Sunday

March 1, 2015

March 1, 2015

Total # Posts: 417

**AP Physics**

A 2.8 kg mass hangs at one end of a rope that is attached to a support on a railroad car. When the car accelerates to the right, the rope makes an angle of 9.0° with the vertical, as shown in Figure P4.68. Find the acceleration of the car.
*October 5, 2010*

**AP Physics**

A woman at an airport is towing her 17.0 kg suitcase at constant speed by pulling on the strap at an angle of θ above the horizontal (Fig. P4.40). She pulls on the strap with a 26.0 N force, and the friction force on the suitcase is 10.0 N. What angle does the strap make ...
*October 5, 2010*

**12th grade Math - word problems**

84.33
*September 20, 2010*

**Chemistry **

Calcium chloride has been used to melt ice from roadways. Given that the saturated solution is 32% calcium chloride by mass, estimate the freezing point. Express your answer in degrees Celsius. Assume that calcium chloride behaves ideally in solution.
*September 14, 2010*

**physics**

To measure the height of a tree, you throw a rock directly upward, with a speed just fast enough that the rock brushes against the uppermost leaves and then falls back to the ground. If the rock is in the air for 2.1 s, how tall is the tree?
*September 7, 2010*

**physics**

To measure the height of a tree, you throw a rock directly upward, with a speed just fast enough that the rock brushes against the uppermost leaves and then falls back to the ground. If the rock is in the air for 2.1 s, how tall is the tree?
*September 7, 2010*

**physics**

Consider a rock that is thrown off a bridge of height 27 m at an angle θ = 24° with respect to the horizontal as shown in the figure above. If the initial speed the rock is thrown is 12 m/s, find the following quantities: (a) The time it takes the rock to reach its ...
*September 6, 2010*

**physics**

I solved for h and got 210.2. What am I doing wrong?
*September 6, 2010*

**physics**

could you possibly explain A. im still not understanding it.
*September 6, 2010*

**physics**

A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? m (b) How long after lift-off ...
*September 6, 2010*

**chemistry**

-10KJ
*September 5, 2010*

**College Physics**

thank you
*August 22, 2010*

**College Physics**

2 questions: a)Assuming that water has a density of exactly 1 g/cm3 (cubed), find the mass of one cubic meter of water in kilograms. b)Suppose that it takes 10 hours to drain a container of 5700m3 (cubed) of water. What is the "mass flow rate," in kilograms per ...
*August 22, 2010*

**math**

yes you suppose to multiply the squared polynomial...but i was not to sure. Here is what I have for an answer... x^4-8x^3+28x^2-48x+36
*July 21, 2010*

**science**

the atomic mass of N is 14 u and that of Ca is 40 u. the proportion of n by mass in the compound Ca3N2 is what?
*June 19, 2010*

**physics**

x-rays produced in an x ray machine can have a frequency of 1.4*10^14 what is the wave length of these electromagnetic waves in nm?
*June 8, 2010*

**Algebra**

more than $7000 to reach her goal.
*June 3, 2010*

**algebra**

Yes. Answer choice A is correct. If you simply take the one factor they gave you, which is 2x+y, and multiply by answer A, which a-b, you get 2ax-2bx+ay-by
*May 31, 2010*

**ethics**

explain the ethics of public service. why must all criminal justice professionals adhere to such a set of ethics.
*May 16, 2010*

**ethics**

given the fact that there is no national religion in the US, what application do the ethics of religious testaments have on the average American criminal justice practitioner?
*May 16, 2010*

**ethics**

Explain the hierarchical rule of identities. How could such a hierarchy influence the decisions of a cia agent stationed in a foreign country?
*May 16, 2010*

**ethics**

Explain the Edwin Meese synddrome, giving examples from the fields of probation and parole
*May 16, 2010*

**Science**

The centers of rebound are probably the places where the ice first accumulated. The centers of rebound are probably places where the ice was thickest.
*May 12, 2010*

**Math SAT Sheet **

1.) Find the domain and range for: f(x)= 4x-20/ the square root of 36-x^2 2.) Solve the equation: log6 (x-11) + log6 (x-6) = 2 3.) Solve the inequality: x^2 - 2x - 3 is greater than 0
*May 2, 2010*

**math**

100
*May 1, 2010*

**AP Chemistry**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 22, 2010*

**AP Chemistry**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 22, 2010*

**AP Chemistry**

Thank you! For part B I did the same thing only this time I used 3.00 L. However I can't seem to find the value of x... I am coming up with 0.0191, but when I substitue that in I do not come up with 5.84 x 10^ -3
*April 22, 2010*

**AP Chemistry**

It is N2O4 ==> 2NO2 with Kc= 5.83 x 10^-3 (the arrow is actually a double headed arrow to symbolize equilibrium) Sorry for the misunderstanding! I didn't realize the arrows were like that
*April 22, 2010*

**AP Chemistry**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 22, 2010*

**CHEMISTRY HELP NEEDED A.S.A.P**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 22, 2010*

**CHEMISTRY HELP STILL NEEDED PLEASE!!!**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 22, 2010*

**CHEMISTRY HELP DESPERATELY NEEDDED!!!**

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations if the volume of...
*April 21, 2010*

**IT**

If I have a steel cable pulling 5 degrees from straight down by 1500lbs. This cable goes up to the top of a 10 foot pole and is attached. Then I have a cable going out 20 feet in the opposite direction back to the ground. How many lbs. of force will be pulling at the end by ...
*March 30, 2010*

**physics**

A 5.0 kg book is sitting on a table. Which describes the force acting on the book a. there are no forces acting on the book b. the force of the table upward is greater than the force of gravity downward c. the net force on the book is zero d. kinetic energy counteracts the ...
*February 26, 2010*

**algebra**

So is the line between the -3 and 2 like a divison sign?
*February 21, 2010*

**algebra**

Evaluate and tabulate the values of y for the value(s) given. y = 2x3, for x = -3, 0, 1, 4 Can someone explain how to set this up? I do not know what the question is wanting me to do.
*February 21, 2010*

**college english**

I need to know if there are any grammatical errors in the following rewritten paragraph. Thank you. However, dictionaries are often wrong about this; in fact, by putting one word first, they are supporting a self-fulfilling prophecy. Consider the entry “ax or axe”, ...
*February 5, 2010*

**Health Administration**

Bayside insurance offers two health plans. Under plan A, Giselle would have to pay the first $60 of her medical bills, plus 25% of the rest. Under plan B, Giselle would pay the first $250, but only 20% of the rest. For what amount of mediacl bills will plan B save Giselle ...
*January 15, 2010*

**physics**

does anyone know who conducted the experiment or a credible description of the experiment that helped prove Einstein's thought experiment: the twin paradox? as in the experiment in which one cesium-beam atomic clock stays on Earth, while another one takes flight and the ...
*January 10, 2010*

**physics **

thankyou! i just need one more now and am having a hard time..
*January 10, 2010*

**physics **

is anyone aware of evidence (preferably experimental evidence) in support of time dilation. in other words proof that it actually occurs. that is, experiments other than the one of Hafele and Keating. i just need a starting point for some research.. just a name or the title of...
*January 10, 2010*

**Impossible chemistry problem**

Kinetics Challenge Problem Consider the following reaction: CH3X + Y → CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8...
*January 8, 2010*

**Science Projet**

johnson's
*January 8, 2010*

**physics**

Would you see the same thin film interference pattern in a film of soap surrounded by air and a film of soap on glass? Why or why not?
*January 6, 2010*

**physics**

Would you see the same thin film interference pattern in a film of soap surrounded by air and a film of soap on glass? Why or why not?
*January 6, 2010*

**physics**

What up what up what up
*December 6, 2009*

**math**

how to write two differnt word phrases for the expression t 30
*December 3, 2009*

**Math**

Thank you very much. I wrote my question incorrectly. It should be the cost of renting buses (plural). Would that be something like 350 times n/60?
*December 1, 2009*

**Math**

the total cost for a school bus rental is 350$/day. Each bus holds 60 students. Find the cost (c) of renting the school bus as a function of the number of students going on a trip (n). My answer: I have come up with relating the 350$ to n/60 but i am stuck on where to go from ...
*December 1, 2009*

**Physics**

Please someone help me I'm desperate!!!! Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 420.0 N of tension. String B has a diameter of 1.3 mm and is under a tension of 840.0N . Find the ratio of the wave speeds,VA/VB , in ...
*November 20, 2009*

**physics**

A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
*November 17, 2009*

**Physics**

Hi I'm kinda new here, and hope someone can please help me out. A person exerts a tangential force of 38.1 N on the rim of a disk-shaped merry-go-round of radius 2.74 m and mass 207 kg. If the merry-go-round starts at rest, what is its angular speed after the person has ...
*November 12, 2009*

**physics**

your wrong
*November 9, 2009*

**Physics**

ok what i like to do is list what i know. the elastic cord stretches from 28m to (36-4)m so x=36-4-28=4m m=680N h1=36 h2=4m the question is asking for k ok lets start mgh1 = mgh2 + .5kx^2 .5kx^2 = mg(h1-h2) k = 2mg(h1-h2)/x^2 k=2720
*October 12, 2009*

**blah**

Wow. I WAS going to register and ask for some help myself due to the lack of comprehension in my readings, but I would not want MS SUE discouraging my needs.... Good luck with that MS SUE.
*September 29, 2009*

**MATH**

Determine the x-intercepts for y = x^3 + 4x^2 - 4x - 16 and for y = 2x^4 - 5x^2
*September 18, 2009*

**Pre-Algebra**

Solve 0 = 3x - 4
*July 15, 2009*

**language arts**

For the second question the answer is: coup and cup
*May 6, 2009*

**database**

How many conflicts are there in the schedule Sa: r1(Y); r2(Y); w1(Y); r1(Z); w2(Y); w1(Z)
*April 21, 2009*

**Database**

22. Which one of the following schedules has a conflict? A) Sa: r1(X); r1(Y); r2(Z); r1(Z); w1(X); w1(Z) B) Sb: r1(X); r2(X); r1(X); r1(Y); r2(X); w1(Y) C) Sc: r1(Z); r2(X); w1(Z); r1(Y); w1(Z); w2(X) D) both a and b
*April 21, 2009*

**PHYSICS PLLZ HELP**

1- wave velocity is related to a- period b-wavelength c-amplitude d-all of these 2- wave amplitude is related to a- wave velocity b- frequency c- energy d-wave length 3-which of the following radiation has te smallest frequency? a- infrared b- visible c- ultraviolet d-x-rays 4...
*April 14, 2009*

**math**

how can you find the length of a line of a isosceles trapezoid?
*April 10, 2009*

**math**

Samuel has read 5/6 of his assignment. Judy has read 10/12 of her assignment. Who has read more?
*March 9, 2009*

**Social Science**

Can someone summarize E.K. Hunt's "The Conflict in Mercantalist Thought" briefly? Im not sure I understand the piece.
*February 10, 2009*

**government**

define: a powerful government leader
*January 14, 2009*

**math**

Round the number 23.5724 to two decimal places
*January 10, 2009*

**Intermediate Accounting**

Python Company leased equipment from Hope Leasing on January 1, 2006. Hope purchased the equipment at a cost of $232,666. Other information: Lease term 3 years Annual payments $90,000 on January 1 each year Life of asset 3 years Fair value of asset $232,666 Implicit interest ...
*November 29, 2008*

**4th grade**

210 kids in class. one out of 7 in left handed the rest in right handed. how many are right handed.
*November 12, 2008*

**calculus**

Find an equation of the tangent line to the curve at the given point. y = 3x^2 - x^3, (1,2)
*October 14, 2008*

**calculus**

THe equation of motion of a particle is s = t^3 - 3t, where s is in meters and t is in seconds. Find (a) the velocity and acceleration as functions of t (b) the acceleration after 2 s, and (c) the acceleration when the velocity is 0
*October 14, 2008*

**math**

how do u get the answer? A nurse has to record her temperatures in Celsius but her thermometer reads Fahrenheit. A patient's temperature is 100.7° F. What is the temperature in °C
*September 11, 2008*

**math**

If 8x + 5x + 2x + 4x = 114, the 5x + 3 =
*September 11, 2008*

**math**

Employees of a discount appliance store receive an additional 20% off of the lowest price on an item. If an employee purchases a dishwasher during a 15% off sale, how much will he pay if the dishwasher originally cost $450?
*September 11, 2008*

**math**

The sales price of a car is $12,590, which is 20% off the original price. What is the original price?
*September 11, 2008*

**math**

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
*September 11, 2008*

**math**

If Lynn can type a page in p minutes, what piece of the page can she do in 5 minutes?
*September 11, 2008*

**math**

you need 39% correct out of a %100 tesy how many would u need right
*September 10, 2008*

**finance (risk premium)**

The correct answer is "C"
*July 25, 2008*

**Research Writing**

What strategies does an author use to formulate an argument?
*July 8, 2008*

**eth125**

THAR BOTH CONTRIES
*June 19, 2008*

**journal assignment**

how many liters of a 10%solution of acid should be added to 20 liters of 60%solution of acid to obtain a 50%solution?
*June 2, 2008*

**space**

what kind of galaxy is the milky way?
*May 20, 2008*

**MATH (SURDS)**

we have been asked to prove that it is possible to determine the value of a surd using either similar figures or Pythagoreans theorem. we have been shown how to construct the surd using a compass and ruler. but we now have to prove that our method is correct. we know that (...
*April 23, 2008*

**trig**

A geologist stands on the shore of a lake in Ontario with a theodolite and finds that the angle of inclination to the top of a distant rock pillar is 28.5 degrees. He then walks 10 m along the shore at a 90 degree angle to his measurment, and finds that the angle to the same ...
*April 16, 2008*

**English - Critique Essay Please**

Thanks for the ideas, yoink!
*March 26, 2008*

**algebra**

ii.The top of Mt McKinley (20,430 feet above sea level) My Answer: w = 99.96 pounds 2. The equation D=1.2(sqrt)h which should read D equals 1.2 square root of h gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a. Solve this ...
*March 1, 2008*

**algebra**

ii. The top of Mt McKinley (20,430 feet above sea level) My Answer: w = 99.96 pounds 2. The equation D=1.2(sqrt)h which should read D equals 1.2 square root of h gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a. Solve this ...
*March 1, 2008*

**algebra**

You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1.Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies ...
*March 1, 2008*

**math-patterns**

what is the next number in the pattern 6,38,932,1087,12437
*February 14, 2008*

**Math**

6x-10>2x+6 4x-10>6 4x>16 x>4
*February 14, 2008*

**Math**

If the sum of the ages were unique, then the mathematician would have been able to solve it after the second piece of information...
*September 21, 2007*

**physics**

A uniform electric field of 500. V/m is directed in the negative x direction. A +15ìC charge moves from the origin to the point (x,y) = (20.0 cm, 50.0 cm). (a) what was the change in the potential energy of this charge? (b) Through what potential difference did the ...
*September 8, 2007*

**genetics**

Can anyone help me with Genetics? I have some problems and answers and need them explained to me. Here are some of the questions and answers: 1. Assume that a dihybrid cross is made in which the genes' loci are autosomal, independantly assorting, and incompletely dominant...
*September 8, 2007*

**math**

thanks Iblis
*September 8, 2007*

**math**

lim as x approaches 0 of (3 sin 4x) / sin 3x
*September 8, 2007*

**Algebra**

search: "graphing" on google
*September 8, 2007*

**math**

the words are in alphabetical order eight, five, four, ....
*September 7, 2007*

**Math- Best Buy**

In comparing prices of canned peaches, Darren finds that a 10-oz can costs 98 cents, a 16-oz can costs $1.49, and a 24-oz can costs $2.35. Which is the best buy? My Guess: 10-oz*2.4=24-oz 2.4*$.98=$2.35 16-oz*1.5=24-oz 1.5*$1.49=$2.24 24-oz=$2.35 Best Buy- 16-oz for $1.49In ...
*July 2, 2007*

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