Saturday
April 19, 2014

Posts by bob


Total # Posts: 2,359

world history
During the fourteenth century, Japanese women of aristocratic rank A. saw marriage customs change to their detriment. B. were transformed because of their ability to hold their own property separately from their husbands. C. became freer due to the stability of the times. D. b...

Math
$474.94

math
Find a function f which satisfies the integral equation Int(bounded from 0 to x) t*f(t)dt = Int(bounded from x to 0)(t^2+1)*f(t)dt +x

math(easy integration)
thanks a lot..

HISTORY
What was the most effective remedy for plague? A. Snake venom B. Quarantine C. Abstaining from eating certain foods D. Armenian clay

HISTORY
WHAT WAS THE MOST EFFECTIVE REMEDY FOR PLAGUE

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 relig...

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 ...

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?

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 Mississipp...

Physics
WHERE WAS THIS QUESTION FROM?

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 airpo...

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?

9thGrade
WOOO

Chemistry
Is it 5 degrees Celsius?

Chemistry
How many d electrons are there in MnO4-? please explain.

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?

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

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

math linear equations
how do u make a linear equation from a data table??

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

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

math
distribute. (8t-3)(t^2+2t+9

math
How do you convert feet to mph?

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, Msim...

Chemistry
what is the theoretical yield of Sodium Hydroxide

math
no actully 1/8

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

MATH
45

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?

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.

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

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.

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 oxidati...

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 2...

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 ...

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...

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

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 exo...

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

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

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?

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

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)

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 sto...

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

english
Whats the opposite of seditious

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...

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 ...

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 cal...

social studies
donkey

PPPPPhysicssssss
and the answer to the second part??

Science
A (blank) compound is one that burns regularly

geometry
1:9

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 ...

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?

math
274 is 25% of what number?

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?

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) +...

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

math
factor the polynomial: x^2 + 6x + 9

Algebra 1
False

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

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.

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.

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.

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.

Chemistry
acid

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

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

arithmetic
how does 28*2-21*4=100

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

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

chemistry
.0290M

Business Law Environment
Help

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)

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?

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?

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

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

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 spa...

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...

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

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

geometry
uvw=xyz if so name the postulate that applies

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

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.

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

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

algebra
Factor polynomial completely: 9y^2 - 25yz -6z2

Math: Logarithms
(log(x^6)+2log(y^3))/log(xy)

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

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

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.

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...

Physics
Hows this? h tt p: //postimage. org/image/2althux44/

Physics
Give me a minute to figure out how to post image...

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

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?

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?

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