Recent content by Antepolleo

It's electromagnetics time again. I'm horribly stuck on a homework problem. It has to do with mutual inductance, and I know how the problem works conceptually, but I'm having a difficult time with the mathematics. The problem:A very long (read: infinite) wire is a distance d from the center of a...

You might find it interesting to look up the San people from Africa. They are one of the oldest known Homo sapien races and have many features that are commonly associated with different races today. For example, they have a medium skin tone and the same eye shape as Orientals (with extra skin...

If the height, width, and depth are all 5 times greater than I know that the volume would be 125 times greater but how do I relate that to the surface area?

I am having dificulty with this homework problem. It doesn't seem to give me enough information. I am asked to find the volume and surface area of an object of unknown volume and shape. Here is the problem: A sculptor builds a model for a statue of a terrapin to replace Testudo (go UMD!)...

Please help me wrap my head around this concept... I don't really need help on a problem in particular. If we define electric potential V to be zero at r = infinity for a point charge, how can we determine the potential difference of a test charge that moves from infinity to a specific point...

Hmm.. I tried an approach where I let the number of moles of the gas be constant, but it got me nowhere.

Here's the problem: 4. A diving bell in the shape of a cylinder with a height of 2.10 m is closed at the upper end and open at the lower end. The bell is lowered from air into sea water ( p = 1.025 g/cm3). The air in the bell is initially at 16.0°C. The bell is lowered to a depth (measured...

Incest increases chances of deformity because harmful recessive genes are more likely to be passed to offspring. This is true in humans and any animal. With interbreeding you get a lot of genetic diversity, which limits the effects of the bad genes.

That would be v_{esc} = \sqrt_{\frac{2GM}{R}} which I believe is about 2.2469 x 109. How would I relate this to the answer? I'm afraid I can't see the connection.

Ok, here's the problem: Neutron stars are extremely dense objects that are formed from the remnants of supernova explosions. Many rotate very rapidly. Suppose that the mass of a certain spherical neutron star is twice the mass of the Sun and its radius is 5.0 km. Determine the greatest...

Heh, it was a decimial problem. Thanks for pointing that out. If only all of these problems would be so simple!

These questions were in the "Universal Gravitation" chapter. It's got to have something to do with either Kepler's laws, or the law of universal gravitation.

I'm having a little bit of a problem with this one. Here's the question: X-ray pulses from Cygnus X-1, a celestial x-ray source, have been recorded during high-altitude rocket flights. The signals can be interpreted as originating when a blob of ionized matter orbits a black hole with a...

As you probably know, the parallel axis theorem states the following: I = I_{cm} + MD^2 Icm is the moment of inertia when the rotation axis goes through the objects center of mass... you already know that. M is the mass of the disk, you know that too. D is the distance of the axis...

Heh, I messed up a bit in my though process... you're right. Here's the second part of the problem: When the counterweight has a speed v, the pulley has an angular speed ω = v/R. Determine the total angular momentum of the system about O. Now that we've changed my concept of what...