Answer:
238 N
Explanation:
Archimedes principle states that every body submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the body:
\(W_I=W-W_f\)
Here, \(W_I\) is the immersed weight of the copper, and \(W_f\) is the weight of the displaced water. Due to this, the copper has a weight when immersed in water of:
\(W_I=268N-30N\\W_I=238N\)
