After arriving at a solution, ask if it makes physical sense. For instance, a calculated velocity should not exceed the speed of light, and pressure should not be negative in standard conditions. Where to Find Solutions
The Hubble law suggests a privileged center. Physical Resolution: Homogeneity and isotropy (Cosmological Principle). physics galaxy discussion questions solutions
$$ \vecE = -\nabla V $$
The concept of inertia is central to Newton's First Law of Motion. An object's inertia determines its resistance to changes in its motion. For example, a bowling ball has more inertia than a tennis ball, making it harder to change its motion. After arriving at a solution, ask if it makes physical sense