True or false: Both generators and electromagnets involve ELECTRICITY in some way.

What happens to light waves from a star as the star moves away from earth?

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?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance