ITEM 6: Find the total current and voltage from cells rated at 200mA and 6V if 2 groups of 4 cells are connected in series, and then those two groups are connected in parallel.

An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°c. the bubble rises to the surface, which is at a temperature of 20°c. take the temperature of the bubble’s air to be the same as that of the surrounding water. just as the bubble reaches the surface, what is its volume?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk, in meters?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k