Tuesday

May 3, 2016
Total # Posts: 1,139

**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*

**Psychology**

Dr. Ahmed strongly believes that people are not controlled by their environment, but that everyone has personal strengths and an ability to positively grow. The ______ perspective best summarizes Dr Ahmed’s approach. humanistic psychodynamic cognitive evolutionary i think...
*October 9, 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*

**Physics**

Not gonna tell you the answer directly, but you need to use Trig to find its X & Y velocity. Find the difference between the x axis of the vertex & tramp. Calculate the time according to the horizontal velocity. And take that time multiply it with the gravity
*September 30, 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*

**geometry**

Find the area of the top of a slice of pizza pie with a diameter of 18 inches cut into 8 slices
*September 14, 2010*

**Geometry**

Find the measure of an angle that is 8 degrees less than 3 times its supplement.
*August 30, 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*

**chemistry**

60.8
*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*

**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*