DrOfEng

This AP Computer Science A video explains how the System Class Methods in Java can be used to output text. Post your comments/questions below and please subscribe.

This AP Chemistry video explains how the unit of mole connects other units in Chemistry. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video illustrates how limits can be estimated numerically from tables. This video is part of Unit 1 of AP Calculus AB/BC on Limits and Continuity. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video defines instantaneous speed and instantaneous velocity. This video is part of Unit 1 of AP Physics C (Mechanics) on Kinematics. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video explains three types of programming errors that are typically encountered. Post your comments/questions below and please subscribe.

This AP Chemistry video defines the unit of mole using Avogadro's number, which is used to connect the mass of a substance to the number of its particles. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video illustrates how limits can be estimated from graphs, and several examples of cases where the limit does not exist. This video is part of Unit 1 of AP Calculus AB/BC on Limits and Continuity. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video defines average speed and average velocity, and explains the difference between them. This video is part of Unit 1 of AP Physics C (Mechanics) on Kinematics. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video explains the process by which a Java program is compiled and executed using a simple flowchart. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the notation used in the periodic table, and the structure of atoms and isotopes. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video provides a loose definition for a limit. The epsilon-delta definition or the precise definition of a limit will be covered in future videos. This video is part of Unit 1 of AP Calculus AB/BC on Limits and Continuity. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video defines displacement and distance and explains the difference between them. This video is part of Unit 1 of AP Physics C (Mechanics) on Kinematics. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video provides an introduction to computer science, and covers Java programming basics/style and the basic features of an Integrated Development Environment (IDE). Post your comments/questions below and please subscribe.

This video provides an introduction to chemistry, and covers some important features of the periodic table. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This video provides an introduction to Calculus while briefly explaining how a limit can define the instantaneous rate of change from the average rate of change. This video is part of Unit 1 of AP Calculus BC on Limits and Continuity. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This video describes vectors in one dimension, and compared vectors Vs scalars. This video is part of Unit 1 of AP Physics C (Mechanics) on Kinematics. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This Discrete Mathematics video derives the Big O of the Binary Search algorithm using recurrence relations. Post your comments/questions below and please subscribe.

This Discrete Mathematics video derives the Big O of the Binary Search algorithm. Post your comments/questions below and please subscribe.

This Discrete Mathematics video derives the Big O of the Merge Sort algorithm. Post your comments/questions below and please subscribe.

This Discrete Mathematics video explains how to determine the order of the Bubble Sort algorithm by deriving the recurrence relation. Post your comments/questions below and please subscribe.

This Discrete Mathematics video explains how to determine the order of the Bubble Sort algorithm. Post your comments/questions below and please subscribe.

This Discrete Mathematics video covers a worked example on the refined Big O calculation. Post your comments/questions below and please subscribe.

This Discrete Mathematics video explains a Big O calculation that is more refined for algorithms i.e. positive function and large N. Post your comments/questions below and please subscribe.

This Discrete Mathematics video explains how to predict the order of a function using Big O and better constants, drawing an analogy to predicting the growth of algorithms. Post your comments/questions below and please subscribe.

This Discrete Mathematics video explains how the triangle inequality can be used to determine the order of a function using a worked example. Post your comments/questions below and please subscribe.