Recent content by lehel

Well, its more for my own interest of understanding entropy. I was trying to figure out if the the energy that can't be used as work was somehow related to the number of microstates or something like that and if so, how.

Hello, I've been recently learning thermodynamics and have some questions about entropy. First off, I understand that it is a statistical measure of disorder and uncertainty and understand the 2nd and 3rd laws fairly well. My question pertains more to Gibb's Free Energy. As I've learned...

yet, how can you get around this when all physical models themselves are constructions from the analytical mind? yes there are many 'views' as you say, but i guess the first real question is if time actually exists outside human consciousness. is the idea that time is the thing that "keeps...

I'm currently taking a Psychology of Consciousness course and this is the exact topic I've been wondering about. What is the present moment? In Special Relativity, 'now' theoretically depends on the reference point (without getting into hypotheticals involving quantum entanglement)...

i found out what i was missing: an equation describing the relationship between the acceleration of the weight and the acceleration of the yo-yo. a-weight = a-yo-yo - R*alpha.

Homework Statement a 16lb yo-yo is resting on a horizontal table and is free to roll. The dimensions are r = 4in and R = 12in and the radius of gyration about the CM is 6in. A cord is wrapped around the inner radius, the passes over a perfect pulley, and is attached to a 8lb block. Find...

actually, i think i realized that solving the problem involves just the free body diagram of the spoke. the axle applies a force with unknown vertical component V and horizontal H the net force on the vertical for the spoke becomes something like: (10/32 slugs)(a-cm) = 10lb - V where a-cm...

Homework Statement a wheel (hoop) of 10lbs has one 10lb spoke which is horizontal and rests on the ground (held). it is connected to an axle. the radius of the wheel (length of spoke) is 1ft. when the wheel is let go, what is the force of the axle on the wheel? (the problem also asked...

can you give an example of a vector function with a basic boundary condition commonly used?

wave equation -- vector notation what does the solution to the SE look like if expressed in vector notation? say if we just used phi as a function of x and t.

I have a problem in trying to express a net force equation for a falling elastic object when collision ensues. For instance, you drop a spring with a spring coefficient k. the spring compresses a distance x after a time t for a maximum time of tf and distance xf. the spring has a weight W...

well, in the solution manual, the way they solved for the sheer forces was by taking the segment AC by itself, and then saying that there are two forces on the joints going straight up: net forces on y for strut = SheerForce1 + SheerForce2 - Weight. and then solved for one sheer force using a...

so, i take it for pin-jointed trusses, the trick to solving is if the weight is directly over a pin joint, just leave the force there. but if the weight acts in between joints, you resolve the force into sheer forces on the the adjacent pins and use a net-torque equation to to calculate those...

here are two problems I'm talking about. would solving for all the forces in both of them require extra steps in 69?

I have a general question about solving these types of problems. I had two different problems for calculating the tensions and compressions of a pin-jointed truss. both problems were of a trapezoidal shape with 5 pins in total. in one problem, a weight was applied to the center truss on...