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We can use the constant of proportionality between the arc length and the radius of a sector as a way to describe an angle measure, because all sectors with the same angle measure are similar.
On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells).
Learn about curvature and how to differentiate vector-valued functions on Khan Academy.
Course: Physics archive > Unit 4. Lesson 1: Circular motion and centripetal acceleration. Race cars with constant speed around curve. Visual understanding of centripetal acceleration formula. What is centripetal acceleration? Optimal turns at Indianapolis Motor Speedway with JR Hildebrand.
Course: Digital SAT Math > Unit 5. Lesson 6: Circle equations: foundations. Circle equations | Lesson. Circle equations — Basic example. Circle equations — Harder example.
The webpage explains Bohr's model of hydrogen atom in quantum physics.
Atomic Energy Levels. Electronic transitions. Bohr orbits: orbital radius and orbital speed. Bohr model: energy levels.
If we change the radius of a circle, how does the circumference and area change?
Angular motion variables. Distance or arc length from angular displacement. Angular velocity and speed. Radius comparison from velocity and angular velocity: Worked example.