Question

A weighed diving brick is used to train swimmers to recover objects from underwater. The diving brick in this problem is 203mm long by 92 mm wide by 57 mm tall and weights 4.5 kg. (a) Calculate the density of the brick (b) Assuming that there is no water under the brick, calculate apparent weight of the brick when it sits on the bottom on of a 2m deep swimming pool. Hint: you might want to start with a free body diagram. (c) Once the brick is removed from the bottom of the how much force is required to prevent it from sinking back the bottom of the pool? Assume the brick remains fully submerged. (d) Why is the difference between these forces so big?

Answer 1