Recent content by pooker

Okay this isn't really a problem, but I want it explained too me instead of the books way. We are doing a section on mechanical energy, and for the entire course with vectors, force, etc, we have always used rcostheta and rsintheto to find an x and y force. Now tell me why we do this? Is...

nvm I got it. I didn't use significant figures

Homework Statement The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-4.80 107) t 2 + (2.45 105) t, where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine...

Homework Statement A small boat is being pulled toward a dock that is 10 feet above the water. The rope is being pulled in at a rate of 1.5 feet per second. Find the rate at which the angle the rope makes wit hthe horizontal is changing when 20 feet of rope is out. Homework Equations...

Homework Statement Our teacher gave us a bunch of problems, and this is one of the ones I am having problems with. What are the values of a syste that contains .450 M HCN and .230 KCN Homework Equations Ka = 4.9 x 10^-10 The Attempt at a Solution Well I tried a few different...

Homework Statement 1. How much energy does it take to heat 95.3 grams of water from -10 degrees celcius to 35 degrees celcius? 2. How much energy does it take to cool water from 125 degrees celcius to 75 degrees celcius? Homework Equations specific heat of water in solid is 2.06...

Our teacher wants us to find derivatives the long way f(x+h) - (fx) / h So anyways, on one of my questions 3 / x + 2 , x=8 I know how to find the derivative of 3 / x+2 , but why was their an x=8 next to it? Am I supposed to plug this in after finding the derivative?

Homework Statement Find an equation for the tangent to the curve at the given point. Then sketch the curve and tangent together Homework Equations y=3-x^2 (-1,2) The Attempt at a Solution slope = f(x + h) + f(x) / h f(-1 + h) + 2 / h 3- (-x + h)^2 + 2 / h 3 - 1 + 2h + H^2 + 2...

How would I find it if the roles were reversed, let's say cos2theta = 1/3 and find costheta? I understand the double angle formula, but I do not understand howto apply it in this case.

I do not need you to give me an answer just a formula I have some problems to work and I cannot find anything through searching, I can make up a problem, but for example find sin3x if sinx=1/3 and 0 < or equal to sin greater than or equal to pie/2 How would I find x? I now how to...

Homework Statement IN * ((4x^5 - x -1)(square root x-7)) / (x^2 + 1)^3 The Attempt at a Solution in(4x^5 - x - 1) + in(square root x-7) - in(x^2 + 1)^3 in(4x^5 - x - 1) + 1/2in(x-7) - 3in(x^2 +1) 5in4x - inx - 1 + 1/2(inx -in7) - 3 (2inx + in) I know...

thank you very much aaron you really helped me out with future problems. Our teacher said only 25% of students pass this class out of 24. Here is my next one I tried to work ((-4/x+h) + (-4/x) ) / h I remember something called ltw, where if you had addition in the denominator you multipled...

let me try now attain common denominator so multiply other side by 2(x+3) so we get -5x/2(x+3)(square root x+3) + 10(x+3)/2(x+3)(square root x+3) simplify 10x+30 since they are know common denominators do the addition 5x + 30 / 2x+6(square root...

I am having problems understanding this. Could someone explain how to arrive at the answer for this problem . (-5/2)(x)(x+3)^(-3/2) + (5)(x+3)^(-1/2) Thank you It says to factor and simplify. Express the answer as a fraction without negative exponents.This is where I get to...