Saturday
October 25, 2014

Posts by julia


Total # Posts: 487

calculus
The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres. Use differentials to determine: a) by approximately how many centimetres the side length of the cube increases ? B) by approximately how many square centimetres does the surface area of ...
October 12, 2014

Calculus
The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres Use differentials to determine : (a) by approximately how many centimetres does the side length of the cube increase? (b)by approximately how many centimetres does the surface area of the...
October 11, 2014

Logic
mushroom & purple => poisonous mushroom & poisonous => purple mushroom & ~purple => ~poisonous mushroom & purple => ~poisonous
October 6, 2014

physics
An electron travels 2.7 m in 6.37 × 10−8 s. How fast is it traveling?
September 30, 2014

CHEM
In the preparation of a rock salt solution, 1.522 grams of impure rock salt was dissolved in 50.0 ml of distilled water. The total mass of the solution was found to be 51.522 grams. Calculate the weight percent of impure rock salt in the prepared solution.
September 26, 2014

math
I have a 15ft board I need to cut into 2 1/8 inch pieces how many can I cut
September 17, 2014

Maths
How would you convert 11 minutes into hours?
September 14, 2014

Grade 10 Maths
An area for planting crops is given by: A = 800 + 20x - 1/2x^2 Find the value of x which the area is a maximum
September 11, 2014

physics
bob pursley, can you answer my question. SCIENCE BIOLOGY. My name is Julia. THanks. I have till 12 am. HELPPPP
September 3, 2014

SCIENCE:BIOLOGY>
bELIEVE ME OR NOT BUT i'M PRETTY SURE I HAVE MINE RIGHT.THX FOR YOUR HELP ..NOT! tHANKS DR.bOB222
September 3, 2014

SCIENCE:BIOLOGY>
1. How many seconds do you spend in school during the week (6.5 hours/day)? 2. How many micrograms are in 12 dekagrams? 3. How many centimeters are in 5 kilometers? 4. 3.25 liters are equal to how many kiloliters? 5. how man meters are in 0.65 hectometers? 6. How many grams ...
September 3, 2014

chemistry
Dr.Bob can you answer my questions. My name is Julia.. my topic is in Science:Biology
September 3, 2014

History/ English
please help!
September 3, 2014

History/ English
What does the novel 1984 by George Orwell teach us about history? In what ways is Winston a historian?
September 3, 2014

math
Determine whether the system of equation is in row-echelon form. x-y+3z=-11 y+8z=-12 z=-2
June 17, 2014

Math
A hair product company sells three types of hair products for $30, $20, and $10 per unit. In one year, the total revenue for the three products was $800,000, which corresponded to the sale of 40,000 units. The company sold half as many units of the $30 product as units of the...
June 17, 2014

Chem
Oops 0.10 mol NaOH
May 27, 2014

Chem
When 1.10 mol of NaOH is added to 1.00 L of 0.30 M HCl the pH of the resulting mixture is: a) 0.52 b) 0.70 c) 1.00 d) 13.30
May 27, 2014

English
Choose the answer that identifies the function of the gerund in the sentence. Yes, this player has worked hard on improving his strength this season.
May 24, 2014

Chemistry
Thanks :)
May 17, 2014

Chemistry
Explain why methyl red would be a good indicator for a titration of 0.25M NaOH with .025M HNO3, but a poor choice for use in a titration of 0.25M NaOH with 0.25M HCN. I'm pretty sure the first step is to find the pH of the two titrations (and then compare those to the pH ...
May 17, 2014

math
I'd convert it to minutes. 14x60=840 (plus the 3 minutes)=843minutes Divide 843 by 3 = 281minutes Then convert back to hours and minutes... 281 divided by 60 = 4hr (leave out the decimals since they represent the left over minutes) 4x60=240 (this is the time already ...
May 17, 2014

Math
175g AgCl x (1 mol/247.9g) x (1 Ag2S/2AgCl) x (143.4g/1 mol) = 50.615g Ag2S I'm assuming you've learned about basic stoichiometry and how to use mole bridges? Otherwise this type of question wouldn't be asked.
May 17, 2014

math
Terry wants to buy one pair of moccasins. She can choose from some that costs $22.50, $27.00, $20.95, and $24.75. How much will Terry save if she buys the least expensive instead of the most expensive pair?
April 29, 2014

MATH
Thank you.
March 26, 2014

MATH
14% of what number is 84?
March 26, 2014

CHEM
Can you show me the formula I need to do this problem. please a solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 2.60 ml. What is the molarity of the solution? thank you
March 25, 2014

CHEM
can you show me the formula for this problem. calculate the grams of NaOH present in 9.0 ml of a 8.0 (m/v) NaOH solution. thank you
March 25, 2014

chemistry
Calculate the concentration in % (m/m) of a solution containing 20.5 g of LiF dissolved in 340.0 g of H2O. a.1.14% (m/m) b.5.69% (m/m) c.6.03% (m/m) d.6.42% (m/m)
March 23, 2014

chemistry
In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2
March 23, 2014

Math
Write in order from least to greatest. +3,-1,-4,+2,0
March 18, 2014

Physics
Block A in the figure weighs 48.0N . The coefficient of static friction between the block and the surface on which it rests is 0.250. The weight w is 6.00N and the system remains at rest. -Find the friction force exerted on block A. -Find the maximum weight w for which the ...
March 8, 2014

physics
A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
February 10, 2014

physics
A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
February 10, 2014

math
If x varies inversely withy 3, and x=6 when y=3, find x when y=2.
February 4, 2014

math
A robotic basketball player tosses a ball upward from a height of 7 feet, at an initial speed of 111 feet per second. The height of the ball is modeled by the equation: h=−16t2+111t+7, where h is the height above the ground in feet and t is the time measured in seconds. ...
February 4, 2014

math
You are putting a brick walkway along two sides of a rectangular garden that measures 6 meters by 15 meters. The path will run the length of the garden, turn the corner, and run along the width. You only have enough brick to cover 46 square meters. How wide should the border be?
February 4, 2014

Math
Mushrooms produce a tremendous number of spores. However, very few spores go on to establish a new mushroom colony. A "colony" is actually a little bunch of fuzzy-looking cells called a mycelium. Let's say a particular mushroom produces a billion spores in a day...
January 1, 2014

Math
Uncle Joe made chocolate chip cookies. Eric ate fifty percent of them right away. Ryan ate fifty percent of what was left. Ten cookies remain. How many cookies did Uncle Joe make?
January 1, 2014

Math
There are three hundred students at Mackenzie Middle School in Brain City. If 57% of the students are female, what is the ratio of female students to male students? Answer in lowest terms
January 1, 2014

Math
The local election is over and a new mayor has been elected to lead Big Town. The new mayor received three votes for every vote received by her opponent. The new mayor received 2,541 votes. How many votes did her opponent receive?
January 1, 2014

Physics
A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 60 m behind the train, traveling in the same direction as the train at 41 m/s and accelerating at 5 m/s2. What is the speed of the car just as it passes the train? Answer...
October 16, 2013

Physics
r << 1.3e-4
October 15, 2013

physics
KE = (1/2)(m)(v)^2 = (0.5)(4)(5)^2 = 50 J Constant friction force encountered: N = (0.94)(4)(10) = 37.6 N Energy absorbed by friction: Fd = 37.6x Energy absorbed by the spring: =(1/2)(17)(x)^2 =8.5x^2 Final Equation: 50 = 8.5x^2+37.6x 0 = 8.5x^2+37.6x-50 Solve the quadratic ...
October 15, 2013

physics
r^3 << (3*(C_1)^2)/(4*pi*C_2*oil density*g) r^3 << (3)*(2.30e-4)^2 / (4)(3.14)(0.88)(660)(10) r << 1.3e-4
October 15, 2013

Algebra 1
One long-distance telephone company offers a plan such that the first 20 minutes costs $.99 and each additional minute costs $.09. Solve an inequality to find the maximum amount of full minutes you can talk for $5.00. At first I got: 5 is greater than or equal to .99+(1.8-.09m...
October 14, 2013

physics
Hello Can you explain the first equation? distance=V(t-10)+V/2 * 10 Where is this distance coming from for me to be able to solve for V? Also where is the 10 coming from in V(t-10) and V/2*10? My final equation solving for V is : V= 10d / 4(t-10)
October 5, 2013

US History
What political influences shaped the governments of the British Colonies
October 1, 2013

Geometry proving quadrilaterals
Proving quadrilaterals PLEASE PLEASE PLEASE HELP *the diagonals of a square bisect the vertex angle * the diagonal of a rhombus are perpendicular *each diagonal of a rhombus bisects the opposite angles of the rhombus help me prove please how ? tell me
September 30, 2013

Math 6th Grade Level
A baker bought 680,000 oz. of flour and packed the flour into 200 bags of equal size. He used some flour and had 100 bags left. He decided to repack the remaining flour bags into bags of 5,000 oz. bags. How many bags of flour did he have in the end?
June 19, 2013

Math
Mei packed 783 strawberries equally into 9 cartons. After giving 4 cartons to her neighbors, she decided to repack 5 strawberries into each carton. How many cartons of strawberries did she have in the end?
June 19, 2013

Math
A homeowner empties her hot water heater every 36 days and changes the filter in the heat pump every 48 days. She did both on Friday September 17, 2012. When again will she do both on the same day? (give the day of the week, the date, month, and year)
June 17, 2013

physics
The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and...
May 30, 2013

organic chemistry
for each of the following compounds, draw the form in which it will predominate at ph=3, ph=6, ph=10, and ph=14. a)CH3COOH b)CH3CH2NH3 c) CF3CH2OH please explain how to get answers. my book does not give clear examples.
May 30, 2013

BIOLOGY!!!!!!
What is the reletive amounts of mRNA that will e transcribed if there is no promoter and enhancer?
May 22, 2013

French
Help me conjugate this in French? Need help Atterrir, tu Fleurir, les plantes Fondre, les garcons Perir, les fleurs Penser, tu Manger, vous Verifier, les professeurs Marcher, le chat noir
May 16, 2013

math
I need 2 three digit numbers that total 16848
April 22, 2013

finance
Mrs. Kay who is 24 years old plans to retire at the age of 60. Mrs. Kay would like to be able to withdraw $120,000 per year from her retirement account for 40 years after retirement beginning a year after her retirement. She already has $15,000 in her retirement investment ...
April 17, 2013

chemistry
What is the specific heat of an unknown substance if a 2.31 g sample releases 12.5 cal as its temperature changes from 24.9°C to 20.7°C? Please explain ans show steps.
April 16, 2013

math
a storage crate has the dimensions : 12ft * 6ft *5ft. how many cube-shaped boxes measuring 8 inches in length could be stacked completely within the cube??
April 10, 2013

Chemistry
Enough of a monoprotic acid is dissolved in water to produce a 1.47 M solution. The pH of the resulting solution is 2.64. Calculate the Ka for the acid.
April 10, 2013

adv functions
Hi! I need help with determining the value of each of the following logarithmic expressions. Do not change the bases- thx a) log[base8]4 b)log[base(1/3)]27
April 7, 2013

Physics
if a toy car's motor propelled it 1.905m in 7.1 seconds and it kept rolling .38m for 8.6 seconds what is the coefficient of friction between the wheels and the floor assuming that is the only source of friction. i know accel=.08m/s2 and -.12m/s2 but after that i got lost.
April 5, 2013

Physics- so confused!!
I am not sure. I think the speeds are for the bullet before and after passing through the block. However, in the diagram the second block is in a different spot after the bullet hits it.
March 23, 2013

Physics- so confused!!
A bullet with a mass of 5.40 g is fired horizontally at two blocks resting on a smooth and frictionless table top as shown in the Figure. The bullet passes through the first 1.20 kg block, and embeds itself in a second 1.20 kg block. Speeds v1 = 3.90 m/s and v2 = 1.70 m/s, are...
March 23, 2013

science
A
March 18, 2013

chemistry
At 2273 K, Keq = 6.2 multiplied by 10-4 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) If [N2] = 0.04700 mol/L and [O2] = 0.01200 mol/L, what is the concentration of NO at equilibrium? please answer and explain this one as well.
March 11, 2013

chemistry
please help and explain. At a certain temperature, Keq = 10.5 for the equilibrium below. CO(g) + 2 H2(g) equilibrium reaction arrow CH3OH(g) Calculate the following concentrations. (b) [H2] in an equilibrium mixture containing 1.01 mol/L CO and 0.335 mol/L CH3OH
March 11, 2013

Chemistry
I was taught that hydrogen bonds are actually very weak, but it may just be a matter of different teachers. I would answer C) Covalent Bonding because they SHARE an electron keeping them very close and tight.
March 10, 2013

Science
77.15 ....YAY GOOGLE!
March 10, 2013

language
Well this totally depends on the child. My younger siblings all started around six, but this could vary.
March 10, 2013

Physics
A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N, I'm just not ...
March 10, 2013

Physics
A box is held against a wall (not resting on the ground). What minimum horizontal force will JUST prevent the 5.0kg box from sliding if the coefficient of friction betweent he wall and the box is 0.65?
March 10, 2013

Biology
A golgi body is used to package proteins and lipids into vesicles for transport, so it's probably a cell that produces proteins or lipids or both.
March 10, 2013

social studies
- languages - if their mother country went to war, would they join (eg. WWI (Canada): british immigrants wanted to join Britain, but french immigrants felt no connection to Britain and wanted to stay out of the war...) - school systems - religion ...the list goes on, I'm ...
March 10, 2013

algebra I
how do I solve for 16x^2+56x-120
March 6, 2013

Algebra
isn't it: [(26^4)+ (10^3)]-241
March 6, 2013

french
what is the weather like in Spring?
March 2, 2013

German
This IS grammatically correct, but it sounds weird (no offense :P). It means "I would rather put on make-up than he would", more or less. There would be better-sounding ways to say this although it is correct.
March 1, 2013

math
The application of one function followed by the application of a second function to the result of the first as in F^-1(f(x)) is called composition of functions. The two functions need not be inverse of each other. In a diagram, the output of one function is f(x) is used as the...
February 10, 2013

physics
The launching speed of a certain projectile is 3.0 times the speed it has at its maximum height. Calculate the elevation angle at launching
February 8, 2013

Chemistry
Thank you so much for the detailed steps. Finally understood what I need to do.
February 7, 2013

Chemistry
Calculate the value of Kp for the equation C(s)+CO2(g)<->2CO(g) Kp=? given that at a certain temperature C(s)+2H2O(g)<->CO2(g)+2H2(g) Kp1=3.33 H2(g)+CO2(g)<->H2O(g)+CO(g) Kp2=.733 Please show detailed steps.
February 7, 2013

Physics please help!!
A basketball player throws the ball at a 38° angle above the horizontal to a hoop which is located a horizontal distance L = 5.6 m from the point of release and at a height h = 0.4 m above it. What is the required speed if the basketball is to reach the hoop? Not sure how ...
February 5, 2013

Physics please help!!
A stone is aimed at a cliff of height h with an initial speed of v = 64.0 m/s directed 55.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 7.31 s after launching. What is the height of the cliff? What is the maximum height H ...
February 5, 2013

Physics please help!!
A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
February 5, 2013

Physics please help!!
The launching speed of a certain projectile is 9.0 times the speed it has at its maximum height. Calculate the elevation angle at launching.
February 3, 2013

Physics please help!!
A projectile is fired at 45.0° above the horizontal. Its initial speed is equal to 42.5 m/s. Assume that the free-fall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile? At what time ...
February 3, 2013

Physics please help!!
A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
February 3, 2013

Language
Oh, hahah, I wasnt thinking right. I looked back over the question and I am almost possitive that is it #3.
January 29, 2013

Language
Sorry, I dont understand what you are saying, What text?
January 29, 2013

Language
What are the three main parts of a research report? 1.title, body, conclusion 2.introduction, body, sources 3.introduction, body, conclusion 4.introduction, evidence, conclusion and I just need it checked, I believe that it is #4...is that right?
January 29, 2013

Physics
You hang mass m=0.22 kg on a spring with constant 12 N/m. You pull the mass down a distance of 0.04 m from its equilibrium position and release it. You measure the period to be 0.85 s. If you instead pull the mass down 0.12 m from its equilibrium position and release it, what ...
January 24, 2013

math
a flagpole casts a shadow 10 ft. long if a man 6 ft. tall casts a shadow 4 ft. long at the same time of day, how tall is the flagpole.
January 21, 2013

CHEMISTRY
Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters
January 12, 2013

chemistry
The solubility of bismuth iodide (BiI3) in water is 9.491 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)
January 12, 2013

MATH I HAVE ASKED TWICE ALREADY!!!!!!!!!
There will be more than one answer. To have a remainder of 8, the divisor must be greater than 8. The only single digit greater than 8 is 9, so 9 must be the divisor. Since 8 is 1 less than 9, the dividend needs to be one less than a multiple of 9. Candidates are values of 3 ...
January 6, 2013

English
Scotland
January 6, 2013

Math
Um so what's the answer, 35 or 12??
December 26, 2012

English - Ms. Sue help
I just took this and it is actullly, 1.b 2.c 3.b 4.c not even kidding....Promise!
December 19, 2012

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