Thursday
April 17, 2014

Posts by MIKE


Total # Posts: 3,111

physics
A 4.00-m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.500 m and mass 1.00 kg. The spool is mounted on a frictionless axle and is initially at rest. The cord is pulled from the spool with a constant acceleration of magnitude 2.86 m/s2. (a) ...

statistics
The mean life of a set of batteries in a T83 calculator is 525 with a standard deviation of 35 hours assume normal distribution is normal whats is the probability that set will last for more the 540 hrs

Chemistry
Calculate the pH after 0.011 mol NaOH is added to 1.00 L of each of the four solutions. a) 0.100 M propanoic acid (HC3H5O2, Ka= 1.3 10-5) b) 0.100 M sodium propanoate (NaC3H5O2) c)pure H2O d) 0.100 M HC3H5O2 and 0.100 M NaC3H5O2

Safety
Please help me to unscramble these 40 letters into 2 sentences that has 12 words. A A A A E E E E E E E I I I I O O U U C D F J K L L L N N N P P R S T T T T T Y . The puzzle includes some letters as follows:(use blanks from above) _ _ / _ _ f _ _ _ /_ s / _ / _ _ _ _ , / _ h ...

algebra
5x + 5 = .2x + 29. I know x is 5 but what are the steps to get there?

Algebra
9 inches.

algebra
The Environmental Protection Agency (EPA) monitors air quality in U.S. cities. The function f gives the annual number of days with unhealthy air quality in Los Angeles, California, for selected years. X: 1995 1997 1999 2000 2003 f(x):113 60 56 87 88 (a) Find F(1995)and interpr...

HELP! College Physics
check the related questions. The one with the 6.8m/s

math
check the related questions below

chemistry
How do I write these compounds in their "true form" or Ionic State? NaCl, CuSO4, NH4OH How do i find the charges?

physics
At a playground, a 19.8 kg child plays on a slide that drops through a height of 2.13 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -319 J on the child. What is the child's speed at the bottom of the slide?

physics
At a playground, a 19.8 kg child plays on a slide that drops through a height of 2.13 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -319 J on the child. What is the child's speed at the bottom of the slide?

math
THINK ITS addition of an odd number like 1+3=4 2+5=7 3+7=10 4+9=13

math
PROBABLY 3,000,000 / 5

AP CHEMISTRY
ITS a college class in high school. Im takin it in grade 12

Chemistry
I THINK ITS 1) The balanced equation is NaHCO3(s) + H+(aq)= Na+(aq) + CO2(g) + H2O(aq). Remember acid + base = salt + water. 2) 2 CaO(s) + 5 C(s) = 2 CaC2(s) + CO2(g) 3)C(s)+H2O(g)=>CO(g)+H2(g 4) CuO (s) + CO (g) Cu (s) + CO2 (g) I THINK THEY ARE RIGHT. CHECK WITH SOMEONE E...

physical science
assuming that there are no other nonconservative forces involved what was given to each car during the collision

physical science
what was the kinetic energy of each car before breaking

algebra
x^+6x+9 using the diamond and generic rectangle

Chemistry
probably right

math 208
you equation is supposed to be -8n -8 = 4 -8n=12 n=-1.5

math 208
the top answer i gave is wrng i think

math 208
aint it: -4-2n+2=4 -2n-2=4 -2n=6 n=-3

algebra
grandma ploan to finance her grandchilds college education she has 50,000 to invest use a long range investment pln ,cd,saving bond etc. the plan is to earn compound interest.the principal is(p)50,000 interest rate is (r)3.60years for investment is(6)this is time state number ...

Jiskha
wow helpin people just for free NICEEE

Jiskha
THAnX 4 tellin me!!

Jiskha
U guys answr evry question??????

Chemisty
THINK IT"S Molar mass C2H5OH = 46 g / mol 7.50 g / 46 = 0.163 moles the ratio between C6H12O6 and C2H5OH is 1 : 2 1 : 2 = x : 0.163 x = 0.0815 moles of C6H12O6 needed molar mass C6H12O6 = 180 g/mol 180 x 0.0815 = 14.7 g

spanish
Nosotros les (vender) el auto a unos chicos venezolanos. preterite form of the verb supplied

geometry
a sailboat has a sail which is shaped like a right triangle. The base of the triangle is 14 feet and the height is 20 feet. What is the area of the sail? The boat also has two smaller sails that are each half as large as the big one. How big is each of the two smaller sails?

spanish
THANX!

spanish
type the same qsn on gooooogle and the website is like the 2nd one the heading of the page on gooogle says: How can pierde be used? | SpanishDict Answers

statistics
A test was given out to a class of 20 students. The highest possible score to get is 30. The mean of the tests came out to 26. One student was caught cheating and got 20 points removed from their test. what is the new mean. 28,25,24,22 ?

Alg
I THINK ITS 30/25 = x/45 x=54 burgers

Aviation
What location of CG (forward or aft center of gravity) would be the most fuel efficient? The most stable? Could you change this situation if you changed the design of the aircraft?

Math
'one angle is 4 times as large as another angle of the same triangle. the third angle o the triangle has a measure of 60 degress.' what are the measures of the other two angles in the triangle.

GeOmEtRy!!!
I THINK ITS THIS : (1/2) x (2h-4) x h = 35 (h-2)h = 35 h^2-2h-35 = 0 (h-7)(h+5) = 0 Positive solution: height = 7 inches base = 2h-4 = 2*7-4 = 10 inches

Math
:)

Math
Probably (x+3)(x-4)

GeOmEtRy!!!
:)

GeOmEtRy!!!
I THINK ITS 3x^2 = 75 x^2 = 25 x=+5 or x=-5

math
I THINK ITS Each number in the sequence is 9 less than the previous number.

statistics
Varsity team try out. Assume the distribution of heights to be normal w/a mean of 64inches & standard deviation of 4 inches. only 15 students passed. how many students joined the try out?

statistics
a teacher decides to fail 25% of the class.Examination marks are roughly normally distributed w/a mean of 72 & standard deviation of 6. what mark must a student make to pass?

Calc
Write the equation of the line tangent to the graph of the function at the indicated point. As a check, graph both the function and the tangent line you found to see whether it looks correct. (1/x^3 -x)^2 at x= 2

calculus
The revenue from the sale of x units of a product is represented by the following formula. R = 10(5x + 1)–1 + 70x – 11 dollars Find the marginal revenue when 50 units are sold. (Round your answer to the nearest cent.)

Math
2m+6=2m-1 bring 2m to the other side 0+6=-1 I THINK THE ANSWER IS UNDEFINED because 6cannot=-1

Physics
At the moment t=0 a particle starts moving along thr x-axis so that its velocity projection varies as vx= 35 cos pi t cm/s, where 't' is expressed in seconds. Find the distance that this particle covers during t = 2.80 s after the start.

math
I THINK ITS THIS: If each line joins just two points, and you want a line joining every pair of points, then it takes 16 * 15 / 2 = 120 lines.

Math
multiply by 2 on both sides 6x-4=8x-18 then subtract 6x to the other side -4=8x-6x-18 then add 18 to the other side -4+18=8x-6x and then simplify and then solve for x 14=2x x=7

Math
I THINK IT'S THIS: 200=5x-100-2x 200=3x-100 -2=3x -2/3=x

geometry
set it up like x/65 = 160/130 solve for x probably u shuld get 80

Math
I think its rhombus because A rhombus is a quadrilateral having the following properties.. 1.All the sides are equal 2.Opposite sides are parallel i.e it has two pairs of parallel sides. 3.Opposite angles are equal

Math
probably 3/5

math
u to

math
ohhh okay

math
i just answered it

math
dont u have a calculator or are u not allowed to use it anyway ithink its this 38/100 simplified it to 19/50 35/100 simplified it to 7/20

math
probably 55.371 work: for mixed fraction you 6and4/5 multiply5&6 and add 4 and divide it by 5 8 and 1/7 multiply7&8 and add 1and divide it by 7 you shuld get improper fractions and then turn them to decimals and multiply both of them it wuld be much easier to use a calculator

math
use long division for 7/8 and you probably shuld get .875 and then multiply it by 39 and get 34.125

math
probably: 506/27 OR in decimals 18.7407

math
is it (32/3)*(51/9)

Math
welcome

Math
so i think its x=0 then solver y 2(0)-3y=6 y=-2

Algebra
Ithink its this Let d = number of days then cost of west trip: 450d + 1075 cost of south trip: 375d + 1500 375d + 1500 < 450d + 1075 1500 < 75d + 1075 425 < 75d 5.67 < d answer: 6 days or greater

math
welcome

math
its sometimes true

Spanish
!____!

Spanish
I think its: You buy your for your mother?

Math
multiply 12 by both sides

Math
probably 33.6

math:logarithms
put it in your calculator and see if it works

Mathe
is it(4m/9)+(13-1m/3)=4 ?????

Math, geometry
perimeter of a rectangle = 2width + 2length 30= 2w+2(4) 30= 2w+8 22= 2w w= 11 millimeters

Pre- Algebra
subtract 7n to the other side AND subtract 13 to the other side and also divide 3 to the other side,so 7n-5=10n+13 -5=10n-7n +13 -5-13=10n-7n -18=3n n=-6

AP CHEMISTRY
why pKa2??

math
In math, an array refers to a set of numbers or objects that will follow a specific pattern. An array is an orderly arrangement, often in rows, columns or a matrix. Arrays are used in multiplication and division as it shows a great visual to show how multiplication can be show...

math: elapsed time
Do u want to calculate elapse time?

math: elapsed time
go on gooogle and type in elapsed time in math. And check: Math:Elapsed Time-eThemes

Maths
are u serious? anyway 5cm*10mm/1cm Ans=50mm

help in math
1) x^2 - 6x =0 x(x-6)=0 x=o OR x=+6 check: plug these 2 numbers in the first equation (The One I Gave) and see if it equals 0. 2) x^2 -3x=0 x(x-3)=0 x=0 OR x=+3 3) try this one by yourself

Algebra 1
Are u sure its direct variation or is that an incomplete question?

physics
A. From F=ma i'd say it would be the hummer as its got greater mass, and as Force is constant

chemistry
how many moles of oxygen are required for the combustion of 25.5 g of magnesium

Math
Help please

Math
One angle of a triangle measures 120 degrees. The other two angles are congruent. Write and solve an equation to find the measure of the congruent angles.

chemistry
oh no i messed up ! i wrote the wrong elements -_-'' im sorry.And thanks for the website!

chemistry
In a particular redox reaction, Cr is oxidized to CrO4^2– and Cu2^+ is reduced to Cu^+ . Complete and balance the equation for this reaction in acidic solution. Cr + Cu^2+ ---> CrO4^2-+ Cu^+ i started off by doing this 2 x SO3^2- ---> SO4^2- + 2e 2 x Cu^2+ +2e ---&g...

Physics
A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.

Physics
You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the coefficie...

chemistry
Assume the density of aqueous HCl is the same as water (1.0 g/mL) and use the densities of ethanol (0.789 g/mL) and water as well as the actual amount of recrystallization solvent used to calculate the mass of recrystallization solvent.

Math
4/5-2p/5=6/5 Please help me solve this and show how you did it. Thanks

physics
Four charges with equal magnitudes of 6.50 x 10-15 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 4.07 cm and 5.28 cm. Find the magnitude of the electric field at the center of the rectangle, assuming that three charges have the same...

Chemistry
A sample of 50.0 mL if sulfuric acid that has a density of 1.84 g/mL would have a mass of how many grams?

Chemistry
Calculate the mass of a quart (946 mL) of mercury. The density of mercury us 13.6 g/mL?

10th grade Math --Shadow-Pull questions
AC=12 Db=32 AD=x

Math
A box contains 3 red marbles, 6 blue marbles, and 1 white marble. The marbles are selected at random, one at a time, and are not replaced. Find the probability. P(red and blue and blue) Please help me

physics
A moving particle encounters an external electric field that decreases its kinetic energy from 9530 eV to 7800 eV as the particle moves from position A to position B. The electric potential at A is -69.0 V, and that at B is +39.0 V. Determine the charge of the particle. Includ...

physics
An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.

Sammons
how to find the product of 38 and 75?

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