A hollow cylinder 2.53 m diameter and weighs 3819 newton. Lead weighing 115 kN/cu.m will be fastened onto the cylinder. how many cubic meters of lead must be fastened to the outside bottom of the cylinder to make it float with 1.63 meters submerged in water ?

please do not round off everything

Explain The major component of Menard’s prototype pressuremeter apparatus.

A lead weighing 110 kN/m³ is tied to the bottom of a 4 kN cylinder 1 m in diameter and 2 m high. (a) How many kN of lead that makes the cylinder float with water just flush on top of the cylinder? (b) How many kN of lead that makes the cylinder float with 0.5 m meter exposed above the water? (c) If lead is placed inside the cylinder, how many kN of lead will make the cylinder float with water just flush on top of the cylinder?