An astronaut on planet X

Classical Mechanics Level 2

An astronaut lands on planet X which has \(\frac34\) the mass and \(\frac34\) the radius of Earth. On Earth the astronaut weighed \(900\ N\). How much does he weigh on planet X?

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An astronaut on planet X

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100 Day Summer Challenge

An astronaut on planet X

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.

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

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

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

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