, 2012

physics
An 85 kg football player traveling 4.7 m/s is stopped in 1.0 s by a tackler. What is the original kinetic energy of the player? (I tried using 1/2 m v^2 but that doesn't seem to be right. How do I manipulate the formula?) What average power is required to stop him?
June 18, 2012

Social Studies
yes
June 1, 2012

Chemisty
Write all possible quilibrium equations for KHP dissovled in water and then write the quilibrium constanst expressions for the equation.
May 9, 2012

Psysics (Magnetism)
A current-carrying wire is placed in a uniform magnetic field, but there is no magnetic force on it. How is this possible?
April 24, 2012

physics
An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 1.7 multiplied by 10-14 m from the gold nucleus? N
April 10, 2012

physics
At the point of fission, a nucleus of 235U that has 92 protons is divided into two smaller spheres, each of which has 46 protons and a radius of 5.08 multiplied by 10-15 m. What is the magnitude of the repulsive force pushing these two spheres apart?
April 10, 2012

physics
Calculate the net charge on a substance consisting of a combination of 4.3 multiplied by 1013 protons and 2.5 multiplied by 1013 electrons.
April 10, 2012

US History
Got a question: On our class we have to write a research paper tracing the historical causation of a current event and the current event has to be with in a year! Can someone help me with suggestions?
March 26, 2012

chem pH
calculate the pH when 10 mL of .511 M sodium acetate and 20.00 mL of 0.350 M acetic acid
March 23, 2012

chem
calculate the pH of 0.25 M formic acid and 0.40 M sodium formate
March 23, 2012

chem
calculate the solubility of barium sulfate (Ksp=1.1x10^-10) in a) water b) a 0.10 M barium chloride solution help is GREATLY appreciated
March 18, 2012

chemistry
The answer should be (-6) (96.485 kj)(1.758) = -1017.72
February 29, 2012

Chemistry
Calculate the pH of an aqueous solution containing 3.8 10-2 M HCl, 1.0 10-2 M H2SO4, and 3.3 10-2 M HCN.
February 28, 2012

Chemistry
A 0.25 g sample of lime (CaO) is dissolved in enough water to make 1487 mL of solution. Calculate the pH of the solution
February 28, 2012

history
C) fought in a traditional manner
February 2, 2012

Culinary arts
What does the term coving mean?
January 29, 2012

Math
(-3x^-2)^-3 How would I solve this problem?
January 12, 2012

Biology
In an experiment designed to measure the distance a golf ball is hit by clubs made of different material, a standardized variable would be: A The distance the golf ball traveled B The type of material the club is made of C The material the golf ball was made of D The wind ...
January 11, 2012

Biology
The "Kingdom" is the most all inclusive taxonomic category True or False. I think it is true but not sure
January 11, 2012

Physics
The first one I believe is right except for the units. Since 2 ft/sec is just rule of thumb, it wouldn't count towards the change. That's just the information given so that 2ft/sec = 1 mile. If you have 145 miles, for every mile you're going 2 ft/sec. So you would ...
December 28, 2011

Physics
If you divide 765600 by 2 ft/sec you're going to still have a huge number. I don't think that's right somehow. I'm going to get a teacher's help today.
December 28, 2011

Physics
My computer is really slow and I've only been able to get it to work once...
December 28, 2011

Physics
I too am in VASTS... that's what I thought. The units would have to be converted first to feet to get an answer in ft/sec.
December 28, 2011

Physical Science
Thanks
December 12, 2011

Physical Science
Water boils at _______ 01 Kelvin. I put 373.15 but I dont know if it is right. Could someone please help me?
December 12, 2011

US GOV
Which of the following statements concerning the Twenty-fifth Amendment is incorrect? a. It allows the vice president to serve as acting president in the case of presidential disability. b. It allows the vice president alone to declare the president disabled. c. It requires ...
November 18, 2011

US Gov
The greatest source of presidential power is: a. the power to remove members of Congress from office for violating their oath of office. b. the power of referendum. c. politics and public opinion. d. the threat of a veto. e. the power to make political appointments. I am ...
November 18, 2011

physics
To find Work Use the Work = Pressure * delta Volume Be sure everything is in SI units 1atm=1.013*10^5 1cm^3=1*10^-5m^3 I have no idea how to find the change in internal energy though sorry
November 17, 2011

Question (PLEASE READ!!!)
chacha OR wikianswers
November 17, 2011

physics
You can use the equation (d=Vit + 1/2 a t^2) So for the first one it would be: d= (0)(1) + 1/2 (1.5) (1^2) And the answer would be .75m Each time just plug in the time to 't' and keep all the other information the same.
November 17, 2011

Physics
A 15 kg model airplane flies horizontally at point A that is 20 m about point B. It has a speed of 19.993 m/s at point A. It then flies horizontally at point B. If the loss of potential energy is reflected as an increase in kinetic energy, what is the speed of the model ...
November 17, 2011

Physics
In an electronics factory, small cabinets slide down a 30 degree incline a distance of 16 m along the incline to the next assembly stage. The cabinets have a mass of 10 kg each. Calculate the speed each cabinet would acquire if the incline were frictionless. What kinetic ...
November 17, 2011

Physics
A 1.5 N force acts on a .20 kg cart so as to accelerate it along a frictionless track. If it is accelerated from rest, how fast is it going after .3m? The answer given is 2.12 m/s but I am not sure how to get to that.
November 17, 2011

Physics
A .5 kg block is sliding along a tabletop with an initial velocity of .20 m/s. It slides to rest in a distance of .7m. Find the frictional force regarding it motion. The answer given is .0143 N but I do not understand how to get that.
November 17, 2011

Social Studies
Thanks ! Both of your responces helped answer my question ! :)
November 15, 2011

Social Studies
The question is "Evaluate the effectiveness of this action" The action was the government appologizing for Chinese Head Tax. Not only did the gov't appologize , it also gave symbloic payments to those affected by the head tax. Then it says "does it consider ...
November 15, 2011

Social Studies
I was kind of leaning towards that too ! thanks ! :)
November 14, 2011

Social Studies
Here is the question .. How did the Enlightenment contribute to the Industrial Revolution? A) People used technology to create greater prosperity for all. B) Reasoning was used to solve human problems. C) Electricity used in the production of material goods. D) People came to ...
November 14, 2011

Social Studies
Thanks !
November 14, 2011

Social Studies
Im working on a review booklet for Social Studies and theres a couple questions Im having problems with, my test is tomorrow so I don't have time to ask my teacher , hope you can help ! :) First Question: "The scramble for Africa" began in the late 1800s when ...
November 14, 2011

physics
Suppose the ball is kicked horizontally with an initial speed of 9.37m/s. If the ball travels a horizontal distance of distnace 85 meters, how tall is the mountain?
November 14, 2011

physics
Assume the driver has a mass of 70.6 kg . What horizontal force does the seat exert on the driver? Answer in units of N
November 13, 2011

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