Recent content by PherricOxide

Okay, so my basic understanding of an NP junction (diode) is as follows. When no external voltage is applied, some of the electrons in the N type material jump over to the "holes" in the P type material. The holes then end up moving back into the P type material further, and you end up with...

I think the angle is actually correct, I just didn't know the weight acted on the center of mass. Torque = 135N * 1.2M * sin(125) Dividing that by the moment of inertia and them multiplying by the radius gave me the correct answer.

Velocity = Change in position / Change in time Change in time = Change in position / velocity I think you were doing velocity / change in position instead.

Homework Statement A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end. It starts out vertically from resting on a wall and falls, pivoting about the hinge. Just as it has rotated through an angle of 55 degrees, the acceleration of the end...

20-9.8*m = m*(-0.75) There we go, thanks guys. I'm still wondering why this was in the chapter with dynamics of rotational motion though.. I guess that's just a harder way to solve it.

The 1kg block will be gaining gravitational potential energy as it rises.

Yes, I'm trying to find the mass of the hanging object. For something starting at rest at y=0, y = (1/2)at^2 -1.5 = (1/2)*a*2^2 a = -0.75 From there, T - mg = -may 20 - m*9.8 = m*0.75 20 = m(0.75+9.8) m = 20/(0.75+9.8) m =~ 1.9kg. However, this still isn't the right answer...

Homework Statement A wheel has a radius of 0.40 m and is mounted on frictionless bearings. A block is suspended from a rope that is wound on the wheel and attached to it. The wheel is released from rest and the block descends 1.5 m in 2.00 s while the wheel rotates clockwise. The tension in...