DrOfEng

This AP Calculus AB/BC video explains how to find vertical asymptotes using infinite limits. 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 explains Newton's second law of motion, forces and free body diagrams. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A explains the main methods of the Java String class, most of which are listed in the Java Quick Reference (https://apstudents.collegeboard.org/ap/pdf/ap-computer-science-a-java-quick-reference_0.pdf). Post your comments/questions below and please subscribe.

This AP Chemistry video explains Aufbau's rule, Pauli's exclusion principle and Hund's rule for determining the electron configuration of an atom. 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 practice problem on how to identify and remove discontinuities. 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 demonstrates how to represent vectors in different coordinate systems, and how physical quantities retain their properties in different coordinate systems. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A explains how to read Java documentation using the String class as an example. https://docs.oracle.com/javase/8/docs/api/java/lang/String.html Post your comments/questions below and please subscribe.

This AP Chemistry video explains the shapes of s and p orbitals, which are obtained from quantum mechanics. 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 Caluclus AB/BC video explains how to identify and remove removable discontinuities. 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 explains vector addition and subtraction using the parallelogram and head-to-tail methods, scaling vectors, and the commutativity of vector addition and subtraction. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A explains how string objects are created and stored in computer memory, direct and dynamic initialision, concatentation and literals. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the types of shells, subshells and orbitals present in an atom at different energy levels. 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 covers worked examples on detemining the intervals over which a function is continuous. 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 covers worked examples on projectile motion in 2D. 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 explains non-void methods and their return values. Post your comments/questions below and please subscribe.

This AP Chemistry video explains Coulomb's law and the forces between charges in an atom using the simplified Bohr model. 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 explains how to confirm the continuity of a function over an interval. 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 derives the big five kinematic equations for projectile motion in 2D. 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 explains how void methods with parameters are defined and called, and their properties. Function overloading is also covered. Post your comments/questions below and please subscribe.

This AP Chemistry video covers worked examples on the composition of mixtures. 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 covers worked examples on determining if a function is continuous at a point. 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 covers a worked example on a kinematics problem that involves uniform acceleration in 1D. 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 explains how void methods are defined and called, and their properties. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the composition of mixtures and formula units using several examples. 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 explains three conditions that must be satisfied for a function to be continuous at a point. 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.