Visible electrical discharge from a storm cloud is called?

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?

How do you tell if someone actually cares about you? and just say they do?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects