Category: Physics

Mathematics of Circular Motion

Angular Displacement The angle which an object moves around a circle is called the angular displacement. This angle is usually expressed in radians. Hence, there are radians in one complete circle. The relationship between...

How a Capacitor Discharge

How does a capacitor work? When a capacitor is connected across a power source, it starts charging up as current flows in the circuit.   Initially when the capacitor has not stored any charge,...

Capacitance

What is a capacitor?   A capacitor is an electrical component that stores charge. It is usually made by having two parallel plates thinly separated by an insulating material. This material is also known...

Gravitation and Circular Motion

Why does a orbiting satellite not fall to the Earth? A common misconception among students is that orbiting satellites do not experience gravity. It is argued that since these satellites are not falling to...

Gravitation – Potential and Potential Energy

Gravitational Potential and Potential Energy Gravitational potential at a point is the amount of work needed to bring a unit mass from infinity to that point. Gravitational potential is defined to be negative since...

Gravitation – Force and Field Strength

Concept of a Gravitational Field and Force A gravitational field is a region in which a mass experiences a force. A mass, that is present inside a gravitational field experiences a gravitational force. This...

Work done in a Capacitor

Capacitor is an electrical component that stores charge. As charges are stored, potential energy in the capacitor also increases. In this post, I would like to explain how to calculate the energy stored in...

IGCSE Definitions

This document contains the common definitions that may be asked in the Cambridge IGCSE examinations. IGCSE Definitions

Radioactive Decay is Random

Radioactive decay is both random over space and time, and radioactive decay is spontaneous. Random Random over space means that given a large number of radioactive nuclei, it would be impossible to predict which nuclei would...

Ultrasound Calculations

The table provides the data for the acoustic impedance and absorption coefficients for muscle and bone. A parallel beam of ultrasound of intensity  enters the muscle of thickness 3.0 cm as shown. The ultrasound...