Saturday
September 20, 2014

Posts by David


Total # Posts: 1,642

physics
A roller coaster travels 196ft at an angle of 61.1° above horizantally. How far does it travel horizantally?
September 10, 2012

Math
an air traffic controller spots two planes at the same altitude flying towards one another. their flight paths form a right angle at point p. One plane is 150 miles from point p and is moving 450mph. the other plane is moving at 450mph but is 200 miles from point p. write the ...
September 9, 2012

Precalculus
an air traffic controller spots two planes at the same altitude flying towards one another. their flight paths form a right angle at point p. One plane is 150 miles from point p and is moving 450mph. the other plane is moving at 450mph but is 200 miles from point p. write the ...
September 9, 2012

Math
what does -1 E-4 mean when you write it out?
September 6, 2012

Physics
You are traveling on an airplane. The velocity of the plane with respect to the air is 110.0 m/s due east. The velocity of the air with respect to the ground is 39.0 m/s at an angle of 30° west of due north. 1) What is the speed of the plane with respect to the ground? 2) ...
September 5, 2012

algebra
(3,0),0,-4).solve for length, standard form.thank you
September 2, 2012

algebra
(3,0),0,-4).solve for length, standard form.
September 2, 2012

algebra
(3,0),0,-4).solve for the following :
September 2, 2012

Health
The answer is K ;)
August 29, 2012

Math
Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 5 hours.
August 28, 2012

physics
A red ball is thrown down with an initial speed of 1.0 m/s from a height of 27.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
August 27, 2012

Physics
A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. The hare accelerates uniformly at a rate of 0.8 m/s2 for 4.4 seconds. It then continues at a constant speed for 13.5 seconds, before getting tired and slowing down with constant ...
August 27, 2012

physics with 6 questions
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.3 m/s2 for 3.9 seconds. It then continues at a constant speed for 13.7 seconds, before applying the brakes such that the ...
August 27, 2012

Physic
Type A nerve fibers in humans can conduct nerve impulses at speeds up to 139.8 m/s. How fast is this in mph? This is a question from my physic homework. I have tried converting 139.8 m/s to mile then to hrs and i got .000241 mph. When I input it it said this is not correct. ...
August 26, 2012

physics
A rolling ball moves from x1 = 3.2 cm to x2 = -4.2 cm during the time from t1 = 3.8 s to t2 = 6.1 s. What is its average velocity?
August 23, 2012

math
Estimate. 247 * 974 a. Write your estimate as a number sentence: ________________ b. How I estimated : ________________________________
August 21, 2012

Stats
Question 3 Investment analysts generally believe the interest rate on bonds is inversely related to the prime interest rate for loans; that is, bonds perform well when lending rates are down and perform poorly when interest rates are up. Can the bond rate be predicted by the ...
August 20, 2012

Stats
This assignment requires you to use Excel. In question 1, you will use the charting features. In questions 2 and 3, use the regression tool from the analysis toolpack. There is no template for this assignment. Make sure you explain your answers and provide the regression ...
August 20, 2012

Math
Joelle earns her regular pay of 7.50 per hour for up to 40 hours a week. for each hour over 40 hours of work in a week, joelle is paid 1.5 times her regular pay. how much does joelle earn for a week in which she works 42 hours?
August 14, 2012

psychology
After watching golf on TV several times with her father, 7-year-old Michelle learned how to swing a club even before she actually had one in her hands. What kind of learning took place?
August 12, 2012

health
HAHAHA ME TOO THIS ANSWERS ARE REALLY HELPFUL THANKS
August 11, 2012

Physics
How long would it take a car engine, say 500 pounds of iron, to cool from 1,200 degrees F (exauhst manifold temp) to air ambient temp. of 75 degrees F.
August 10, 2012

Physic
What is the source of the sun's energy?
August 7, 2012

Stastistic
Finde the mean , variance , standard deviation N-127, P=0.66
August 6, 2012

math
Frank's cell phone package costs $20 per month and an additional $0.05 per text. Josie pays $15 per month and $0.10 per minute. Determine the linear system that could be used to find out when their monthly bills would be the same.
July 28, 2012

MATH
Find the amount of interest and the monthly payment for the loan. Purchase a living room set for $3,800 at 12% add-on interest for 3 years.
July 28, 2012

statistics
Surgery vs. placebo for the knee pain: Refer to Example 10. Is Arthroscopic Surgery Better than Placebo? Here we show MINITAB output comparing mean knee pain scores for the placebo (group 1) to debridement arthroscopic surgery (group 2). a) State and interpret the result of ...
July 28, 2012

Physic
What are some sources of energy that are available to heat the interiors of planets?
July 26, 2012

science
2 WAYS TO DETERMINE THE INTERIOR ARE GRAVITY, AND SEISMOLOGY.
July 26, 2012

Science
How can we use Kepler's laws or Newton's laws to learn about these objects?
July 26, 2012

Astronomy
How were the different objects in the solar system discovered? What are the properties of the ice giants?
July 26, 2012

Physic
alive
July 26, 2012

calculus
How do I take the partial derivative of P with respect to r of the following: D ~ P = ‡”(t=1 to T)[t ~ (CF)_t/(1+r)^t ]
July 7, 2012

math
5x-y=22 x+9y=32
July 6, 2012

Physics?
In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 2.0 MeV heading directly for a gold atom (charge +79e). The alpha particle will ...
July 6, 2012

math
5040
July 6, 2012

Alg/Trig
(x-2)^2 + (y-3)^2 = 4.5^2
July 6, 2012

math ( pre algebra )
B. H
July 6, 2012

math
nonsense. let the three batteries by A,B,C then A = 2B 3A = C A + B + C = 54 so A = 12 B = 6 C = 36
July 6, 2012

math
How do I take the partial derivative of P with respect to r of the following: D × P = ∑(t=1 to T)[t × (CF)_t/(1+r)^t ]
July 6, 2012

Algebra 2
Thanks Ms Sue its my daughters problem ,my responce was maybe the wording might be asking "what investment " might be what amounts in what types of investments would yield the $4ooo. Or it might be just be about the math and analizing it. Either way ,thank you
June 5, 2012

Algebra 2
As a graduation present, you want to gift your son a trip to Disney World. Presently beginning his second semester as a high school junior, you hope you have enough time to save $4,000 to support much of the trips expenses for your child and two of his closest friends. Rather ...
June 5, 2012

english/grammar
I need help editing errors in parallelism in the following sentence: Is it true that Superman could leap tall buildings, run faster than a locomotive, and that bullets would bounce off his skin?
June 2, 2012

grammar
ops whats the first one
May 14, 2012

grammar
Whats the last one?
May 14, 2012

physics
or I've kept up with my homework and work this whole year except that our teacher just randomly decided to give us a ton of homework this weekend, and I have done all I can do. All of my friends are in the physics 1 class while this is physics 2 so no I cannot have answers...
May 13, 2012

physics
Hi, my teacher doesn't teach us too well and we have a few packets to hand in for tomorrow that I really don't understand much of. If someone could give me the answers to all of the problems on the first link if you search "the electrical energy converted to ...
May 13, 2012

Geometry word problem
A rectangular pond is 10m longer than it is wide. A walk 2m wide surrounds the pond. Find the dimensions of the pond if the area of the walk is 216m2
May 9, 2012

Geometry
A rectangualar playground is 4 meters longer than it is wide. If the length is increased by 5m, and the width decreased b y 1 m, the area is increased by 15m SQUARED(15M2).Find the original dimensions of the playground.
May 9, 2012

Math
How do i solve 2x+y > -3? And how do i graph it. This is Linear inequalities.
May 3, 2012

phisycal sciences
Which of the following properties did Rutherford use in his experiment? A. the negative charge of the alpha particles and the random distribution of protons B. the negative charge of the alpha particles and the positive charge of the gold foil C. the positive charge of the ...
May 3, 2012

Mathematics
Two numbers have thousandths other than zero. Could the difference of these numbers be 5.3? Explain.
May 2, 2012

algebra 2
Write an equation for a parabola with vertex at (3,- 6) and focus at (3,- 4).
May 2, 2012

chemistry
Is beta particles the answer?
April 30, 2012

chemistry
Which radioactive emanations have a charge of -1? beta particles alpha particles gamma rays neutrons
April 30, 2012

Algebra
-4x+1-2(x-1)= -4(x-4)
April 29, 2012

algebra
Write an equation of the hyperbola with foci (0, ) and (0, 2) and vertices of (0, ) and (0, 1).
April 29, 2012

spanish
Escribe el cual (la cual, los cuales, las cuales) o lo cual en el espacio. Nos invitaron a cenar con ellos, ____ fue una buena idea.
April 29, 2012

spanish
¿Cuál frase es correcta? El hijo del maestro, quien estuvo en mi clase, es muy inteligente. El hijo del maestro, a quien estuvo en mi clase, es muy inteligente.
April 29, 2012

algebra
When you spend $1 at the grocery store, the store doesn’t keep all of your money as profit. Some of it is reinvested in the economy when the grocery store buys more merchandise from suppliers. In turn, the suppliers don’t keep all of that money as profit, either; ...
April 28, 2012

Finance
Calculate the weighted cost of equity for a firm with the following characteristics: (a) Last Dividend--$5.00, (b) Growth Rate—6%, (c) Price of Stock--$125.00 and (d) Weight of Equity Capital—40%
April 27, 2012

English
Help me to write these answer question, Write an essay that illustrate the saying every cloud has a silver lining in 340 words
April 27, 2012

American Lit.
What is Fundamentalist-Modernist Controversy.? Is this one whole topic or more than one.?
April 24, 2012

computer programming
Make an Maplet that does the simple calculator funtions as addition, subtraction, multiplication, division, factorial, sin(), cos(), tan(). (using maplet in maplesoft)
April 22, 2012

physics
a one meter chain that weights one newton sits on a flat horizontal table that is one meter from the floor. the coefficient of friction between the chain and the table is 0.15. how much of the chain can dangle off the table until the chain pulls itself onto the floor? if it ...
April 20, 2012

College Algebra
log5 (x+2)+log5(x-2)=3
April 20, 2012

algebra
2(2x+5)-7<12 2(2(-5)+5)-7<12 2(-10+5)-7<12 2(-5)-7<12 -10-7<12 -17<12
April 16, 2012

geometry
A circle of radius r is centered at the origin and a rectangle is inscribed. The area of the rectangle as a function is given by what? Can you also explain the processes behind finding the answer it helps me understand.
April 15, 2012

Environmental Science
7 is D 10 is probably B because mosses are the first thing to grow naturally after the destruction of an environment like building a building 21 is D the y all effect marine ecosystems and are caused by humans 27 is D
April 15, 2012

Chemistry
Calculate the Concentration of Ni2+ in a soltion which prepared as mixing 50.0ml 0.0300 M Ni2+ and 50.0mlml 0.0500 M EDTA at pH= 3 At pH=3 , α4= 2.5x10-11 KNiY=4.2x1018
April 15, 2012

Chemistry
calculate the the pH of a buffer solution containing 0.246 M NH3 and 0.0954 M NH4Cl (for NH3 Kb = 1.74x 10-5)
April 15, 2012

Chemistry
what mass of AgBr is formed when a solution containing 3.45 g of KBr is mixed with a solution containing 7.28 g AgNO3?
April 14, 2012

chemistry
You have a 1 L container of a gas O 2 at 20°C and 1 atm. Subtracting the weight of the container, what is the mass of the gas?
April 6, 2012

physics
A truck covers m in 8 s while smoothly slowing down to a final speed of 2.8 m/s. (a) Find its initial speed. (b) Find its acceleration.
April 5, 2012

Chemistry
How many grams of water are formed when 250 mL of 2.0 M Mg(OH)2 are neutralized by a solution of HCL ?
March 23, 2012

Chemistry
How many mL of 3.0 M HCL are required to neutralize 250 mL of 2.0 M MgCL2 ?
March 23, 2012

MaTh AlgeBRA
Do synthetic division or long division Domain is all reals except x=1 because it gives you a 0 denominator.
March 22, 2012

Calculus
Let (3,1,-2) = C A+B=C B=C-A B=C+(-A) Do the addition component by component.
March 22, 2012

Chemistry
Both compounds are soluble, thus you have a double replacement reaction. Do stochiometry with the balanced reaction to find the concentrations.
March 22, 2012

Physics
Because of the symmetry in the path of a projectile, it will return to your hand with a speed of 40 m/s downward. Its total displacement is 0 since it returns to starting position. To find the distance traveled, multiply the height it reaches by 2. Find the height using ...
March 22, 2012

Physics
Assuming the angle of the throw was perfectly horizontal, x=v0*t=10*4=40m
March 22, 2012

physics
x=Vo*t since no forces act on the car in the x direction. Solve for t, t = x/v0^2 y=Vo*t+at^2/2 in this case, y = h, Vo in the y direction is 0, a = -g and use the relationship from before. Substitute solve for Vo^2 and your all done
March 22, 2012

math
x+x+3=57
March 22, 2012

Algebra II
x1/y1=x2/y2
March 22, 2012

conics
slope of PO= y/x slope of PN = y/(x-12) For segments to be perpendicular their slopes must be negative recipricols Thus, -x/y=y/(x-12) y^2+x(x-12)=0 Distribute the x, complete the square, and then you'll have the equation of a circle.
March 22, 2012

math
Draw a quadrangle below.Measure the sides to the nearest 1/2 inch.Write the length next to each side.Find the perimeter.
March 22, 2012

physics
Howstuffworks has a pretty thorough yet comprehensible explanation. I'd check that out.
March 21, 2012

CHEM
if something has a pH of 3.72 its not a base... did you mean pOH?
March 21, 2012

physics
T is period so you have frequency and period backwards
March 21, 2012

physics
use the formula T = 2*pi*sqrt(L/g) make sure you use SI units.
March 21, 2012

physics
Use the relationships 1 watt = 1 Joule / second E = mc^2 E = energy, m = mass, c = speed of light (3*10^8 m/s)
March 21, 2012

physics
you need to know that relationship that in that form, w = 2*pi*frequency thus w = 2*pi*525 2)cycles per 1 minute = 60 seconds *frequency = 60 * 535
March 21, 2012

math
13*3=39
March 21, 2012

math
6*10 + 10*(1/2) = 65
March 21, 2012

trig
Cosine is 0 at pi/2 3pi/4*t=pi/2 t=2/3
March 21, 2012

physics
w = 2*pi*period
March 21, 2012

physics
nevermind I thought it said that it began at its highest point. Since they didn't specify any initial conditions you're free to use either sin or cosine with no phase shift.
March 21, 2012

physics
It doesn't make a difference as long as your value for when t = 0 is correct since sin is just cosine phase shifted by pi/2. Cosine is probably easier in this case because then you wont need to do a shift.
March 21, 2012

physics
Period = time per cycle = 15 seconds frequency = 1 / period = 1/15 hz amplitude= 3 ft because its actually the distance from the center to each side. from there just put it into standard form.
March 21, 2012

Chemistry
It depends on the indicator. At the equivalence point, hypothetically they are equal. Most indicators however do not change color at exactly 7 and thus pH of the endpoint determines the concentrations of H+ and OH-
March 21, 2012

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