Thursday
March 26, 2015

Posts by David


Total # Posts: 1,769

Physics
I would say it is true that the center of mass of an isolated system moves at a constant velocity, as long as there is a constant force applied to it. Am I correct?
December 16, 2011

geometry/calculus
Use Cavalieri's Principle to find the area of the region. In the example we see a "leaning tower" with base 'a' and height 'b'. The left side of the leaning rectangle is given by y = x^2, the right side given by y = (x - a)^2 the answer to this ...
December 13, 2011

Physics
True or False: If a sphere of mass M and radius R and a cylinder of mass M and radius R start rolling down a ramp from the same location at the same time, they both reach the bottom of the ramp at the same time.
December 13, 2011

Physics
True or False: If a cannon fires a cannonball in an easterly direction, the tendency of the cannon to move to the west is a result of the principle of conservation of energy.
December 13, 2011

Physics
True or False: If no friction forces are present the work done by a force on an object increases either its kinetic energy or its potential energy.
December 13, 2011

math-probability
betsy goes running 2 days out of 7 and james goes running 5 days out of 7. What is the probability that one of them is running on any given day.
December 13, 2011

geometry
A farmer has 30yd of fencing and wants to enclose an area beside his barn. What are the dimensions of the region of maximal area, and what is that maximal area if the region is an is isosceles triangle with its base along side of the barn. Given -> legs of length 15, x = 1/...
December 13, 2011

chemistry
please, what is another name for double indicator titration and if the indicators are reversed is there any change in the result.
December 8, 2011

math
The ages of two children are 11 and 8years.In how many years time wil the product of their ages be 208
December 7, 2011

physics
if a tank was at 62 degrees farenhiet with a pressure of 14.7 psi. what would the presure be if the temperature rose to 178 degrees farenhiet?
December 7, 2011

math
X is a complex number. but X is not equal to 1. X^2011=1 Compute the sum X^(2n)/((x^n)-1) where n=1,2,3...2010
December 6, 2011

physics
Once a 28 kg crate is in motion on a horizontal floor, a horizontal force of 51 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s. What is µk, the coefficient of kinetic friction, between the crate and the floor
December 5, 2011

Physics
By what distance must two charges of +2 C and +10 C be separated so that the repulsive force between them is 3.70*10^10 N?
December 4, 2011

Physics
An iron ion contains 26 protons, 27 neutrons, and 23 electrons. What is the net charge of the ion?
December 4, 2011

Chemistry
help anyone?
November 29, 2011

Chemistry
the problem does not specify what the liquid is. that is part of my not understanding.
November 29, 2011

Chemistry
The osmotic pressure of a liquid at 320 K is 145 kPa. Calculate the freezing point of the solution.
November 29, 2011

Physics
If light in air is incident at 20°, at what angle is it refracted in glass?
November 27, 2011

Math
explain how you can use multdivide5 iplication to help you find 20 \\
November 27, 2011

Math
explain how you can use multiplication to help you find 20 divide by 5
November 27, 2011

chemistry
why is it necessary to make up to the 250 ml mark while during dilution?
November 27, 2011

Math problem
(a + b)/10 a = 68 b = 12 (68 + 12)/10 (80)/10 = 8
November 20, 2011

UNIVERSITY OF EDUCATION,WINNEBA
How would one use the elements of the marketing mix to advise a hairdresser?
November 18, 2011

Math
set up as a quadratic then solve for t 0=(8.98)t^2+55t-10 t=0.1767 seconds
November 18, 2011

Math
10ft
November 18, 2011

social studies
i to write a wellcome letter,wellcoming the new colonies to the United State and ease the fears
November 17, 2011

Physics
A small fish is dropped by a pelican that is rising steadily at 0.65 m/s. (Assume the positive direction is upward.) 1. After 2.5 s, what is the velocity of the fish? 2. How far below the pelican is the fish after 2.5 s?
November 17, 2011

science
what did galileo do in science that made him so famouse
November 17, 2011

physics
A mass m = 4.3 kg is attached to a vertical spring with k = 210 N/m and is set into motion. What is the frequency of the oscillation?
November 10, 2011

math
5th grade class of 16 students, one-half of the student arrived at school early, one-fourth arrived on time, and one-eighth arrived late. how many students were absent.
November 2, 2011

college algebra
use the given zero to find the remaining zeros of each function.g(x)=x^3+3x^2+25x+75;zero:-5i
October 31, 2011

math
Thanks, but that still makes no sense. If she SPENT a TOTAL of $43 which included $14 for socks and $18.75 for a wallet and had $4 LEFT, Why does the $4 even have to be in the equation? $43= $14 + $18.75 + LUNCH (X)
October 21, 2011

math
Why do you add the $4? My daughter missed this on a homework sheet because she didn't use the $4. Why should that even be considered?
October 21, 2011

math
Giselle spent a total of $43 when she went shopping. She spent $14 for socks, $18.75 for a wallet, and bought lunch. When she got home, she had $4 left. How much did she spend for lunch?
October 21, 2011

calculus
area of a semicircle is increasing at a constant rate. At 5 secs the area is 4pi. At 7 secs the area is 5pi. In terms of r at what rate is the radius changing?
October 20, 2011

OChem
A mixture of fluorene and benzoic acid is dissolved in diethyl ether and mixed thoroughly with an aqueous solution of NaOH. After the layers separate, what will each of the layers contain? Label the layers. Indicate the main components, not species that could be present in ...
October 20, 2011

Math
(9+8)*(7-6)*5+4*(3+2) = 105. You gotta add the parentheses first to get it to work. Remember that multiplication ALWAYS is done 1st.
October 19, 2011

math
How can you divide m by 3 using an input and out put table?
October 17, 2011

English Literature
What pictures did the author leave in your mind? (Tell-Tale Heart)
October 16, 2011

English Literature
How do these words set the mood for the story? (The Tell-Tale Heart)
October 16, 2011

English Literature
What special words does the author use to help you see hear, smell, and/or taste things in the story- The Tell- Tale Heart by Edgar Allan Poe?
October 16, 2011

trig
To the nearest degree, determine the measure of angle X for each value of tan X a. tan X = 0.49 Just not sure how to solve these questions
October 12, 2011

ciencias
que planetas tendrian esas mismas manifestaciones
October 9, 2011

ciencias
que planetas tndrian esas mismas manifestaciones
October 9, 2011

Statistics
Given IQ~N(100, 256) find P(IQ > 115). Be certain to set your calculator to FLOAT 4 to match my answer exactly. I need to know how to figure this out on my calculator.... no one has taught me how to use my calc and I am so confused.... someone please help!
October 8, 2011

calculus
Find the points at which the following function is discontinuous.Indicate the intervals at which the function is continuous. f(x)= (x^2 if x<-1), (|x| if -1<x<=1), (3x+1 if 1<x)
October 7, 2011

6th grade english
I'm helping out my sister with her english homework and I am confused on what to do. Underline the independent clauses once and the dependent clauses twice. Circle the phrases. Our football team is proud because the team is undefeated. The part that i don't understand ...
October 4, 2011

CHEM - ASAPPP
write the equation for the reaction of fecl2 with k3[fe(cn)6]???
October 2, 2011

bio-assap
if there were two proteins samples of exactly the same concentration but one sample contained a protein having a significantly higher number of arginine and lysine residues compared to that of the other sample - would there be a difference in the amount of dye bound to each ...
October 2, 2011

engineering science
A ramjet is to propel an aircraft at Mach 3 at high altitude where the ambient pressure is 8.5 kPaand the ambient temperature T-node is 220 K. The turbine inlet temperature T is 2540 K. If all components of the engine are ideal - that is, frictionless - determine (a) the ...
September 29, 2011

simplify
Correct!
September 28, 2011

Math
Simplify. 4(c squared - 1) + 1/3c(3c+6)
September 28, 2011

Geometry
Write a two column proof. Given: angle STV is congruent to angle TVU, angle STU is congruent to angle UVS. Prove: Angle SVT is congruent to angle UTV.
September 27, 2011

Algebra
At noon, your family starts out .from Louisville to go to Memphis driving at 40 mi/h. Your uncle leaves Memphis to come to Louisville two hours later. He is taking the same route and driving at 60 mi/h. The two cities are 380 miles apart. At what time do the cars meet?
September 27, 2011

geometry
write a biconditional for: the moon is the largest satellite of Earth.
September 21, 2011

english
Can you explain why? I am horrible at english. You can contact me at 601-870-6672 Please someone help me understand this new english 12 stuff....
September 21, 2011

Math
Using formular express the eqation. 5x2-6x-3=0
September 21, 2011

Physics
a rocket is launched at an angle of 53 degrees above the horizontal with an initial speed of 75m/s. It moves for 25 seconds along its line of motion with an overall acceleration of 25 m/s^2. What is its maximum height?
September 20, 2011

Math
Geometric Proofs.... Write a justification for each step Given: AB = EF, B is the midpoint of Line AC and E is the midpoint of Line DF. 1. B is the midpoint of Line AC and E is the midpoint of Line DF. 2. Line AB is congruent to Line BC and Line DE is congruent to Line DF 3. ...
September 20, 2011

Math
They both have the same amount of CD's. For minnie, 6 + 5 = 11 CD's For Amanda, 5 + 6 = 11 CD's So, 11 CD's = 11 CD's
September 20, 2011

Geometry
Geometric Proofs.... Write a justification for each step Given: AB = EF, B is the midpoint of Line AC and E is the midpoint of Line DF. 1. B is the midpoint of Line AC and E is the midpoint of Line DF. 2. Line AB is congruent to Line BC and Line DE is congruent to Line DF 3. ...
September 20, 2011

Chemistry
An object travels at a speed of 7500 cm/sec. How far will it travel in a day?
September 19, 2011

Geometry
The equation T = 0.03c + 0.05b relates the numbers of cans c and bottles b collected in a recycling rally to the total dollars T raised. How many cans were collected if $147 was raised and 150 bottles were collected? Solve the equation for c and justify each step.
September 17, 2011

science
how many liters of oxygen will react with 124.5 liters of propane
September 16, 2011

SIGS FIGS
WHAT ARE SIG FIGS
September 16, 2011

Science
What is the number of valence electrons for the element beryllium? Please help.
September 15, 2011

Physics
a worker drops a wrench from the top of a tower 90m tall. what is the velocity wgen the wrench strikes the ground?
September 14, 2011

Math
The organizers of of a walkathon get cost estimates from two printing companies to print brochures to advertise the event. The cost are given by the equations below, were C is the cost in dollars and N is the number of brochures. Company A: C = 15 + 0.10n Company B: C = 0.25n ...
September 13, 2011

Math
The organizers of of a walkathon get cost estimates from two printing companies to print brochures to advertise the event. The cost are given by the equations below, were C is the cost in dollars and N is the number of brochures. Company A: C = 15 + 0.10n Company B: C = 0.25n ...
September 13, 2011

Math Logic puzzle
A farmer has a goat, a wolf, and a cabbage. He wants to transport all three from one side of a river to the other. He has a boat, but it has only enough room for the farmer and one thing. The wolf willl eat the goat if they are left alone together, and the goat will eat the ...
September 12, 2011

math
i need to approximate profit in this equation 3. Hot Rocks Music sells CDs. If the profit can be approximated by following equation: , where x represents the number of thousands of CDs sold. Approximately, how many CDs must be sold in order for the company to make a profit?
September 12, 2011

MS. SUE HELP!
If 4.26 lb of chicken costs $6.77, what would 3.75 lb cost? PLEASE HELP ME MS. SUE D: CAN U PLEASE EXPLAIN ME B4 GIVING ME THE ANSWER
September 11, 2011

algebra
are u a teacher?
September 11, 2011

algebra
THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!! I GET IT NOW!!!!!!!! =)
September 11, 2011

algebra
You make 20 silk flower arrangements and plan to sell them at a craft show. Each flower arrangement costs $12 in materials, and your booth at the craft show costs $30. If you sell the arrangements for $24 each, how many must you sell to make at least $100 profit?
September 11, 2011

chemistry
x = (Br-)- 0.10 how do you get the actual answer for that problem if there is no ksp for it?
September 11, 2011

Math
Hello. I am trying to help out my sister and find patterns in numbers.... Ex/ 1+2 2+2 3+2 4+2 My question is... I can't figure out what the pattern is in the following set... 1 goes to 4 2 goes to 7 3 goes to 10 and 4 goes to 13...... I initially thought that it was 3x + 2...
September 9, 2011

Alg
4(q+p)
September 9, 2011

8th grade math
I need to know how to work this math problem: 3n + (-7) -5n +1
September 9, 2011

English
Is there anything else in the following sentence that needs capitalizing: "In January we are going to the Sierra winter carnival at Lake Tahoe."
September 8, 2011

Math
A band decides to sell protien bars to raise money for an upcoming trip. The cost (the amount the band pays for the protien bars) and the income the band recieves for the protien bars are represented on the graph below. A- how many protien bars must been sold for the band'...
September 8, 2011

Geometry
An angle measures 5 degrees more than 4 times its complement. What is the angle? I understand that the formula would be 4x+5 degrees. Would this be the answer?
August 31, 2011

math
Mike makees the following table of the distances he travels during the first day of the trip. A suppose Mike continues riding at this rate. Write an equation for the distance mike travles after t hours. B sketch a graph of the equation. How did you choose the range of values ...
August 29, 2011

8th grade math
Thank u; +)Damon
August 25, 2011

8th grade math
Hoshi walks 10 meters in 3 seconds. A. What is her walking rate? B. At this rate, how long does it take her to walk 100meters? C. Suppose she walks this same rate for 50sec. How far does she walk? D. Write an equation that represents the distance d that hoshi walks in t seconds.
August 25, 2011

Geometry
Ray SP bisects angle RST. m<RSP if m<RST = 5/2y degrees and m<PST = (y+5) M< = The measure of angle
August 23, 2011

science
A uniform beam 6m long and weighing 4kg rest on support p and q placed left and right 1m from each end of the beam. Weight of mass 10kg and 8kg are placed near p and q respectively. On ecah end of the beam. Calculate the reation at p and q
August 5, 2011

Science
What is the mass (in grams) of water that is produced when 100.0 grams of nitrogen monoxide is reacted with 75.0 grams of hydrogen according tho the following balanced eguation? 2NO + 5H2 = 2NH3 + 2H2O
August 4, 2011

physics
Damon, thanks for your answer. Consider that the 20lb object is being pulled behind a bid rig truck traveling at 90mph, can it then be calculated as to what amount of horsepower, is being provided to move (in our case) a 20lb object, traveling at 90mph. If yes,what amount of ...
August 2, 2011

Math
If 10=0.1 what does 28 equal?
August 2, 2011

physics
X horsepower is equal an 20lb. Object traveling at 90mph. Is it possible to solve for X? and if so, what does X equal?
August 2, 2011

chemistry
What is the result we get when NaOH and Na2CO3 solution are added to alcohol respectively in difference test tubes? (2)Discuss the reactions of aldehydes with fehling's solution.Give the relevant equation. (3)How would ethanoic acid react with ammonia(NH3) and sodium ...
July 20, 2011

chemistry
What is the result we get when NaOH and Na2CO3 solution are added to alcohol respectively in difference test tubes? (2)Discuss the reactions of aldehydes with fehling's solution.Give the relevant equation. (3)How would ethanoic acid react with ammonia(NH3) and sodium ...
July 20, 2011

chemistry
What is the result expected when alkanols are tested on a litmus paper ?
July 20, 2011

anth
What evidence do you see, in the book Dancing Skeletons, of a holistic study?
July 17, 2011

Statistics
In a survey, the guess at the mean age for the class had a mean of 21.9 and a standard deviation of 3.03. Given that Normally distributed populations have a first quartile of Z=-0.67 and a third quartile of Z=.67, what does this suggest about whether or not these guesses are ...
July 14, 2011

statistics
In our initial survey, the guess at the mean age for the class had a mean of 21.9 and a standard deviation 3.03. Using this information, what would be the first and third quartile be for the class? ( P(Z<.25) and P(Z<.75) respectively) I think you use the Z score formula...
July 14, 2011

statistics
In our initial survey, the guess at the mean age for the class had a mean of 21.9 and a standard deviation 3.03. Using this information, what would be the first and third quartile be for the class? ( P(Z<.25) and P(Z<.75) respectively) I think you use the Z score formula...
July 14, 2011

statistics
In our initial survey, the guess at the mean age for the class had a mean of 21.9 and a standard deviation 3.03. Using this information, what would be the first and third quartile be for the class? ( P(Z<.25) and P(Z<.75) respectively) I think you use the Z score formula...
July 14, 2011

statistics
In our initial survey, the guess at the mean age for the class had a mean of 21.9 and a standard deviation 3.03. Using this information, what would be the first and third quartile be for the class? ( P(Z<.25) and P(Z<.75) respectively) I think you use the Z score formula...
July 14, 2011

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