Tuesday
September 30, 2014

Posts by kc


Total # Posts: 116

physics
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...
September 2, 2014

science
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...
September 2, 2014

Science
A car converts 1000 J of energy from a sample of fuel. 750 J of heat (thermal energy) is produced by the engine, 150 J of heat is produced in the transmission, drive train, etc., and 100 J of work is done to move the car. How efficient was the process of burning fuel for the car?
August 8, 2014

Math
Helping grandson with math. I would like to know how to do it before he does. "How many different rectangles can be made with a perimeter of 20 units? (Remember, a square is also a rectangle.)"
May 25, 2014

Physics
A skater rotates 880 degrees clockwise, stops, and rotates counterclockwise for 340 degrees. What is her angular distance? Angular displacement?
August 6, 2013

us history
In many ways after the divisiveness and devastation of the Civil War, the United States searched for order economically, politically, geographically, socially and racially. Select one of these areas, or suggest another, and make a case for the reasons why it was the most vital...
December 5, 2012

algebra
steps to (.15x)+(-.3x)=
November 11, 2012

Math
A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions 12 in by 12 in by cutting out equal squares of side x at each corner and then folding up the sides as in the figure. Express the volume V of the box as a function of x.
September 10, 2012

Math
Find an expression for the function. Top half of the circle: x^2+(y-2)^2=4.
September 10, 2012

Math
A cylindrical can with both a top and bottom has the same surface area as a cube with edge 50mm. The height of the can if 6cm. Find the radius of the can to the nearest thousandth.
September 3, 2012

Chemistry
Rank the following from most polar to least polar (aspirin, caffeine, ibuprofen, acetaminophen): I am getting caffeine>acetaminophen>aspirin>ibuprofen. Is that correct?
September 2, 2012

Math
Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. cos x = x. How do I begin this problem? According to the theorem, a=0, b=1 and N=x?
September 2, 2012

Math
Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. x^4+x-3=0, interval (1,2). According the to theorem, I found that a is 1, b is 2 and N is 0. f(1)= 2 and f(2) = 17. Is the root (1.16,0)?
September 1, 2012

Math
Use a graph to find a number delta such that if abs(x-pi/4) < delta then abs(tanx-1) < 0.2. I understand that the epsilon is 0.2. But what step do I take next? How do I solve the problem?
September 1, 2012

Math
Prove that lim (x->0) x^4 cos 2/x = 0.
September 1, 2012

Math
Answer check please: Consider the circle (x-3)^2 + (y+1)^2 = 169. The point (15,4) is on the circle. Find an equation for the line that is tangent to the circle at this point. I got y= 5/12x-9/4.
August 26, 2012

Math
An oil tank is the shape of an inverted right circular cone with the pointed end down. The tank is 15 feet tall and is 12 feet in diameter at the top. At 1:00pm, the tank has oil 5 feet deep in it. Oil is pouring in at 5 cubic feet per minute. To the nearest minutes, at what ...
August 26, 2012

Math
A truck tire with a diameter of 36 in is rolling over level ground spinning at 11 rotations/second. If the speed limit is 55 miles per hour and the penalty is $20 per hour over the speed limit, should the driver be fined and if so, how much?
August 26, 2012

Math
An isosceles triangle has its vertex at the origin and the ends of its base on the parabola y=9-x^2. Express the area of the triangle as a function of the length of its base. Assume its base lies above the x-axis.
August 26, 2012

Chemistry
How many milliliters of a .5M HNO3 (aq) is needed to completely neutralize 100mL of a 0.10M KOH (aq)?
May 30, 2012

algebra
a bank teller has 52 $5 and $10 bills in her cash drawer. the value of the bills is $460. how many $5 bills are there?
April 18, 2012

chemistry
Which of the following pairs can be used to prepare a buffer? (select all that can apply) a. HCl/NaCl b. HF/KF c. NH3/NH4Cl d. HNO3/HNO2 e. NaNO2/HNO3 can you also please explain how they form a buffer? thank you
April 12, 2012

math
Jamal buys 59 stickers. Stickers come in packs of 5 or 8. How many packs of 5 stickers does Jamal buy? 8 stickers?
March 7, 2012

Biology
Which of the following would be the most sigificant between mitosis and meiosis? A. Chromosomes are duplicated before mitosis B. Meiosis is not followed by cytokinesis C. Homologous Pairs of chromosomes are split up in meiosis. D. Crossing over occurs in mitosis. So far i got ...
March 6, 2012

Math
Greta said that the product of two prime numbers must also be a prime number. Joan disagreed. Who is correct?
December 6, 2011

Math
Thank you so much!
December 5, 2011

Math
There are 189 students in the band. The difference between the number of boys and the number of girls is 27. How many boys and girls each are in the band?
December 5, 2011

Math
Thank you so much !!!!
December 5, 2011

Math
Jun-Jee either ran 5 or 7 miles each day for 30 consecutive days. His total mileage during this period was 166> How many days did he run 5 miles? How many days did he run 7 miles?
December 5, 2011

math
Thank you
December 5, 2011

math
If there are 264 students in a school and there are 84 eighth graders and There are 22 fewer seventh graders than sixth graders. Then which grade has the most students and how many students are there.
December 5, 2011

chemistry
CH4 + 2O2 ---> CO2 + 2H2O Delta H H2O= -285.8 kJ/mole Delta H CO2= -393.3 kJ/mole What is the standard heat of formation of methane, Delta H CH4, as calculated from the data above
November 18, 2011

trig
5. If the angles X and Y each measure between 0° and 90°, and if sinX = cosY, what is the sum of the measures of the angles X and Y?
November 17, 2011

geometry
How would you write that line segment PK has equal length with line segment OQ?
November 14, 2011

geometry
Thank you:) I got x=12 too but I wanted to make sure I was correct.
November 14, 2011

geometry
If FD=4x-27, and SG is congruent to FD and SG=2x-3, Then whais the length of SG?
November 14, 2011

algebra
You could demonstrate the process with an example by replacing the equal sign in the example with an inequality by using the less than or greater than sign (< or >) Then solve the inequality by your example. :)
November 14, 2011

Statisitcs
since the mean is a parameter of interest, it is a better estimate.
October 6, 2011

Animal Skeletal and Muscular Systems
wich of the fallowing muscles are used when breathing?
September 21, 2011

algebra
-rs^3-r^3s=
September 6, 2011

chemistry
Suppose the following: HO-C(H2)-C(H2)-OH + 2 HI --> I-C(H2)-C(H2)-I + water How many mL of the first compound* are needed to react with 9.3 grams of HI? (The density of the first compound is A = 1.11 g/mL) *by first compound, i mean HO-C(H2)-C(H2)-OH
September 2, 2011

pre cal 2
solve the equation 4cos^2x-1=0
July 24, 2011

pre cal 2
verify the identity tanx times cotx/cosx=secx
July 24, 2011

pre cal 2
find the exact solutions in the interval [0,2pi), sin4x=-2sin2x
July 24, 2011

Math
Thankyou Sir for helping me. I am studying for my tcap exam and some of the stuff on the test we didnt have time to cover because it snowed so much and we couldnt go to school.I think I no what I am looking for now. You have been a bunch of help.
April 9, 2011

Math
What addition property can you use to find the missing number? 8+(6+5)=8+(5+_)
April 9, 2011

Statistics
20
March 18, 2011

us history
My paper is on 3 reasons I would stay and fight 1. with so many men being sick or dying, I will stay and fight 2. freedom doesn't come cheap and anything of value is worth fighting for 3. the Congressional Committee that G. Washington brought over to Valley Forge will now ...
March 16, 2011

us history
I'm writing a paper about re-enlisting during the American Revolution, even though I'm miserable with the sick and dying all around me. I need to come up with a good grabber to start my paper with. Can you help?
March 16, 2011

Economics
How would a communist economy react to social and technological changes? What is the role of nature in a communist economy? I can't find any information on these subjects. Could someone please help me? Thanks so much
February 11, 2011

hcs/335
I do not understand it either. I cannot give the answer because I really don't know where to start. My confusion is in the culture, does it mean the "organizational culture", which could be the philosophies, values, etc... or the culture of the people in the ...
February 9, 2011

math
1.Robin has a certain number of dimes in his pocket. If the dimes were pennies, he would have $1.08 less than he has now. How many dimes does he have in his pocket?
January 27, 2011

math
1.Robin has a certain number of dimes in his pocket. If the dimes were pennies, he would have $1.08 less than he has now. How many dimes does he have in his pocket?
January 27, 2011

Math
A class has 12 students. In how many different ways can the students be put into lab groups consisting of 3 students in each group. The answer in the book is 369600. But I do not understand how they got this answer.
January 26, 2011

Math percentages
I have to compare two amounts given in percent. Last year, 80% of a cafe's sales were coffee; this year only 20% of the cafe's sales are coffee. How much has the percent of coffee sales changed over the past year. Is the answer simply down by 60% or is it more ...
January 10, 2011

college
6.25 is correct
December 16, 2010

Physics
A 7.0 kg bowling ball moves at 2.40 m/s. How fast must a 2.60 g Ping-Pong ball move so that the two balls have the same kinetic energy?
December 10, 2010

physics
A 726 kg car travels from Boone to Blowing Rock along US321. How much working is needed to keep the car traveling at a constant speed of 21.8 m/s around a curve of radius 28.4 m?
December 5, 2010

Physical Chemistry
The equilibrium constant for a reaction was measured at several temperatures and the data plotted at right. The slope and y-intercept of the plot are +3.25 kK and -4.04, respectively. Calculate ΔrH(std), ΔrS(std), and ΔrG(std) using this information.
November 10, 2010

Physical Chemistry
A 100 amino acid folded protein (F) is in equilibrium with it’s unfolded (U) (or denatured) form. Let ΔrH(std) =+347 kJ mol-1 and ΔrS(std) =-1010 J K-1 mol-1 for the equilibrium (F U) at 25℃. (a) Calculate the concentration of protein in each form if the ...
November 10, 2010

Physical Chemistry
Calculate the standard reaction Gibbs energy of the oxidation of ammonia to nitric oxide according to the equation 4 NH3g) + 5O2(g) → 4 No(g) + 6 H2O(g).
November 10, 2010

physical chemistry
Calculate the equilibrium constant (K) for the ammonia synthesis reaction at 25°C and show how K is related to the partial pressures of the species at equilibrium. Consider that the overall pressure is low enough for the gases to be treated as perfect. N2(g) + 3H2(g) ->...
November 10, 2010

math
If the ratio of onions to cilantro is 4:3 and I'm using 2/3 cup of onions, how much cilantro will I need?
November 8, 2010

Math
Fireworks are fired at an angle of 82degrees with the horizontal. They are expected to explode about 100 m in the air, 4.8 secs after they are fired. What is the initial velocity of a shell fired from ground level. I think I have to find the vertical and horizontal components ...
November 1, 2010

Physics
An artillery shell is fired with an initial velocity of 300 m/s at 65.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 37.5 s after firing. What are the x and y components of the shell where it explodes, relative to its firing point? x = ...
October 20, 2010

Physics
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 21.0 m/s. The cliff is h = 60.0 m above a flat horizontal beach. A)How long after being released does the stone strike the beach below the cliff? B)With what speed and angle ...
October 20, 2010

college
need help with miscrosoft excel 2010 spreadsheet IS 160
September 1, 2010

science
Provide specific examples from the Bridger Teton video as you defend your position.
June 17, 2010

math
a rabbit climb up a flight of 10 stairs and can only hop 1 or 2 steps each time. he never hops down, only up. How many ways can the rabbit hop up the flight of 10 steps?
June 7, 2010

biology
how is emigration and immigration not important factors when studying global human population growth?
May 25, 2010

algebra
list all the possible rational zeros of f using the rational zero theorem. then find all the zeros of the function. 1. f(x)=x^2-6x+5 2. f(x)=x^3+x^2-10x+8
May 23, 2010

biology
why is it important to understand challenges in a species' environment in order to understand the species' evolution? Relate your answer to what Darwin referred ti as "the struggle for survival".
May 22, 2010

english
In the book, When the Legends Die, what does it mean when Tom draws the deer in the dirt?
April 19, 2010

social civics
the three basic types of government: mayor-council plan, the commission, and the manger-council plan. give at least one strength and one weakness for them . and size of city where most effective thanks alot i cannot not seem to find this in my book
April 9, 2010

college
What are the three most important points you think a group of people must keep in mind when working collaboratively on a writing project? Why? Support your response with references to readings and personal experiences.
April 5, 2010

Math
Thanks.
November 24, 2009

Math
I'm having trouble with reciprocal functions. If a graph of a reciprocal function is given, how do you find its equation? Any help would be really appreciated.
November 24, 2009

Algebra
I need this question put into an equation. I have been working on this forever and cannot figure out! Please explain what you did. Thanks so much for your time! Mark sold 105 tickets for the basketball game. Each adults ticket cost $2.50 and each child's ticket cost $1.10...
October 14, 2009

Biology
1. A famous scientist once said that wherever in the universe life exists, some of those life-forms must be colored. Why would the scientist make such a statement? 2. One of the accessory pigments used in photosynthesis is beta-carotene, a carotenoid found in high ...
October 12, 2009

history
can u please give me a site tht will have a short but an informative article on the English Reformation? thnks
May 25, 2009

Physics
Thanks!
April 11, 2009

Physics
If a ball is sliding along a frictionless horizontal surface is the total work being done on the ball zero? I think so because there is no mention of applied force. Am I correct? P.S. On this holiday weekend, I want to send a BIG THANK YOU to all the teachers who very ...
April 11, 2009

Physics
Thank you very much!
April 6, 2009

Physics
Thanks. Is this the only way to calculate because in our lesson we only learned the formula for work =fd? We've haven't done KE yet.
April 6, 2009

Physics
I don't know where to start with this one. "Find the work done accelerating a 2 kg box from 2m/s to 3 m/s." Can't find acceleration because I don't know time. In fact, I don't see how any of the kinematic equations can help me out to find either ...
April 6, 2009

Physics
Thank you so much!!!
April 6, 2009

Physics
I have a follow-up to my question at 4:10 about work because I still can't figure it out. F-F(friction)=ma F-F(friction)=2*3 F-2.5=2*3 F=2*3 + 2.5 W=Fd W=(2*3 + 2.5)4 Distributing the "4" I get W=2*3*4 +2.5*4 Please help in pointing out where I have gone wrong. ...
April 6, 2009

Physics
Help!I'm really lost on this one.
April 6, 2009

Physics
Calculate the work done by the applied force accelerating a 2 kg object at 3 m/s/s over 4 m if there is a 2.5 frictional force of resistance. I calculated using F=ma=6N; then net force = 6N-2.5N=3.5 N so W=fd=14J. Did I do this correctly? Thanks
April 6, 2009

Physics
You guys are great! Now I get it!
March 26, 2009

Physics
I'm having a hard time with some free body diagrams. If you have a box on a slope/ramp and the angle of the ramp is X degrees why is it that the angle between the normal force and the gravitational force is also X degrees? Am I missing something obvious here?
March 26, 2009

Physics
Thanks. This explanation really helps me.
March 16, 2009

Physics
I'm comparing the "g-force" of a rocket and a race car. My answer for the race car corresponds to the answer in the book but my answer for the rocket is off by 1. The book says I need to add 1 G because the rocket is going upward. So, instead of my answer of .87 ...
March 16, 2009

physics
Thanks to you both!
March 13, 2009

com 220
Why would it benefit you to try various sites rather than just get used to one? Why is it good advice to look for content as well as the date of the publication?
October 9, 2008

sales tax
swaetshirts are on sale for 26 dollars and are 15% off. what is the sales price before tax
April 26, 2008

english
Can soneone help me to combine each of the following groups of simple sentences into two longer sentences. Thanks 1. Darryl works as a model. He has to look his best. He gained ten pounds recently. He had to take off the extra weight. He would have lost his job. 2. My aunt ...
March 10, 2008

Algebra 1b
Factor completely 100r^2 + 160rt + 64t^2
March 8, 2008

Algebra 1b
Find all numbers for which the rational expression is undefined. p^3 - 4p/P^2 - 4
March 8, 2008

Algebra
What does it mean to refer a 20-in television set or a 25-in TV? Such units refer to the diagonal of the screen. A 20-in set also has a width of 16 inches. What is the height?
March 7, 2008

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