The string will cause error. When does it lead to an experimental density that i
ID: 2078820 • Letter: T
Question
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. (b) Which has the greater density: (1) ice or water, (2) milk or cream? 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.Explanation / Answer
(a) It depends on teh allowable error. If the error is plus minus 1%. That implies that if the volume of the submerged part of the string is more than 1/100 the voluem of the suspended mass, teh error will exceed the limit. The error should be very small, because the test mass needs only to be just below the surface. The amount of string in the water would be very small. If we neglect the surface tension effect there could be virtually no string in the water.
(b)
suppose that an object has the same density of the fluid in which it is submerged, then teh weight of the object and teh weight of the fluid will be exactly the same. the buoyant force and weight are balanced and the object will be naturally buoyant. It will not move unless it was already moving or unless a force other than gravity or buoyancy acts on it.
(c) A submarine can take water into its ballast tanks to sink and blow them out with air to get lighter and surface.
(d) water has more density, milk has more density
(e) Not it will not be, because the buoyant forces are internal forces and tehy are not felt when weighed externally.
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