# 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 ...

**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...

**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. ...

**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 ?

**reading**

"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?

**7th grade math Ms. Sue please!**

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.

**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?

**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**

pleasee sumonee answerr this quick!!!!!!!!!! asap

**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