Wednesday
October 22, 2014

Posts by John


Total # Posts: 6,303

physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
October 23, 2012

Boolean algebra
Simplify this function using Boolean algebra laws? I am stuck on this part of my homework (x2'x1'x0') + (x2'x1x0) + (x2x1x0') I know you have to use distributive laws to do this. Any help is appreciated. Thank you.
October 23, 2012

ict
I need help woth my cross word
October 23, 2012

Physics
The wheel is attached to an electric generator and the rotation rate drops from 290 to 230 in 3.5 . What is the average power output?
October 23, 2012

Physics
Find the energy stored in the solid flywheel of mass 8.0×104 and radius 1.8 when it's rotating at 290
October 23, 2012

Math
Monday, Mr. C stacked a display case of 80 heads of lettuce. By end of day, some were sold. Tuesday Mr. C counted lettuce left and decided to add an equal number of lettuce (**hint - he doubled the leftovers).  At end of Tuesday, he sold the same number as ...
October 22, 2012

chemistry
oh alright thank you i found out my mistake. thank you sir.
October 22, 2012

chemistry
Will a fluoride concentration of 1.0 mg/L be soluble in a water containing 200 mg/L of calcium? I got Qsp 1.38 * 10^-8 and Ksp = 3.45*10^-11 does that seem right? and does this mean fluride concentration will be soluble in water containing calcium?
October 22, 2012

chemistry
thank you sir.
October 21, 2012

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

English
...
October 11, 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 diff erent 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

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