5. A wooden block with a density of 0.6 g/cm³ floats on water (density of water = 1.0 g/cm³). What percentage of the block's total volume is submerged?(A) 40%(B) 50%(C) 60%(D) 100%

9. According to the First Law of Thermodynamics, if a closed system absorbs heat Q from its surroundings and does work W on its surroundings, what is the change in the internal energy of the system, ΔU? (Sign convention: heat absorbed is positive, work done by the system is positive) (A) ΔU = Q + W (B) ΔU = Q - W (C) ΔU = W - Q (D) ΔU = -Q - W

5. A wooden block with a density of 0.6 g/cm³ floats on water (density of water = 1.0 g/cm³). What percentage
of the block's total volume is submerged?
(A) 40%
(B) 50%
(C) 60%
(D) 100%

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