Saturday
September 20, 2014

Posts by Bob


Total # Posts: 2,400

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

cambo
180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is six times as long as the first. What is the length of the first piece of the board?
March 1, 2011

Math
Solve: 3x-2(3x-1)+4(x+1)=0
February 28, 2011

Physics
Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.
February 27, 2011

Physics
Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.
February 27, 2011

Math
A clown was shot out of a cannon at ground level. Her height above the ground at any time (t) was given by the function h(t) = -15t2 + 15t What was height at t(1), t(2),and t(3)? The flight will last how many seconds??
February 26, 2011

physics
A 25.1 g marble moving to the right at 22.9 cm/s overtakes and collides elastically with a 12.1 g marble moving in the same direction at 11.3 cm/s. After the collision, the 12.1 g marble moves to the right at 25.1 cm/s. Find the velocity of the 25.1 g marble after the collision
February 24, 2011

physics
A spring with spring constant 21 N/m is stretched 0.35 m in the positive x direction, referring to the figure. What is the spring’s restoring force (with its sign)?
February 24, 2011

physics
A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at θ = 54.0˚ with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and (c) angle (...
February 23, 2011

math
Find the expected value of a $1 bet in six-spot keno if three winning spots pays $1 (but you pay $1 to play, so you actually break even), four winning spots pays $3 (but you pay $1 to play, so you profit $2), five pays $100, and six pays $2,600.
February 22, 2011

geometry
what does 44 feet by 9 feet by 8 feet mean
February 22, 2011

physics
7.84*10^10
February 22, 2011

Calculus - Functions?
a billion
February 21, 2011

Science
What type of plate boundary is located at the Juan de Fuca plate and Washington state on the north American plate?
February 21, 2011

math
(radical d)!=24
February 20, 2011

The United States Until 1877
We actually do not have a book. It comes from in class lectures that we take notes on. however, missing one note that you might not write down throws you off alot.
February 20, 2011

The United States Until 1877
I am completely clueless on where to start. Its for a study guide to help us prepare for a test.
February 20, 2011

The United States Until 1877
Compare and Contrast the development of the New England, Middle, Chesapeake, and Southern Colonies. Discuss the economic, religious, and social development of each from first settlement by the British to 1750.
February 20, 2011

us history until 1877
By 1700 the British colonies on the North American mainland were remarkably different, and in many ways isolated from one another. As late as 1760 Benjamin Franklin declared that a union of the colonies was “not merely improbable, it is impossible,” because the ...
February 20, 2011

physics
bob
February 18, 2011

pre-algebra
a bag contains 5 green marbles 2 white marbles 8 blue marbles 9 red marbles and 6 black marbles what is the probability of drawing a white marble replacing it and then drawing a green marble? Answer choices A 1/6 B 1/15 C 1/87 D 1/90 I think its D, but I am not sure and how ...
February 17, 2011

geometry
idk...
February 13, 2011

math
draw pattern block with a total of 22 sides
February 13, 2011

Math
What is the length of a rectangular lot that has a perimeter of 1400 m and a width of 100 m?
February 13, 2011

physics
A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...
February 13, 2011

physics
A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...
February 13, 2011

geometry
What Is The Area Of A Circle If The Radius Is 10 Inches?
February 11, 2011

art101
1. CheckPoint: Greek and Roman Architecture • Resource: Ch. 15 of A World of Art • Write a summary comparing the characteristics and innovations of each Greek and Roman architecture in 200 to 300 words. • Provide two representative examples of architecture for ...
February 11, 2011

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