Sunday

March 29, 2015

March 29, 2015

Total # Posts: 734

**Chemistry**

55g of CF2Cl2, how many grams of Cl do I have? How do I solve this kind of problem?
*March 12, 2011*

**Physics**

The coil used to measure the movements of a blowfly as described having a diameter of 2 mm, in addition the blowfly is immersed in a magnetic field of magnitude .15 mT. Find the maximum magnetic flux of one of the coils?
*March 10, 2011*

**Statistics**

Recently, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain, many consumers refused to visit ...
*March 9, 2011*

**prealgebra**

In the equation A=ur^2, if r is doubled, by what number is A multiplied and why? a. 2 b. 1\2 c. 4 d. 1\4
*March 9, 2011*

**PreAlgebra**

If x=yz, which of the following must be equal to xy? a. yz b. yz^2 c. y^2z d. z^2\y
*March 9, 2011*

**MATH**

probability approx number of times event occurs\total number of trials. 3 shots divided by 10 free throws = .3 is the probability of making next free throw.
*March 9, 2011*

**physics**

a glider of length 10.00 cm slides down an air track. It passes through the lower photogate in .50 sec. A little later it passes through the lower photogate 100.00 cm down the track, in .25 sec. Calculate initial velocity,final velocity, and acceleration. Any help is greatly ...
*March 9, 2011*

**chemistry**

What mass of sodium iodide (NaI) is contained in 135 mL of a 7.0% (m/v) soulution?
*March 7, 2011*

**science**

You add 12.5 mL of 4.15 acetic acid to 25.0 mL of 1.00 M NaOH. Calculate the hydronium ion concentration and pH of the resulting solution.
*March 7, 2011*

**Algebra II**

you may want another opinion but since your answer must be not equal to zero and also cannot be negative you have to look at the (x-7) portion. you cannot just say all real numbers are greater than zero, because if you plug 7 into the problem, then (7-7) = 0 and will make the ...
*March 7, 2011*

**Algebra/geometry **

a rectangle has a width of 4 cm less than it's length. if a new rectangle is formed by increasing the width 5 cm and decreasing the length 3 cm, the area of this resulting rectangle is 177 cm squared. what are the dimensions of the original rectangle?
*March 6, 2011*

**MATH**

first you need to find 85% of 40 questions. turn 85% into the decimal .85... you do that by dividing 85 by 100. the formula is x=.85(40) and that gives you x=34. so now you know that Wendy had 34 out of 40 questions right, so now to find out how many she had wrong you subtract...
*March 6, 2011*

**Algebra 1**

First you have to recognize the terms you can combine, in this case a negative 4T and a negative 3T, which gives you a negative 7T. so now your problem looks like 6T^2 - 7T + 2. to factor it out you have to do a kind of reverse foil, see what term multiplied by what other term...
*March 6, 2011*

**Physics Concepts**

A father racing his son has one-third the kinetic energy of the son, who has two-fifths the mass of the father. The father speeds up by 1.5 m/s and then has the same kinetic energy as the son. What is the Father's initial speed? What is the Son's initial speed?
*March 5, 2011*

**math**

how much force does 1000lbs have when drop from 36"
*March 5, 2011*

**math**

A rectangular painting has an area of 720 square inches. It is to be reduced by 1/6 scale factor. What is area of the miniature copy.
*March 4, 2011*

**physics**

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate? Top weight is 12 kg and bottom is 5kg.
*March 3, 2011*

**physics**

sorry no the one on top is 12 and the hanging one is 5 in kg's
*March 3, 2011*

**physics**

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate?
*March 3, 2011*

**calc**

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].
*February 28, 2011*

**Math**

How do you find the turning point of a quadratic equation? (The Formula)
*February 27, 2011*

**math**

make a let statement letx=white ribbons letx-3= blue ribbons letx+2=red ribbons x+x+2+x-3=32 solve
*February 27, 2011*

**HE AGE OF JEFFERSON TO THE AMERICAN EXPANSION**

During Jefferson's presidency, cities were A. mostly found along the Mississippi. B. mainly industrial centers. C. mainly ports for international trade. D. mostly the haunts of thieves and degenerates.
*February 26, 2011*

**CHEMISTRY**

How to determine the molarity of a 1.8% NaCl solution.
*February 24, 2011*

**math**

Among the royalty of the land of Pirnza are Velve, Brint, Draz, Flard, and Sorn.In no particular order, their titles are Queen, Marquis, duke baron, and duchess. Their ages are 25,30,35,40 And 45.From the clues given try to determine the age and Title of each of the five.
*February 24, 2011*

**science**

How to determine the molarity of a 1.8% NaCl solution.
*February 24, 2011*

**physics**

An Atwood machine consists of two masses (m1 = 175 grams, m2 = 485 grams) connected by a string over a frictionless pulley. The initial height above the floor is 157 cm. Both masses start from rest at point A ; point B is just as m2 hits the floor. What is the kinetic energy ...
*February 23, 2011*

**math**

A single die is rolled once. What are the odds against rolling a prime number?
*February 18, 2011*

**science**

Why are the Catskills not really mountains? a the catskills are lowlands b all mountains must be volcanic in origin c the horizontal rock structure shows no deformation d the catskills are a direct deposit of the last pleistocene glaicer
*February 16, 2011*

**college algebra**

add 1 + 9 x+7 5x
*February 14, 2011*

**physics! (69)**

0.395
*February 7, 2011*

**Chemistry**

Raising the temperature of a sample of water will typically(decrease/increase) the solubility of (all/some) dissolved gases. Is it decrease, some?
*January 29, 2011*

**lit**

i need chapter summaries of the book The Quiet American by graham greene
*January 27, 2011*

**alg.2**

-2x+-6y=0 2x+6y=5 =5
*January 19, 2011*

**Maths **

285 liters of air.
*January 19, 2011*

**Physics**

A 1200 kg elevator is attatched to a cable whose tension is 11700 n. What is the magnitude of the elevator's acceleration? What is the Motion of the elevator? could have multiple answers.
*January 19, 2011*

**Math**

how did u wrk dat ou?
*January 18, 2011*

**chemistry help**

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?
*January 18, 2011*

**chemistry help **

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?
*January 18, 2011*

**physics**

Calculate the torque about the front support of a diving board, exerted by a 70 kg person 3.0 m from that support. (Take the positive direction to be clockwise.)
*January 17, 2011*

**Com170**

Write one paragraph explaining the key differences between the four types of writing (summary, analysis, synthesis, and evaluation). What do they mean.
*January 15, 2011*

**Drug Information Sources**

get a life tracey!!!!!!!!!!! whether someone checks 1 or 2 or all, its the SAME. go find something to do other than b*****ing and complaining on here
*December 22, 2010*

**physics**

A train traveling at a constant speed rounds a curve of radius 250 m. A chandelier suspended from the ceiling swings out to an angle of 15.5° throughout the turn. What is the speed of the train? what equation should i use?
*December 21, 2010*

**pre calc**

simplify: 2^x X 2^y +2^x X 2^y + 2^x X 2^y + 2^x X 2^y
*December 21, 2010*

**math**

i need to know how to solve this shark's teeth are shaped like triangles . the height of a tooth of a certain shark is 2cm longer than the base . the area is 12cm2 find the height and base.
*December 14, 2010*

**Math**

If $8,500 is invested at 6% compounded continuously, how long will it take to double the investment? How long will it take the original investment to grow to $14,586.06
*December 10, 2010*

**Math**

If $8,500 is invested at 6% compounded continuously, how long will it take to double the investment?
*December 10, 2010*

**Physics**

What is the amount of CO2 added to the earth's atmosphere each year from fossil fuels?
*December 9, 2010*

**11th grade**

A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If µk between the box and the floor is 0.75, how long does it take to move the box 7 m, starting from rest? (If the box will not move...
*December 5, 2010*

**physics**

A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If µk between the box and the floor is 0.57, how long does it take to move the box 9 m, starting from rest? (If the box will not move...
*December 5, 2010*

**MATH**

Misty uses 3/4 of a bag of noodles when she makes a cartain casserole. What is the greatest number of casseroles she can make from 6 1/4 bags of noodles?
*November 30, 2010*

**MATH**

Tina and her sister evenly split a $10 lottery winning. If tina promised to giver her brother 1/4 of her share what fraction of the original $10 did she give her brother?
*November 30, 2010*

**Math**

Tina and her sister evenly split a $10 lottery winning. If tina promised to give her brother 1/4 Of her share, what fraction of the original $10 did she give her brother?
*November 30, 2010*

**Math**

Laura takes a random survey of the students in her school. Of the 48 students asked, 16 plans to go to the football game. There are 231 students in her shcool. What proportion can she use to find s the total number of students expected to attend the game?
*November 30, 2010*

**Math**

Bob wants to buy cards with $20. Each card cost between $1.80 and $2.25. What is the maximum number of cards he can buy?
*November 30, 2010*

**Math**

Which statement is true about all prisms? A. Prisms have a pair of opposite faces B. The faces of a prism are congruent C. Prims have the same number of verticrs as edges D. The base of a prism is larger then the other faces.
*November 22, 2010*

**Math**

Meka plans to bake a large circular cookies for her brothers. She wants to decorate the outer edge of the cookie small pieces of choclate. The radius of the cookies is 7 inches.What would be the closest to the curcumference of the cookie?
*November 22, 2010*

**Math**

Meka plans to bake a large circular cookies for her brothers. She wants to decorate the outer edge of the cookie small pieces of choclate. The radius of the cookies is 7 inches.What would be the closest to the curcumference of the cookie?
*November 22, 2010*

**Math**

The width of a single cour is 3/4 of the width of the double court. Double court which is the base= 36 feet and the height= 78 feet What is the area of the singles court?
*November 22, 2010*

**statistics**

The average time to sew a pair of pants is 4.2 hours with a standard deviation of 30 minutes and if the distribution is normal then the probability of a worker finishing the pants in less than 3 hours is.
*November 16, 2010*

**physics**

an object is released from rest on a planet that has no atmosphere.the object falls freely for 3.46 m in the first second.what is the magnitude of the acceleration due to the gravity on the planet?
*November 7, 2010*

**spelling**

what is the correct abc order for sister's sisters sisters'
*November 4, 2010*

**accounting**

Jan.1 Beginning Inventory..300 units @ $3.00 Mar.5 Purchase..........… 900 units @ $4.00 Sept.3 Purchase...........… 1,000 units @ $5.00 Nov. 4 Purchase....… 500 units @ $7.00 During 2011, 1,000 units are sold at $10.00 each. Assume that the Periodic Invetory ...
*November 3, 2010*

**Calc**

At noon, ship A is 100 Kilometers due east of ship B, Ship A is sailing west at 12 k/h, and ship B is sailing S10degrees west at 10k/h. At what time will the ships be nearest each other and what time will the distance be? (not a right triangle)? I believe I should start with ...
*October 31, 2010*

**Calc**

At noon, ship A is 100 Kilometers due east of ship B, Ship A is sailing west at 12 k/h, and ship B is sailing S10degrees west at 10k/h. At what time will the ships be nearest each other and what time will the distance be? (not a right triangle)? Not a right triangle? You know...
*October 31, 2010*

**Calc**

Still trying to figure this out. Am i going in the right direction? c2=(12t)^2+(10t)^2-2(12t)(10t)Cos100
*October 31, 2010*

**Calc**

c^2=100^2-x+(-12t)^2-2(100-x)(-12t) Cos100 or maybe this?
*October 31, 2010*

**Calc**

Ok. So c^2=100^2+b^2-2(100)b Cos100 ?
*October 31, 2010*

**Calc**

At noon, ship A is 100 Kilometers due east of ship B, Ship A is sailing west at 12 k/h, and ship B is sailing S10degrees west at 10k/h. At what time will the ships be nearest each other and what time will the distance be? (not a right triangle)?
*October 31, 2010*

**Chemistry**

How many grams of HCl are produced according to the following equation, H2 + Cl2 = 2 HCl, when 4.0 g of hydrogen reacts completely?
*October 25, 2010*

**8th grade**

mr. macho ate 125 hotdogs over a five day peroid each day he ate seven more hotdogs than the previous day. how many hot dogs did he eat on the first day.
*October 24, 2010*

**physics**

Thank you drwls!
*October 23, 2010*

**physics**

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
*October 23, 2010*

**physics**

Me don't know
*October 15, 2010*

**Economics**

Which government bodies influence national fiscal policies that potentially affect the housing market?
*October 15, 2010*

**physics**

The mass ratio is 3.
*October 5, 2010*

**3rd grade**

Explain how 8 ten thousand can be equal to 80,000.
*October 5, 2010*

**calculus**

-ln(6x+1) + e^24x-1
*September 30, 2010*

**second grade**

it is 1,235,1469,2587,265,874 times 1million
*September 30, 2010*

**physics**

please HELP!!! What is the magnitude of the momentum of a baseball (m = 1.450 kg) traveling at a speed of 102 mi/h? Express your answer in SI units. I am unsure where to start
*September 26, 2010*

**physics**

A simple pendulum is made by attaching a small cup of sand with a hole in the bottom of a 1.2 m long string. The pendulum is mounted on the back of a small motorized car. As the car drives forward, the pendulum swings from side to side and leaves a trail of sand (15 cm from ...
*September 24, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.60 m/s2. How long does it take for this car to go from a speed of 20 mi/h to a speed of 65 mi/h?
*September 21, 2010*

**physics**

HELP PLEASE!!! A satellite moves in a circular orbit around Earth at a speed of 5085 m/s. (a) Determine the satellite's altitude above the surface of Earth. (b) Determine the period of the satellite's orbit.
*September 21, 2010*

**Physics**

A chain composed of four identical links is suspended by a rope and does not move. What are the forces on each chain? (include where they come from)
*September 21, 2010*

**biology**

are the antipodals hapliod or diploid?
*September 19, 2010*

**Math**

value of $25000.00 compounded semi annually at 7% for 5 years
*September 18, 2010*

**Calc 1**

y=108x-243
*September 17, 2010*

**Calc 1**

Find the equation of the tangent to the graph y=f'(x) at x=3 where f(x)=x^4 So I did : f'(x)=4x^3 y-81=4x^3(x-3) y=4x^4-12x+81 ?? Am i even remotely correct?
*September 17, 2010*

**Calculus 1**

According to Ohm's law, the voltage V, current I, and resistance R in a circuit are related by the equation V=IR, where the units are volts, amperes, and ohms. Assume that voltage is constant with V=12V. Calculate: The ROC of I with respect to R for the interval from R=8 ...
*September 16, 2010*

**math**

(x)/(x-8)= (x-7)/(x+3) how do u solve this for x?
*September 15, 2010*

**Honors Chemistry**

Due to the screening effect, the 3s electrons of magnesium (Mg) feel an effective nuclear charge (Zeff) of: 1. +1 2. +2 3. −2 4. +12 5. +4
*September 15, 2010*

**physics**

PLEASE HELP !!!!!!Find the acceleration reached by each of the two objects shown in figure below if the coefficient of kinetic friction between the 7.00 kg object and the plane is 0.250. img411.imageshack.us/img411/5841/p449.gif I keep getting 3.9=a
*September 13, 2010*

**physics**

You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 199 kg, and you need to exert a force of 343 N to make it just begin to move. (a) What is the coefficient of static friction between the floor and the refrigerator? F=(mu)m*g 343\...
*September 9, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.60 m/s2. How long does it take for this car to go from a speed of 20 mi/h to a speed of 65 mi/h?
*September 8, 2010*

**calculus**

Oh, right . I forgot all about the -1. Thanks.
*September 7, 2010*

**calculus**

The sum from 0 to infinity of (-1)^n(3/3^n) is convergent or divergent? If convergent, what is the sum? I got that it's convergent and the sum is 9/2, but that's wrong.
*September 7, 2010*

**algebra**

Are the following true or false? 1. The difference of two natural numbers is always a natural number. 2. The sum of two natural numbers is always a natural number. 3. The quotient of two natural numbers is always a natural number. 4. The difference of two natural numbers is ...
*September 7, 2010*

**calculus**

Determine whether the sum from n=1 to infinity of arctan(2n^2/(25n+1)) converges or diverges. If it converges, what is the sum?
*September 7, 2010*

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