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Problem sets on velocity, acceleration and free fall.

Problem sets on pH, pOH and acid-base calculations.

Problem sets on Ohms law and series and parallel circuits.

Problem sets on Boyle, Charles and ideal gas law.

Problem sets on force, mass, acceleration and friction.

Problem sets that use balanced equations for mole and mass calculations.

Reference answering questions on calendar rules, week numbers and Easter dates.

Makes printable calendars with holidays for any year.

Printable calendars and date tools such as week numbers and day counts.

Reference on the history and rules of the worlds calendar systems.

Lunar calendar showing Chinese dates, festivals and auspicious days.

Pick a root and chord type to see the chord on a staff and keyboard, with notes and inversions.

Color-coded guide to chords with interactive examples that visualize chord structures.

Interactive visual guide to scales as subsets of the twelve chromatic pitches.

Draw shapes and lines and hear them as music, inspired by the painter's relation of sound and color.

Formats citations in APA, MLA, Chicago, Turabian and Harvard.

Formats APA citations from source details you enter.

Produces BibTeX entries from source details.

Formats Chicago-style citations from source details you enter.

Formats Harvard references from source details you enter.

Formats IEEE references from source details you enter.

Formats MLA citations from source details you enter.

Formats Turabian citations from source details you enter.