Please help me i need help (wrong answers get reposted)

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

The heliocentric and the geocentric models of the solar system included these central principles

Select all the correct answers. which three statements about electromagnetic radiation are true?