Conceptual Physics Ch 13 Test Questions with Answers

Conceptual Physics Ch 13 Test Questions with Answers When you stand on one foot instead of two, the force you exert on the floor is A) less. B) the same. C) more. D) None of the above. - Answer-B) the same. When you stand on one foot instead of two, the pressure you exert on the floor is A) less. B) the same. C) more. D) None of the above. - Answer-C) more. Twice as much, in fact! Water pressure provided by a water tower is greater if the tower A) is taller. B) holds more water. C) Both A and B. D) None of the above. - Answer-A) is taller. Only depth, not amount of water, contributes to pressure. A cook who measures a specific amount of butter by placing it in a measuring cup with water in it is using the A) principle of buoyancy. B) displacement rule. C) concept of density. D) All of the above. - Answer-B) displacement rule. How many forces act on a submerged body at rest in a fluid? A) One—buoyancy B) Two—buoyancy and the force due to gravity. C) None—in accord with the equilibrium rule. D) None of the above. - Answer-B) Two—buoyancy and the force due to gravity. On which of these blocks submerged in water is the buoyant force greatest? A) 1 kg of lead B) 1 kg of aluminum C) 1 kg of uranium D) All the same. - Answer-B) 1 kg of aluminum When a fish expands its air bladder, the density of the fish A) decreases. B) increases. C) remains the same. D) None of the above. - Answer-A) decreases. When a fish makes itself less dense, the buoyant force on it A) decreases. B) increases. C) remains the same. D) None of the above. - Answer-B) increases. When a fish decreases the size of its air bladder, the density of the fish A) decreases. B) increases. C) remains the same. D) None of the above. - Answer-B) increases. When a submarine takes water into its ballast tanks, its density A) decreases. B) increases. C) remains the same. D) None of the above. - Answer-B) increases. When a submerged submarine expels water from its ballast tanks, its density A) decreases. B) increases. C) remains the same. D) None of the above. - Answer-A) decreases. The reason a person finds it easier to float in saltwater compared with freshwater is that in saltwater A) the buoyant force is greater. B) a person feels less heavy. C) Neither of these. D) None of the above. - Answer-C) Neither of these. A person floats higher because a smaller volume of the denser saltwater is displaced. On a boat ride, the skipper gives you a life preserver filled with lead pellets. When he sees the skeptical look on your face, he says that you'll experience a greater buoyant force if you fall overboard than your friends who wear Styrofoam-filled preservers. A) He apparently doesn't know his physics. B) He is correct. - Answer-B) He is correct. but what he doesn't tell you is you'll drown! Your life preserver will submerge and displace more water than those of your friends who float at the surface. Although the buoyant force on you will be greater, the net force downward is greater still!