After the collision, car 1 has a final velocity of 6m/s south. What is the final velocity of car2? a) 35m/s north
b) 35m/s south
c) 81 m/s north
d) 81 m/s south

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

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

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?