1. A 2-m-long, 4-cm-diameter shaft rotates inside an equally long 4.02-cm-diameter cylinder. If SAE-10W oil at 25-C fills the gap between the concentric cylinders, determine the torque and horsepower needed to rotate the shaft at 1200 rpm.
2. A 0.1-m3 volume of water is observed to be 0.0982 m3 after a pressure is applied. What is that pressure?
3. How long would it take a small wave to travel under 22-C water a distance of 800 m?