Thursday

September 3, 2015
Total # Posts: 781

**math/science**

describe the symmetries of a water molecule.
*April 13, 2011*

**math**

let x and y be real numbers. find the area enclosed by the graph of the following equation: abs(2x)+abs(2y)=1
*April 13, 2011*

**help(math)**

Signs in a department store read, "75% off original prices when you take an extra extra 50% off already reduced prices." By what percent were original prices reduced before today's sale?
*April 13, 2011*

**Math**

lisa checks the stats for her favorite puzzle game on her Ipod. she sees that she has won exactly 72% of the 2400 puzzles that she has played. what is the minimum numbers of puzzles that lisa must win before she has won at least 73% of the total number of puzzels played. i ...
*April 13, 2011*

**chemistry**

Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3?
*April 8, 2011*

**math**

Katie is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?
*April 7, 2011*

**Chemistry **

I have 5.0 ml of lead II NITRATE and mix it with 20.0 ml of Sodium Iodide. what is the formula of the precipitate
*March 20, 2011*

**calculus**

A 20 ft ladder is leaning against the side of a house. If the bottom of the ladder is moving away from the house at the rate of 2 feet per second, how fast is the top of the ladder moving down the wall when the bottom of the ladder is 12 feet from the house
*March 16, 2011*

**math**

Find all the two digit prime numbers neither of whose digits are prime. Someone helped me yesterday but I do not understand.
*March 15, 2011*

**Math**

Find the smallest possible sum of six consecutive integers such that none of the integers is prime.
*March 14, 2011*

**Math**

is 48 included in the numbers you listed?
*March 14, 2011*

**Math**

okay, thank you
*March 14, 2011*

**Math**

Find all the two digit prime numbers neither of whose digits are prime.
*March 14, 2011*

**physics : different question **

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest. 2000 kg car going 5m/s 500 kg car going 20 m/s 1000 kg car going20m/s 500 kg car going10m/s 1000 kg car going10/s 4000 kg car going 5m/s
*March 8, 2011*

**physics**

Rank these automobiles based on the magnitude of the impulse needed to stop them, from largest to smallest. 2000 kg car going 5m/s 500 kg car going 20 m/s 1000 kg car going20m/s 500 kg car going10m/s 1000 kg car going10/s 4000 kg car going 5m/s
*March 8, 2011*

**10th geade Chem**

Does anyone know how much heat do I need to convert 95g. of ice at -25 C. to water at 30 C. the heat capacity of H2O(s) is 2.1 J/g*C.
*February 28, 2011*

**Chem**

How much heat do I need to convert 200g of liquid water at -25C to water at 30C?. The specific heat capacity of H2O(s) is 2.1 J g*C
*February 28, 2011*

**child care managment**

An apprpriate science activity for a child 6 to 12 years of age is: A. collecting leaves. B.using a compass to find specific sites. C.growing plants froom seeds. D. experimenting with magnet.
*February 28, 2011*

**english**

clutced her notebook in the other hand as though it were a flyswatter is this a similie?
*February 26, 2011*

**english**

clutced her notebook in the other hand as though it were a flyswatter
*February 26, 2011*

**Child Care Mangment**

For me, B and C, Im not sure,these concepts stimulating children's sense of wonder and motivate them to explore the surrounding world. Thats why I'm asking That's why I'm asking for help
*February 24, 2011*

**Child Care Mangment**

An apprpriate science activity for a child 6 to 12 years of age is: A. collecting leaves. B.using a compass to find specific sites. C.growing plants froom seeds. D. experimenting with magnet. Thanks
*February 24, 2011*

**Math**

Penelope bought 17 large packs and 5 small packs of identical pens. When she got home, her little sister opened all of the packages on the floor. If a total of 234 pens were on the floor, how man pens did a large pack contain?
*February 18, 2011*

**Math**

circles P and Q are externally tangent at T. Horizontal lines l and m are, respectively, tangent to circles P and Q at R and S. Show that RT must contain S.
*February 18, 2011*

**math**

f(2n)=n+f(2n-2) and f(2)=1. determine f(20)
*February 18, 2011*

**math**

Use each of the integers 1-9 exactly once in any order to write a numerical expression equal to 2011. An integer may be written as an exponent, and the operations of addition, subtraction, multiplication, and divisions as well as grouping symbols may be used.
*February 18, 2011*

**Math**

What is the probability that rolling four fair, six-sided dice produces an even sum?
*February 15, 2011*

**SPANISH**

no i meant it as rhino. the word that we use for nose.
*February 15, 2011*

**SPANISH**

if i said, un animal grande que es la palabra en ingles para nariz, would you know what animal I was talking about.
*February 15, 2011*

**Physics**

A car travels in a straight line for 5.4 h at a constant speed of 79 km/h . What is its acceleration? Answer in units of m/s2.
*February 14, 2011*

**physics**

Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hang in static equilibrium, with an ...
*February 9, 2011*

**physics**

three spheres, each with a negative charge of 4.0*10^-6 C, are fixed at the vertices of an equilateral triangle whose sides are 0.20m long. Calculate the magnitude and direction of the net force on each sphere. So far i have drawn a diagram and used the formula Fe= kq1q2/r^2 ...
*February 9, 2011*

**physics**

79515.55
*February 3, 2011*

**math**

1 time only :)
*February 2, 2011*

**child care**

1.B 2.D 3.D 4.C 5.C 6.C 7.A 8.A 9.C 10.A 11.B 12.A 13.B 14.C ,NOT SURE B, OR B. 15.A 16.D 17.C 18.A 19.B. 20.C.
*February 1, 2011*

**3rd grade math hw help!**

I AM AN EQUIDRATERAL TRIANGLE.ONE SIDE IS 3 INCHES LONG.HOW LONG ARE MY OTHER 2 SIDES
*January 31, 2011*

**math**

the x value is negative and the y value is positive
*January 31, 2011*

**math**

A boat starts at point A, moves 3 km due north, then 2 km due east, then 1 km due south, and then 4 km due east to point B. Find the distance AB.
*January 31, 2011*

**math**

A jar contains some red and some yellow jelly beans. If a child ate 1 red jelly bean, 1/7 of the remaining candies would be red. If instead the child ate 5 yellow jelly beans, 1/6 of the remaining candies would be red
*January 28, 2011*

**MATH**

two sides of a triangle measure 8 and 15. how many integer values can be assigned to the third side so that all the angles in the triangle are acute.
*January 28, 2011*

**math(HELP)**

A jar contains some red and some yellow jelly beans. If a child ate 1 red jelly bean, 1/7 of the remaining candies would be red. If instead the child ate 5 yellow jelly beans, 1/6 of the remaining candies would be red.
*January 28, 2011*

**math(HELP)**

Show that number N! can terminate in exactly 1,2,3,4,or 6 zeros but never 5 zeros?
*January 28, 2011*

**MATH!!!!**

Im new, and I just noticed that....Thanks
*January 28, 2011*

**MATH!!!!**

already*
*January 28, 2011*

**MATH!!!!**

yes that helps. sorry i feel dumb when I ask questions alerdady on here. =/
*January 28, 2011*

**MATH!!!!**

A triangle with side lengths 26, 28, and 30 is constructed so that the longest and shortest sides are tangent to a circle. the third side passes through the center of the circle. compute the radius of the circle. I DONT KNOW HOW TO DO THIS AT ALL....
*January 28, 2011*

**MATH**

A dartboard has the numbers 3, 6, 9, 12, 15, 19, 21, 25, 27, and 30 on it. What is the fewest number of darts that could be thrown if two darts tcannot land on the same number and if the sum of the scores must be 50?
*January 27, 2011*

**Algebra**

The discriminant is b^2-4ac I won't do all the work for you, but figure that number out. -If its positive, theres two solutions -If its negative there are no solutions -If its zero theres one solution.
*January 27, 2011*

**Organic Chem **

The result is a peptide bond.
*January 27, 2011*

**math**

Sally can paint 1/4 of a house per hour. John can paint 1/6 of a house per hour. Let's say the answer is t hours for the total job. Then (1/4)t + (1/6)t = 1 (1/4 + 1/6)t = 1 (6/24 + 4/24)t = 1 (10/24)t = 1 t = 24/10 hours = 2.4 hours
*January 26, 2011*

**Math**

In a variant of the game Nim, two players alternate taking turns in removing 1, 2, or 3, beans from a pile. The object is to remove the last bean. If the initial pile has 29 beans, should you want to go first or second to guarantee a win?
*January 26, 2011*

**Espanol III**

su español es perfecto!!!!!
*January 26, 2011*

**geomatry**

m (DOC) = 3/4m(BOA)
*January 21, 2011*

**calculus**

On the graph of f(x)=7sin(7pi x), points P and Q are at consecutive lowest and highest points with P occuring before Q. Find the slope of the line which passes through P and Q.
*January 15, 2011*

**Physics**

a 10 kg gun recoils with a speed of 0.1 meter per second as it fires a 0.001kg bullet. what is the speed of the bullet as it leaves the gun
*January 13, 2011*

**chemistry**

If you have 25 liters of carbon dioxide at STP, how many grams of it do you have?
*January 11, 2011*

**algebra**

I don't know because I'm trying to figure it out now. Can someone please help me???????
*January 8, 2011*

**Chemistry**

Compounds can be classified as acids or bases according to _____ different theories.
*January 8, 2011*

**Chemistry**

A .35M solution of a newly synthesized acid, HX, has [H+] of 4.1 x 10^-2. What is the value of Ka for this acid?
*January 8, 2011*

**math**

If p = 2 and q = 8, the value of p^3 + 64 squared ÷ q is _____. All i can say is huh????
*January 5, 2011*

**math**

The names and ages for each person in a family of five follow: Name Dick Jane Kirk Jean Scott Age 40 36 8 6 2 a. What is the mean age? b. Find the mean of the ages 5 yr from now. c. Find the mean 10 yr from now. d. Describe the relationships among the means found in (a), (b), ...
*January 5, 2011*

**math**

Assuming the probability is that a child is a boy and births are independent. What is the probability that if a family will have four children (no twins), they will all be boys?
*January 4, 2011*

**math**

Suppose that a ball is drawn at random from the box (a), its color is recorded, and then the ball is put back in the box. Draw a tree diagram for this experiment and find the probability that the two balls are of different colors.
*January 4, 2011*

**English**

Identify the word in bold type. This car was fixed by the woman WHOSE parents used to live in New York. demonstrative pronoun indefinite pronoun interrogative pronoun relative pronoun not a pronoun
*January 4, 2011*

**Physic**

If the coefficient of static friction for tires on a road is 0.25, at what maximum speed can a car round a level 47.5 m radius curve without slipping?
*January 3, 2011*

**physics**

Im working on this same question too and i cant figure out how you got the .5 when doing 3.6*.866/.5 ??? because i know the answer is correct, is it because the net force goes through the middle?
*January 1, 2011*

**math**

A box contains three white balls and two red balls. A ball is drawn at random from the box and not replaced. Then a second ball is drawn from the box. Draw a tree diagram for this experiment and find the probability that the two balls are of different colors.
*December 27, 2010*

**math**

If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.
*December 20, 2010*

**english**

how does it meets the promise of the opening of the Declaration's second paragraph, and how it does not.
*December 16, 2010*

**5th grade math**

Using the butterfly method, which fraction is less 1/4 or 1/3 - I know the answer but using the butterfly method the answer does not work out? Am I doing something improper? Thanks!
*November 30, 2010*

**us history**

Some help with this questions would be great....thanks everyone. I would like to say the answer is #1. As president, John Quincy Adams supported... 1.a national bank to promote a uniform currency and to control credit. 2.a strict limit on the powers of the federal government. ...
*November 29, 2010*

**LIT/210**

Thank you very much for the additional information I am certain that this will be useful. Thanks again!
*November 18, 2010*

**LIT/210**

What are some additional methods that I could use during my lit course to write about the literature I will be reading? I need four, but I only could think of two. These are the two I have so far. 1)I have thought about using a reading journal to write down my thoughts and ...
*November 18, 2010*

**Math**

Opps, sorry.. I forgot to write that Maria also has a project worth 4% which she got perfect on
*November 18, 2010*

**Math**

There are four tests in a year. The first test is worth 26%, the second is worth 20%, the third test is worth 30%, and the fourth test is 20%. Maria received a 59% on her first test. To recieve a final mark of 65%, what is the minimum she needs to obtain on each test? Can ...
*November 18, 2010*

**Algebra 2**

Which one is a rule for the nth term of an arithmetic sequence with a8 = 56 and d = 5?
*November 18, 2010*

**Chemistry**

A current of 0.80 A was applied to an electrolytic cell containing molten CdCl2 for 2.5 hours. Calculate the mass (in grams) of cadmium metal deposited. [Enter only numbers in the blank.]
*November 15, 2010*

**Chemistry**

Calculate the cell emf (in volts) for the following reaction at 25°C: Ni(s) + 2 Cu2+(0.010 M) → Ni2+(0.0010 M) + 2 Cu+(1.0 M) [Enter only the number of your answer.] Answer
*November 15, 2010*

**Chemistry**

How many hours will it take to produce 78.0 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.00 Amperes? [Enter only a number for your answer.]
*November 15, 2010*

**Chemistry**

Consider an electrochemical cell based on the following cell diagram: Pt | Pu3+(aq), Pu4+(aq) || Cl2(g), Cl−(aq) | Pt Given that the standard cell emf is 0.35 V and that the standard reduction potential of chlorine is 1.36 V, what is the standard reduction potential E&...
*November 15, 2010*

**Math**

Six girls each invited a date to the Sadie Hawkins dance. Before they joined in the fun, each couple worked in a different booth. The booths were Popcorn Sales, Marriage, Hayrides, Old Time Photos, Lemonade, and Raffle Tickets. Grab your partner and go round and round with ...
*November 7, 2010*

**statistics in psych**

mouradian (2001) surveyed college students selected from a screening session to include tow groups a) perps b) comparisons...
*November 6, 2010*

**history**

what three things did roosevelt say the country had to do to turn the economy around?
*November 5, 2010*

**science**

an air sample contains 0.046% CO2 if the total pressure is 760mmHg what is the partial pressure of CO2
*November 4, 2010*

**Physics**

A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 9.8 m/s. Also, it has an acceleration in the direction parallel to the walls of 3.7 m/s2.At what angle with the wall will the particle strike...
*October 31, 2010*

**Math**

lisa cut a log into 4 pieces in 6 minutes. she then cut a smaller log into 8 pieces. how long should the job have taken if she worked at the same rate she had worked when cutting the first log? show all work and prove your answer.
*October 31, 2010*

**Algebra.**

9a-1+8c-8a+c
*October 25, 2010*

**chemistry**

HOw many calories of heat were produced by the reaction of 10ml water with the powder of two compartments (2x3.23 g) of the heater?
*October 25, 2010*

**Physics**

An object with mass m1 = 6.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...
*October 20, 2010*

**Physics**

Two blocks each of mass m = 4.10 kg are fastened to the top of an elevator as in the figure below. (a) If the elevator accelerates upward at 1.6 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 ? N T2 ? N (b) If the strings can withstand a maximum tension ...
*October 20, 2010*

**Physics**

A 520 N cat burglar is supported by cables in the figure below. Assume the angle θ of the inclined cable is 32.0°. Find the tension in each cable. (Inclined, vertical, and horizontal)
*October 20, 2010*

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
*October 20, 2010*

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*October 20, 2010*

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...
*October 19, 2010*

**Physics**

A block with a mass 4.0 kg is held in equilibrium on an incline of angle θ = 42° by a horizontal force F. a)Find the magnitude of the normal force. b) Find the magnitude of F. (Ignore friction.)
*October 19, 2010*

**Physics**

using this formula i got 8.42, which is not the right answer
*October 19, 2010*

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*October 19, 2010*

**Physics**

A 10 kg box is pulled across the floor at a constant velocity of 3.0m/s. If the box is pulled with a force of 40 N, what's the size of the frictional force between the box and the floor?
*October 18, 2010*

**physics**

A car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105 m/s every ...
*October 18, 2010*

**physics**

A 7000 kg helicopter accelerates upward at 0.70 m/s/s while lifting a 1000 kg car to a mountaintop for a TV commercial photo shoot. -What tension must the cable be able to withstand without breaking?
*October 18, 2010*