Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 3,112

**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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