4. When an ice cube in a glass of water melts, does the water level in the glass rise or fall or remain unchanged? Explain your answer. What law guides
your answer?

1-10. need . physics. circular motion. 35 points

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?

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant