Wednesday
August 27, 2014

Posts by Kevin


Total # Posts: 932

Chemistry
1 pound per square inch = 0.0680459639 atm (.0608 atm / 1 psi) x 17.4 psi. This cancels the psi unit and gives your answer in atm.
November 18, 2010

Physics
A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5 s. Through how many revolutions did the wheel turn during the 5 s of braking? I ...
November 18, 2010

5 th grade English
stroll is to walk opposite of enormous can be small or tiny, you choose opposite of release can be throttle or suppress, you choose sorry i do not know the first one
November 17, 2010

8th grade
24 radical 152 is the same as 48 radical 38
November 17, 2010

british literature
no
November 17, 2010

Physics
A 2.60-kg block is attached to a horizontal spring that has a spring constant of 160. N/m. At the instant when the displacement of the spring from its unstrained length is -0.115 m, what is the acceleration a of the object?
November 16, 2010

Calculus
find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)
November 14, 2010

Calculus Tangent lines
find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)
November 14, 2010

Calculus
What are the antiderivites of x/ (x^2 (squareroot of x^4-1)) and 1/ (1+(x^2/4)) no idea :{
November 14, 2010

U.S. Presidents
Yeah i was typing that while before you posted a second time btw.
November 14, 2010

U.S. Presidents
Actually hes not anymore. Nolan Ryan and Chuck Greenberg are now the owners.
November 14, 2010

Physics
How much work must be done to stop a 970 kg car traveling at 115 km/h?
November 13, 2010

chemistry
suppose 10 g of sulfur is reacted with 48 g of fluorine gas to make SF6, and after the reaction is complete, the temperature in the flask is 125 C. Find the partial pressure of SF6 in the flask and the mole fraction of SF6 in the 6L flack after the reaction is complete.
November 10, 2010

Physics
Did you try velocity squared, then multiplied by the density?
November 10, 2010

Chemistry
A photon has a wavelength of 350 nm. Calculate the energy of the photon in joules
November 6, 2010

Chemistry
What is the frequency of light having a wavelength of 360 nm?
November 6, 2010

physics
A rock is dropped from a height of 130.0 meters. With what velocity does it land? How long does it take to fall?
November 5, 2010

Physics
A flat uniform circular disk (radius = 2.10 m, mass = 1.00 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.00 m from the axis, begins to run on ...
November 4, 2010

Physics
A race car has a mass of 715 kg. It starts from rest and travels 38.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
November 2, 2010

3rd grade
what number is 30 more than 432?
October 27, 2010

math
Suppose 4 days before the day after tomorrow was Thursday. What day of the week was yesterday?
October 25, 2010

8th grade
when a truck pulls a trailer the trailer and truck accelerate forward even though the action and reaction forces are the same size but are in oppsoite direction. Why don't these forces balance each other?
October 25, 2010

chem
what is the pH of a solution that is 0.40 M in sodium acetate and 0.60 M on acetic acid? (Ka for acetic acid is 1.85x10^-5.)
October 17, 2010

Calculus
Find the equation of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2-y^2) at the point ( -3 , -1 )
October 15, 2010

Algebra
a rectangle with perimeter of 198 cm is divided into 5 congruent rectangles. What is the perimeter of one of the five congruent rectangles? i got the expression 5w + 4L = 198 the rectangle has two smaller rectangle on the top facing horizontally on the top and three smaller ...
October 14, 2010

math
.52
October 12, 2010

stats
How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when using a 95% confidence interval?
October 7, 2010

General Physics
The 5 kg block in the figure slides down a frictionless curved ramp, starting from rest at a height of h = 3 m. The block then slides d = 12 m on a rough horizontal surface before coming to rest.What is the coefficient of friction between the block and the horizontal surface?
October 5, 2010

7th grade
Max wants to hang a picture 2 3/4 inches above a desk. His ruler is marked in 1/16ths. Max must use which measurement to hangb the picture? A. 2 1/16inches B. 2 3/16inches C. 2 9/16inches D. 2 12/16inches
October 5, 2010

English 2
1. b
October 5, 2010

Physics
I have a very similar problem due on mastering physics in an hour.. I came here to get help but now 30 minutes later I'm actually going to be giving help :). Hopefully it wont be too late depending on your time zone. u= coefficient of static friction force of friction = u*...
October 3, 2010

english
is i a noun?
September 29, 2010

physics
three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
September 25, 2010

physics
three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
September 25, 2010

english/ grammar
what is a concrete noun?
September 15, 2010

mgt330
A worker in an automobile assembly line who chooses this type of work because of the job security it entails is said to be Intrinsically motivated Experiencing overpayment inequity Experiencing underpayment inequity Extrinsically motivated Self-actualizing
August 29, 2010

MARKETING
Your company’s sales are 50,000 units. The unit variable cost is $12. Your markup percent on sales is 40% and your fixed costs are $100,000. 1. What is your profit / loss?
August 29, 2010

mgt 330
General environment – how will the forces be changing over the next three years and how will these forces impact the industry (for example, demographics – aging population)?
August 28, 2010

mgt330
List at least one reason why you think workers may be more motivated by job security rather than salary and benefits in difficult economic times.
August 28, 2010

mgt 330
List at least three reasons why workers might be more satisfied with their jobs than in the past. List at least one reason why you think workers may be more motivated by job security rather than salary and benefits in difficult economic times
August 28, 2010

calculus
Let f(x)= Cube root(x + 2) and g(x) = x^3 - 2. Which of the following are true? I. g(x) = f^-1(x) for all the real values of x. II. (f£»g) (x) = 1 for all reak values of x. III. The Function is one-to-one.
August 18, 2010

calculus
(a) Graph the parameterized curve described by x = 2sint, y = -3cost, 0<= t <= pi. Indicate the direction in which the curve is traced. (b) Write a Cartesian equation for the parametrized curve. What portion of the graph of the Cartesian equation is traced by the ...
August 18, 2010

calculus
Find the parametrization for the left half of the parabola: y = x^2 - 4x + 3.
August 18, 2010

college
What role does ovaries play in the homeostasis subject, and what other reaearch about the ovaries is currently taking place?
August 12, 2010

Electricity
How long will it take to? 500 kms of wire, 1 curcuit breaker at one end and light at the other end. How long will it take, once the breaker is on for the electricity to travel 500kms to turn the light on.
August 6, 2010

math
a rectangular table top measures 4/5 of a meter long by 4/5 of a meter wide. What is the area?
July 25, 2010

economics ss
which is a valid generalization based on the information in the chart
July 24, 2010

sociology
• How does studying social institutions help sociologists understand society?
July 14, 2010

AP Biology
Plants have three basic organs, roots stems and leaves. Describe in detail the types of cells and tissue involved with each organ and their function in transport mechanisms in plants.
June 27, 2010

Chemistry
Just to confirm, the answer is 2.004748935 x 10^-5, right?
June 15, 2010

trigonometry
A construction worker working at 300 feet from the ground, drops a nail onto the ground below. The function, s(t) = -4.9t2 + 300, gives the height (in meters) of the object as it falls to the ground. The velocity at time t = 3 seconds is given by lim(t->3) s(3)- s(t)/ 3-t. ...
June 8, 2010

trigonometry
A construction worker working at 300 feet from the ground, drops a nail onto the ground below. The function, s(t) = -4.9t2 + 300, gives the height (in meters) of the object as it falls to the ground. The velocity at time t = 3 seconds is given by lim(t->3) s(3)- s(t)/ 3-t. ...
June 8, 2010

Probability
1) What is the probability of tossing 6 coins and getting at least two tails? 2) Suppose you flip a penny, a nickel,a dime and a quarter. What is the probability of getting heads on the penny and nickel and dime and tails on the quarter? Please show steps for the solutions. ...
June 4, 2010

Algebra
Joleen is a sales associate in a clothing store. Each week she earns $250 plus a commission equal to 3% of her sales. This week her goal is to earn no less than $460. Write and solve an inequality to find the dollar amount of the sales she must have to reach her goal.
June 3, 2010

STATISTICS
a. Probability of drawing a white ball is 10(number of white balls)/ 30 (total number of balls) since the balls are replaced, the probability remains the same for the second ball, that is 10/30. To determine probability of drawing balls with replacement is found by multiplying...
June 2, 2010

math
solve in terms of r:s=a/1-r
May 31, 2010

physics
with sig figs: 1,000,000
May 13, 2010

Electronic Instrumentation
I'm having trouble finding Q2. -5.2 x 10^19 x 6.2 x 10 ^18?
May 11, 2010

Electronic Instrumentation
Calculate the force in Newtons that exists between a positive charge of 2C and a negative charge of 5.2 X 10^19 electrons separated by a distance of 25 cm.
May 11, 2010

Calc
f(x,y,z) = y; W is the region bounded by the plane x+y+z=2;cylinder x^2+z^2=1. and y=0. What I have set up isL 4 int(0 to 1) int(0 to sqrt(1-x^2)) int(0 to 1-x-y) y dydzdx. But solving this is pretty cumbersome. Any other ideas?
May 9, 2010

Chemistry
The hydrogen in an eudiometer has a volume of 80 ml when the pressure is 740 mm. what's its volume at standard pressure?
May 6, 2010

algebra 3
what statement best describes the function f(x)=2x^3+2x^2-x?
May 6, 2010

7th grade
six coins are dropped on the floor. find the probability that they will all land heads up.
May 6, 2010

Chemistry - Molecular orbital Config
So when asked to draw the molecular orbital configuration, you draw the orbital configurations for each element in the compound while doing something with the pi and sigma bonds?
May 1, 2010

Chemistry - Molecular orbital Config
I'm having trouble with this problem on my homework, We are supposed to write the molecular orbital config for a molecule. Could someone walk me through the process of how to do this and I'll see if I can get the hang of it? What I have to draw is a diatomic molecule. ...
May 1, 2010

Econ
How do i explain the change of evolution of financial markets over the past 2 years? i feel like what i have now is just a simple breakdown of how the crisis happened. any advice?
April 29, 2010

ALGEBRA
alright. the first one would be easiest if you multiplied out the numbers before the parenthesiss into the numbers inside. so itll look like 50=3r+48-2r+4.the u can simplify the right side and get 50=r+52. subtract 52 from both sides and your answer is r=-2 the second one ...
April 28, 2010

algebta 2
To find the nth term of an arithmetic sequence the formula given is a(sub n) = a (sub 1) + (n-1)d. Why is (n-1) a part of the formula? Why isn't just n?
April 27, 2010

chem 1406
now you just multiply them. the number you had before was right just not the whole cancelling out stuff.
April 27, 2010

chem 1406
you had it set up right before. ur messing up the algebra. you were solving for the x kj so in order to do that you would have to multiply both sides by the 2000 moles. the moles and 200o would cancel on one side and just the moles on the other. but your number is correct. if ...
April 27, 2010

chem 1406
you shouldve got a bigger answer and ur solving for the kj not kj/mol. remember you have to multiply the 2000 moles by the 4130 kj/mol to get rid of the mole.
April 27, 2010

chem 1406
yep
April 27, 2010

Chemistry
you have to keep in mind its asking for the greatest increase ionization energy when the between the removal of the first and second electron. That is basically saying it will lose 1 electron no problem but the second one would be a lot harder. therefore you would have to look...
April 27, 2010

Math Probability
yes
April 27, 2010

another college chem
sry we have not gotten that far yet. wish i could help
April 27, 2010

Math
theres 2 different methods u could do. u could solve for either x or y in one of the equations and replace the one you solved for. thatd be the easiest with those numbers
April 26, 2010

College chemistry
you have to convert it from joules to calories and idk that off hand but other then that it looks good so far
April 26, 2010

College chemistry
specific heat of h2o is 4.184
April 26, 2010

College chemistry
it makes sense too because if you think about it you are making a 5.0 L solution and 191.20 mL isnt even 1/5 of a liter
April 26, 2010

College chemistry
yep
April 26, 2010

College chemistry
use the equation drbob222 gave you before. its the right one. you may have to convert the 5 L to mL first though for it to work or understand that ur answer is in L and convert it. one or the other
April 26, 2010

Chemistry
if im missing any info plz tell me ill get back to it asap. it was put in a styrofoam cupand the temperature of the solution was measured directly if that helps at all. i just need to know i guess whether or not im treating the data as a coffee cup calorimeter or doing ...
April 26, 2010

Chemistry
g+ 2HCl-->MgCl2+H2 The mass of the HCl is 24.852 g mass of the Mg is .990 g and the mass of the calorimeter is 3.711 g. the change in temperature of the solution was +19 degrees celcius. itd be great if i could just get a basic equation to use or something i can do the ...
April 26, 2010

geometry
the first thing that you need to do is solve for x. The sum of the interior angles inside a pentagon is equal to 540 degrees. you come up with the equation 2x+6x+4x-6+2x-16+6x+2=540. Then you want to simplify it down to 20x-20=540. there are multiple ways you can finish this ...
April 26, 2010

Chemistry
opps i suppose i forgot to give the temperature change and it was a +19 degrees celcius
April 26, 2010

Chemistry
Mg+ 2HCl-->MgCl2+H2 The mass of the HCl is 24.852 g mass of the Mg is .990 g and the mass of the calorimeter is 3.711 g. How do I calculate the heat of the reaction of all this please?
April 26, 2010

trig
you have to use the law of sines which a/sinA=b/sin B=c/ sin C where the top letter is the opposite side of the angle and the lower letter is the angle itself. first you would go about solving this for angle B by putting 12/sin 76=4/ sin B. doing simple algebra the equation ...
April 26, 2010

algebra 2
is that exactly how it is showed or is there a log base? normally that means theres a log base 10 and if that is the case the answer is 10^3.2. in a more general sense x=b^y and putting it in terms of y the equation is y=logbx were b is subscripted i just dont know how to do ...
April 26, 2010

Math
What's the difference between sample space and event in a lottery game (where 50 numbers are drawn and you have to guess/pick six numbers?). Can you give examples of both?
April 19, 2010

economics
How is the demand curve for an item that is very responsive to price changes likely to be different from that of an item whose demand is not very responsive?
April 19, 2010

EGYPT
bobpursley what are some of the conflicts the website doesn't work
April 15, 2010

EGYPT
I NEED TO KNOW ABOUT EGYPT THESE ARE THE QUESTIONS THAT I HAVE TO ANSWER: -IS THERE RURAL AREAS -IS THERE ANY CONFLICT(RELIGIOUS,SLAVERY ETC.) -IS THERE ANY POLUTION THAT'S ALL THANK U
April 15, 2010

trig
prove the trig identity cos(4x) = 2-sec^2(2x)/sec^2(2x)
April 14, 2010

6th grade
Kara has a diamond ring. Her ring has a volume of 6cm(to the third power) and a mass of 2g. What is the density of her ring? INCLUDE UNITS!
April 6, 2010

Pre Calculus
The electricity in your house is alternating current because the current varies sinusoidally with time. The frequency of sinusoid is 60 cycles per second. Suppose at Time = 0 seconds the current is at its max of 5 amperes. Write an equation expressing current in terms of time
March 30, 2010

math
The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? (b) If 60 students took the exam, how many got a score between 50% and 70%?
March 28, 2010

math
Explain how to evaluate x-8 when x=10?
March 25, 2010

math
five names for -73
March 23, 2010

Math
Is anyone familiar with base ten? I need to show my work on how I recieved my answer. Write the numeral in base ten. 200six =532
March 21, 2010

algebra
A wheel makes 4 17/20 revolutions per minute. If it rotates for 48 minutes,how many revolutions does it make?
March 20, 2010

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