Table Of Physical Constants

Name Symbol Value Unit Number $\pi$ $\pi$ 3.14159265358979323846 Number e e 2.71828182845904523536 Euler’s constant $\gamma$ $\begin{aligned} \gamma &= \lim\limits_{n\rightarrow\infty}\left(\sum\limits_{k=1}^n 1/k-\ln(n)\right) \\ &= 0.5772156649 \end{aligned}$ Elementary charge $e$ $1.60217733\cdot10^{-19}$ C Gravitational constant $G,\kappa$ $6.67259\cdot10^{-11}$ m$^3$kg$^{-1}$s$^{-2}$ Fine-structure constant $\alpha=\frac{e^{2}}{2hc\epsilon_0}$ $\approx \frac{1}{137}$ Speed of light in vacuum $c$ $2.99792458\cdot10^8$ m/s (def) Permittivity of the vacuum $\varepsilon_0$ $8.854187\cdot10^{-12}$ F/m Permeability of the vacuum $\mu_0$ …

Read moreTable Of Physical Constants

Practice MCQs For Speed, Velocity & Acceleration

This quiz contains practice questions for Speed, Velocity & Acceleration (O Level). There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish …

Read morePractice MCQs For Speed, Velocity & Acceleration

Thermal Physics For O Level

This topic covers “Thermal Physics” of O Level Physics. (Equivalent to American high school diploma) If this is too basic for you, you can try the more advanced version here. Thermal Physics for O Level is split into several sub-topics. There is a quiz for Thermal Physics which is located here. Measurement Of Temperature: Thermometry Thermometric properties Defining a temperature scale …

Read moreThermal Physics For O Level

Education? Do I Need It?

This post is aimed at clearing some of the misconceptions about the alleged benefits of rejecting a proper education.   From the article on dealing with exam stress, we have: $$\begin{aligned} \text{Education} \, &= \text{Exams} \\ \text{Exams} \, &= \text{Stress} \\ \text{Education} &= \text{Stress}? \end{aligned}$$ Since $\text{Stress} = \text{Bad}$, we have $\text{Education} = \text{Bad}$? We tend to get rid of …

Read moreEducation? Do I Need It?

How to Deal With Exam Stress?

This post is about helping you deal with study stress. The methods might work for you or it might not. Everyone is different. You will just have to find and personalize your own methods for coping with stress. Studying is a stressful activity. Whether you are a high school student or you are pursuing a career in the medical profession, …

Read moreHow to Deal With Exam Stress?

UY1: Rotational Kinematics

We will do a short derivation for the kinematics equations for rotations when the instantaneous angular acceleration, $\alpha$ is constant. $$\begin{aligned} \alpha \, &= \frac{d \omega}{dt} = \text{const} \\ d \omega \, &= \alpha \, dt \\ \int\limits_{\omega_{0}}^{\omega} \, d \omega \, &= \int\limits_{0}^{t} \alpha \, dt’ \\ \omega \, &= \omega_{0} + \alpha t \end{aligned}$$ That is the first …

Read moreUY1: Rotational Kinematics

UY1: Magnetic Field & Motion Of Charged Particles In Magnetic Fields

Magnetic Field In the presence of a magnetic field $\vec{B}$ (a vector field), a moving charge q experiences a magnetic force $\vec{F}$. Note: $F \propto q$, $F \propto B$, $F \propto v$ The magnetic force $\vec{F}$ is always perpendicular to both $\vec{B}$ and $\vec{v}$. The magnetic force on a charge q moving with velocity $\vec{v}$ in a magnetic field $\vec{B}$ …

Read moreUY1: Magnetic Field & Motion Of Charged Particles In Magnetic Fields