Sunday
December 4, 2016

# Posts by steven

Total # Posts: 573

Chemistry
How many grams of CH3COOH are present in 2.5^3 of vinegar. Also, what is the formula needed to solve? Thanks!
March 5, 2011

Chemistry
How do I find how many grams of CH3COOH are present in cm^3 of vinegar? Also, how many moles of CH3COOH are present in 2.5 cm^3 of vinegar? Thanks!
March 5, 2011

math
A computer costs \$799. To add memory it costs \$25 for 8 megabytes. How much memory can you add if you have at most \$1,000 to spend.
March 1, 2011

math
Last year's computer model is on sale for \$799. You can add more memory to the computer. Each chip of 8 megabytes of memory costs \$25. How many megabytes of memory can you add if you have at most \$1,000 to spend.
March 1, 2011

math
Last year's computer model is on sale for \$799. You can add more memory to the computer. Each chip of 8 megabytes of memory costs \$25. How many megabytes of memory can you add if you have at most \$1,000 to spend.
March 1, 2011

Math
Because all of the tickets were square!
February 24, 2011

geometry
if ac = 2x + 13 and db =4x - 1, what is db
February 21, 2011

Please check my answers-I have to say where I just came from and what I have done using forms of venir and acabar de The post office Vengo del correo. Acabo de mandar una carta. The museum Vengo del museo de arte. Acabo de mirar el arte. The hospital Vengo del hospital. Acabo...
February 7, 2011

Genetics
Hi, I really need help in how to approach this question: A species of tiny antelope, known as the zephyr, has an XY system of sex determination, similar to mammals. Zephyr males have small antlers and females do not. The antlers can be two pronged (2-pr) or three pronged (3-pr...
February 6, 2011

Math
A computer costs \$799. To add memory it costs \$25 for 8 megabytes. How much memory can you add if you have at most \$1,000 to spend.
January 27, 2011

chemistry
The pH of a solution is 6.0. Explain how the addition of the following substance would alter (or not alter) the pH of the solution. a. HCl b. NaOH c. H20
January 24, 2011

Science
The law of conservation of energy states that energy can neither be created nor destroyed. In many instances it may look as though energy is gained or lost, but it is really only changed in form. How is the law of conservation of energy represented when an archer shoots an ...
January 5, 2011

Physics
For Part B, do (340+200)/2=270 rpm to find the average rpm during acceleration. Then divide this answer by 60 seconds to find the average revolutions per second during acceleration 270/60=4.5 rev/sec. Multiply this answer by the amount of seconds it takes for it to accelerate ...
December 11, 2010

Physics
Ball, with a weight of 200 grams, tied to a string rotates around in a horizontal plane. Period of rotation is 2 seconds. What is the force (in N) which acts on the string? The length of the string is 0.5 meters.
December 8, 2010

Math
how long does it take for a deposit of \$1400 to double at 7% compounded continously it would be awesome if you could also tell me how to do it...
November 9, 2010

calculus
a) -2(x/r) b) Negative c) 2(4.29 / 6400) * 100
November 9, 2010

physics
Can you figure it out now?
October 19, 2010

physics
Velocity is a vector quantity, meaning it has both magnitude and direction. Acceleration is the rate of the change of velocity. Therefore, if the speed changes, the object is accelerating (whether it speeds up or slows down). ALSO- if the object is changing direction, the ...
October 19, 2010

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of ...
October 7, 2010

physics
Kinematics Equations: Vx1 = Vx0 + axΔt (Vx1)^2 = (Vx0)^2 + 2axΔx Δx = Vx0Δt + ½ ax(Δt^2) Using the second kinematics equation, we can solve for Δx. (Vx1)^2 = (Vx0)^2 + 2axΔx Plug in what you know: (45 m/s)^2 = (0 m/s) + 2(9.8m/s^2)(? m...
October 6, 2010

science physics
The speed at which the two objects are approaching each other (from the trains' perspective) is 95 km/h (x 2) = 190 km/h. If they are 7.5 km apart at first, you can set up a proportion: 190 km 7.5 km ------ = --------- 1 hr x hr Cross-multiply the terms and set them equal ...
October 6, 2010

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of ...
October 6, 2010

Physics
I would like to forget the upward component, as the object IS in fact a bullet fired at a fast velocity from a gun towards a target not too far away. However, we're graded on the correctness of our problem solving. And, additionally, this factor WOULD become an issue if we...
October 6, 2010

Physics
That's not entirely correct... That would only be true if the rifle was fired horizontally, giving the x component 460 m/s towards the target. However, that 460 m/s has some UPWARD y component too, reducing the x component by some amount... Thanks, Steven
October 6, 2010

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of ...
October 6, 2010

Physics
Kinematics Equations: Vx1 = Vx0 + axΔt (Vx1)^2 = (Vx0)^2 + 2axΔx Δx = Vx0Δt + ½ ax(Δt^2) Had the distance from the intersection when braking begins not been given: Remaining distance = 140.0 m Current Velocity = 14.8 m/s Reaction time = 0.440 s ...
October 6, 2010

science
what is the defination of a compound machine?
September 20, 2010

physics
A 55 kg student traveling in a car with a constant velocity has a kinetic energy of 1.6 104 J. What is the speedometer reading of the car in km/h?
September 17, 2010

Math
distance problem suzi drove home at 60mph,but her brother jim,who left at the same time, could drive at only 48mph. When suzie arrived, jim still had 60 miles to go. How far did suzi drive?
September 14, 2010

MATH
2 tens 5 hundreds
September 13, 2010

chemistry
Why is the energy for high 2/5 of the energy for the low.
June 30, 2010

Math
a walk up a hill starts at a car park on the 100m contour and climbs steadily to a summet at 240m. on a map with scale 1:25000 the distance along the path from the car park to the summet is 9.6cm. how long it will to reach su,,it and back according to Naismith's rule.
June 20, 2010

statistics
A canidatate for governor of a certain state claims to be favored by at least half of the voters. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis? A. There is not sufficient evidence to reject the claim > or = 0.5 B. ...
June 12, 2010

ALGEBRA
auren and Andrew left Austin at the same time. Lauren traveled east at an average speed of 50 miles per hour. Andrew traveled west at an average speed of 65 miles per hour. How many hours of driving does it take for the two to be at least 500 miles apart? Write an inequality ...
May 26, 2010

Algebra
An elevator went to the do of a 180m building, stayed for 1 minute, then came down. The total time was 3.5 minutes. If the speed of the elevator when it went up was 1 m/sec less than when it came down, find both speeds (up and down).
May 20, 2010

Algebra
Thhe members of a soccer team are to share the \$540 cost of a banquet. When 5 students are unable to attend the cost per student was \$1.50 greater. How many students attended the banquet?
May 20, 2010

algebra
One paving machine can surface 1 km of highway in 6 hours. Another can surface 1 km of highway in 8 hours. how long would it take to surface 1 km of highway with the two machines working together?
May 20, 2010

physics
A 100 kg mass starts from rest at the top of an incline plane that makes an angle of 35 degrees with the horizontal. There is a coefficient of friction of 0.005 between the ramp and the mass. The mass slides down the ramp and then slides to a stop on a surface that the ...
May 14, 2010

physics
A 29 g ice cube at 0.0°C is added to 110 g of water in a 62 g iron cup. The cup and the water have an initial temperature of 25°C. (a) Find the equilibrium temperature of the cup and its contents. i don't understand how the iron cup changes the situation. please help.
April 26, 2010

psychology
Sexual arousal in human begins is different from that of other animals. It is clear that human sexual arousal can occur:
April 23, 2010

algebra 1
April 22, 2010

statistics
we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654 such women. we assumed there that the population standard deviation was known to be 7.5. in fact the sample data had mean BMI of 26.8 and standard ...
April 20, 2010

statistics
at the census bureau web site you can find the percent of adults in each state who have at least a bachelors degree. it makes no sense to find the mean for these data and use it to get a confidence interval for the mean percent U in all 50 states. Why not?
April 14, 2010

statistics
if young men thought that their own level of muscle was about what women prefer, the mean "muscle gap" in the study would be 0. we suspect that young men think women prefer more muscle than they themselves have. a)what is the value of he test statistic Z? b)you can ...
April 13, 2010

penniman
what is the estimate quotient for 233 divided by 6?
March 30, 2010

chemistry
identify the atoms that are being oxidized and reduced.. 2FeCl3 + 2KI --> 2FeCl2 + 2KCl + I2
March 29, 2010

statistics
in a test for esp a subject is told that cards the experimenter can see but he cannot contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has ...
March 24, 2010

statistics
a binomial distribution will be approximately correct as a model for one of these two sports settings and for the other. explain why by briefly discussing both settings. a)a national football league kicker has made 80% of his field goal attempts in the past. this season he ...
March 24, 2010

statistics
slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops spinning; the three wheels ...
March 23, 2010

stats
slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were like this: you pull the lever to spin 3 wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops spinning; the three wheels ...
March 23, 2010

stats
you have torn a tendon and are facing surgery to repair it. the surgeon explains the risk to you: infection occurs 3% of such operations, the repair fails in 14%, and both infection and failure occur together in 1%. what percent of these operations succeed and are free from ...
March 23, 2010

math
So would the ordered pair be (1,4)?
March 21, 2010

math
Solve using elimination method x+5y=21 -x+5y=19
March 21, 2010

math of investment
Jane will win at least \$5
March 20, 2010

Chemistry
Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the over all ionic equation, and the net ionic equation for this reaction. If 16.06g of copper(II) chloride react, what is the maximum amount of ...
March 16, 2010

chemistry
What volume of 0.123 M K3PO4 is required to react with 60 mL of 0.862 M MgCl2 according to the equation 2K3PO4+3MgCl2--> Mg3(PO4)2+6KCl Answer in units of mL.
March 10, 2010

physcis
23meters
March 4, 2010

How can blood type A donate to AB???
I know my reasoning is flawed but I just can't figure out in what sense is it flawed. once again, if I apply my logic... type O has no antigens and A and B antibodies. IF you donate type O to type A, B, or AB, it wouldn't work! cuz the A and B antibodies from type O ...
February 10, 2010

How can blood type A donate to AB???
From my understanding, blood type A has A antigens and B antibodies. Blood type AB has A and B antigens and no antibodies. If someone donates type A to type AB, wouldn't the antibody B from type A attack the antigens B from AB??? I know I am looking at this incorrectly but...
February 10, 2010

Propagation of error and sig. figs
To summarize my messy post, I am unsure how to write my final answer
January 22, 2010

Propagation of error and sig. figs
I'm really embarrassed to ask this! I knew how to do it before but I forgot after 2 years. I remember learning it for analytical chemistry :( So a basic problem: What is x= a+b+c? given that: a= 100.7 +/- 0.05 b= 0.61 +/- 0.005 c=226 +/- 0.5 OK. My question is the ...
January 22, 2010

english
What nursery rhyme character was a "wise galoshes wearing feline" answer has 12 letters.
January 20, 2010

What is matter made up of?
January 17, 2010

science
Does lighting occur when charges jump between the thunder cloud and the positive ground as a discharge?
January 16, 2010

Science
Is discharge of static electricity from a huge cloud called a thundercloud?
January 16, 2010

Is all matter made up of tiny particles too small to see
January 16, 2010

math
if the altitude of a triangle is doubled and the base is multiplied by 3,what is the effect on the area?
January 12, 2010

accounting
You are provided with the following transactions that took place during a recent fiscal year. Complete the table indicating whether each item (1) should be reported as an operating (O) activity, investing (I) activity, financing (F) activity, or as a noncash (NC) transaction ...
December 7, 2009

Calculus
Suppose a cylindrical can is manufactured with radius r. The manufacturing process makes the length r imprecise; r can be off by ±0.03 cm. The manufacturing process makes the height of the can precisely equal to three times the radius r (including any error in r, but ...
December 4, 2009

algebra
72 students is 90% of how many students
November 17, 2009

math
Find the percent using the percent proportion 75 rolls is what percent of 1000 rolls
November 17, 2009

math
Identify the percent,whole , and part in the following 30% of 730 is 219 do not solve for any unknowns Percent= Whole= Part=
November 17, 2009

math
A michigan orchard made 11,491lb of taffy apples with approximately 1lb of taffy mixture for each 76.7 pounds of apples. To the nearest tenth of a pound, how many pounds of apples and how many pounds of taffy were used
November 16, 2009

MO theory regarding heteronuclear diatomic molecul
Hi all I am having trouble finding the MO order for heteronuclear diatomic molecules: In my textbook, heteronuclear order is listed as: 1o 2o 3o 4o 1pi 5o 2pi 6o where o = sigma When I first saw it, I was confused; how can the above be correct? If one were to calculate bond ...
November 11, 2009

how many molecules do you have in 64g of CO?
November 11, 2009

Term symbols for ground states
Dr Bob, Thank you so much!! You have taught me something in mere minutes that my professor failed to do in a single lecture. And thank you again for the web site. I had no idea such a site existed! I wish there was a karma/rep system :) thanks again
November 5, 2009

Term symbols for ground states
OHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH. if it was 8e- in d orbitals (5 of em) it would be +2 +1 0 -1 -2 for up spin , then +2 +1 and 0 for down spin! therefore, total is 3 and L=3!!!! I hope this is correct!
November 5, 2009

Term symbols for ground states
Thank you Dr Bob. Yes, I am seriously confusing myself haha As far as the 4d8 is concerned, I was referring to Ni2+ it has 8 electrons it occupies 2, 1, 0, -1, -2 so would that make L = 0 which is S? Sorry for the confusion. I greatly appreciate you staying and helping me ...
November 5, 2009

Term symbols for ground states
what about Nb2+ then? it has 8 electrons it occupies 2, 1, 0, -1, -2 so would that make L = 0 which is S?
November 5, 2009

Term symbols for ground states
But for Nb2+ where it is 4d^3 Shouldn't L be D instead of F? Like p^2 in carbon, L = P And in s^2, L = S ------ Or am I going about this the wrong way?
November 5, 2009

Term symbols for ground states
You are correct DrBob. Error on my part.
November 5, 2009

Term symbols for ground states
I have having difficulty understanding where L comes from in term symbol notation For Carbon, e- configuration is 1s^2 2s^2 2p^2 p corresponds to l=1 overall spin is 3/2 since cell is less than half-full, J=S=3/2 so term symbol is 4 P (3/2) this i understand where P came from...
November 5, 2009

Quantum mechanics, eigenvalues, eigenfunctions
I'll also like to thank Dr. Physics for helping me last time :)
October 22, 2009

Quantum mechanics, eigenvalues, eigenfunctions
What exactly is an eigenvalue? "To be an eigenfunction, the operator has to reproduce the function with some multiplicative constant." Is the eigenvalue the multiplicative constant -or- is it the m constant and the function? Many thanks.
October 22, 2009

statistics
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour fight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? Show all steps ...
October 9, 2009

Quantum mechanics, eigenfunctions!
Thank you! I thought I was going crazy because I wasn't able to an eigenfunction since 1st deriv. would be = cos(x)*e^(ax) + a*sin(x)*e^(ax) which is definitely not an eigenfunction of the operator.
October 8, 2009

Quantum mechanics, eigenfunctions!
Determine if the function sin(x)*e^(ax) where a=constant is an eigenfunction of the operators d/dx and d^2/(dx)^2 Okay. My understanding is that you use the operator and perform its "thing" on the function. In this case, you will have to find the 1st derivative of ...
October 8, 2009

social studies
what imapct did the enstablishment of french and dutch coloies in north america have on native americans?
September 29, 2009

How did Canadian Inuits make their decisions. Also did the have a leader or chief and how were they chosen
September 26, 2009

biology
identify what all organic compounds have in common,and list the four principal classes of or organic compounds
September 23, 2009

Physics AP C
Two trains, each having a speed of 22 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 70 km apart and heads directly for the other train. On reaching the other train it flies directly back to...
August 26, 2009

Fundamental Cornerstones of Managerial accounting
Green Enterprises produces small engines for lawn mowers. during the year, 110,000 engines were produced. The actual labor used was 60,000 hours at \$9.50 per hour. Green has the following labor standard: 0.5 hour at \$10 1. compute the labor rate variance. 2. compute the labor ...
July 30, 2009

Chemistry
Write the net ionic equation for silver nitrate and sodium chloride. I only know how to do it when it deals with elements, not compound.
July 23, 2009

math
x*y=50 x/y=2 10*5=50 10/5=2
July 19, 2009

math
A right triangle has a hypotenuse of length 3.00 m, and one of its angles is 30.0°. What are the lengths of (a) the side opposite the 30.0° angle and (b) the side adjacent to the 30.0° angle?
July 19, 2009

math
A painting measuring 100cm by 55cm is to be framed with a matte border of uniform width surrounding the painting. the combined area of the picture and the matte is 9796cm^2. How wide is the matte border?
July 12, 2009

math
A rectangular field is to be enclosed by a fence. Two fences parallel to one side of the field divide the field into three rectangular fields. If 2400m of fence are available find the dimensions giving the max area.
July 12, 2009

math
solve for x 3x^2-18x=0
July 12, 2009