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December 21, 2014

Posts by Matt


Total # Posts: 1,930

Physics
A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 145.0 mm from the central spin axis, and if the machine hits 46500 rev/min, what would be the centripetal force exerted on a giant amoeba of ...
February 11, 2012

MAth Probability
Determine the probability of each of the following types of poker hands a. Two pairs (two cards of one denomination, two cards of a different denomination, and one card of a denomination other than those two denominations) b. One pair (two cards of one denomination and three ...
February 9, 2012

Math Probability
A math class has 20 students who choose a topic from a list for an essay. How big pool is necessary for the probability of at least one duplicate to drop below fifty percent? I understand it is like the birthday problem, I just do not understand how to solve it still.
February 9, 2012

Math Probability
What is the probability that a student applied to THREE OR MORE colleges? with the chart Num. Applied Probability 1 .17 2 or less .29 3 or less .43 4 or less .59 20 or less 1
February 9, 2012

Math
A math class has 20 students who choose a topic from a list for an essay. How big pool is necessary for the probability of at least one duplicate to drop below fifty percent?
February 8, 2012

intermediate algebra
The third angle in an isosceles triangle is 1/2 as large as each of the two base angles. Find the measure of each angle.
February 5, 2012

intermediate algebra
The third angle in an isosceles triangle is 1/2 as large as each of the two base angles. Find the measure of each angle.
February 5, 2012

Physics
A 6490 kg helicopter accelerates upward at 0.59 m/s2 while lifting a 1180 kg car. (a) What is the lift force exerted by the air on the rotors? N (b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
February 2, 2012

chemistry
thanks
February 2, 2012

chemistry
how would i set this up? chelste's diet restricts her intake of protein to 24 g per day. if she eats an 8.0 oz burger that is 15.0% protein, has she exceeded her protein limit for the day? How many ounces of a burger would be allowed for chelste?
February 2, 2012

Math: Algebra
Landon can climb a certain hill at a rate that is 2.5 mph slower than his rate coming down the hill. If it takes him 6 hours to climb the hill and 45 minutes to come down the hill, what is his rate coming down?
February 1, 2012

physics
If someone kicks a soccer ball across a flat parking lot with an initial velocity of 19.0m/s @ 19 degrees, how long will the soccer ball be in flight and how high above its launch point will the ball go? What would be the x and y components of this velocity at t=0.
January 31, 2012

trig
Prove (1+secx)/(tanx+sinx)=cscx
January 31, 2012

Trig
Solve the following trig equation 2cos(x-π/6)=1
January 31, 2012

Trig
Prove (1+secx)/(tanx+sinx)=cscx
January 31, 2012

Calculus
Consider the curve -8x^2+5xy+y^3=-149 1. Find Dy/dx 2. write an equation for the line tangent to the curve at the point (4,-1)
January 30, 2012

math
The day started out at 16 F and ended at 25 F. Find the percent change for the temperature throughout the day?
January 29, 2012

anatomy
I have tried to search this and I can't find anything on this. Can you please help?? Name the structures that can be seen in the elastic cartilage?
January 26, 2012

chemistry
how much ice would i have to eat to l lose 10% of my body weight?
January 22, 2012

phyics 2
Remarks The gravitational force between the charged constituents of the atom is negligible compared with the electric force between them. The electric force is so strong, however, that any net charge on an object quickly attracts nearby opposite charges, neutralizing the ...
January 19, 2012

Economics
4. Which of the following statements are positive in nature and which are normative? a. A tax cut will raise interest rates. I think it is Normative Economics
January 17, 2012

math
Jason bought a laser printer that regularly sells for $ 649.99AT THE MARKDOWN RATE OF 35%.What is the final selling price
January 6, 2012

Excel
The correct answer is A - Styles gallery.
January 5, 2012

math
what are these words unscrambled: untoegrnc visteiop unrlerpadecpi please help
January 2, 2012

chemistry
Balance the equation NH3 + O2 −→ N2 + H2O Given 4.55 mol of the reactant NH3, determine the corresponding amount of O2.
December 19, 2011

Physics
A 145 m long ramp is to be built for a ski jump. If a skier starting from rest at the top is to have a speed no faster than 22 m/s at the bottom, what should be the maximum angle of inclination?
December 16, 2011

Physics
It takes 0.220 s for a dropped object to pass a window that is 1.14 m tall. From what height above the top of the window was the object released?
December 16, 2011

Biology
What is the difference between thromboplasin and factor Xa? I have in my notes that they both convert prothrombin to thrombin.
December 13, 2011

Algebra
Solve: squareroot 2x-1 - squareroot x+3 = 1 please show steps
December 13, 2011

Algebra
Solve (x-1)^2 = 16 please show steps
December 13, 2011

alg II
linear functions if g(fx) = 2x+6 f(gx) is a line through origin what is f(g2011)
December 13, 2011

ALGEBRA
Solve (x-1)^2 = 16 show steps
December 12, 2011

Algebra-HELP
Solve: squareroot 2x-1 - squareroot x+3 = 1 show steps
December 12, 2011

Physics
A bathtub of icy water at 32 degrees farenheit holds 17 gallons. You put in a 25 pound watermelon with a temperature of 100 degrees farenheit. If you wrap the tub completely in blankets so it does not lose any heat, what will be the final temperature of the watermelon? (...
December 11, 2011

Physics
80*1kg?
December 11, 2011

Humanities
Why does a teacher needs to have a grasp of students social setting and the condition in which they live?
December 11, 2011

accounting
What is the acid test ratio? Is it the same thing as the quick ratio?
December 9, 2011

Math
Bond : Face Value = 100,000 State Rate = 9% Semi-annual Payments Term = 3years Market Rate of 12% Amortize the bond to determine: Year 1 Interest Expense End of Year 1 carrying value. My Answers: Year 1 Interest Expense = 5,621.05 End of Year 1 carrying value =94,805.14 Am I ...
December 7, 2011

algebra
3x-y=25 x+4y=-22 3x-y=25 -3x-12y=66 -13y=91 y=-7 x+4(-7)=-22 x=6
December 4, 2011

Physics
Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
November 30, 2011

physics
A 2.9 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.0 with the horizontal. An average frictional force of 4.2×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.6 m...
November 29, 2011

Math
Reduce the fraction to simplest form 2x+2/6x^2+16x+10 (the 6x is squared I think thats how you show it)
November 28, 2011

math
the third and fourth terms of the sequence are 21 and 38. If the second differences are a constant 2, what are the first five terms of the sequence?
November 22, 2011

Chem
Oh, alright. I'm sorry then. XD
November 21, 2011

Chem
Why wont you answer my previous q Dr. Bob? D:
November 21, 2011

chemistry-help!
The initial rate of reaction for H2O2(aq) <-> H2O (l) 1/2 O2 (g) is found to be 1.7x10(-3)M/s. Assume that this rate holds for 2 minutes. Start with 160ml of 1.60 M H2O2. How many milliliters of O2 measured at 24C and 760mmHg , are released from solution in the first ...
November 21, 2011

Chem-Repost
it wouldn't let me post after putting spaces in the url and everything, so i just copied and pasted the q instead :P sorry for all the messyness. i'll see if i can delete q's, in the mean time you can maybe look at this please? Initial rate of rxn of H2O2(aq)->...
November 20, 2011

Math
7/8 is about 1, 3 1/4 is about 3, 1+3=4? And follow the same pattern for th rest. That's how i would estimate it :s And an example for division is 9 5/6 is about 10, 2 1/8 is about 2, 10 / 2 = 5. Hopes this helps
November 20, 2011

Chemistry
Using grammatically correct English sentences describe how the nature of the bonding in MgF2 (s) and Zn(s) differ. (Don't just name the different types of bonding-describe how they are different. Which of the following are metallic? F2(g), Co(s), NaCl(s), H2O(s), C6H6(l) (...
November 20, 2011

physics
A 83-kg worker clings to a lightweight rope going over a lightweight, low-friction pulley. The other end of the rope is connected to a 66-kg barrel of bricks. If the worker is initially at rest 16 m above the ground, how fast will he or she be moving when he or she hits the ...
November 20, 2011

Chemistry
It doesnt let me link stuff :c But its the chemsitry toughhh q And i hope you are not typing the answer while i post this XD (sorry if thats the case) Thanks again
November 20, 2011

Chemistry
I just wanted to clarify that although Cody did respond to my question, we were still unable to determine the solution. I will post a link to the question in a minute. (i noticed you replied to the other posts a bit ago, but i hope im not being too abrupt. Just verifying :P)
November 20, 2011

physics
im guessing PE is potential energy eqn is PE=mgh 20N is weight of cat, which is equal to Fg, which really is Fg=mg so simply mgh=20x5=100. The cat's kinetic energy is = .5mv(2) (the two is a superscript, meaning the v is squared) Regardless it's velocity is = to 0 when...
November 19, 2011

Physics
m1v1=m2v2 You have mass and velocity of car (lets designate that m1 and v1) and mass of ball (lets say thats m2). Solve for v2.
November 19, 2011

Physics
Its another momentum problem similar to your other post. Since there is only two 'fragments' from the 'explosion' :P you can disregard the angle for the velocity and act like they are horizantal to each other. If you dont want to disregard the angle, then you ...
November 19, 2011

Physics
Use the eqn: v1'=v1*(m1-m2)/(m1+m2) M2=neutral car, its v2=0 since its at rest. m1=truck, v1=11.5. Then, once you have v1' you can sub it into m1v1+m2v2=m1v1'+m2v2' and find v2'. The first eqn is a special eqn only to be used when v2=0 and the collision is ...
November 19, 2011

physics emergerncyy!
use the eqn v2'=v1(2*m1/(m1+m2)) This eqn is specially derived fro elastic collisions where v2=0. The speeds should be components; north, south, east, west or up, down, leftm, right etc. Anyways, find the components and then use pythagorean theroem. (once you have v1, you ...
November 19, 2011

chemistry_toughhhh
No it's balanced. you're allowed to have fractions in teh equation. Uncommon yes, but not impossible. Nice try though :P
November 19, 2011

chemistry_toughhhh
Initial rate of rxn of H2O2(aq)->H2O+ 1/2 O2(g) is found at 1.7x10(-3)M/s and is constant for 2min. You start with 160ml of 16M H2O2. How many mL of O2 in one minute? (Measured at 273K and 760mmHg). I tried to find the new conc of H2O2 via NewConc= Old conc - kt Then i ...
November 19, 2011

algebra
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. 35 said they drove alone. 38 rode in a carpool. 33 rode public transportation. 5 used both carpools and public transportation. 4 used both a carpool and sometimes ...
November 19, 2011

Systems Analysis, Design, and Implementation
May anyone help me on this 1- what are the Disadvantages of Structure Analysis? 2- what are the Disadvantages of Object-Oriented Analysis? Thanks
November 17, 2011

geometry
Triangle XYZ above is similar to triangle UVW (not shown). If the length of one side of triangle UVW is 60, then what is one possible perimeter of triangle UVW?
November 15, 2011

Chem-BufferQ
Praise the lord. Thank you, i am forever greatful. Kinda pissed that i had the answer alll along and just thought it was in M, not moles. Otherwise i would have known to divide it. But owells, i can't thank you enough man, you're too good :DDDDDDDDDD
November 14, 2011

Chem-BufferQ
You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving for the ...
November 14, 2011

chemistry-Buffer Q
You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving for the additino...
November 14, 2011

astronomy
At an average opposition, the Earth and Mars are separated by 0.52 AU. Suppose an astronomer observes Mars at opposition and that seeing blurs the images to a resolution of 1.0 seconds of arc. What is the smallest surface feature the astronomer would be able to resolve on Mars...
November 14, 2011

english
danke schoen
November 14, 2011

english
Are the following sentences fragments, run-on or complete sentences? 1.You better believe what I say to be true. 2.Listen carefully to what the teacher has to say. 3. I have always wanted to live in England, but I am afraid I will only get to visit at this point in time.
November 14, 2011

Chemistry
which contains the lowest % of hydrogen? HCl H3PO4 H2SO4 H20 is it HCL?
November 13, 2011

Chemistry
A sample of C3H8O that contains 200. molecules contains ________ carbon atoms.
November 13, 2011

Chemistry
True or false? 1 mole of ozone has 1.8 x 10^24 atoms? correct if wrong THANK YOU!
November 13, 2011

Geometry
If 3 us an element of A and 3 is not an element of B, then which of the following is NOT true 3 is an element of B complement 3 is an element of A union B 3 is an element of A intersect B
November 13, 2011

Chemistry-Common ions
Wow im an idiot XD thanks. And i dont want to be a nuisance, but how would i do the next question? 0.320M (NH4)2SO4 and 0.492M NH3 (Still looking for OH- conc) Would i find the H+ concentration from the double dissociation of the NH4compound? (i know how to find the oh from ...
November 13, 2011

Chemistry-Common ions
Woooo! the easy way was correct c: Thanks man. But i still kinda don't know why you just doubled it. I thought it would havesomething to do witht he ice table and such since it was in the common ion+buffer chapter :s Care explaining or?
November 13, 2011

Chemistry-Common ions
c=Calculate the OH- conc in a solution containing 6.2x10(-3)M Ba(OH)2 and 1.00x10(-2)M BaCl2? I thought of using the BaCl2 conc to find the conc of Ba initially, then use that in the ice table for Ba(OH)2, and solve for OH. But i dnot think that's right. Help? :/
November 13, 2011

Chemistry
Predict whether the following reactions will be exothermic or endothermic A.] N2 (g) + 3H2 (g) --> 2NH3 (g) B.] S (g) + O2 (g) --> SO2 (g) C.] 2 H2O (g) --> 2 H2 (g) + O2 (g) D.] 2 F (g) --> F2 (g) Bond ________ ∆H˚ (kJ/mol) H-H _________ 432 N(triple)N ...
November 9, 2011

Precal
.Pump Jack Problem: An oil well pump jack is shown in Figure 3-9f. As the motor turns, the walking beam rocks back and forth, pulling the rod out of the well and letting it go back into the well. The connection between the rod and the walking beam is a steel cable that wraps ...
November 8, 2011

Chemistry
Calculate the mass ( in grams) of one mole of methane molecules (to .01 g)
November 1, 2011

English
I think intact is better but i'm not sure. Either one sounds just as rght to me.
October 31, 2011

English
The accident occurred on a/an ______ road A. intact B. enlisted C. isolated D. forging I know what all the words mean I just don't know which one is best. I thing it is wither isolated or intact. Help would be immensely appreciated.
October 31, 2011

Probability
Reformatted so that it's easier to read. I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year...
October 30, 2011

Mathematics (Probability, Statistics, etc.)
I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year lapse in education, so my skills are really ...
October 30, 2011

Physics
a) Density of H2O = 1E^3 = 1000kg/m^3 Pair = 101.3 = 101300 Pa Pwater = (Density of H2O)*Depth*gravity Ptotal = Pair + Pwater b) diameter = 33.1cm r = 1/2 diameter Area = pi*r^2 Force = Ptotal * Area
October 27, 2011

Math
When log s (as ordinate) is plotted against t (as abscissa) on linear paper, the graph is a straight line with slope of -2.1 and intercept of 1.5. Express the relationship between s and t as s = Aekt . If s represents a distance in meters and t a time in seconds, what are the ...
October 25, 2011

Math
Rewrite y = 5(10^(−3x)) in the form y = Ae^(mx). (i.e., determine A and m)
October 25, 2011

Math
Rewrite y = 5(10−3x) in the form y = Ae^(mx). (i.e., determine A and m)
October 25, 2011

Math
A pathologist, trying to identify a bacterial infection, places a sample in a growth chamber and measures 1000 bacteria at the end of day 5 of the test. From daily measurements, the growth rate of the number of bacteria is determined to be 5% per day. Note that: A linear ...
October 25, 2011

Math
Find a system of linear equations corresponding to the following augmented matrices: (a) 2 0 |0 3 −4 |0 0 1 |1 (b) 3 0 −2 |5 7 1 4 |−3 0 −2 1 |7 (c) 7 2 1 −3 |5 1 2 4 0 |1 (d) 1 0 0 0 |7 0 1 0 0 |−2 0 0 1 0 |3 0 0 0 1 |4
October 25, 2011

Math
Find the augmented matrix for each of the following systems of linear equations: (a) 3x1 − 2x2 = −1 4x1 + 5x2 = 3 7x1 + 3x2 = 2 (b) 2x1 + 2x3 =1 3x1 − x2 + 4 x3 = 7 6x1 + x2 − x3 = 0 (c) x1 + 2x2 − x4 + x5 =1 3x2 + x3 − x5 = 2 x3 + 7x4 =1 (d...
October 25, 2011

Math
Which of the following are linear equations in x1, x2 and x3? (a) x1 + 5x2 − (2^0.5)x3 =1 (b) x1 + 3x2 + x1.x3 = 2 (c) x1 = −7x2 + 3x3 (d) x1^−2 + x2 + 8x3 =5 (e) x1^3/5 − 2x2 + x3 = 4 (f) πx1 − (2^0.5)x2 + 13x3 = 7^1/3
October 25, 2011

Physics
A small aircraft has a flying speed of 200 km/h in still air. To make a trip from Saskatoon to Regina, a straight line distance on the map of 250 km, a pilot must first determine the wind velocity and then calculate what direction to fly (the 'heading') to compensate ...
October 25, 2011

english
Ingrate Credible
October 25, 2011

Science
You throw a rock horizontally off a cliff with a speed of 10 m/s. after 3.1 seconds, how far were you when threw the rock?
October 21, 2011

physics
im talking about the ones asked at 7:55 and 7:57...please
October 20, 2011

math
bob can u please answer my physics questions
October 20, 2011

Math
32 tiles left over
October 20, 2011

algebra 2 word problem
yes both are right
October 20, 2011

aLgEbrA variable & expression
your welcome
October 20, 2011

aLgEbrA variable & expression
yes those are correct
October 20, 2011

Mathematics!
A cereal factory has weekly fixed costs of $48,000. It costs $1.37 to produce each box of cereal. A box of cereal sells for $3.99. Express the profit function p(x) that gives the total weekly profit from x boxes of cereal.
October 20, 2011

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