Saturday

November 28, 2015
Total # Posts: 3,409

**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?
*March 8, 2012*

**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?
*March 8, 2012*

**math**

THINK ITS addition of an odd number like 1+3=4 2+5=7 3+7=10 4+9=13
*March 8, 2012*

**math**

PROBABLY 3,000,000 / 5
*March 8, 2012*

**AP CHEMISTRY**

ITS a college class in high school. Im takin it in grade 12
*March 8, 2012*

**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 ...
*March 8, 2012*

**physical science**

assuming that there are no other nonconservative forces involved what was given to each car during the collision
*March 7, 2012*

**physical science**

what was the kinetic energy of each car before breaking
*March 7, 2012*

**algebra**

x^+6x+9 using the diamond and generic rectangle
*March 6, 2012*

**Chemistry**

probably right
*March 6, 2012*

**math 208**

you equation is supposed to be -8n -8 = 4 -8n=12 n=-1.5
*March 6, 2012*

**math 208**

the top answer i gave is wrng i think
*March 6, 2012*

**math 208**

aint it: -4-2n+2=4 -2n-2=4 -2n=6 n=-3
*March 6, 2012*

**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 ...
*March 5, 2012*

**Jiskha**

wow helpin people just for free NICEEE
*March 3, 2012*

**Jiskha**

THAnX 4 tellin me!!
*March 3, 2012*

**Jiskha**

U guys answr evry question??????
*March 3, 2012*

**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
*March 3, 2012*

**spanish**

Nosotros les (vender) el auto a unos chicos venezolanos. preterite form of the verb supplied
*March 2, 2012*

**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?
*March 1, 2012*

**spanish**

THANX!
*February 29, 2012*

**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
*February 29, 2012*

**physics**

63 m
*February 29, 2012*

**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 ?
*February 28, 2012*

**Alg**

I THINK ITS 30/25 = x/45 x=54 burgers
*February 28, 2012*

**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?
*February 26, 2012*

**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.
*February 23, 2012*

**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
*February 23, 2012*

**Math**

Probably (x+3)(x-4)
*February 23, 2012*

**GeOmEtRy!!!**

:)
*February 23, 2012*

**GeOmEtRy!!!**

I THINK ITS 3x^2 = 75 x^2 = 25 x=+5 or x=-5
*February 23, 2012*

**math**

I THINK ITS Each number in the sequence is 9 less than the previous number.
*February 22, 2012*

**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?
*February 22, 2012*

**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?
*February 22, 2012*

**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
*February 21, 2012*

**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.)
*February 21, 2012*

**Math**

2m+6=2m-1 bring 2m to the other side 0+6=-1 I THINK THE ANSWER IS UNDEFINED because 6cannot=-1
*February 18, 2012*

**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.
*February 17, 2012*

**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.
*February 16, 2012*

**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
*February 16, 2012*

**Math**

I THINK IT'S THIS: 200=5x-100-2x 200=3x-100 -2=3x -2/3=x
*February 16, 2012*

**geometry**

set it up like x/65 = 160/130 solve for x probably u shuld get 80
*February 16, 2012*

**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
*February 15, 2012*

**Math**

probably 3/5
*February 15, 2012*

**math**

u to
*February 15, 2012*

**math**

ohhh okay
*February 15, 2012*

**math**

i just answered it
*February 15, 2012*

**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
*February 15, 2012*

**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
*February 15, 2012*

**math**

use long division for 7/8 and you probably shuld get .875 and then multiply it by 39 and get 34.125
*February 15, 2012*

**math**

probably: 506/27 OR in decimals 18.7407
*February 15, 2012*

**math**

is it (32/3)*(51/9)
*February 15, 2012*

**Math**

welcome
*February 15, 2012*

**Math**

so i think its x=0 then solver y 2(0)-3y=6 y=-2
*February 15, 2012*

**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
*February 15, 2012*

**math**

welcome
*February 15, 2012*

**math**

its sometimes true
*February 15, 2012*

**Spanish**

!____!
*February 15, 2012*

**Spanish**

I think its: You buy your for your mother?
*February 15, 2012*

**Math**

multiply 12 by both sides
*February 15, 2012*

**Math**

probably 33.6
*February 15, 2012*

**math:logarithms**

put it in your calculator and see if it works
*February 15, 2012*

**Mathe**

is it(4m/9)+(13-1m/3)=4 ?????
*February 15, 2012*

**Math, geometry**

perimeter of a rectangle = 2width + 2length 30= 2w+2(4) 30= 2w+8 22= 2w w= 11 millimeters
*February 15, 2012*

**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
*February 15, 2012*

**AP CHEMISTRY**

why pKa2??
*February 15, 2012*

**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 ...
*February 15, 2012*

**math: elapsed time**

Do u want to calculate elapse time?
*February 15, 2012*

**math: elapsed time**

go on gooogle and type in elapsed time in math. And check: Math:Elapsed Time-eThemes
*February 15, 2012*

**Maths**

are u serious? anyway 5cm*10mm/1cm Ans=50mm
*February 15, 2012*

**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
*February 15, 2012*

**Algebra 1**

Are u sure its direct variation or is that an incomplete question?
*February 15, 2012*

**physics**

A. From F=ma i'd say it would be the hummer as its got greater mass, and as Force is constant
*February 15, 2012*

**chemistry**

how many moles of oxygen are required for the combustion of 25.5 g of magnesium
*February 14, 2012*

**Math**

Help please
*February 13, 2012*

**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.
*February 13, 2012*

**chemistry**

oh no i messed up ! i wrote the wrong elements -_-'' im sorry.And thanks for the website!
*February 13, 2012*

**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 ---&...
*February 13, 2012*

**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.
*February 13, 2012*

**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 ...
*February 13, 2012*

**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.
*February 12, 2012*

**Math**

4/5-2p/5=6/5 Please help me solve this and show how you did it. Thanks
*February 11, 2012*

**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...
*February 9, 2012*

**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?
*February 6, 2012*

**Chemistry**

Calculate the mass of a quart (946 mL) of mercury. The density of mercury us 13.6 g/mL?
*February 6, 2012*

**10th grade Math --Shadow-Pull questions**

AC=12 Db=32 AD=x
*February 5, 2012*

**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
*February 2, 2012*

**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. ...
*February 1, 2012*

**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.
*February 1, 2012*

**Sammons**

how to find the product of 38 and 75?
*February 1, 2012*

**College Algebra**

WHAT WOULD THE SCORE BE AFTER 4 MONTHS
*February 1, 2012*

**intro law enforcement**

date 9-22-08 fire in a lawyers office main st, ridgefield ct art work was smashed chairs, papers, and curtains started a fire ( match started it) building is empty over night .5 miles from downtown district 1st fire in a chain from arsonist left a law book on the porch what ...
*January 30, 2012*

**chemistry**

The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new energy?
*January 30, 2012*

**chemistry**

yeah sorry hehe thanks!
*January 29, 2012*

**chemistry**

so it would be 0.96 ?is that right? (8x-393.5)+9(-241.8)+x=5113.3 -5324.2+x=5113.3 x=0.96
*January 29, 2012*

**chemistry**

For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this isomer of C8H18(g)?
*January 29, 2012*

**Center**

How is the efficiency of pushing a concrete block up a wooden ramp increased
*January 29, 2012*

**Science **

Job Issues related to overdrawing surface water?
*January 28, 2012*