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Am I tripping right now?

Classical Mechanics Level 1

A recent viral video depicts a young woman's hair changes back and forth when she enters different room.

Explain this phenomenon.

She is a unicorn The dress is white and gold She is a teenage witch Our perception of the color of objects depends on the the way light is reflected off their surfaces

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations,
examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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by Pi Han Goh

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