A planet orbits the sun in an elliptical path. What remains constant for the pla

Practice Questions

Q1
A planet orbits the sun in an elliptical path. What remains constant for the planet as it moves in its orbit?
  1. Kinetic energy
  2. Potential energy
  3. Angular momentum
  4. Total energy

Questions & Step-by-Step Solutions

A planet orbits the sun in an elliptical path. What remains constant for the planet as it moves in its orbit?
  • Step 1: Understand that a planet moves around the sun in a path that is not a perfect circle, but an ellipse.
  • Step 2: Learn about angular momentum, which is a measure of how much motion an object has while rotating around a point (in this case, the sun).
  • Step 3: Know that angular momentum depends on the planet's speed and how far it is from the sun.
  • Step 4: Realize that as the planet moves closer to the sun, it speeds up, and as it moves farther away, it slows down.
  • Step 5: Understand that even though the speed changes, the total angular momentum of the planet remains the same throughout its orbit.
  • Step 6: Conclude that the conservation of angular momentum means that the angular momentum does not change as the planet orbits the sun.
  • Conservation of Angular Momentum – In an elliptical orbit, a planet's angular momentum remains constant due to the conservation laws of physics, meaning that the product of its mass, velocity, and distance from the sun does not change.
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