Q.6 Why do buildings have wide foundation?
Q.7 How does the density of fluid affect the magnitude of buoyancy acting on an object immersed in it?
Q.8 State Archimedes principle.
Q.9 Give two applications of Archimedes principle.
Q.10 Give the SI unit of relative density.
Q.11 Relate relative density of a substance to its density.
Q.12 Density of a solid is 7.5 g/cm3 . What is its relative density?
Answers
Answer:
6).Buildings have wide foundation because pressure is inversely proportional to area so when we increase area the pressure reduces. So to decrease the pressure buildings have wide foundation.
8).According to archimedes principle when an object is completely or partially immersed in a fluid it experiences a buoyant force which is equal to the weight of water displaced by it.
9)Used in designing the ships and lactometers.
10). It has no unit.
Answer:
Q6 In order to avoid buckling(depression), and so to avoid bending of the building.
Q7 As density of fluid increases, the buoyancy force acting on the object also increases
Q8 Any body partially or fully immersed in a fluid, the loss of weight of a body is equal to the weight of the liquid displaced by the body, this is called archimedes principle
Q9 *For checking impurities present in the object
*To calculate the weight of the body
Q10 Relative density is a ratio and hence has no unit
Q11 Relative density is defined as the ratio of the density of the substance to the density of water.
Q12 Relative density=7.5/1000=0.0075
Explanation: