Force exerted on the pivotal pin of an oscillating object.
If you have a rod oscillating back and forth by a frictionless pivot point near the end of one side of the rod and the only external force is gravity, how would the magnitude and direction of the force...
View ArticleGood Rotational Mechanics Resource for AP Physics C
Hey, I've been struggling a little with rotational mechanics in my AP physics, any ideas for good resources to help? Thanks a lot in advance.
View Article2 Reactions of 2 objects are not at equilibrium
Why are the reactions from two objects not at equilibrium ?
View ArticleWork against gravity
I'm figuring that this has been asked before, but I couldn't locate a previous thread. Here's my problem: A 1.0 kg ball is lifted at a constant speed to a height of 1.0 meter above the ground. The work...
View ArticlePrinciple of moments
This has botherd me for quite sometime ......imagine a beam or a simple scale supported at its centre and carrying equal weights on two extreme positions on the scale from the centre, now under...
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Apollo Spacecraft Re-entry Program
I'm working on an Apollo re-entry program and would like to somehow check my results I got for re-entry. I'm using 3 DOF equations to calculate the trajectory of the spacecraft. Equations of motion:...
View ArticleHow to get mean occupation numbers by Grand partition function?
How to calculate [itex]<n_i ^2>[/itex] for an ideal gas by the grand partition function ([itex]<n_i>[/itex] is the occupation number)? In other words, I like to know how do we get to the...
View ArticleWaves Boundary Behaviour
Hi, please could someone help clarify the reason why a mechanical wave is inverted at a boundary as I'm really stuck! Some sources I have read seem to suggest it can be explained by Newton's 3rd law...
View ArticleA question in Electrostatics
the question is about the uniqueness theorem (right now I am reading in griffiths book). the first uniqueness theorem state's that "the solution to laplace's equation in some volume is uniquely...
View ArticleRotational speed due to gravitational pull in earth's orbits
Hi All, Assume we have a package that we want it in an orbit with highest possible speed. In which orbit (low,mid,high) the package will rotate faster ? Due to smaller distance, low earth orbit should...
View ArticleSatellite Motion conceptual problem
Hey Dear forum, I know I'm wrong, but I don't know why: Since the Earth's descends 5 meters for every 8km, a horizontal speed of 8km/sec will put an object to rotate around the Earth (neglecting air...
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Motion of mass constrained to rail
I have a classical mechanics problem related to the constrained motion of a mass: as per the attached graphics, assume a thin rigid rod of length L and mass m moving frictionless constrained to a rail...
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Fiberooptic Laser Doppler Velocimeter
Hi, I have problem understanding some things about this particular LDV system(a Laser Dopler velocimeter). Source is a light source - laser. On the right there is a flow seeded with particles that...
View ArticleViscosity and pressure relation
i know the relation between these two. with increase in pressure, the viscosity of liquids (expect water] increases while that of gases is practically independent of pressure. The viscosity of water...
View ArticleCharge density of some potentials
Suppose that we have the potential [itex]V=\frac{exp(-\lambda r)}{r}[/itex] that [itex]\lambda[/itex] is a constant. To calculate the charge density we have to calculate the [itex]\nabla^2V[/itex]. We...
View ArticleInclined Plane
This is driving me nuts. What am I missing? Suppose you have an inclined plane with a mass m resting on it. The free body diagram for the mass m has F_grav downward and F_normal perpendicular to the...
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Lagrangian Derivation
I have been reading Lagrangian from Classical Mechanics by John R. Taylor. I have adoubt in a derivation which invloves differential calculus. I have attached snapshot of the equation , can someone...
View ArticleDiffraction through circular apertures
Hi all, This is probably an error resulting from my qualitative understanding of diffraction, but in most basic descriptions of the phenomena they talk about diffraction occurring when light encounters...
View ArticleInertia? what is its origin
Hi, so i have a fairly good understanding of most of the concepts relating to inertia. but my question is what is the force felt by the observer while accelerating. for example the force gravity can be...
View ArticleThe classical free electron photon emission and absorption.
Hello. I'm wondering about the Gaunt factor. I'm currently interesting in the spectroscopy in which the Gaunt factor is the correction factor to the classical cross section associated to the photon...
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