What is another name for light independent reactions?

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)