Saturday

May 30, 2015

May 30, 2015

Total # Posts: 6,708

**chemistry**

Will a fluoride concentration of 1.0 mg/L be soluble in a water containing 200 mg/L of calcium? This is what i found for ksp CaF2<--> Ca(2+) +2F(-) Ksp=(x)(4x^2) where x=solubility Therefore, Ksp=3.7 x 10^-11 and for Qsp I am not sure how to go on about calculating that.
*October 21, 2012*

**Physics**

A 45-kg skater rounds a 5.0-m radius turn at 6.3 m/s. (A.) What are the vertical and horizontal components of the force the ice exerts on her skate blades? (B.) At what angle can she lean without falling over?
*October 21, 2012*

**Cemistry**

This is what i found for ksp CaF2<--> Ca(2+) +2F(-) Ksp=(x)(4x^2) where x=solubility Therefore, Ksp=3.7 x 10^-11 and for Qsp I am not sure how to go on about calculating that.
*October 21, 2012*

**Cemistry**

Will a fluoride concentration of 1.0 mg/L be soluble in a water containing 200 mg/L of calcium?
*October 21, 2012*

**Algebra 2**

x = 0 and x = 3 you did it right.
*October 21, 2012*

**math**

christi rides her bicycle 7 blocks south. 3 blocks east, 5 blocks north, and 8 blocks west. how many blocks has she ridden when she crosses her own path
*October 20, 2012*

**math**

You worked from 2:30pm – 8:45pm with a ½ hour lunch break. Your hourly wage is $7.50/ hour. How much did you earn?
*October 18, 2012*

**chemistry**

a.) The simultaneous oxidation and reduction of a chlorite ion 3ClO-2(aq)-><-2ClO-3(aq) + Cl-(aq. b.) IO-3(aq) + 6OH-(aq) + Cl(aq)-><-IO-5,6(aq) + 3H2O(i).
*October 18, 2012*

**chemistry**

write equilibrium constant expression for each reaction. a) The oxidation of ammonia with CIF3 in a rocket motor NH3(g) + CIF(g)-><-3HF(g) + 1/2N2 + 1/2Cl(g) b.) The simultaneous oxidation and reduction of a chlorite ion. 3Cl-2(aq)-><-2ClO-3(aq) + Cl-(aq) c.) IO-3(...
*October 18, 2012*

**Math**

Suppose you draw 5 cards out of a deck of 52 and get 2 spades and 3 hearts. What is the probability that the first card drawn was a spade?
*October 17, 2012*

**physics**

a baseball is thrown horizontally at a velocity of 35 m/s from a height of 1.5 m. How long does it take to hit the ground? how far does it travel?
*October 17, 2012*

**Math**

simple. Set up two fractions like so: 159mi/5.3gal =x/1gal answer would be 30 miles.
*October 17, 2012*

**chemistry .chemistry**

obtanin a piece of comcentrated acetic acid and 10 ml of di- water . bring the content of this beaker to a gentle boil using a low flame on the Bunsen burner . boild for about 3minutes , alow to cool and then remove the steel wool ball . what is formula? Ans : Fe + 2CH3COOH...
*October 17, 2012*

**chemistry**

obtanin a piece of comcentrated acetic acid and 10 ml of di- water . bring the content of this beaker to a gentle boil using a low flame on the Bunsen burner . boild for about 3minutes , alow to cool and then remove the steel wool ball . what's happened in procedure? i ...
*October 16, 2012*

**chemistry**

thank you
*October 16, 2012*

**chemistry**

From which sublevel are the first 2 electrons for Fe removed from ______ From which sublevel is the next electron for Fe removed from _________ Why does the removal of electrons stop at this subleval and number of electron?? Please help me !!!
*October 16, 2012*

**chemistry --**

What determines whether 2 or 3 electrons will be removed from Fe when it reacts with another chemical or element?
*October 16, 2012*

**math**

The value of a new car decreases exponentially.Suppose your mother buys a new car for 22,000. The value of the car decreases by 20% each year. a.what is the initial price of the car. The decay factor. b. write an equation to model the value of the cars years after she buys it...
*October 14, 2012*

**chemistry**

compare the emission color of lithium to that of potassium .what can you conclude about these two elements and the energy levels that their electron transition?
*October 12, 2012*

**chemistry**

How do you convert that to kJ/mol
*October 10, 2012*

**Repost-Physics 1**

A crate of mass 48 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 11 m as measured along the ramp. Assume the crate moves at constant velocity. _____J
*October 9, 2012*

**Repost-Physics 1**

Two railroad cars, each of mass 2.2 104 kg, are connected by a cable to each other, and the car in front is connected by a cable to the engine as shown in the figure below. The cars start from rest and accelerate to a speed of 1.7 m/s after 1 min. a)Find the work done by cable...
*October 9, 2012*

**Repost-Physics 1**

A car is pushed along a long road that is straight, horizontal, and parallel to the x direction. a)The horizontal force on the car varies with x as shown in the figure. What is the work done on the car by this force? (Let a = 100 N.) _____J b)What is the work done by gravity ...
*October 9, 2012*

**Repost-Physics 1**

A horizontal force of 30 N pulls a block of mass 2.5 kg across a level floor. The coefficient of kinetic friction between the block and the floor is ìK = 0.25. If the block begins with a speed of 2.0 m/s and is pulled for a distance of 18 m, what is the final speed of ...
*October 9, 2012*

**Repost-Physics 1**

A skier of mass 109 kg travels down a frictionless ski trail. a)If the top of the trail is a height 218 m above the bottom, what is the work done by gravity on the skier? _____J b)Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts from...
*October 9, 2012*

**Repost-Physics 1**

Consider a roller coaster that moves along the track shown in the figure below. Assume all friction is negligible and ignore the kinetic energy of the roller coaster's wheels. Assume the roller coaster starts with a speed of 19 m/s at point A. Find the speed of the roller ...
*October 9, 2012*

**physics**

A 110 kg object moves in a horizontal straight line with an initial speed of 54 m/s. If it is stopped along that line with a deceleration of 1.90 m/s2 what magnitude of force is required?
*October 9, 2012*

**physics**

A 110 kg object moves in a horizontal straight line with an initial speed of 54 m/s. If it is stopped along that line with a deceleration of 1.90 m/s2 what magnitude of force is required?
*October 9, 2012*

**Physics**

assuming there is no air friction, A) yes B) (10+1.35)-8.65= 2.7m
*October 9, 2012*

**Math**

10/2 X - 3/2 X= 7/2 X= 3.5X
*October 9, 2012*

**4th grade math**

no problem
*October 9, 2012*

**4th grade math**

72
*October 9, 2012*

**Physics 1**

Consider a roller coaster that moves along the track shown in the figure below. Assume all friction is negligible and ignore the kinetic energy of the roller coaster's wheels. Assume the roller coaster starts with a speed of 19 m/s at point A. Find the speed of the roller ...
*October 8, 2012*

**Physics 1**

A skier of mass 109 kg travels down a frictionless ski trail. a)If the top of the trail is a height 218 m above the bottom, what is the work done by gravity on the skier? _____J b)Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts from...
*October 8, 2012*

**Physics 1**

A horizontal force of 30 N pulls a block of mass 2.5 kg across a level floor. The coefficient of kinetic friction between the block and the floor is μK = 0.25. If the block begins with a speed of 2.0 m/s and is pulled for a distance of 18 m, what is the final speed of the...
*October 8, 2012*

**Physics 1**

A car is pushed along a long road that is straight, horizontal, and parallel to the x direction. a)The horizontal force on the car varies with x as shown in the figure. What is the work done on the car by this force? (Let a = 100 N.) _____J b)What is the work done by gravity ...
*October 8, 2012*

**Physics 1**

Two railroad cars, each of mass 2.2 104 kg, are connected by a cable to each other, and the car in front is connected by a cable to the engine as shown in the figure below. The cars start from rest and accelerate to a speed of 1.7 m/s after 1 min. a)Find the work done by cable...
*October 8, 2012*

**Physics 1**

A crate of mass 48 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 11 m as measured along the ramp. Assume the crate moves at constant velocity. _____J
*October 8, 2012*

**Physics 1**

A crate of mass 42 kg is pushed across a level floor by a person. If the person exerts a force of 20 N in the horizontal direction and moves the crate a distance of 11 m, what is the work done by the person? _____J
*October 8, 2012*

**english**

I'm trying to help someone with homework. And I need too know a paragraph including does words, so i can understand it and help them.
*October 8, 2012*

**english**

Can you give me a short story in narrative form using these words:renounced, swaggering, raucous, insolently, simultaneously, incredulously, cynically, maneuvered, deprived, haggard, institution, reformation.
*October 8, 2012*

**Math**

Insert a set of parentheses in this expression so that ii is equivalent to 3y+10: 4y-3x-y+2x-8+5x+2
*October 7, 2012*

**algebra 2**

i'm trying to solve this system of equations with 3 variables 5a-b+3c=5 2a+7b-2c=5 4a-5b-7c=-65 i tried to make the first equation like a=something so i could substitute it in to the 2nd equation, however i get decimals so it doesnt work how do i do this problem?
*October 7, 2012*

**Chemistry**

What is the moles of NaOH when molarity is .2744 125 mL flask Mass 9.398 Volume 29.90
*October 6, 2012*

**Alg 2**

Today we learned how to solve systems of equations with 3 variables, however my teacher didn't go over how to do a problem where not every single equation in the system has the 3 variables. Can someone point me to a place that explains this? the kind of problem im talking ...
*October 5, 2012*

**math**

351
*October 5, 2012*

**algebra**

Simplify the expression. 22+ (32 – 42)
*October 4, 2012*

**precalculus**

81.125
*October 4, 2012*

**Physics 1**

T^2/R^3=4pi^2/GM ---->T^2/5.8e11=4pi^2/(6.673e-11)(1.99e30) is this how it's supposed to be setup?
*October 4, 2012*

**Physics 1 **

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 5.8 1011 m. Find the period of the orbit. _____s
*October 4, 2012*

**Physics 1**

I'm sorry but I don't understand what these masses should be..I keep finding different ones...
*October 4, 2012*

**Physics 1**

Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
*October 4, 2012*

**Physics 1**

The hard disk in a laptop computer contains a small disk that rotates at a rate of 5000 rpm. If this disk has a radius of 2.3 cm, what is the centripetal acceleration of a point at the edge of the disk?_____m/s^2
*October 4, 2012*

**Physics 1**

Thank you I used that formula and it's perfect..I appreciate the help Steve...
*October 4, 2012*

**Physics 1**

F=6.673x10^-11(16)(27)/1.4^2 is this correct?
*October 4, 2012*

**Physics 1 **

This is a repost....:Two small particles of mass 16 kg and 27 kg are a distance 1.4 m apart. What is the gravitational force of one of these particles on the other?_____N
*October 4, 2012*

**Trigonometry**

How do you solve the equation 5√3 secθ = 10 in degree measure? please explain.
*October 4, 2012*

**Trigonometry**

What is the period of the function f(x) = -5sin(θ/3) ?
*October 4, 2012*

**Trigonometry**

So what is the period of the function?
*October 4, 2012*

**Trigonometry **

How do you solve for f(x) = -5sin(θ/3) ?
*October 4, 2012*

**Trigonometry**

thank you steve!!
*October 4, 2012*

**Trigonometry **

√3 + 5cos⦸ = 3 cos⦸ Can someone please explain for me how to express the answer in radian measure? Thanks
*October 4, 2012*

**Physics 1**

The hard disk in a laptop computer contains a small disk that rotates at a rate of 5000 rpm. If this disk has a radius of 2.3 cm, what is the centripetal acceleration of a point at the edge of the disk?_____m/s^2
*October 3, 2012*

**Physics 1**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 5.8 1011 m. Find the period of the orbit. _____s
*October 3, 2012*

**Physics 1**

Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
*October 3, 2012*

**Physics 1**

Two small particles of mass 16 kg and 27 kg are a distance 1.4 m apart. What is the gravitational force of one of these particles on the other?_____N
*October 3, 2012*

**Contrast Sentence**

thank you, Ms. Sue
*October 3, 2012*

**Contrast Sentence**

Which sentence below shows a contrast? A) The Northeast has warm summers and cold, snowy winters. B) Unlike the Northeast, the Southeast has hot, humid summers and mild winters. C) The Southeast gets a great deal of rainfall, causing much humidity during the summer. D) The ...
*October 3, 2012*

**Earth Science**

How energy flows through the Earth's system?
*October 1, 2012*

**Math**

Thank you!
*October 1, 2012*

**Math**

You're friend tells you about a new online music site called ComboAl- bum that lets you choose any 10 songs from their song library for 9:99. ComboAlbum's advertising says their song catalogue is so large there are over 10; 000; 000 different song combinations ...
*October 1, 2012*

**introduction to ethics**

power
*October 1, 2012*

**math**

the perimeter of an athletic field is 104 meters and the length is 12 meters more than the width find the width and the length.
*October 1, 2012*

**math**

the perimeter of an athletic field is 104 meters and the length is 12 meters more than the width find the width and the length.
*October 1, 2012*

**math**

the perimeter of an athletic field is 104 meters and the length is 12 meters more than the width find the width and the length.
*October 1, 2012*

**Physics**

A delivery truck travels 19 blocks north, 14 blocks west and 15 blocks south. What is its final displacement from the origin? whats the degrees???
*September 30, 2012*

**Math - Imaginary**

(i)(4i)(-4i) it is 4i^2(-4i) = -16i^3 ? If it is not right, please help. thanks!
*September 30, 2012*

**Math**

$45,890
*September 30, 2012*

**Chemistry**

I'm looking for the moles, using the given amount of atoms. i was given 3.01 x 10^23 atoms of Ag the answer I got was 18.1 x 10^23 is this correct?
*September 30, 2012*

**english**

Can you give me at least a paragraph on the quote Therefore do not deceive yourself. Of all deceivers fear most yourself. Thanks
*September 29, 2012*

**english**

Therefore do not deceive yourself. Of all deceivers fear most yourself. what does this mean.
*September 29, 2012*

**Physics**

A 2kg block is released from rest at position A and falls 12 meters to the floor. At position B, just before it lands, it is falling at 15m/s. a) if the blocks potential energy is zero at B, what is its potential energy at A?
*September 28, 2012*

**physics**

Three charges are fixed to an xy coordinate system. A charge of +25C is on the y axis at y = +2.7 m. A charge of -16C is at the origin. Lastly, a charge of +66C is on the x axis at x = +2.7 m. Determine (a) the magnitude and (b) direction of the net electrostatic force on the ...
*September 28, 2012*

**physics**

Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 10-6 kg. The gravitational force ...
*September 28, 2012*

**statistics/calculus**

e^(10)-e^(10-x)-x/(e^(10)-11)=0.25 and e^(10)-e^(10-x)-x/(e^(10)-11)=0.75 -Solve both for x. -Can you solve both of these for x without a Ti-89 calculator? If so how? -The reason I want to calculate this is to find upper and lower quartiles of a deformity angle which is ...
*September 27, 2012*

**Chemistry**

How to solve titration problem for HC2H3O2 + NaOH= NaC2H3O2 + H2O The M of NaOH= 0.427 The volume of NaOH= 17.30mL 10.00mL of acid The second titration calculation is: The M of NaOH= 0.427 The volume of NaOH=34.60mL 20.00mL of acid
*September 27, 2012*

**French**

Yes, Les is to plular as le is to singular
*September 27, 2012*

**Chemistry**

Convert 3.01 x 10^23 atoms of silicon to moles of silicon. on my paper i have the equations moles S = 3.01 x 10^23 atoms x 1 mole/6.022x10^23 atoms but i'm not sure how to do this. help?
*September 26, 2012*

**Chemistry**

The question says calculate the mass or volume required to make the following solution. 20mL of a 3% hydrogen peroxide solution from a 30% H2O2 solution.
*September 26, 2012*

**Chemistry**

How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?
*September 26, 2012*

**physics**

A 36 kg child steps on a scale in an elevator that starts at rest. The elevator then accelerates downward at 0.6 meters per second squared for 1.9 seconds. What is the reading on the scale (in kg)?
*September 26, 2012*

**math**

what is the ratio 8 to 48 in fraction form
*September 25, 2012*

**physics**

never mind, i got it.
*September 25, 2012*

**physics**

A coin is placed 26 cm from the center of a horizontal turntable, initially at rest. The turntable then begins to rotate. When the speed of the coin is 120 cm/s (rotating at a constant rate), the coin just begins to slip. The acceleration of gravity is 980 cm/s 2. What is the ...
*September 25, 2012*

**Chemistry**

That sounds right to me..thanks for all of your help.
*September 24, 2012*

**Chemistry**

Well the questions are confusing, the first question asks to find the mass of sulfate in my 1 gram sample of alum based off of the mass of BaSO4 (0.52g). The second question then asks to calculate the percent sulfate in my alum, and I don't know if that means my sample of ...
*September 24, 2012*

**Chemistry**

Why is my actual percent of sulfate in alum a lot less than my theoretical percent of sulfate in alum? Actual Percent SO4= 1.68% Theoretical Percent SO4= 40.5%
*September 24, 2012*

**biology12 HELP ASAP TEST TOM**

For each given word start with the wor and put the rest in order appropriately> RIBOSOME----> golgi complex, vesicale food to be digested, rough er, lysosome put in order MITOCHONDRIAN---> muscles use energy, energy made , carboydrate and oxygen sunlight---> ...
*September 24, 2012*

**CHEMISTY!!!!!!!!**

If 15.0g of KCL is added to 100.0g of water at 30.0 C, how much more must be added to saturate the solution
*September 23, 2012*