-aquarium activity- small hollow ball in water- When you submerged 1/4 of the ball, did you have to exert a force downward ?

A spring is attached to the bottom of an empty swimming pool, with the axis of the spring oriented vertically. An 25.0-kg hollow block of wood (p = 840 kg/m³) is fixed to the top of the spring and compresses it. Then the pool is filled with water, completely covering the block. The spring is now observed to be stretched twice as much as it had been compressed. Determine the percentage of the block's total volume that is hollow. Ignore any air in the hollow space. Number i Units In air X 2x www Submerged in water --Unstrained length

Hello, I need help with this problem.

•35 Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30 m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the den- sity of the logs to be 800 kg/m?.

-aquarium activity- small hollow ball in water- As you submerged the ball more and more, how did your hand force change?

If you have a rectangular bottle (such as the one pictured) how can you place it on a surface so that it exerts the most pressure on that surface? Why does placing it this way exert the most pressure?