Wednesday
April 16, 2014

science
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=3.591 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Saturday, November 17, 2012 at 7:24am

chem
1st I took 1.126e9 and multiplied it by 1.67262158e-27 kg to get your mass of 1.8833719e-18 kg. Then I did my dimensional analysis and had ((6.626e-34 J*s)*1s*100cm)/((1.8833719e-18 kg)(3.35e4 cm)*1m) and I got an answer of 1.05e-18 m using 3 sig figs. :)
Thursday, November 15, 2012 at 9:25pm

I have a 90 average i just got a 50 on my mid-term what is my grade average?
Saturday, November 10, 2012 at 11:38am

Math
since there is no restriction on the first card, p(pair) = p(2nd card is same value as 1st card) p(pair) = 1 * 3/51 = 1/17 p(no pair) = 16/17
Thursday, November 8, 2012 at 2:13pm

yeah this is sooooo hard, does anyone understand? I got to do this for problems 14.-19. Its 7th grade math work page 4.5 Anyone got the same?
Tuesday, November 6, 2012 at 1:00pm

You still haven't formed your essay like this: 1st paragraph - introduction including thesis statement at the end 2nd paragraph - all about one of the comparable items 3rd paragraph - all about the other of the comparable items 4th paragraph - conclusion To make sure ...
Saturday, November 3, 2012 at 4:11pm

Chemistry
1st find the heat of water in Joules. Heat absorbed by water is heat lost by metal. Use this to find Specific heat of metal: SH = J/mass*Change in Temp of metal SH = 640.152J/40g*41C SH = 390.33658854 x 10^-3 SH = .390 J/gC It's not gold whose SPHeat is .131...it is likely...
Thursday, November 1, 2012 at 5:31pm

math
Ms.Sue, is the answer for the 1st question was 150/3.25=? Thank you Ms. Sue my second questions is Rebeckah is an elementary school teacher. she is making an individual craft project kits that requires 2/3 of a cup of water to complete. How many cups of water will she needs if...
Wednesday, October 31, 2012 at 1:47pm

math
12 pounds of A grade coffee and 8 pounds of B grade coffee.
Tuesday, October 30, 2012 at 9:47am

Calculus
I will do the 2nd one, .... f'(x) = lim ( (x+h)^2 - x^2 )/h , as h --> 0 = lim (x^2 + 2xh + h^2 - x^2)/h = lim (2xh + h^2)/h , as h -->0 = lim 2x + h , as h --> 0 = 2x for the 1st one, you should get 1
Monday, October 29, 2012 at 8:53am

MATH
for 30 days on the 1st daY I GET A PENNY THAN ON IT DUOBLES EVERY DAY UNTIL DAY 30 HOW MUCH PENNIES DO I HAVE ON DAY30
Monday, October 29, 2012 at 12:36am

Math
Still not enough information. you said "In 2010 I loaned Johnnie \$5000.00" When in 2010 ? On Jan1 ? on March 14th? you have to know the number of days from the day the load was made to when the 1st payment was made, e.g. suppose there were 65 days between the day the...
Thursday, October 25, 2012 at 7:38pm

Frank saved 50% by purchasing his airline ticket early. His wife paid full price. If their total was \$294 how much was Franks's ticket only? Can someone please explain this to me in 5th grade terms.
Wednesday, October 24, 2012 at 2:40pm

math
So "another letter" means, the same letter cannot be repeated 26 choices for 1st letter 9 choices for the number 25 remaining choices for the last letter. what is 26 x 9 x 25 ?
Tuesday, October 23, 2012 at 9:59pm

I'm sorry, Delilah, but I didn't learn this when I was in 7th grade over 60 years ago. And I didn't take enough math after that to learn graphing.
Sunday, October 21, 2012 at 6:33pm

Math Statistics
The table below shows Rico’s grades during the third term in four subjects. Subject Units Grade Math 1.5 98 Science 2 97 English 1.5 95 A.P. 1 99 What was Rico’s average grade in the four subjects?
Friday, October 19, 2012 at 11:30pm

real easy with algebra .... 55+x = 4(7+x) 55+ x = 28 + 4x 27 = 3x x = 9 but grade 5 ???? make two colums of their ages, going up one at a time, until the first is 4 times the second 55 7 56 8 57 9 58 10 59 11 60 12 61 13 62 14 63 15 64 16 ---- ah, 64 = 4(16) ---> 55+9 = 4(7+9)
Friday, October 19, 2012 at 9:24am

Statistic
Number of Absences Final Grade 0 93 1 93 2 77 3 68 4 65 5 54 - Find the correlation coefficient for the data. I got this part of my answer. I believe the answer to be -0.9767 I am just going crazy with the second part. - Find the equation for the regression line for the data, ...
Thursday, October 18, 2012 at 9:18pm

lens surface
A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens? Do I calculate the ...
Thursday, October 18, 2012 at 10:26am

I am trying to think how I would have done this in grade 7. I assume you have not had permutations, combinations and factorials. make a table of combinations first person shakes hands with 9 --> 9 projects second with 8 --> 8 more third with 7 --> 7 more etc 9+8+7+6+5...
Thursday, October 18, 2012 at 5:06am

math 6
1st week : 4 2nd week : 4 x 4 = 16 3rd week: 16 x 4 = 64 4th week: 64 x 4 = 256
Wednesday, October 17, 2012 at 12:51pm

math
could be RR GG or BB , assuming the 1st marble is not returned prob(RR) = (8/16)(7/15) = 7/30 prob(GG) = (6/16)(5/15) = 1/8 ..... add them up. I am sure you can handle the rest
Tuesday, October 16, 2012 at 9:20am

Math
2nd: 2y + 6a - 4x = 0 you want to "isolate" the y, so everybody else to the other side 2y = 4x - 6a divide each term by 2 , (you only divided one term and not the others) y = 2x - 3a the 1st: y - 5 = (1/3)(x-9) y = (1/3)x - 3 + 5 y = (1/3)x + 2
Thursday, October 11, 2012 at 9:35pm

trigonometry
1st: putting all over a common denominator, = (cos^2 + (1+sin)^2)/(cos(1+sin)) = (cos^2 + 1 + 2sin + sin^2)/(cos(1+sin)) = (2 + 2sin)/(cos(1+sin)) = 2/cos = 2sec
Thursday, October 11, 2012 at 3:10pm

Algebra
sub the 2nd into the 1st 2n - 11 = m/4 2(m/-3) - 11 = m/4 multiply each term by 12 -8m - 132 = 3m -11m = 132 m = -12 then n = (-12) / -3 = 4
Thursday, October 11, 2012 at 8:42am

c++
Your Mathematic school teacher want to use a program that can read the name and the mark of a student. Your teacher want the program to automatically find the grade of the mark and display the result(name, mark and grade). Help your teacher to develop a program that can solve ...
Thursday, October 11, 2012 at 5:16am

7th Grade x y input output tables
i need help with x and y input output tables for 7th grade i dont understand what 5x means or what to do! Math hw problems: 1. y=4x+3 x=1,2,5,10,20 2.d=3.5t t=1,2,5,10,20 Please help ASAP!!!!!
Tuesday, October 9, 2012 at 7:14pm

pre calculus
I would use substitution to start: from the 3rd: z = 13y + 2 into the 1st: 3x - 10y + 13y + 2 = 5 3x + 3y = 3 x+y=1 into the 2nd: -4x + 9y - 13y - 2 = -6 -4x - 4y = -4 x + y = 1 Ahhh, x+y = 1 and x+y = 1 don't have a real solution. So the system has no unique solution. ...
Sunday, October 7, 2012 at 7:53pm

Even when I occasionally taught a section of 7th grade math over 20 years ago, irrational and real numbers were not part of our curriculum.
Friday, October 5, 2012 at 7:45pm

statistics
You are given the following data. Number of Absences Final Grade 0 95 1 91 2 82 3 69 4 67 5 58 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Thursday, October 4, 2012 at 11:05am

Math
Ohk so it will be - 1st glove - 20 2nd glove - 18/19 3rd glove - 17/18 4th glove - 16/17 5th glove - 15/16 Total probability = 1 - the probability of above things right ??
Wednesday, October 3, 2012 at 9:44pm

Math - Need urgent help!
1200 = 0.0333 * assessed value assessed value = .4 * market value solve the 1st equation for the assessed value, then plug this number into the second equation and solve for the market value
Wednesday, October 3, 2012 at 6:49pm

Ahhh, this would be so easy with algebra as was shown by Ms Sue and Shelley, but I guess we can't use algebra for a grade 3 How about making two columns where the two numbers add up to 25 until we see a difference of 9 e.g. 10 15 ----> difference is 5 9 16 ----> ...
Tuesday, October 2, 2012 at 6:08pm

Consumer Math
assuming (a) the deposit was made at the beginning of the 1st quarter (b) the interest is credited quarterly then after two quarters (the beginning of the third quarter), the balance is 1400(1+2*.0675/4) = 1447.25
Tuesday, October 2, 2012 at 11:42am

math
there are 15 boys and 18 girls in fifth grade. Find the ratio of boys to girls in fifth grade.(how do I get the answer) can someone show me how to work the problem
Monday, October 1, 2012 at 8:52pm

MATH
tHERE ARE 4 FIFTH GRADE CLASSES IN A SCHOOL. EACH CLASS Has 24 STUDENTS. fOR EACH GYM PERIOD, TWO FIFTH GRADE CLASSES TAKE GYM TOGETHER. tHERE ARE 10 GYM PERIODS IN ALL DURING SCHOOL WEEK. wHAT INFORMATION IS NOR NEEDED TO FIGURE OUT HOW MANY TOTAL STUDENTS TAKE A GYM PERIOD ...
Monday, October 1, 2012 at 8:01pm

biology
what statement describes the 1st step of ecological community it is known as? A. reed plants attract dragonflies and mayflies. B. frogs and snakes arive after emergent plants are established. C.climax trees such as ash and beech appear and eventually dominate the area. D. ...
Monday, October 1, 2012 at 7:22pm

math
not a Q but wanted to say tks for help last nite. I'm 9 & live w/ my two 10y/o nephews AND we are in the same 4th grade class. We needed help and we all wanted a chance to post on this awesome site, so tks a bunch for helping! Even though our papers were marked wrong on ...
Thursday, September 27, 2012 at 8:02pm

phycology
Depends on how you define young, middle. Abstract reasoning seldom occurs before age 7, and even then, just in a few. My own experience is that one sees the change between 8th grade and 10th grade, and by the 11th grade teaching physics is possible. Piaget developed his ideas ...
Thursday, September 27, 2012 at 6:11pm

math
divide 1st (multiply by inverse) (1/3 * 7/5) + (5/14 * 7/5) 7/15 + 1/2 = 14/30 + 15/30
Wednesday, September 26, 2012 at 8:32pm

Calculus-math
using slope-intercept, the given slope is -1/2 the slope of the tangent to the function is the 1st derivative f(x) = 1 / sqrt(x) = x^(-1/2) f'(x) = (-1/2) x^(-3/2) substitute to find x and then y at the point of tangency use point-slope to write the equation of the new ...
Wednesday, September 26, 2012 at 2:20pm

math
number: xxxxxxxx divisible by 10: xxxxxxx0 one digit is 80,000: xxx8xxx0 millions is largest: x9x8xxx0 1000s - millions-3: x9x86xx0 100s = half of 1000s: x9x863x0 tens = ones+2: x9x86320 factor of 25: x9586320 1st digit even: 49586320
Wednesday, September 26, 2012 at 10:39am

Maths - Arithmetic Progression
T4 = a+3d = 8 S10 = 5(2a+9d) = 40 a = 16 d = -8/3 T1 = 16 T10 = 16 + 9(-8/3) = -8 check, sequence is 16 40/3 32/3 8 16/3 8/3 0 -8/3 -16/3 -8 ... Sum of 1st 10 terms = 40
Tuesday, September 25, 2012 at 11:35am

Chemistry
%recovery 1st = (12.5/18.5)*100 = ? %recovery total = [(12.5+2.7)/18.5)]*100 = ?
Thursday, September 20, 2012 at 8:16pm

math,social studies and heaalth
I am in middle school and I want to know what my grade point average is. Do you know any websites where I can calculate my grade point average. Thanks.
Wednesday, September 19, 2012 at 3:53pm

Physics
Bragg’s Law nλ =2dsinθ, n=2dsinθ/λ. Max n when sinθ=1 => n=2d/λ=2•0.1013/0.179 = 1.13. Since n has to be integer, n=1 => the maxima of the 1st order on the both sides of the central max
Wednesday, September 19, 2012 at 2:08pm

Yes I am not smarter than a 6th grader. How do I show the math and in the simplest form for the following: A sixth grade class has 100 sheets of lightweight paper. They use 3/4 of the paper for a collection of class poems. What is the total thickness of the paper they use?
Monday, September 17, 2012 at 7:27pm

Calculus -- OOPS!
I mixed up x and y in the 1st one! x^2+y^2 = 12y x^2 - 12y + y^2 = 0 x^2 + (y-6)^2 = 36 Also, the 2nd one could just as well have been written r = 14cosθ. It would just draw the circle from the left, rather than from the right.
Monday, September 17, 2012 at 4:09pm

physics
A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25m/s at the bottom of the grade, what is the distance traveled by the car before it comes to rest?
Sunday, September 16, 2012 at 5:06pm

I did my calculations wrong and now Im going to get a bad, bad, bad grade on my lab report I need to know what how to find the highth and width and radius of several things are help me plz!!!!
Saturday, September 15, 2012 at 5:33pm

math
a(1-r^4)/(1-r) = 15/32 a/(1-r) = 1/3 divide the 1st by the 2nd 1-r^4 = 45/32 r^4 = 1-45/32 = -13/32 no real solution for r, since we can't take an even root of a negative check your typing.
Saturday, September 15, 2012 at 10:26am

Math (Algebra 2)
So the slope between any segment must be the same slope for first two points: (0-1)/(4-2) = -1/2 slope between 1st and last point: (k^2 - 1)/(-4-2) = (k^2 - 1)/-6 so (k^2 -1)/-4 = -1/2 2k^2 - 2 = 4 2k^2 = 6 k^2 = 3 k = ± √3
Friday, September 14, 2012 at 12:11am

college algebra
add the last two: 4x + 6y = -4 from the 1st: y = -2-2x sub into above new equation: 4x + 6(-2-2x) = -4 4x - 12 - 12x = -4 -8x = 8 x = -1 then y = -2+2 = 0 in the 2nd: x+y-z=-4 -1+0-z=-4 -z=-3 z=3 x=-1 y=0 z=3
Thursday, September 13, 2012 at 7:43pm

math
the "roundness of an integer greater than 1 is the sum of the exponenys of the prime number. for example, 20= 2to the squared multiplied by 5 to the 1st power,so 20 has a roundness of 3. what is the roundness of 1,000,000?
Wednesday, September 12, 2012 at 6:16pm

Maths
I am sure you mean f(x) = (x^2 - 4)/(x^2 - 1) make a table of values, picking any value x you want, except x =±2 or x =±1 plot the points, until you see the outline of the curve or you could use this webpage http://rechneronline.de/function-graphs/​ enter (...
Wednesday, September 12, 2012 at 1:07pm

math
randall opened a savings account on June 1st and made the following deposits: \$212.19, June 5th \$23.03, June 12 \$307.15, June 19th \$652.00 and June 30, \$78.75. Assuming he made no withdrawals, approximately how much did he have in the savings account at the end of the month of...
Tuesday, September 11, 2012 at 8:28pm

STATISTICS
"a grade less than 58 and greater thAN 110 " No student will receive this grade! Seriously, you probably mean "a grade less than 58 or greater thAN 110 " What can be done is to calculate the percentage of students who receive X, where 58≤X≤110. Given...
Monday, September 10, 2012 at 8:36am

how do u do standed form? for 3rd grade home work math
Wednesday, September 5, 2012 at 6:24pm

Math
A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help
Wednesday, September 5, 2012 at 10:59am

Physics
Use the equations: S=vi*t + (1/2)gt^2 For 1st ball: 20=0+(1/2)gt^2 => t=sqrt(40/g) For 2nd ball: 20 = vi*(t-1) + (1/2)g(t-1)^2 vi = [20-(1/2)g(t-1)^2]/(t-1) =(20-(9.81/2)*(t-1)^2)/(t-1) =14.62 m/s downwards
Friday, August 31, 2012 at 8:04pm

physics
1st 3 hours: (0,0) to (-46.0,86.5) next 1.5 hours it moves an additional (0,45.0) so, it winds up at (-46.0,131.5) d = √(46^2 + 131.5^2) = 139.3
Friday, August 31, 2012 at 4:35pm

Algebra..
what's the problem? In each coordinate pair, the 1st number is in the domain, the 2nd in the range. example: 2c: f*g = (1,-4), (3,-12) since 2 and 4 are not in the domain of g, and 5 is not in the domain of f, f*g is not defined there. 2e: gofoh = g(f(h) h(1) = 0 but g(0) ...
Friday, August 31, 2012 at 4:23pm

Isabella is hoping to get an A on her college algebra course. With just the final exam left to take, she currently has an average of 92 on her exercises. The quizzes count for 40%, exercises count for30% of the class grade. What is the minimal grade that Isabella must have on ...
Thursday, August 30, 2012 at 2:11pm

Isabella is hoping to get an A on her college Algebra course. With just the finaL exam left to take, she currently has an average of 85 on her quizzes and average of 92 on her exercises. The quizzes count for 40%, exercises count for 30% of the class grade. What is the minimal...
Thursday, August 30, 2012 at 11:07am

Algebra2
domain: {-1,2} range: {2,4,6} domain is the x-coordinate (1st value) range is the y-coordinate (2nd value) f(x) is certainly not x^2 + 2 (-1)^2 + 2 = 3, not 4 (2,6) fits, but (2,2) does not. In fact, since (2,2) and (2,6) contain the same x-value, but different y-values, these...
Wednesday, August 29, 2012 at 5:25pm

algebra
Tony went to the racetrack with \$80. He won \$15 on the 1st race, lost \$12 on the 2nd, lost \$6 on the 3rd and won \$8 on the 4th. How much money did he have after the 4th race.
Tuesday, August 28, 2012 at 6:58am

CAMERON IS IN 8TH ASUNTE IS IN 5TH THIS PROBLEM IS 8TH GRADE MATH.YES I NEED TO EXPRESS IT INTO MATH TERMS. TY
Thursday, August 23, 2012 at 8:55pm

Asunte/Cameron -- are you in 5th or 8th grade? How would you express this in math terms?
Thursday, August 23, 2012 at 8:50pm

math
Eq1: X = 5y + 3. Eq2: X = 5y - 3. Substitute 2 for Y in each Eq and solve for X: Eq1: X = 5*2 + 3 = 10 + 3 = 13. Eq2: X = 5*2 - 3 = 10 - 3 = 7. The value of the 1st term in each Eq is 10. In Eq1, we add 3 to 10. But in Eq2, we subtract 3 from 10. Therefore, the solutions ...
Thursday, August 23, 2012 at 7:50pm

Okay Ms. Sue. I am in 8th grade but I am taking Algebra with 9th graders. I am very confused with my previous problem. I have asked my Dad but we are both getting confused. Now I have come up with 22. Is this my correct answer?
Wednesday, August 22, 2012 at 9:59pm

geography
which country is the biggest (mongolia,china,southkorea,north korea,japan? p.s. i am 8 yaers old and going to 4th grade so use 4th grade words so thank you but no thanks to the geeks. sincerely, cesia xoxo
Tuesday, August 21, 2012 at 11:06am

AlgebraII
time for 1st trip = x/40, where x is the distance between NY and Boston time for return trip = x/60 total time = x/40 + x/60 = (60x + 40x)/2400 = 100x/2400 = x/24 so average rate = 2x/(x/24) =2x ( 24/x) = 48
Monday, August 20, 2012 at 8:27pm

Math
1 + 3 + 5 +........2n-1.... 1st term = 1 40th term = 2*40-1 = 79 arith metic progression s = n/2(a1+an) = 40/2(1+79) = 1600
Sunday, August 19, 2012 at 1:05pm

writing
You're in 8th grade. You can certainly at least try to answer those questions. Is 8th grade going to be too hard for you? Maybe you should rethink your dreams of going to college for 8 years or so.
Wednesday, August 15, 2012 at 5:49pm

math
My son is in Kindergarten and I have no idea about the "Counters" in the question: 1st) Cover the teddy bears in the top row with different-color teddy bear counters. 2nd) Color the teddy bears in the bottom row to show the colors." Help. Thanks You.
Tuesday, August 14, 2012 at 8:37pm

CTU
Part IV: You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9% interest that ...
Monday, August 13, 2012 at 6:52pm

Physics
Upon a flat only 10 m high (Is that possible?) there are two guns A and B attached together making a vertical angle of 60 degrees when A is flat on roof. They fire at the same time and has the same reloading time. Both guns are capable of giving an initial velocity of 5√...
Friday, August 10, 2012 at 4:56am

biology
Trophic Level Cylinder Volume of H2O Volume of Oil Total Volume % Oil 1st 1000 ml 1000 ml 2nd 100 ml 100 ml 3rd 10 ml 10 ml
Thursday, August 9, 2012 at 9:37am

Dynamics
The time of the first ball motion to the top point is v=v(o1) –gt, v=0, t=v(o1) /g=18/9.8 = 1.84 s. The maximum height of the 1st ball is H= v(o1) •t –gt²/2=16.53 m. When the 2nd ball starts, the 1st ball is on its return trip during 2-1.84 =0.16 s. It ...
Monday, July 30, 2012 at 8:53am

Reimbursement Methodologies Final Exam
Can anyone please help me with Part A with the 1st question: You're the new director of a hospital health information management department. The chief financial officer has hired you for your experties in health care reimbursement and needs to know how your department can ...
Friday, July 20, 2012 at 4:57pm

math
1st 10 Ft = \$100. 2nd 10 Ft = \$125. 3rd 10 Ft = \$150. 4th 10 Ft = \$175. 5th 10 Ft = \$200. 6th 10 Ft = \$225. 7th 10 Ft = \$250. 8th 10 Ft = \$275. 9th 10 Ft = \$300. TOT. = \$1800.
Tuesday, July 10, 2012 at 8:03pm

math
The first obvious comparison to me is that homework counts about 10% of the total points. Each of the four tests also count about 10%. Add those to the final, and the professor is counting over 50% of the grade on exams. Another quarter of the grade is the lab.
Thursday, July 5, 2012 at 8:47pm

math
not sure if this had to do with math but my professor gave us this last hw assignment that i don't understand at all. It has to do with the grade scaling he does. 4x Exams = 37450 HW = 9362 Final = 16385 Lab = 23407 Recitation = 7022 Total Points = 93626 He asks whats the ...
Thursday, July 5, 2012 at 8:35pm

payroll
An employee's rate of pay is \$40.00 per hour, with time and a half for all hours worked in excess of 40 during a week. The following data are available: Allowances claimed on W-4 4 Allowance amount allowed:\$70 ea. Hours worked this week 50 Y T D Earnings prior 105,200 F I ...
Sunday, July 1, 2012 at 8:27pm

College algebra
Let X be distance per hour, Ist trip=18miles =18/X 2nd trip=23miles =23/X,=1hr longer speed,S=2nd trip-1st trip X=23-18 X=5mph. checkings 23/5 -18/5 =4.6-3.6=1hr
Friday, June 22, 2012 at 8:51pm

Foreign languages
Writeacher, can you please check these sentences? Thank you. 1 Talk about the place where you live using the following grid: . – What is your town like – How long have you lived there – if you like it or not and why – If you don’t like it where you ...
Thursday, June 21, 2012 at 5:38pm

Art
Who is the artist of the Ngady Mwaash Mask (search on yah oo, then click images, it should be the 4th one) and the artist of the Sowo Mask, (same thing, go to yah oo search the name then click images, and it should be the 1st one)
Sunday, June 17, 2012 at 2:15pm

Physics
Let the x-axis point toward the center of curvature and the y-axis point upward. Use Newton’s second law ΣFy = N• cos θ = mg, ΣFx = N• sin θ = m•v²/R, Dividing the 2nd equation by the 1st equation, we obtain tan θ = v² /R...
Saturday, June 16, 2012 at 6:48am

1st. -168 + 8 = -168 + 1*8. 2nd. -168 + 16 = -168 + 2*8. 3rd. -168 + 24 = -168 + 3*8. 4th. -168 + 32 = -168 + 4*8 88th. ---------= -168 + 88*8 = 536.
Sunday, June 10, 2012 at 11:47am

medu
Exact simple interest means we count the number of days in the year (some say it is 365, leap year or not) to do the calculation of simple interest. Ordinary simple interest is based on the banker's year of 12 months of 30 days, or 360 days a year. This is equivalent to a ...
Friday, June 8, 2012 at 6:16pm

I CANNOT BELIEVE THIS IS A THIRD GRADE WORKSHEET! THIS IS SOO INAPPROPRIATE. THEY HAVE NEVER DONE LONG DIVISION OR REMAINDERS & THERE IS ONE WEEK OF SCHOOL LEFT & THIS IS WHAT THE TEACHER HANDS OUT.....86 DIVIDED BY 9, 17 DIVIDED BY 3, 73 DIVIDED BY 8 ! HOW MANY FLUID OUNCES ...
Tuesday, May 29, 2012 at 11:42pm

math
mike has an average of 89 on the five tests he has taken so far this semester. what grade must mike earn on the next test to raise his average grade exactly to 90?
Tuesday, May 29, 2012 at 5:38pm

math
let the number of cars be x 1st trip: number of people = 3x + 7 return trip: number of people = 4x + 2 4x + 2 = 3x + 7 x = 5 So there were 5 cars the number of people was 3(5) + 7 = 22
Monday, May 21, 2012 at 8:39pm

algebra 2 homework check
The 1st round consist of 64 teams and 32 games. After each round, the number of teams and the number of games is re- duced by a factor of 2: Round Team Games. 1. 64 32. 2. 32 16. 3. 16 8. 4. 8 4. 5. 4 2. 6. 2 1. Total = 61 Games.
Sunday, May 20, 2012 at 8:13pm

Calculus
A Baseball Diamond has the shape of a square with sides 90 feet long. a player is running from 1st to 2nd base at a speed of 25 feet per second. find the rate at which his distance s is from home plate is changing when the player is 20 feet from 2nd base.
Sunday, May 20, 2012 at 1:42pm

algebra1
double the first, then add to the 2nd----> 9x - 4y = 13 (#4) triple the first, subtract from 3rd ---> -2x -9y = 7 (#5) #4 times 2 --> 18x - 8y = 26 #5 times 9 --> -18x -81y = 63 add them -89y = 89 y = -1 sub into #4 9x + 4 = 13 9x = 9 x = 1 sub into 1st 1 + 1 + z...
Thursday, May 17, 2012 at 6:40pm

financial understanding
if apr is 7.3% daily and haad \$400 1st 10 days, 1500 next 10 and 600 next 10 how much intrest was earned at end of month
Thursday, May 17, 2012 at 1:28pm

chemistry
Just do them one at a time. H3PO4 ==> H^+ + H2PO4^- H2PO4^- ==> H^+ + HPO4^2- HPO4^- ==> H^+ + PO4^3- K is ALWAYS (products)/(reactants) and ate coefficients become exponents. k3 = (H^+)(PO4^3-)/(HPO4^-) The coefficients are 1 so everything is raised to the 1st power.
Saturday, May 12, 2012 at 10:30pm

Math
first three terms of a geometric sequence are the same as the 1st, 9th and 11th terms of an arithmetic sequence, respectively. What is the common ratio in the geometric sequence ? Thanks!
Saturday, May 12, 2012 at 9:41pm

math
x^3 - 5x^2 + 2x ≥ -8 x^3 - 5x^2 + 2x + 8 >= 0 consider the equality: (x+1)(x-2)(x-4) = 0 Knowing the general shape of cubics, you can surmise that the inequality is satisfied between the first two roots, and beyond the third. So, -1 <= x < 2 or x >= 4...
Thursday, May 10, 2012 at 6:49pm

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