During an experiment water was heated in a container covered with a glass lid. the following observations were recorded.
observation 1: water droplets form on the inside of the glass lid.
observation 2: bubbles rise as the water starts boiling. based on the observation, justify the type of change (physical or chemical) that took place.

It is a physical change because it only changed states

physical, even though it is boiling but the droplets is still water, water when boil was still water

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation: