# Posts by katie

Total # Posts: 2,096

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.

Physics
thank you

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 ...

trig proofs
cotx+tanx=secx+cscx

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

Calculus II
ok thank you very much. Happy New Year

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?

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

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

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

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/...

English
Thanks Ms.Sue :-)

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

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)

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.

Physics
Who originally designed the planetary model of an atom? Bohr or Rutherford

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 ...

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...

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. ...

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?

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

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

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. ...

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. ...

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

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. ...

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?

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.

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

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 ...

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?

physics
.436

social studies
what is the question to usa studies weekly 9

Division of Fractions
I need some help with this question too can give me a solution

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

College Physics 1
.767s

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? :)

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? :)

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.

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 ...

algebra
are you factoring? we are doing that right now if you need help

social studies
what religion was part of the Song Dynasty ?

"It's raining cats and dogs" is an idiom for "it's raining really hard."

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?

precal
We have to use the equation f(x+Δ)-f(x) ----------- Δx

precal
Find the Difference quotient: 4/(x-3)^2

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 :)

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?

I need help with this too! Math is hard for me right now...

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

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

chemistry
i do not understand how to work the problem out.

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?

Math
Yea I 100% trust me will pass too!

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) =

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

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?

U.S History
Why did slavery continue after the Revolution?

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

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

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

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.

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

algebra
3x^3+x^2-12x-4=0

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?

Check my Essay?
i like it

science
what are u learning about ?

science
thanks again

science

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

science
thanks

science
how are the purposes of science and technology different?

english
I think it's funny too that if somebody reads the actual question, then looks at the answer choices; They'll know that 5 is incorrect because they're looking for the denotative meaning (dictionary definition), which would be "young person" and not "...

english
Tamika, it's just a comment. If you read them all, you'd know that the first answers posted are wrong and that the ones by Natasha are correct. :)

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 ...

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 ...

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 ...

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

precal
solve for x: (x^2-2x)^2 -11(x^2-2x)+24

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

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

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 + ...

Math
My answers 1.b 2.A 3.d 4.b 100% correct

Math
My answers 1. D 2.A 3.c 4.b I got a 100% trust me will pass it

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?

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

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

Pre- Algebra
Follow the order of operations 1. Solve what is in the parthneses first 2. Exponent 3. Mutiplication 4. Division 5. Addition 6.Subtraction Trust me my answers are correct and you will past the test 100% correct

Pre- Algebra
9. 2s^3 -4r^2 r=1 s=5 2(5)^3-4(1)^2 Step1. 2(5)^3 5^3 = 125 125*2= 250 Step2. 4(1)^2 1^2 =1 4x1=4 Step3. 250-4= 246 So, 2(5)^3-4(1)^2 = 246

Pre- Algebra
1. Is -7 x-7 x-7x-7x-7 2. A 3. D 4. Is 1/3 5. 1/2 6. Square root of 3 7. 1 1/2 8. 0.57 can be written as a fractions decimal and integer. For example 0.57 can be written as 57/100. Trust me my answers are correct. Will get a 100%

math
And number 1 is 1 1/2

math
2. Is 4 batches 3. Sqaure root of 3 is a irrational number 4. Is 1/2 5. Is 4^8 6. 1/3 7. Positive 81 8. A 9. 2(5)^3 - 4(1)^2 =246 5^3 =125 125x2 =250 1^2= 1 4x1 =4 250-4 = 246 10. 0.57 is rational number because it can be written as a fraction, decimal and integer. For example...

precal
(x^2+11)/(3-x) x=4i

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

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

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

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

English 11
1. personal 2. reflective 3.intesive

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

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