A snake slithers along the ground. Which force works against the snake's forward motion?

A. magnetism

B. friction

C. spring

D. gravity

With these questions , 15 pts & brainliest

What are similarities and differences of reflection, refraction, diffraction and absorption?

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?