Friday
December 19, 2014

Posts by katie


Total # Posts: 1,716

report
thank you
February 19, 2013

report
What are key findings? I have to include this in a lab report. Thank you for any help
February 19, 2013

Physics
A plant falls from the windowsill of an apartment in a very tall building. If the floor of your apartment is 12.19 m above the ground, and it takes the plant 0.2580 seconds to cross your 9 ft window, from what height did the plant fall? ? m Explain what would be different if ...
February 19, 2013

math
14=2/3(9y-15)
February 18, 2013

science
How do I make an acrostic that has to do with the word Wavelength?
February 17, 2013

Statistics
These are the only ones that I am having problems with. Please help.. 8.You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the ...
February 17, 2013

Chemistry
On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.5898kJ?
February 9, 2013

Chemistry
Ooops, sorry Linda.
February 9, 2013

Chemistry
On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.898 kJ?
February 9, 2013

science
Newton’s Second Law of Motion is expressed as F = ma. If you are pushing a lawn mower in your backyard and suddenly double the pushing force, what will happen to the lawn mower's rate of acceleration? The mass of the lawn mower is constant. A. The acceleration will ...
February 8, 2013

math
Jill is correct because angels is on any shape
February 5, 2013

math
thanks
February 5, 2013

math
I got (9,28) is that right.
February 5, 2013

math
solve using substitution y=4x-8 y=2x+10
February 5, 2013

Physics
According to Anna, on Earth, Bob is on a spaceship moving at 0.8c towards Earth, and Carl, a little farther out, is on a spaceship moving a 0.9c towards Earth. According to Bob, how fast is Carl moving relative to Earth? (a) According to Bob, how fast and in what direction is ...
February 4, 2013

social studies
Which of the following types of information are people LEAST comfortable revealing to professionals? a. emotional b. financial c. legal d. medical
February 4, 2013

Chemistry 3A
You want to make the following buffer: 5% glucose, 100 mM tris and 10 mM EDTA in a final voume of 300ml. Your stock solutions are 20% glucose, 1M tris and 0.5M EDTA. The diluent is distilled water. Determine how much of each you will add to make the desired buffer. I know this...
February 1, 2013

Math
Calculate how long a de-orbit burn must last in minutes and seconds to achieve the Shuttle’s change in altitude from 205 miles to 60 miles at perigee.Use the equations and conversions provided below in method 1 or method 2 to find the required burn time
February 1, 2013

penn foster
im trying to finish these classes soon so i can start college, but honestly they are too complex. and i NEED HELP!!!! I have 1-5 done. 6. In the Mongol Empire, the plague A. provided new oppurtunities for territorial expansion B.ended further expansion C. had no effect, ...
January 30, 2013

physics
Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's ...
January 30, 2013

Physics
Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's ...
January 29, 2013

College Algebra
V= 4/322/7r^ 3 v= 4/3 *22/7*(6 1/4 in)^3 v=3/4 * 22/7 * 15625/64 v= 1023.065476 how to change to a mix-number?
January 27, 2013

College Algebra
I like to change this(1023.065476) whole number into a mix-number to find the volume of the sphere (6 1/4 in) using 22/7 for pie.
January 27, 2013

geometry
if measure of angle SUT=3x+6 and measure of angle RUS=5x-4, find measure of angle SUT
January 27, 2013

science
Lipids: Not a polymer because _ __x's energy than carbs Saturated= Unsaturated= Nucleic Acids: RNA= DNA= Carbohydrates: Building blockks
January 26, 2013

science
I think it's about 20.
January 26, 2013

science
How many amino acids are there in protien
January 26, 2013

Math
I am a 4digits number with 6 hundreds and 5ones.The sum of all my digits is 15 .What number am I
January 25, 2013

Math 7A
Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function. can someone help me i'm stuck on this question
January 21, 2013

alg/trig
The first thing you want to do is get rid of x in the denominator, because that simplifies things quite a bit. Think of the easiest common denominator between 9/x and 9/(x-2), which would be x(x-2). You know that x-2/x-2 = 1, regardless of the value of x; the same with x/x, so...
January 21, 2013

Math
10^5.4 = 251188.6432 = 2.5 X 10^5 You can just plug this in the calculator. I think it's two significant figures
January 21, 2013

Physics
t(Earth) = t(satellite) / (square root) 1 - (v/c)^2 = t(satellite) / (square root) 1 - [ (3.9 x 10^3) / (3x 10^8)^2 ] = (1 - 1.7 x 10^-10)^ - 1/2 [ t(satellite) ] t(Earth) = (1 + 8.5 x 10^-11) [ t(satellite) ] GMEarth = (6.67 x 10^-11 N x m^2/kg^2) (5.98 x 10^24 kg) = 4.0 x 10...
January 21, 2013

Physics
A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both regular/speed-...
January 21, 2013

Math
7 snow days divide by the the amount of days in december which is 31 days (7/31) x 100 = 22.5 %
January 21, 2013

math
How would I write 2 inequalities that describe in basketball that 2 points = field goal and 1 point = free throw and I have scored at least 3 points in every game this season and 15 points for the most points in one game? Please Explain! I don't understand.
January 21, 2013

Math
Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function.
January 18, 2013

Physics
thank you
January 18, 2013

Physics
The kinetic energy of a proton is half its internal energy. What is the proton's speed? Kinetic energy is (Yu - 1) (mp) (c)^2 = 1/2 (mp) (c)^2 Yu = 1.5 Yu = 1/(square root) 1 - (u/c)^2 1/(square root) 1 - (u/c)^2 = 1.5 u= 0.745c How do I solve for u? I'm extremely ...
January 18, 2013

trig proofs
cotx+tanx=secx+cscx
January 15, 2013

Math
Number Sense How can you use 4 x 7 to find 8 x 7? Find the product.
January 8, 2013

Calculus II
ok thank you very much. Happy New Year
December 30, 2012

Calculus II
Find x and dx using trigonometric substitution of (integral) square root of 4x^2 - 9 divide by x x = 2/3 sec x dx = 2/3 tan x dx Is this right so far?
December 30, 2012

Calculus II
ok, thank you very much. Happy New Year
December 30, 2012

Calculus II
Okay then, is this the final answer = (5-x)(3e^3x) + (integral) -- (1/3)e^3x = (5-x)(3e^3x) + (1/9)e^3x + C
December 30, 2012

Calculus II
Integrate using integration by parts (integral) (5-x) e^3x u = 5-x du = -dx dv = e^3x v = 3e^3x I wonder if this is right so far. = uv - (integral) v du = (5-x)(3e^3x) - (integral) (-3e^3x) =(5-x)(3e^3x) + (integral) (3e^3x) = (5-x)(3e^3x) + 9e^3x + C
December 30, 2012

Chemistry
Question: A solution of Silver nitrate, AgNO3, contains 1.08 grams in 250 cm3. What is its molarity? Solution: Molar mass of Silver nitrate = 108 g/mole. n(AgNO3) = 1.08 grams of AgNO3 x 1 mole of AgNO3108 grams AgNO3 = 0.01 mole. Number of moles in 1 dm3 = 0.01 mole x 1000/...
December 30, 2012

Physics
11 4 n + B ----> ___?___ + He 2 7 8 A. Li or B. Li 235 4 Pa ------> ___?___ + He 91 2 A.230 or B. 231 Ac Ac
December 18, 2012

math
the expression a^2(b^3)/a^-4(b^2) is equivalent to 1 a^6/b^5 2. b^5/a^6 3. a^2/b 4. a^-2(b^-1)
December 18, 2012

Physics
A car and a bus are moving down a hill, the bus is 3X heavier than the car and the speed of the car is 3X faster than the bus. Compare their momentum and K.E.
December 17, 2012

Physics
Who originally designed the planetary model of an atom? Bohr or Rutherford
December 17, 2012

physics
Maxwell's equations proved that a. Light is a mechanical phenomena b. Light is a chemical phenomena c. Light is a phenomenal phenomena d. Light is an electromagnetic phenomena I think the answer is either a or d. But I'm pretty sure its d Thank you for any help and ...
December 16, 2012

8th Grade English
My teacher for my english class at school marked off for these questions and said I could redo it and turn it in tomorrow. I am for sure I did these right. Here are the questions. Underline the verb in the parentheses that agrees with the subject. 1. In the Northern Hemisphere...
December 11, 2012

Physics, asap please
If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
December 10, 2012

Science
What is the Mass number and Atomic number for the element B (Boron)? It is for a homework sheet and I am blanked out. I forgot my text book. Can anyone help me?
December 10, 2012

Chemistry 3A
You have three moles of oxygen and hydrogen. And 1 mol of aluminum as well as one mole of aluminum hydroxide
December 10, 2012

Chem
PV = nRT - Change pressure to atm - Change grams of oxygen to mol of oxygen for n - Change degrees in celsius to kelvin which in this case is 273 K. Write all of the units of P, n, R and T and it will cancel out to get liters for volume
December 10, 2012

Physics
If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
December 10, 2012

Physics
If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
December 9, 2012

Physics
Pretend the hot brick extracts heat from the cold brick and becomes hotter. Would this violate the Law of Conservation of Energy?
December 9, 2012

Physics
If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
December 9, 2012

Physics
A rapidly changing magnetic field in any region of space induces a rapidly changing A.Magnetic field or B.Electric field? which in turn induces a rapidly changing A.Magnetic field B.Electric field?
December 8, 2012

Physics
If your own mass is 70kg and the mass of a building is 4x 10^6kg and the distance between you and the building is 1m, in comparison to your own weight, estimate the force of attraction between you and the building.
December 8, 2012

Physics
A car weighing one ton is moving at 50km/hr and a truck weighing two tons is moving at 25km/hr. Both are moving in the opposite direction, which has more momentum? I think they are the same, but want to make sure
December 8, 2012

Physics
While stationary on a boat you are measuring the time it takes for the coin to leave your hand and hit the water.In order to measure that time you are tuned to the sound of the coin hitting the water. You know that it takes 5.5 seconds for the coin to leave your hand and hit ...
December 8, 2012

Physics
If one drops a sphere and a piece of paper from the same height of 10 meters(H=10m) and the sphere hits the ground in 1.4 secs and the paper in 2 secs, what is the gravity associated with the sphere and why did the impact time change between the paper and sphere?
December 8, 2012

physics
.436
December 6, 2012

social studies
what is the question to usa studies weekly 9
December 4, 2012

science
What does it mean to be a successful organism? Is bacteria the most successful organisms on earth?
November 29, 2012

College Physics 1
.767s
November 28, 2012

ENGLISH
hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
November 27, 2012

english
hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
November 27, 2012

College Physics
Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet.
November 27, 2012

physics
The range of human hearing extends from approxmately 20 HZ to 20 000 HZ. Find the wavelenghts of these extremes when the speed of sound in air is equal to 343 m/s. A dolphin is 25 degrees C sea water emits a sound directed toward the bottom of the ocean 150 m below. How much ...
November 21, 2012

algebra
are you factoring? we are doing that right now if you need help
November 21, 2012

social studies
what religion was part of the Song Dynasty ?
November 18, 2012

reading
"It's raining cats and dogs" is an idiom for "it's raining really hard."
November 8, 2012

Physics
A 60 mm mortar round is capable of being launched at 540 km/hr. If a target is located at a distance of 0.6 km and the mortar takes 7.5 s to reach the target, at what angle must the launcher be set to hit the target?
November 7, 2012

precal
We have to use the equation f(x+Δ)-f(x) ----------- Δx
November 6, 2012

precal
Find the Difference quotient: 4/(x-3)^2
November 6, 2012

algebra
Writing an equation in standard form is good for using the quadratic formula, because it has A, B, and C. I hope that helps :)
November 5, 2012

AP Chemistry
A 2.50 L balloon is filled with helium gas at sea level, 1.00 atm and 32 degrees celsius. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 228 mm Hg and the temperature is -44 degrees celsius, what is the volume of the balloon?
November 1, 2012

7th grade math Ms. Sue please!
I need help with this too! Math is hard for me right now...
October 30, 2012

chemistry
To what volume must 25.0mL of 18.0M H2SO4 be diluted to produce 1.50 M H2SO4?
October 28, 2012

chemistry
A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?
October 28, 2012

chemistry
i do not understand how to work the problem out.
October 28, 2012

chemistry
If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?
October 28, 2012

MATH
Given Pr(a)= 0.9, Pr(C|A)= 0.78 and Pr(D|B) = 0.38. find a. (A|C) = b. (A|D) = c. (B|C) = d. (B|D) =
October 22, 2012

physics
A hydrogen atom has a diameter of about 10.1 nm. Express this diameter in meters, millimeters, and micrometers.
October 22, 2012

Finite---- PLEASE HELP
A biologist finds that 32% of fruit flies have short wings and 27% have eye defects. Assuming these two events are independent, what is the probability that a randomly selected fruit fly has neither short wings nor eye defects?
October 22, 2012

U.S History
Why did slavery continue after the Revolution?
October 17, 2012

Algebra
sorry, having a brain malfunction but which is a function: "x is a student y" "x is the biological daughter of mother y"
October 8, 2012

living enviornment
what is the average length of a single cell in micrometers? a)2,000um b)100um 3)10um 4)200um
October 4, 2012

math
The rate is: type # of vehicles car 6 truck 10 SUV 14 Mini Van 15
October 4, 2012

physics
The Hubble Space Telescope orbits Earth 621 km above Earth's surface. What is the period of the telescope's orbit? Give answer with 5 significant figures.
October 3, 2012

english
use words 9-15 in a creative story. can you please help me!! besiege ephemeral altruism carrion erotic amorphous opulent I KNOW WHAT THEY MEAN I JUST NEED HELP FIGURING OUT HOW TO USE THEM IN A STORY
October 1, 2012

algebra
3x^3+x^2-12x-4=0
October 1, 2012

Physics
A crate with a mass of 50 kg has a coefficient of static friction with the floor of 0.8 and a coefficient of kinetic friction of 0.25. If it is pushed with a force of 425 N, how long will it take to move it across a 65 meter horizontal floor?
October 1, 2012

Check my Essay?
np
September 20, 2012

Check my Essay?
i like it
September 20, 2012

science
what are u learning about ?
September 20, 2012

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