A 40-Kg Cylinder of Solid Iron Is Supported by a String

Multiple Choice

A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is $7860 \mathrm {~kg} / \mathrm { m } ^ { 3 }$ and that of water is $1000 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

A) 34 N
B) 20 N
C) 40 N
D) 24 N
E) 2.5 N