Friday
October 24, 2014

Posts by Bob


Total # Posts: 2,439

HISTORY
13. In Mongol society, the expression "crane catching" referred to A. the popular pastime of hunting birds. B. the success of Mongol merchants in establishing long-term contracts with buyers. C. successful leaders forcing submission from rivals. D. a mysterious ...
May 26, 2011

math
Three water pipes are used to fill a swimming pool. The 1st pipe alone takes 8 hours to fill the pool, the 2nd pipe alone takes 12 hours to fill the pool, and the 3rd pipe takes 24 hours to fill the pool. If all 3 pipes are opened at the same time, how long will it take all 3 ...
May 26, 2011

math
Claire is 15 years old today. This is 5 times as old as her sister margaret was when claire was the age that margaret is today. How old is margaret today?
May 26, 2011

HISTORY
1. How did the rulers of the Canyon peoples deal with the environmental challenges that their region presented? A. They allowed high levels of citizen participation in the running of their local communities. B. They developed a remarkable level of exchange with the ...
May 25, 2011

Physics
WHERE WAS THIS QUESTION FROM?
May 25, 2011

Statistics
The Sydney Airport Commission set a performance target of 18 minutes for the time taken for passengers to claim their luggage at domestic terminals. In order to monitor performance a study was conducted by taking a random sample of 200 passengers disembarking from Sydney ...
May 24, 2011

physics
A 2.7 kg box is released on a horizontal surface with an inital speed of 2.9m/s. It moves on the surface with a deceleration of 0.27m/s^2. Calculate the kinetic friction force on the box?
May 23, 2011

9thGrade
WOOO
May 21, 2011

Chemistry
Is it 5 degrees Celsius?
May 19, 2011

Chemistry
How many d electrons are there in MnO4-? please explain.
May 18, 2011

Statistics
I have won exactly 72% of the 2400 puzzles that I played. What is the minuimum number of puzzles I must win before I have to win 73% of the total number of puzzles played?
May 16, 2011

american gov
Journalists from which country are most likely to say that they should be as nonpartisan as possible in their reporting? a. Germany b. Sweden c. United States d. Britain e. Italy i think its C? am i right
May 13, 2011

math
find the value of n so that x2-n=0 has solutions at x=8 and x=-8
May 11, 2011

math linear equations
how do u make a linear equation from a data table??
May 9, 2011

chem
Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2
May 5, 2011

chem
Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O+ 3. H2C6H6O6 4. HC6H6O6- 5. C6H6O6-2
May 5, 2011

math
distribute. (8t-3)(t^2+2t+9
May 4, 2011

math
How do you convert feet to mph?
May 3, 2011

English-cry the beloved country
Cry, the Beloved Country refers at various points to the fear that exists in South African society. According to the novel, what are the causes of this fear and what are the consequences of this fear? Include evidence from the novel to support your response. In Chapter 7, ...
May 2, 2011

Chemistry
what is the theoretical yield of Sodium Hydroxide
May 2, 2011

math
no actully 1/8
May 1, 2011

math
i'm not a hundred percent sure but i think its 2/12 so 1/6
May 1, 2011

MATH
45
May 1, 2011

math
a bootlenose dolphin jumps out of the water. the path the dolphin travels can be modeled by h=-0.2d^2+2d, where h represents the height of the dolphin in feet and d represents the horizontal distance. What is the maximum height the dolphin can jump?
May 1, 2011

geometry
Find the equation of the line that passes through the point P (-6, 8) and Q (-6, 12), and use the information to answer the question.
April 28, 2011

Algebra
Use Gauss-Jordan to solve 3x + 2y = -4 4x – 2y = -10
April 26, 2011

Chemistry
It's a multiple choice answer. I need to choose one. I don't know which one, and it would help if there was an answer and explanation to it.
April 21, 2011

Chemistry
Functional groups 1. are the repeating unit of polymers. 2. are groups of atoms whose chemical prop- erties are pretty much independent of their chemical environment. 3. perform specific biological functions using molecular recognition. 4. are a fictitious concept like ...
April 21, 2011

statistics
In a study of the effect of college student employment on academic performance, the following summary statistics for GPA were reported for a sample of students who worked and for a sample who did not work.( university of central florida undergraduate research journal, spring ...
April 20, 2011

statistics
Each person in random sample of 247 male and 253 female working adults living in Calgary, Canada was asked how long, in minutes, his or her typical daily commute was. use teh accompanying summary statistics and an appropiate hypothesis test to determine if there is convincing ...
April 20, 2011

statistics
A recent national survey reported that the general population gave the president an average rating of m= 60 on a scale of 1 to 100 with 1 being most unfavorable, and 100 most favorable. A reseracher at IC hypothesizes that IC students are more critcal of the president than the...
April 20, 2011

chemistry
220 ml of an HCl solution that is 31.4% by mass is required to neutralize .50 gal of the chlorine solution. what is the molarity of the OH- of the clorine solution? chlorine solution is NaOCl in NaOH
April 19, 2011

Chemistry
If you were to prepare a 1.00 molal solution of CaCl2 beginning with water at 27.0 C, what would the final temperature of the solution be (in C)? Assume that the specific heats of both pure H2O and the solution are the same, 4.18 J/K*g. The dissolution of CaCl2 in water is ...
April 18, 2011

algebra2
3. Graph the function f(x) = –3x3 + 9x2 – 2x + 3 using graphing technology and describe the end behavior.
April 16, 2011

trig
Graph this trigonometric function. y=-4cos(x/2+3.14)+1
April 15, 2011

Physics
A child having a mass of 45 kg sits 0.5 m from the center of a merry-go-round that is rotating with a period of 23 s. What is the centripetal force acting on the child?
April 13, 2011

Earth science
Broad areas of folded rock layers that resemble an upside-down bowl are called
April 13, 2011

Chemistry
40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? (Ka(CH3COOH) = 1.8 × 10−5)
April 10, 2011

Physics 20
dynamics A curling stone has a mass of 20kg. a curler pushed the stone across the ice to launch it down the rink. a)if the curler starts to move the stone by pushing it with 15N, what is the stones initial acceleration? b)once moving, how much force is required to keep the ...
April 6, 2011

Science
Blood from all parts of the body, exept the lungs goes to what part of the heart
April 6, 2011

english
Whats the opposite of seditious
April 5, 2011

physics
A straight ladder is leaning against the wall of a house. The ladder has rails 4.50 m long, joined by rungs 0.470 m long. Its bottom end is on solid but sloping ground so that the top of the ladder is 0.780 m to the left of where it should be, and the ladder is unsafe to climb...
April 4, 2011

Chemistry
This is for a lab about determining the equilibrium constant. Given: 5.00mL of .203M Fe(NO3)3 mixed with 100mL of .00205M KSCN in a .5M HNO3 solvent for both solutions. Resulting absorbance for solution is .315. How can i find the total Fe, [Fe*] and SCN, [SCN*] in the system ...
April 3, 2011

English Honors - Tale of Two Cities
Try reading the book instead of the sparknotes, and you'll see the line points backward, to the death of Gaspard's son under the wheels of the Marquis' speeding carriage. Defarge was present, and witnessed the Marquis love of racing his carriage around, and his ...
April 3, 2011

social studies
donkey
April 2, 2011

PPPPPhysicssssss
and the answer to the second part??
March 31, 2011

Science
A (blank) compound is one that burns regularly
March 30, 2011

geometry
1:9
March 30, 2011

statistics
A university dean wishes to estimate the average number of hours his part-time instructors teach per week. The standard deviation is 2.6 hours. How large a sample must be selected if he wants to be 95% confident of finding whether the true mean differs from the sample mean by ...
March 30, 2011

math
i don't think that you guys are helping because your not explaining the answer your giving it how is my child supposed to learn from that?
March 30, 2011

math
274 is 25% of what number?
March 30, 2011

Math
At the city museum, child admission is and adult admission is . On Friday, four times as many adult tickets as child tickets were sold, for a total sales of . How many child tickets were sold that day?
March 29, 2011

Chemistry
Assuming all volume measurements are made at the same temperature and pressure, how many liters of carbon dioxide gas can be produced when 12.8 liters of oxygen gas react with excess carbon monoxide? Show all of the work used to solve this problem. Unbalanced equation: CO(g...
March 29, 2011

Physics
.17 kg hockey puck initial velocity 21 m/s stops 62m away. what is coefficient of friction?
March 29, 2011

math
factor the polynomial: x^2 + 6x + 9
March 28, 2011

Algebra 1
False
March 28, 2011

math
List the following elements in proper set notation. Place the elements in numerical order within the set. * 0 * 1 * 123 * 4 * 34
March 27, 2011

Math
Find the length of the diagonal in the doorway. a^2 + b^2 = c^2 42^2 + 84^2 = c^2 1764 + 7056 = c^2 8820 = c^2 93.9 = c The table will not fit.
March 24, 2011

Math
Find the length of the diagonal in the doorway. a^2 + b^2 = c^2 42^2 + 84^2 = c^2 1764 + 7056 = c^2 8820 = c^2 93.9 = c The table will not fit.
March 24, 2011

Chemistry
acid
March 22, 2011

math
is 5.2 <,>,= to 5-2/5
March 21, 2011

chemistry
what is the net ionic equation, including phases, for the reaction of AgNO3 with Ba(OH)2
March 21, 2011

arithmetic
how does 28*2-21*4=100
March 18, 2011

chemistry
How many mL of 5.00% (w/v) solution are needed to make 100mL of physiologic saline (0.90%(w/v) sodium chloride)?
March 17, 2011

chemistry
How do you know when to out a chemical formula in aqueous form? please help me....
March 16, 2011

chemistry
.0290M
March 16, 2011

Business Law Environment
Help
March 16, 2011

trip
for sin2x+cosx=0, use double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval (0,2Pie)
March 16, 2011

Physics
A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 54 W at an rms voltage of 26 V. a) How many turns are in the primary coil? b) What is the current in the primary coil?
March 14, 2011

Physics - Transformer in AC
A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 54 W at an rms voltage of 26 V. a) How many turns are in the primary coil? b) What is the current in the primary coil?
March 14, 2011

chemistry
Calculate the molar solubility of in the following substances. Pure water and 1.5×10−3 K2CrO4
March 14, 2011

Physics
L=[k(x_c)^2 - 2mg(x_c)sin(theta)]/[2mg[(mu)cos(theta) + sin(theta)]]
March 13, 2011

Physics
a) A distant spaceship carrying a red headlight, emitting light with wavelength 600 nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200 nm. What is the velocity of the spaceship? b) After the ...
March 13, 2011

Really Physics
A 2.4 Kg object moving to the right at 0.8c collides with a 3.2 kg object moving to left at 0.6c. They stick together. Find the mass and velocity of the resulting combined object by; a) assuming that you have no knowledge of relativistic physics, b) using the special theory of...
March 13, 2011

maths
a box is to be made from the piece of cardboard at right, where square corners of side x are to be cut out, and sides folded up, and top enclosed. Find the possible heights x of the sides when the volume of the box is 10, within the interval of length 1
March 10, 2011

prealgebra
The length of a rectangle is 7cm greater than the width. Find the length and the width if the perimeter is 54cm
March 9, 2011

geometry
uvw=xyz if so name the postulate that applies
March 9, 2011

Chemistry
type in 1.27*(10^-7) instead. I had the same problem
March 9, 2011

Chemistry
How many grams do 5.2×10^20 atoms of silicon weigh? Answer in units of g.
March 8, 2011

physics
And how to find, I have been working on this for a while, and keep getting a wrong solution. Answer is 45.7m/s, but I cannot get my work to figure properly.
March 8, 2011

physics
15000N on earth 2250N on moon Moon Radius= 1.74x10^6m Orbital Height 100km Total orbit 1.84x10^6m What is orbital speed?
March 8, 2011

chemistry
A pickling solution is prepared by dissolving 278 g of NaCl in 4-1 L of water. Calculate the osmolarity of the solution
March 8, 2011

algebra
Factor polynomial completely: 9y^2 - 25yz -6z2
March 8, 2011

Math: Logarithms
(log(x^6)+2log(y^3))/log(xy)
March 7, 2011

College Algebra
solve the following: Log(50x)+log(x-1)=2
March 7, 2011

computers
You wish to calculate the commission on sales. The commission is 6% on all sales that are at least 20% above cost.
March 7, 2011

geometry
A sign is in the shape of a rhombus with a 60° angle and sides of 2 cm long. Find the area of the sign to the nearest tenth.
March 7, 2011

Physics- magnetism
The four wires in the figure are tilted at 20degrees with respect to the field direction. Each carries a 4.5 current and is 0.35m long. What is the magnitude and direction of the force on each wire? (the answer is in terms of B-magnetic field) Image: h t t p: //p osti mage. or...
March 7, 2011

Physics
Hows this? h tt p: //postimage. org/image/2althux44/
March 7, 2011

Physics
Give me a minute to figure out how to post image...
March 7, 2011

Physics
Just got what you were asking: Each wire: 20 degree angle I= 4.5 A l=.35m
March 7, 2011

Physics
I can't figure out how to post the image. The dimensions of the wire do not matter in this problem. And I am not given the B strength. Can I e-mail you a link to image?
March 7, 2011

Physics
The four wires in the figure are tilted at 20 with respect to the field direction. Each carries 4.5 and is 0.35 long. What is the magnitude and direction of the force on each wire?
March 7, 2011

Math
Find two numbers whose sum is 90 and one-third of the smaller number is equal to one seventh of the larger number
March 7, 2011

calculus
integrate xsin(2x)dx=
March 6, 2011

calculus
if the region enclosed by the y-axis, the line y=2 and the curve y=the square root of x is revolved about the y-axis, the volume of the solid generated is????
March 6, 2011

cdemistry
2.20
March 4, 2011

Biology
A space probe discovers a planet inhabited by creatures who reproduce with the same hereditary patterns as those in humans. Three phenotypic characters are height (T = tall, t = dwarf), hearing appendages (A = antennae, a = no antennae), and nose morphology (S = upturned snout...
March 2, 2011

math
Use four 4s to make all the numbers from 0 to 50 example 4+4 6=4+---- 4 use any mathematical signs but four 4s may be used for each number
March 2, 2011

algerbra
what is the degree of the polynomial 8x^5y^4-2x^8
March 2, 2011

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