Are all forms of radiation safe for humans?

Arescue plane flying horizontally at spots a survivor in the ocean directly below and releases an emergency kit with a parachute. because of the shape of the parachute, it experiences insignificant horizontal air resistance. if the kit descends with a constant vertical acceleration of, how far away from the survivor will it hit the waves?

Phase changes are chemical changes. true or false

Why do astronauts in the space shuttle weigh less?