Partition between kinetic and potential energy?
Hi, If I have a body which is freely vibrating with kinetic energy given by, say, Ekin=(1-1/10sin(ωt))cos2(ωt) what can be said about the potential energy? Of course the total energy should be constant...
View Articleclarification in the definition of force
\According to Newton's second law, force is defined as rate of change of momentum or force is defined as product of mass into acceleration, I both of these definitions are same and right. My questions...
View ArticleCompress a very hot plasma, change in electromagnetic energy?
Say I have a volume of hydrogen gas that is raised to a temperature T so that 99.9 percent of the gas is ionized. If now, with the plasma at some pressure P, the volume is compressed a small volume dV...
View ArticleHeat flow through metal cylinder?
Suppose I have a closed end aluminum pipe of 3cm diameter with .5cm walls Cylinder is 10cm tall , 8mm of which is submerged in a cold bath of approximately constant temperature of -10°c I feel it with...
View ArticleThe gravitational acceleration g
Suppose a particle of mass M is under gravitational attraction. The Newton's law of gravitation says that F=GMm/r^2, and the part Gm/r^2 is g (acceleration due to gravity how?)
View ArticleIsothermal Expansion and the 2nd Law
The book that I use (Concepts in Thermal Physics by S. and K. Blundell) states the second law in two ways. The way they state the Kelvin version is "no process is possible whose sole result is the...
View ArticleCenter of Mass Formula
Hello, I'm reading Mathematical Methods in the physical sciences by Mary Boas and in it, she defines the center of mass of a body in 3 dimensions [tex] \int \overline {x}dM=\int xdM [/tex] [tex] \int...
View ArticleForces on a hanging string
I thought about this when hanging my belt on to the towel holder. If i put too much of the belt on one side, that side would fall down. Why does this happen? Shouldn't the towel hanger just put up an...
View ArticleWhat liquid has ideal thermal properties for this project?
I want to circulate cold water through copper tubing curled in a spiral about a fan. I'll cool the water with a large block of ice that I can remove and replace like a battery. To avoid making a mess I...
View ArticleWhat's exactly the meaning of Linearization?
Hi all, I want to discuss about the assumptions in the linearization. By linearization, I mean the following classic procedure. (1) Original nonlinear governing equation is [itex]\frac{\partial...
View ArticleBasic question regarding dynamics concepts?
I just started Physics 1 this semester. Although the kinematics we covered so far were simple, our teacher didn't do a particularly good job at explaining dynamics. In fact, all 10 students I talked to...
View ArticleVariable MOI: Rotational 2nd Law
I'm having trouble finding any sources that discuss equations of motion that take into account a changing moment of inertia. Just looking at the scaler case, angular momentum is [itex]L =...
View Articlecapacitors: why is the dielectric constant defined the way it is?
usually when we have some initial variable U(0), and we have some factor K that changes this initial variable, we usually express the new variable U(f) like so.. U(f)=KU(0) and NOT the other way...
View ArticleRepulsive Charge Dynamics
Hi, I've been toying with a thought experiment, and I was wondering if it had any basis in reality. Is it possible to confine like-charged particles (e.g., primarily positive or primarily negative) to...
View ArticleAngular accerlation
I am having some problems understanding rotational motion in three dimensions. If a torque is applied to a rigid body that is already under rotation but τ-torque's direction is different from ω-angular...
View Articleuse of phasor representation in physics
Why do we use phasor representation in physics..For example,why we need maxwells equation in phasor form as well??
View ArticleDoes every light ray travels in all directions?!
Hi. I hope this is the right place to ask this and I hope it's not that much stupid. In school we have been told that the reason we see objects is rays of light reflected from that object received by...
View ArticleA stick in space
If there is a stick in space and you provide an impulse on one end of the stick, then will it rotate or will it simply undergo translational motion in a straight line? If you have the stick on earth on...
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Jet on a rigid link question...
I have a mass (m) at the end of a rigid link of length r, pivoted at the red circle (below). m is acted on by a force (F) which is always normal to the surface shown (thrust from a jet say). My...
View ArticleSynchronization of Charge Movement
I understand the the motion of charges in a particular direction constitutes a current, and from my understanding, the more charges you have flowing in the same direction, the stronger the current. Are...
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