What is the net force when forces applied are 300 N to the right and 100 N to the right

In what direction does the medium move relative to the direction of the wave? explain.

What object a collides with object b and bounces back its final momentum is?

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?