Monday
November 24, 2014

Posts by john


Total # Posts: 6,350

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

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

Physics
The graph below represents the velocity of a ball thrown straight up by a strong pitcher as a function of time. In the first part of the graph ending at A, the ball is accelerated to 39.2 m/s in a time of 0.20 s. After the ball leaves the pitcher’s hand, it experiences ...
September 22, 2012

math
A tight-rope walker walks across a 30.0 m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is half-way across. If the tension in both halves of the wire at this point is 3675 N, what is the mass of the tight-rope walker...
September 20, 2012

Financial Investments
The number of years n required for an investment at interest rate r to double in value must satisfy (1+r)^n = 2. Using the approximation ln(1+r)=r valid for small r, find the number years n as a function of r.
September 20, 2012

statistics
Professor Gensemer is canoeing down the Colorado River, trying to reach camp by nightfall. To get that far, she must paddle successfully through 6 sections of white water rapids. For each section, if she reaches that sections there is a probability .1 of her capsizing and ...
September 19, 2012

Physics
A hiker drops a heavy stone over a cliff and hears it strike the cliff base 2.8 seconds after dropping it. If the velocity of sound is 335 m/s, how high is the cliff?
September 19, 2012

math
what is the simple interest on a $14,500 loan at 9% interest for 5 years?
September 19, 2012

math
Add the fractions 1/3, 5/6, and 3/8 and reduce your answer to lowest terms.
September 19, 2012

math
Janet took a standardized test that contained 328 questions. She answered 75% of the questions. How many questions did she answer?
September 19, 2012

Math
Add the fractions 1/3, 5/6, and 3/8 and reduce your answer to the lowest terms.
September 19, 2012

chemistry
Calculate the amount of heat required to heat a 3.7{\rm kg} gold bar from 30^\circ {\rm C} to 61^\circ {\rm C}. Specific heat capacity of gold is 0.128 \rm J/g ^\circ C
September 19, 2012

physics
A train is moving parallel and adjacent to a highway with a constant speed of 25 m/s. Initially a car is 49 meters behind the train travelling in the same directionas the train at 37 m/s and accelerating at 4 m/s^2. What is the speed of the car just as it passes the train.
September 18, 2012

physics
A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0º below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert...
September 18, 2012

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (0, infinity).
September 18, 2012

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (o, infinity).
September 18, 2012

physics
3.45
September 18, 2012

Probability and statistics
how much will the squirrel expect to have
September 18, 2012

Math
Please help I have no Idea what to do here. A box with an open top is to be constructed by cutting a-inch squares from the corners of a rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 420 in^3 when a = 3?
September 18, 2012

math
12p - 3 - 17p + 42
September 18, 2012

math/trig
A flagpole casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
September 17, 2012

math/trig
A 16 ft ladder casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
September 17, 2012

Math
Rounded to the nearest 10 I am 12750
September 17, 2012

algebra
hey i was wondering if u could tell me the right answer to this problem..ty the product of 2 and the sum of 5 and k i think its either 2(5+k) or 2x(5+k)
September 17, 2012

calculus *astroid*
Everything is so easy once you know how to work around it! Thanks again Steve.
September 17, 2012

calculus *astroid*
THe equation x^2/3 + y^2/3 = 4 describes an astroid. Determine the length of the astroid by finding the length of a portion of it,found in the first quadrant, being y = (4-x^2/3)^3/2 for 0<x<8 and multiplying that valor by 4.
September 17, 2012

calculus *improper integrals*
I see how it makes sense now, thanks a lot Steve!
September 16, 2012

calculus *improper integrals*
yes , the hole goes through the sphere, centered along the diameter
September 16, 2012

calculus *improper integrals*
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 16, 2012

college algebra
to travel 132 miles it take sue riding a moped 2 hours less time then it takes doreen to travel 56 miles riding a bike. sue travels 15 miles per hour faster then doreen find the time and rates
September 16, 2012

Chemistry
I've tried to solve this question multiple ways I just can't seem to get it. I just don't understand what I should be doing. An organic liquid is a mixture of methyl alcohol () and ethyl alcohol (). A 0.220- sample of the liquid is burned in an excess of and yields...
September 16, 2012

Chem
what is the pH of solution made by mixing 100 mL of 0.030M HCL with 200 mL water?
September 16, 2012

calculus
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 15, 2012

PHYSICS
The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?
September 13, 2012

English - Early American Lit (NEED ASAP)
Yeah I looked them up for number 2. That's why's B. Have you looked up the titles for number 2?! So... pretty much you commenting told me nothing I didn't knw already. I didn't ask for links. I asked for letters... like A,B,C,D.. it's our alphabet if you ...
September 13, 2012

English - Early American Lit (NEED ASAP)
2. B
September 13, 2012

English - Early American Lit (NEED ASAP)
My answers so far: 1.A 2.C Not sure if they are correct
September 13, 2012

math
complete the tables so that the ratios are equivalent i don't understand 10 | | 27 40 | 36 | 54 | 72
September 12, 2012

physics
An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 53800 m/s to a speed of 4.58 × 106 m/s in a distance of 2.82 cm. What is its acceleration? Answer in units of m/s2
September 11, 2012

Science
How many mL of 80% v/v ethanol do you need to make 200 mL of a 50% ethanol solution in water?
September 11, 2012

math
eddie is thinking of a number between 149,000 and 150,000 his number has a tens digit that is 7 more than its ones digit. The sum of the tens and ones digit is 9 the sum. the hundreds digit is 0 what is eddies number
September 6, 2012

Science
How may 1.5 Liter water capacity diving cylinders can I fill to 200 bar from a 50 liter water capacity storage cylinder filled to 200 bar,leaving 25 bar in the storage cylinder, using a booster pump?
September 6, 2012

AP Physics
whta
September 5, 2012

chem
Hint: Remember that reactions happen in moles. So figure out the moles that reacted then use the molarity formula to continue solving the problem. What volume of 0.699 M K3PO4 is required to react with 68 mL of 0.661 MMgCl2 accord- ing to the equation 2K3PO4 + 3MgCl2 ! Mg3(PO4...
September 5, 2012

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