Recent content by mikesown

Hmm, I'm still not completely understanding how to set up the problem. Here's what I'm understanding: There are two forces acting on the person, the force of gravity(mg), and the centripetal force acting as he slides down. I am still not understanding how to formalize this into mathematics. How...

Homework Statement "A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8m. He begins to slide down the ice, with a negligible initial speed. Approximate the ice as being frictionless. At what height does the boy loose contact with the ice?" Homework...

This is a multi-question homework which I want to see if I understand fully. I have attempted as much as I can of it, and would appreciate it if members here could tell me if my answers are correct and if not could guide me in the direction. Thanks in advance. 1. Balance the following reaction...

I'm very confused with an electrochemistry lab. For the lab, we used Al+3, Cu+2, Fe+3, Zn+2, and KNO3. The setup was wells with all of the solutions in them. We soaked a piece of paper(filter paper) in KNO3 for the reactions, then used the paper as a salt bridge between the solutions of the...

I'm very confused with an electrochemistry lab. For the lab, we used Al+3, Cu+2, Fe+3, Zn+2, and KNO3. The setup was wells with all of the solutions in them. We soaked a piece of paper(filter paper) in KNO3 for the reactions, then used the paper as a salt bridge between the solutions of the...

Can you elaborate more on that? I'm not quite sure what you mean.

Homework Statement "Find a horizontal line y=k that divides the area between y=x^2 and y=9 into two parts" Homework Equations The Attempt at a Solution Found intersection at (-3,9), (3,9) Found total area to be 36, half(the area needed for each portion) to be 18. Don't know where...

Wouldn't the moles of OH- be .0005 * .2 because the .5 is in mililiters?

I'm trying to do this homework problem, and I really am confused about how to do it. I'm familiar with dissociation of weak acids/bases, but I'm pretty confused with this problem(with a strong base and strong acid). The problem is: "40.0ml of 0.20M HCl is mixed with 40.5ml of 0.20M NaOH. a)...

"Tarzan" problem Homework Statement "Tarzan (m=85kg) tries to cross a river by swinging from a 10.0m long vine. His speed at the bottom of the swing, just as he clears the water, is 8.0 m/s. Tarzan doesn't know that the vine has a breaking strength of 1.0 x 10^3 N Does he make it safely...

I tried to solve for t and got the following: \frac{x}{\cos35\,^{\circ}v_{i}} and \frac{y}{\sin35 v_{i}+\frac{1}{2}*-9.81t}-1} What do I do now?

Thanks for your help with the equations. I know that a is supposed to be -9.81 but just goofed up ;). How would I go about finding the inital speed of the ball though? Do I set 0=cos35vit? If so, then I still have 2 variables, vi and t. How do I get around this?

Ah, I think I see... I know the equation d=vit+1/2at^2... Would these two equations work: y=\sin35\,^{\circ}v_{i}t+\frac{1}{2}*9.81\frac{m}{s^2}(t)^2+1 x=\cos35\,^{\circ}v_{i}t

I need to know the inital speed of the ball. Also what is sen?

To be completely honest, no. My physics class(honors physics) didn't really cover interpreting functions. We worked purely from predetermined equations from the book.