Recent content by thename1000

I only have the explanation for linear homogeneous ones. I don't know how to do these: Give a recursive form (including bases) for the following functions: a. f(n) = 2 + (-1)^n b. f(n) = n(n+1) c. f(n) = 2n - 2 d. f(n) = n^2 – n e. f(n) = 3^n + n⋅3^n If someone could explain one or...

Oh really its that specific? :( too bad

Set Theory and Predicate Calculus (12 points) Given: P ⊆ Q Q ⊆ (S ∩ T) S ⊆ (R ∪ T^c) x(sub)1 ∈ P Use predicate calculus to prove x(sub)1 ∈ R. Studying for a test but I don't have this worked out for me. I honestly don't even know where to start. I know what union, intersect, etc and...

I'm given the initial conditions vnot=0m/s, hnot=3000m, and tnot=0s After 35 seconds of freefall, the chute opens. I am to write a piece-wise define diff equation for the rate of change of velocity, with the two pieces t<35 and t >_35. I am not given a mass. Now, I understand how to...

BUMP. Nobody knows how to do this? Help if you can :)

I only have one example that I can find, and that's finding the diameter of a copper atom. Do most elements follow these steps? 1.) Make sure density is in kg/m^3 2.) find number of copper atoms in a 1 meter by 1 meter cube. 3.) find number of atoms in one edge(row?) of said cube. 4.)...

Hey Galadirith, thanks for the response. I know the answer for #1, but not how to do it, do you think you could walk me through how to do that one? Do I need to integrate to find K, or can I just do W=k*amnt stretched. Thanks!

Homework Statement For example: 1.) A spring has natural length 1 m. A force of 24 N stretches it to a length of 1.8 m. How much work is required to stretch the spring 2 meters beyond its natural length? (ans 60 J) 2.) Suppose that 2J of work is needed to strech a spring from its...

Yes, I see what you're saying, sorry. I gave the second to the last line as an example of how I don't fully understand the process. To take the derivative or second derivative of the function do I sub something for sqrt(k/m)? sin(u*t) + 2cos(u)*t Like that?

uhhh...thanks? Since somebody answered I won't get a real answer now. :(

Homework Statement Trying to go over this part of my test review. I'm not understanding how to do this. The specific problem which I actually have worked out in my notes: A diff equation model of the motion of a spring where x is displacement from the spring's natural length, k is the...

Studying for a test and I can't really grasp a full example problem. I would also like help on a couple further example problems that are not done for me. Homework Statement Find the exact coordinates of the centriod: a. y=4-x^2, y=0 b. 3x+2y=6, y=0, x=0 c. y=e^x, y=0, x=0, x=1 d...

I'm studying for a test and it would be great if i could get step by step how to do this problem: a.) Find the average value of the function on the interval x=1 to x=10 for f(x)=3/(1+x)^2 b.) A uniform cable hanging over the edge of a tall building is 40 ft long and weighs 50 lb. How much...

The density of mobile electrons in copper metal is 8.4 1028 m-3. Suppose that i = 7.5 1018 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 1.7 mm. In this case, about how many minutes would it take for a single electron...

A long current-carrying wire, oriented North-South, lies on a table (it is connected to batteries which are not shown). A compass lies on top of the wire, with the compass needle about 3 mm above the wire. With the current running, the compass deflects 12 degrees to the West. At this location...