Which processes in the water cycle could result in water entering the ocean?
a. infiltration or condensation
b. evaporation or transpiration
c. condensation or evaporation
d. precipitation or surface runoff

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)