Recent content by zeralda21

Homework Statement See picture : Homework Equations ##\sum M_{O}=I_{O}\ddot{\theta }## The Attempt at a Solution Consider the free-body diagram associated with an arbitrary positive angular displacement ##\theta##; The moment about point ##O## is given by ##\sum...

Theta is the angle between the spin axis and precession axis. Precession axis is the axis which the Earth precess about.

Homework Statement The Earth is slightly thicker around the equator and hence $I_{0}\neq I_{\zeta}$ I am curious in finding the angular velocity for the **precession** between using the fact that the distance between the spin axis and the precession axis is 10 meters on the surface of earth...

Alright. Did you read my attempt? Would like to know if I am all wrong or somehow correct. The FBD contains the two particles, each with a gravitational force ##mg## acting in negative ##x##. We have a parallel-plane motion with constant rotation in ##z-##axis, hence the moment equations...

Homework Statement The shaft carries two particles of mass m, and rotates about the z-axis with the constant angular velocity ##\omega##. Determine the x- and y-component of the bearing due to imbalance. The Attempt at a Solution Rotation only around the ##z-##axis so ##\omega _{x}=\omega...

Kinetic energy is lost in inelastic collisions. Does that help? Total energy is however conserved.

Yes, exactly. It could be wrong in the key, because I got ##I_{xx}## correct. I'll double check.

Homework Statement I'll provide picture for clearer understanding. The solid cylinder of mass ##m## and radius ##r## revolves about its geometric axis at an angular rate ##p## rad/s. Simultaneously, the bracket and shaft revolve about x-axis at the rate ##\omega## rad/s. Determine the angular...

I think that since it is not mentioned about any radius we can safely assume it to be zero. What distance? The perpendicular distance? Or using Phytagorean ? I think this is slighly better but still wrong.. For B: ##I_{zz}=\overline{I}_{zz}+md^2 = \frac{1}{3}(\rho b)(b^2)+(\rho...

Homework Statement I'll provide a picture for clearer understanding. The problem is to calculate the angular momentum of the rod rotating about the z-axis. I have serious difficulties in deriving the inertia matrix, that's all I need help with. Progress Since the rod is...

I am sorry. I thought slender and rod is the same thing. I mean a slender rod

Homework Statement I'll provide a picture for a clearer view: http://i.imgur.com/wkXPcJn.jpg Suppose that the slender rod starts at rest at theta = 0. For convenience we chose the datum at theta = 0. Now I want to calculate the gravitational potential energy at a later instant when theta =...

In general, it seems that every domain of let it be science/technology, both theoretical and experimental, relies more and more on computational science nowadays. How much computer science is required though? Equivalent to a Bsc? Ms? Or even more?

This is actually one reason to why I've looked into ways to become very efficient in your work and life in general. Because if one could shorten 8 hours a day to the equivalent to, say, 4-5 hours a day, then it is totally doable. I should probably open a new thread about it but as a question to...

Yeah, that's exactly the thing. If it reaches so far that one says "as long as you're getting up every few hours it should be ok", then you've already passed the limit. Unfortunately I don't see a solution to this dilemma. I think one probably needs to change career if health is priority. I was...