Tuesday
October 25, 2016

# Posts by Marina

Total # Posts: 178

physics
A race car track has been constructed with the a bank angle of 32.7° so there is no friction force. The race car track has a curve radius of 394 m. What speeds, for the race cars, has the track been designed to accommodate?
October 23, 2016

physics
a 280. kg crate, to the right of the pulley, is released from rest and begins to fall to the ground. If the mass on the left is m=160. m=160. kg, what is the magnitude of the tension of the rope attached to the 280. kg crate? Assume the rope and pulley are massless.
October 19, 2016

physics
A group of construction workers are building a house and want to lower down an excess bundle of 2390 kg bricks to ground. They tie one end of a rope to the bundle of bricks, loop it through a pulley, and tie the other end of the rope to a toolbox. If the coefficient of ...
October 19, 2016

physics
A row of blocks are lined up with masses of 1.10 kg, 2.72 kg and 4.05 kg. The masses are then pushed forward by a 14.3 N force applied to the 1.10 kg block. If the table is frictionless, how much force does the 2.72 kg block exert on the 4.05 kg block?
October 19, 2016

math
A 1963 Chevy Bel Air, a classic car today, cost \$2400 new in mid-1963. How much would that be in 2012 dollars?
August 14, 2016

math
if inflation had been 3% each year from 2002 to 2012, what would theCPI have been in 2012?
August 14, 2016

math
I need help
April 27, 2016

Math
Thank you Steve very much
March 1, 2016

Math
Simplify and evaluate the expression for a = -0.5, b = 2.5 2.5a - 3b(-4.1 + a(-3.3b - b) - b) + a
March 1, 2016

Math Terminology
Is it correct, then, that 7 is the constant and the entire thing is the equation?
January 16, 2016

Math Terminology
Identify all the components of this statement: 3a + 2b = 7 Is this an equation or an expression and why? constant variable term expression equation I believe it is an equation because it has an equal sign I believe the constant is 7 because that never changes I'm not sure ...
January 16, 2016

Math
thank you Ms. Sue!
January 16, 2016

Math
Thank you, John, that makes perfect sense.
January 16, 2016

Chemistry
The solubility of insoluble substances changes depending on the nature of the solution. Below are two solutions in which copper (II) hydroxide is dissolved; in each case, the solubility is not the same as it is in pure water. a. For each solution state whether the solubility ...
January 3, 2016

Chemistry
An iron nail with a mass of 0.750 g was dissolved in dilute sulfuric acid and diluted to 100.0 mL volume. A 10.0 mL aliquot of this solution was then titrated with standard 0.200 M potassium permanganate solution, according to the following equation: MnO4- + H+ +Fe2+ --> ...
January 3, 2016

algebra
find an equation of the linear function f using the given information ; f(x) increases by 6 when x increases by 3.
December 9, 2015

Trigonometry
I am having trouble solving this. A rocket tracking station has two telescopes A and B placed 1.7 miles apart. The telescopes lock onto a rocket and transmit their angles of elevation to a computer after a rocket launch. What is the distance to the rocket from telescope B at ...
October 27, 2015

Algebra
I am having a hard time with this question. A boat went 15 miles downstream in 1 hour and then returned upstream to its dock in 5/3 hours. if the current of the stream was constant, find the speed of the boat in still water and the speed of the current
October 27, 2015

Math
6 m of soil containing 50% clay was mixed into 10 m of soil containing 10% clay. What is the clay content of the mixture? How much salt should be added to 80 pounds of a 5 % salt solutio to make it a 24% salt solution Thank you so much!
October 26, 2015

math
Thank you Reiny for your help
October 26, 2015

math
Mrs. Crawford has invested \$ 6,000 at 3% interest. How much additional money should she invest at 8% interest so that the total income will be 4% of her total investment? Scott asked you to make 10 gal. of fruit punch that contains 85% fruit juice by mixing together some Sweet...
October 26, 2015

math
Thank you so much Steve
October 25, 2015

math
Mr Joyce invested \$ 25,000, part at 4% interest and the remainder at 7% interest. The total income he received from his investment was \$1,450. How much did he invest at each interest rate? Thank you
October 25, 2015

College Algebra
Find the time required for an investment of 5000 dollars to grow to 7900 dollars at an interest rate of 7.5% per year, compounded quarterly
September 24, 2015

College Algebra
A wooden artifact from an ancient tomb contains 45% of the carbon-14 that is present in living trees. How long ago, to the nearest year, was the artifact made
September 24, 2015

Algebra
A wooden artifact from an ancient tomb contains 45 percent of the carbon-14 that is present in living trees. How long ago, to the nearest year, was the artifact made
September 24, 2015

Algebra
You go to the doctor and he gives you 13 milligrams of radioactive dye. After 20 minutes, 4.5 milligrams of dye remain in your system. To leave the doctor's office, you must pass through a radiation detector without sounding the alarm. If the detector will sound the alarm ...
September 24, 2015

Pre Calculus
The doubling period of a baterial population is 10 minutes. At time t=80 minutes, the baterial population was 50000 1What was the initial population at time t=0 2Find the size of the baterial population after 4 hours
September 24, 2015

Psychology & operational definition
I apologize for not being specific. The examples I gave, I'm curious if they would be examples of an operational definition.
March 22, 2015

Psychology & operational definition
I came up with some examples on my own, but I'm not sure if I'm heading in the correct direction. Any help would be great. Here are my examples: 1. My grandmother's recipe for red velvet cake 2. An actress has memorized her lines when she can repeat all of her ...
March 22, 2015

Algebra
How to simplify 6y (3y <squared -1) We are doing trinomials
February 25, 2015

Thank you Reed for the tip and thank you so much GanonTEK for the help!! Much appreciated!
February 17, 2015

I know what an epic simile is but I'm trouble finding two epic similes in these line I've given below. And I also need to know why I think the author used these two epic similes Please help! Here's the lines I have to find the two from : The Odyssey : Book 9 "...
February 17, 2015

math
For volume all you have to do is multiply all three numbers by each other. Your problem would be 4 times 18 times 7 = 504 cm CUBED!! Don't forget to add the units to the end results. Because if you had cm squared that would be saying it was another type of measurement.
February 12, 2015

You need the definitions first. Irrevocable - cant be changed, reversed or recovered. Its always going to be final. I'm not sure how to give a definition of express because that is more of an expression so we can eliminate B. Interested - Having an interest or involvement...
February 12, 2015

Science!!!
yeah sure
February 11, 2015

Science!!!
No the answer is not D. Its not D because since the forces are being pushed into opposite directions, (being pushed together) you would NOT add. The answer is A. Its A because there is still force coming from the left side. So when they are opposite of one another (different ...
February 11, 2015

Math
whats the question..?
February 11, 2015

social studies
Advantages of a reconstituted family: 1. More support- more siblings around you for further support 2. Develops tools in preparation of living with others for potential roommate situations in the future. 3. Creates a team environment 4. Physical and Emotional Support: ...
February 11, 2015

scince conditon
I'm not able to get on my email yet.. But when I can ill be sure to contact you and you can ask me whatever it is..
February 11, 2015

scince conditon
Well, you definitely need to start sitting up straight. (i hope that you are now) But it really depends on how serious your condition really is. If it is serious your doc SHOULD have given you a brace to wear so your spine doesn't curve more and more. Which type curve you ...
February 11, 2015

Math
15.24 divided by 24 equals 0.64.. BUTTT.. Make sure you know the order of the problem because by simply switching 15.24 and 24 make a difference sooo.. 24 divided by 15.24 equals 1.57 (1.6) See the difference? so make sure you know the order and it will one of those two ...
February 11, 2015

Math
Yeah it is and no problem.. But like i said don't forget to put it as 3.7 (only if your teacher is picky about rounding)
February 11, 2015

Math
You have to add all together, then take that sum and divide it by how many numbers there are. For instance you have 3 numbers . So you would do 4.3 + 3.7 + 3.13 which equals 11.13. Then you take that number and divide it by 3 which is equal to 3.71 or just 3.7 depending on if ...
February 11, 2015

English HELP!!!!😰😰
At the minimum, a prepositional phrase will begin with a preposition and end with a noun, pronoun, gerund or clause, the "object" of the preposition. The object of the preposition will often have ONE OR MORE modifiers to describe it. Heres a couple examples : "...
February 11, 2015

health
>Numerous< is the answer. Capillaries form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and ...
February 11, 2015

Art - Drawing
Thank you bobpursely and Ms.sue(:
February 11, 2015

Art - Drawing
Can you give me some tips on how to draw graffiti (anything really)? I am good with drawing something but the thing is I have to look a picture to draw it. Its almost as if I don't have enough imagination. But since that's how I've been drawing, tips please?
February 11, 2015

Spanish
Yes we have been through the alphabet and verbs, nouns and endings. (: and I appreciate you taking the time to help me out. But we don't necessarily use our text books as often. Its mostly her teaching and us doing hands on worksheets and etc. And I do believe that I am a ...
February 11, 2015

Spanish
I am currently in Spanish 1. I am gradually catching on to Spanish, but my question is.. Can you help clarify to me when I should put a small word before a verb or noun.. for instance "los libros" How do I know whether its La, los and etc.? I know it has something to...
February 11, 2015

Spanish
This means "you ask many times as a main course" If anything, the easiest route you can take to finding a word or sentence out is using google translate. If it seems like its taking forever to get a response or if you need the answer right away. Hope I helped (:
February 4, 2015

Math
Express sin(x+y+z) in terms of cosines and sines of x, y and z
May 13, 2014

Math
An isosceles triangle has an area A, an apex angle 2 theta, and a height of h. Determine an expression for theta in terms of A and h.
May 13, 2014

Physics
Starting from rest, a horse pull a 250-kg cart for a distance of 1,5km. it reaches a speed of 0,38m/s by the time it has walked 50,0m and then walks at constant speed.fictional force 260n.each gram of oats the horse eats releases 9kJ of energy. 10% of this can go into work the...
May 8, 2014

Math
The table shows the number of people switching to a new telecommunications company over a 7-day period in August. Day=number of people 1=10 2=17 3=37 4=79 5=106 6=231 7=500 Using this estimate how many people will switch on august 31st. * it's an exponential and ...
May 7, 2014

Math
The table shows the number of people switching to a new telecommunications company over a 7-day period in August. Day=number of people 1=10 2=17 3=37 4=79 5=106 6=231 7=500 Using this estimate how many people will switch on august 31st. * it's an exponential and ...
May 6, 2014

Ok, I might have figured this one out but I am not sure so someone else feel free to correct me if I'm wrong. first I found the torques around the two points T=r*(m*-9.81)+r*(m*-9.81) make sure for the radii you use the center of mass for the diver the distance from the ...
March 24, 2014

Physics
Ok, I might have figured this one out but I am not sure so someone else feel free to correct me if I'm wrong. first I found the torques around the two points T=r*(m*-9.81)+r*(m*-9.81) make sure for the radii you use the center of mass for the diver the distance from the ...
March 24, 2014

Physics
just realized I forgot to turn 70g into kg so ignore the answer I gave for work It should be 101.61 (just moved the decimal over three places)
March 24, 2014

Physics
I might be wrong but I may have just figured out how to find the tension even though it is not the way they wanted since the order is wrong but using the work we found we can probably use W=Fd and say the distance is the change in radius to get the force on the string. I hope ...
March 24, 2014

Physics
Based on the fact that this is the exact same problem I am doing at the same time of the year I am guessing you might have been in physics 221 at Iowa state. If you are also in this class this may help you Paul, I have not figured out the tension part but a) momentum is ...
March 24, 2014

pre-calculas
correction of problem. Should be: -2x squared + 6x + 5 = 0 Sorry about that! Thanks for your help!
February 16, 2014

pre-calculas
Use "completing the square" to find the zeros of the polynomial. =2x squared + 6x + 5 = 0
February 16, 2014

pre-calculas
find the LCD and solve: x+3 12x + 4 1 - 2x ____ + _________ = _______ 3-x x squared - 9 x + 3
February 16, 2014

pre-calculas
simplify the following complex fraction: x ____ -2 x-5 _____________________________________ x squared - 9x - 10 ____________________ x squared - 25
February 16, 2014

pre-cal.
simplify: 2(x+h)squared+5(x+h)-6-(2x squared + 5x - 6)
February 16, 2014

pre-calculas
rationalize the denominator: 5 + the sq. rt. of 3 ________________________ 4 + the sq. rt. of 3
February 16, 2014

physics
A girl with a mass of 83 kg is climbing in a tree 20 m above the ground. If she lands on a trampoline with a constant of 312 N/m, how far will the trampoline stretch and how fast will she be moving just prior to landing on it?
January 23, 2014

physics
A bomb is dropped out of a plane 100 m above the ground, how fast will it be moving when it hits the ground?
January 23, 2014

physics
A golfer hits a ball off a tee from an elevated platform 13m above the ground. if the golf ball leaves the tee at 85 m/s @ 15 degrees, find the flight time, the maximum height above the ground and the horizontal displacement of the golf ball.
January 20, 2014

physics
A soccer ball is kicked off of the ground at 17 ft/sec @ 30 degrees. Determine the maximum height above the ground the ball reaches and how far downfield the ball lands.
January 20, 2014

physics
A boy runs off the edge of a 5 foot high wall @ 2.5 ft/sec. How long will he spend in the air? How far from the base of the wall will he land?
January 20, 2014

physics
How much force is needed to accelerate a 125 kg block up a 35 degree include at 3.4 m/s2 if the coefficient of friction is 0.28?
January 20, 2014

physics
A 625 N crate, which is at rest on the floor, is pulled along the floor by a horizontal force of 85 N. The coefficient of friction is 0.11. How far will the crate go in 4.5 seconds?
January 20, 2014

physic
What is the necessary coefficient of friction needed to keep a 1200 kg car on a road moving at a speed of 27 m/s on a turn with a radius of 30 meters?
January 20, 2014

physics
Two cables suspend a 500 N sign above the hallway. The left cable makes a 40 degree angle with the ceiling and the right cable makes a 50 degree angle with the ceiling. What is the tension in the left and right cables?
January 20, 2014

physics
What is the apparent weight of a 55 kg person in an elevator accelerating downward at 2.2 m/s2?
January 20, 2014

physics
25x 45 = 1125 9.6 meters = 9600 km 9600/2 = 4800 1125/4800 = .234375
January 20, 2014

physics
Compute the force of attraction between a 25 kg. mass and a 45 kg. mass that are 9.6 meters apart from center to center.
January 20, 2014

physics
A 50 foot see-saw has 4 kids sitting on it. A 62 lb. girl sits on the left end, with a 76 lb. girl sitting 2.5 feet in front of her. On the right side, a 96 lb. boy sits on the end and has another boy sitting 2.5 feet in front of him. How much does this other boy weigh?
January 20, 2014

algebra
How do i write an equation of a line with the given slope and y-intercept for m= 2/9, b=3?
November 20, 2013

world geography
The largest mass migration in human history has taken place in china. why ?
October 23, 2013

Biology
Caenorhabditis elegans hermaphrodites have six different homologous chromosome pairs: five pairs of autosomes (called I-V) and one pair of sex chromosomes (called X). Hermaphrodites can either self-fertilize or they can be fertilized by males (which only have one X chromosome ...
October 7, 2013

Chem
An analysis of generic antacid tablets labeled to contain 250mg of CaCO3 (MM= 100.09g/mol) per tablet of active ingredient was performed. The analysis was performed by dissolving a 0.550g sample of the antacid tablet in 75.00mL of 0.1055M HCl. The excess acid was back-titrated...
October 6, 2013

calculus
Find all vales for a so that f(x) { x+1...x<=a { x^2...x>a is continuous
September 25, 2013

calculus
If lim(f+g)=1 as x-->a and lim(f-g)=1 as x-->a find lim fg as x-->a
September 18, 2013

Algebra
Could you elaborate on how you got that answer
September 6, 2013

Algebra
Factor x^4+64
September 6, 2013

A wheelchair ramp is said to have an angle of 4.5° with the ground. the deck at the top of the ramp is 20 inches above ground level. a) how long should the ramp be? round your answer to the nearest tenth of an inch. c) how far from the deck should the ramp begin? Round ...
August 22, 2013

Math
circle the word that completes each sentence
August 14, 2013

college application
i am using common app and they asked to write about : Indicate a person who has had a significant influence on you, and describe that influence. so is it only one person or could be more?
December 18, 2012

French
Hi! This is my final French paper and I would be really appreciative if someone could look it over before I turn it in. Merci! Le Mariage de ma Mère et Michael Dans ma vie, je me souviens des évènements plus que les autres, et certains sont plus importants...
December 14, 2012

College Algebra
In an assembly line of a factory, which produces networking switching hubs, two robots are utilized. The first one (A) is able to produce 40 microchips per hour, whereas the second one (B) produces 30 microchips per hour. For a total production of 400 microchips, the two ...
November 16, 2012

World History Honors
What kinds of people sailed to the New World in the 1400s?
October 24, 2012

World History Honors
What kinds of people sailed to the New World in the 1400s?
October 24, 2012

biology
draw digrams of phases of meiosis in a cell with 2N=. include with both divisional sequence, but not draw any of the subdivision of the phase e.g early prophase. distinghish between chromosomes from each parent, and detail the event of synapsis, recombination and crossing over...
September 26, 2012

mat
you are correct that 12.5555... is a rational number equal to 113/9, but how did you know that? Which characteristic exactly indicates that 12.5555... can be written as a fraction?
September 2, 2012

chemistry
Thx! for Mole of H2O: I took 76g since it is 100g of 24%NaOH solution ???? Then, Mole of H2O: 76/18=4.222 Mole of NaOH: 24/39.997=0.6 Total moles: 4.222+0.6=4.822 X1=4.222/4.822=0.876 P1=0.876x760=665.76 mm Hg
May 20, 2012

chemistry
Pvap (mm-Hg) of 100g 24%NaOH in H2O @100C? When Pvap pure H2O @100C is 760mm-Hg Pls where to start solving this problem? What is the equation? What are the staeps to get to the right answer?
May 20, 2012

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