# Physics Tutorials

### A New Interpretation of Dr. Walter Lewin's Paradox

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Much has lately been said regarding this paradox which first…

### Calculating the Spin of Black Hole Sagittarius A*

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This Insight takes a look at how it is possible to calculate…

### Solving Einstein's Field Equations in Maxima

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A few months ago, pervect pointed me to a post by Chris Hillman…

### Rindler Motion in Special Relativity: Rindler Coordinates

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Our destination In our last article, Hyperbolic Trajectories,…

### Rindler Motion in Special Relativity: Hyperbolic Trajectories

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Introduction: Why Rindler Motion? When students learn relativity,…

### Statistical Mechanics: Equilibrium Systems

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This is the first of a multi-part series of articles intended…

### The Homopolar Generator: An Analytical Example

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Introduction It is surprising that the homopolar generator,…

### An Integral Result from Parseval's Theorem

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Introduction: In this Insight article,  Parseval's theorem…

### Relativity Using the Bondi K-calculus

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Although Special Relativity was formulated by Einstein (1905),…

### Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity

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Traditional presentations of special relativity place emphasis…

### Frames of Reference: Linear Acceleration View

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My previous Insight, Frames of Reference: A Skateboarder's View,…

### Fabry-Perot and Michelson Interferometry: A Fundamental Approach

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Fabry-Perot Effect: The Fabry-Perot effect is usually treated…

### The Schwarzschild Geometry: Physically Reasonable?

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In the last article, we looked at various counterintuitive…

### The Schwarzschild Geometry: Coordinates

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At the end of part 1, we looked at the form the…

### The Schwarzschild Geometry: Key Properties

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Not long after Einstein published his Field Equation,…

### Explaining How Rolling Motion Works

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Although rolling wheels are everywhere, when most people are…

### Grandpa Chet's Entropy Recipe

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How do you determine the change in entropy for a closed system…

### Orbital Precession in the Schwarzschild and Kerr Metrics

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The Schwarzschild Metric A Lagrangian that can be used to describe…

### Precession in Special and General Relativity

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The Absolute Derivative In relativity we typically deal with…

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A spacetime is often described in terms of a tetrad field, that…

### Relativity on Rotated Graph Paper

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This Insight is a follow up to my earlier tutorial Insight (Spacetime…

### Basic Kinematics in Classical Mechanics

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There is an interesting thing in teaching of Classical Mechanics.…

### Presenting a Rare Kinematic Formula

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Here we present some useful kinematic fact which is uncommon…

### Elementary Construction of the Angular Velocity

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Physics books  seldom contain accurate definition of the angular…

### Frequently Made Errors in Vectors - Elementary Use

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A vector has magnitude and direction. Pictorially,…

### LightCone7 Tutorial Part III - How Things are Computed

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In Part I and Part II of this mini-series, we have briefly discussed…

### LightCone7Combo Tutorial Part II - Charts

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Part I dealt with the basic user interface of LightCone7Combo.…

### LightCone7Combo Tutorial Part I

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LightCone 7 Combo is a versatile tabulating/charting cosmological…

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### A Short Proof of Birkhoff's Theorem

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Birkhoff's theorem is a very useful result in General Relativity,…

### Frequently Made Errors in Heat: Elementary Level

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1. Heat, Work, Internal Energy and Kinetic Energy "If heat is…

### Frequently Made Errors: Pseudo and Resultant Forces

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1. Real versus Fictitious Pseudo, or "fictitious",…

### Why Renormalisation Needs a Cutoff

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This is a follow on from my paper explaining renormalisation.…

### Frequently Made Errors in Mechanics: Springs

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1. Springs in Series "A spring of constant $k_1$…

### Frequently Made Errors in Mechanics: Momentum and Impacts

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An impact is an impulse (change of momentum)…

### Frequently Made Errors in Mechanics: Hydrostatics

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1. Archimedes' Principle X "When a body is placed…

### A Partial "Derivation" of Gauss's Law

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Gauss's law was formulated by Carl Friedrich Gauss in 1835. It…

### Frequently Made Errors in Equation Handling

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1. Algebra versus Arithmetic When numerical values…

### Frequently Made Errors in Mechanics: Kinematics

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Kinematics is the subset of dynamics…