Anatomy and Physiology 4 questions..

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

What occurs during a combustion reaction

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)