Conservation Laws Fundamental Forces Estimation Of Distances

Conservation Laws:

• Law of Conservation of Mass:
  • Matter cannot be created or destroyed during a reaction, but can change form.
• Law of Conservation of Energy:
  • The total amount of energy in an isolated system remains the same.
• Law of Conservation of Momentum:
  • The total momentum of an isolated system remains constant.
• Law of Conservation of Angular Momentum:
  • The total angular momentum of an isolated system remains the same.

Fundamental Forces:

• Gravitational Force:
  • An attractive force between any two objects with mass.
• Electromagnetic Force:
  • A force acting between charged particles, stronger between oppositely charged particles.
• Strong Nuclear Force:
  • A force binding the subatomic particles (quark) in atomic nuclei.
• Weak Nuclear Force:
  • A force behind the radioactive decay of some subatomic particles.

Estimation of Distances:

• Parallax Method:
  • Determining the distance to a star by observing its position from different points.
• Triangulation Method:
  • Using angles from two known positions to calculate the distance to an object.
• Radar Method:
  • Measuring the time taken for a radar pulse to bounce back from an object.
• Echo Method:
  • Measuring the time it takes for a sound echo to return, thus estimating distance to objects from sound waves.
• Spectroscopic Method:
  • Measuring the spectrum of stars to approximate the distance based on its redshift or blueshift.