Friday
August 29, 2014

Posts by Katie


Total # Posts: 1,666

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

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

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

science
thanks again
September 20, 2012

science
pleasee sumonee answerr this quick!!!!!!!!!! asap
September 20, 2012

science
why is scientific inquiry a process with many paths, not a rigid sequence of steps?
September 20, 2012

science
thanks
September 20, 2012

science
how are the purposes of science and technology different?
September 20, 2012

Physics
Imagine a very large nonconducting plate that has a uniform surface charge density σ =1 μC/m2; it also shows a point charge Q = -3 μC at distance d = 0.3 m from the plate. Both are fixed in place. We choose the origin of an x-axis at Q. At what positive ...
September 19, 2012

Physics
Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
September 19, 2012

Physics
Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
September 19, 2012

precal
Solve for y: (y-(10/y))^2+6(y-(10/y))-27=0
September 18, 2012

precal
solve for x: (x^2-2x)^2 -11(x^2-2x)+24
September 18, 2012

Math
anyone. please. i can't finish my homework without this help. I would realllllly appreciate it.
September 17, 2012

Math
how would you find the inverse function of a problem when you have a squared number like f(x)=(x^2-4)^2 PLEASE HELP
September 17, 2012

Chemistry
I'm doing a chemistry lab called colorimetric equilibrium study of a complex ion. But I just have one question which is how to obtain CS which is the total stoichiometric molarity of thiocynate ion and CF which is iron (III) iron. Fe+3 + SCN --> Fe(NCS)^+2 Fe(NCS)^+2 + ...
September 13, 2012

Physics
A stone is thrown straight upward with a speed of 12 m/s from the edge of a 70 m high cliff. How long is the stone in the air? What is the speed just before it hits the ground? What is the total distance the stone traveled?
September 12, 2012

child day care
Jean Piaget was a A. factory worker. B. pediatrician C. developmental psychologist. D. child care provider.
September 12, 2012

statistics
if the mean=100 and the standard deviation=8, calculate p(x>108)
September 11, 2012

precal
(x^2+11)/(3-x) x=4i
August 21, 2012

precal
Preform the indicated operations and write the results in standard form. ( i= imaginary number) √-12(√-4-√2)
August 21, 2012

physics
in a baseball game a 0.2 kg ball moving at 12 m/s is hit by a bat. after the impact the ball moves in the opposite direction with a velocity of 18 m/s. if the force exerted on the ball of the batter is 670 N. how long is the time of contact
August 20, 2012

Algebra 1
Yes, I think I got it. h2+8h+-16 H2-16=0 H2=16 squareroot of 16 = 4
August 13, 2012

Algebra 1
How to find the product? For example (h+4)(h-4)
August 13, 2012

chemistry
A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________. A. 0.413 B. 0.386 C. 0.163 D. 0.579 E. 0.237
July 24, 2012

chemistry
Thank you so much that cleared up a lot!
July 24, 2012

chemistry
A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________.
July 24, 2012

History.
How did the role of the federal government change during the Progressive Era of the early 1900s. Include specific progressive legislation, discuss presidents and the enhanced power of the federal I need some help with finding some information and understanding
July 18, 2012

Math
What is the length of each side of a square that has the same area as a rectangle that is 12 mm long and 18 mm wide?
July 16, 2012

physics
A block is initially sliding along a horizontal surface with 24.6 J of kinetic energy. Friction causes the block’s speed to be halved in a distance of 3.20 m. a) What is the kinetic energy of the block after traveling the 3.20 m? b) What is the magnitude of the kinetic ...
July 16, 2012

biology
What are biomes and how are they influenced by latitude and elevation? Give Examples
July 12, 2012

divission
how do i do a 7 by 10 array look like
July 11, 2012

Physics
You (65 kg) are standing in an elevator traveling upward that passes the 3rd floor at 3.5 m/s and then passes the 4th floor at 4.5 m/s one second later. Find the normal force exerted on your feet by the elevator while it is passing between these floors. I got 6565 N, because ...
June 21, 2012

math
(35) + (-13) + (8) - (-6) = 35 -13 +8 + 6 = 49 - 13 = 36
June 20, 2012

math
4p + 9 + (-7p) +2 = 4p -7p + 9 + 2 = -3p +11 = 11-3p
June 20, 2012

math
4m + 9 + 5m -12 = 42 9m - 3 = 42 9m = 45 m = 5
June 20, 2012

math
y/9 + 5 = 0 y/9 = -5 y = -5 * 9 y = -45
June 20, 2012

math
3q+ 5 + 2q - 5 =65 5q = 65 q =13
June 20, 2012

math
-282 -(+1,017) -282 - 1017 = -1299
June 20, 2012

Physics
At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
June 18, 2012

Physics
At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
June 18, 2012

College Math
What is number of representatives in MS and what is the ratio of citizens to representatives?
June 16, 2012

UPDATE to Ms Sue
Thanks! I got it right the first time ,but I wasnt shure Thanks a ton!
June 13, 2012

UPDATE to Ms Sue
If JKL is similiar to DEF and JKl has sides that are 11 times greater than those of DEF what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times...
June 13, 2012

Update
If JKL is similiar to DEF and JKl has sides that are 11 times greater than those of DEF
June 13, 2012

Update
what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.
June 13, 2012

geometry
What is the area of a regular pentagon with a side length of 10 inches and a distance from the center to a vertex of 10 inches? Round your answer to the nearest tenth.
June 13, 2012

MATH
what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.
June 13, 2012

Update Geometry Question
What is the probability of a randomly tossed bean bag landing in the yellow target area? Gray is 2m and yellow 0.75m Use 3.14 for pi and round to nearest whole percent. A. 38 B.14 C.36 D.3
June 13, 2012

Math
I am a 4 digit number with 6 hundreds and 5 ones. The sum of all my digits is 15 .What number am I
June 6, 2012

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