PHY-102: Fluid and Thermal Physics Exercises

PHY-102: Fluid and Thermal Physics Exercises Corrections to the following: 1. CBAD; FEEDBACK: Calculate the density using Density = (mass) / (volume). 4. DBAC; FEEDBACK: The blocks with higher density will have a larger mass, and thus a larger force of gravity. For C the force of gravity is greater than the buoyant force, while for the other three it is equal to the buoyant force. Since the buoyant force is smallest for D (least volume of liquid displaced), a little greater for B and even greater for A, it can be concluded that D has the smallest force of gravity and thus the smallest mass and the smallest density. Likewise for the rest of the blocks. 16. C; 21. B; 22. A; 23. C; 25. D 1. Rank the following in terms of increasing density: B, C, A, D A. A100 g object with a volume of 25 cubic centimeters B. A 200 g object with a volume of 100 cubic centimeters C. A 100 g object with a volume of 100 cubic centimeters D. A 400 g object with a volume of 50 cubic centimeters 2. Rank the following in terms of increasing pressure: D, C, A, B A. A 10 kg object distributed on a square surface with dimensions 10 cm by 10 cm B. A 20 kg object distributed on a square surface with dimensions 10 cm by 10 cm C. A 30 kg object distributed on a square surface with dimensions 20 cm by 20 cm D. A 40 kg object distributed on a square surface with dimensions 30 cm by 30 cm 3. Consider four blocks with identical volumes placed in water as shown below. Which block has the smallest buoyant force on the water and why? D, because with less volume of the block submerged in the water, less floating force is exerted. 4. Consider four blocks with identical volumes placed in water as shown below. Rank the blocks in terms of increasing density: C, A, B, D