What is the magnitude of the momentum of a 20 g sparrow flying with a speed of 8.1 m/s? kg·m/s?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Which articulations allow for greatest range of motion?

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?