Chapter Questions
Look up the density of the metal of the object used in Parts A and B of the procedure (Appendix A, Table A1), and compare it with the experimental value. If there is any difference, comment on the reason(s).
In Part B, the string will cause error. When does it lead to an experimental density that is too high? Too low?
Discuss the situation that occurs when an object is immersed in a fluid that has the same density as the object.
(a) Explain how a submarine is caused to submerge and surface without the use of its propulsion propeller and fins.
A block of wood floats in a beaker of water. According to Archimedes' principle, the block experiences an upward buoyant force. If the beaker with the water and floating block were weighed, would the measured weight be less than the sum of the weights of the individual components? Explain.
A person can lift $45 \mathrm{~kg}(\approx 100 \mathrm{lb})$. Using the experimental value of the specific gravity for the metal object in Part B, how many cubic meters of the metal could the person lift (a) in air, (b) in water? How many actual kilograms of metal is this in air and in water?
Explain the principle and construction of a hydrometer. What is the purpose of the common measurements of the specific gravities of an automobile's radiator coolant and battery electrolyte?