Buoyant force exceeds weight for submerged wood Steps:

• Forces on block: weight mg downward, buoyant force ρVg upward, tension T downward (string holds it submerged against buoyancy).
• Equilibrium: net force zero, so upward buoyant force equals downward weight plus tension.
• ρVg = mg + T.
• Solve for tension: T = ρVg - mg.

Why D is correct:

• Archimedes' principle states buoyant force is ρVg; equilibrium requires it to balance mg + T for a floating-tendency object held down.

Why the others are wrong:

• A: ρVg is buoyant force alone, ignoring need to subtract weight.
• B: mg + ρVg adds forces incorrectly, as if tension reinforces both.
• C: mg is weight alone, neglecting buoyant force entirely.

Final answer: D