Recent content by therest

Okay, further attempts at a solution: Circumference=2*pi*r acentrip. =4pi2r / T2 = (circ)2 / T2 or maybe ac = v2 / r = (x2/t2) / r = t2 / x2r How do I work G=v2r / M into it and make a comprehensive equation out of the whole thing? Any ideas? EDIT: maybe if I set t2 / x2r = 4pi2 / T2 and...

gravitation lab for online simulation--equation derivation help? Homework Statement To start with, you can access the lab here: http://phet.colorado.edu/teacher_ideas/view-contribution.php?contribution_id=690" . I'm having trouble with the "Activity 4" part. It reads: "Change the number of...

WOW! You totally made everything conceptually clear and answered all my questions! Torque and angular stuff has always been difficult for me, so thanks so much for your help! It was an interesting problem ;)

Homework Statement this question is from 1980. 1980M3. A billiard ball has mass M, radius R, and moment of inertia about the center of mass I=2MR2/5. The ball is struck by a cue stick along a horizontal line through the ball's center of mass so that the ball initially slides with velocity v0...

Homework Statement Find net angular momentum for a soccer ball (moment of inertia=2/3mr^2) that's going 3.6 m/s to the right and 28.5 radians per second clockwise at the same time. R=0.142 m m=0.678 kg Homework Equations L=(perpendicular component of r)mv L=Iw The Attempt at a...

spherical shell rolls down a ramp with friction--time? Homework Statement A 120 g basketball has a 25.7 cm diameter and may be approximated as a thin spherical shell. Starting from rest, how long will it take a basketball to roll without slipping 6.29 m down an incline that makes an angle of...

Sigh. It's a bit embarrassing that I'm having so much difficulty with this. Sorry about that, thanks for your continued help. (M + m)g - T = (M + m)a T - Mg = Ma (M + m)g - Mg = (M + m)a + Ma Mg + mg - Mg = Ma + ma + Ma mg = 2Ma + ma mg - ma = 2Ma m (g - a) = 2Ma m = 2Ma / (g - a)Does that...

Sorry for the long gap in-between posts. I let this assignment slip away from me for a while. I tried again, following your advice: (M+m)g-T = (M+m)a T-Mg=ma added the two, and got (M+m)g-Mg=ma + (M+m)a (can I distribute this (M+m)a?) Mg+mg-Mg=ma+Ma+ma mg=2ma + Ma mg / 2(M+m) = a...

The elevator is not accelerating, it only has a velocity. You can find the height of the elevator using the equation for velocity: v=x/t. You are trying to find x; you have t and v. What do you have to do to find x? To find the speed of the bolt when it hits the ground, remember that...

Homework Statement A 32 kg cannon ball is fired from a cannon with muzzle speed of 1360 m/s at an angle of 44◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the total mechanical energy at the maximum height of the ball? Answer in units of J. Homework Equations...

wow, awesome! That actually makes sense! Mentallic and Bohrok, thank you so much! :smile: I ended up getting the same answers.

Wow, thank you! That makes complete sense. I think.

Hmm, or not. I think I'm stuck. Here's what I did: y=x4-2x2-x dy/dx=4x3-4x-1=m m=(y2-y1) / (x2-x1)=(by - ay) / (bx - ax) --> x + y subscripts are being used to denote the x and y coordinates of points a and b which share a tangent line. y=mx+c (c is the constant; I was already...

OH! Thank you so much Bohrok! I think I know exactly what to do from there. :)

Thanks Doc Al! I tried that and pretty much failed. I think my algebra is getting pretty bad of late, so I'm having some trouble with getting the tension and acceleration. I tried: a=(T-Mg)/M & a=(M + m)-T a+T=(M+m)g...