Archimedes' principle states that upthrust equals the weight of which of the following? Also, what happens to the viscosity of liquids as temperature increases?

7. Archimedes' principle states that upthrust equals the weight of the fluid displaced by the object. The correct option is B. B. Weight of fluid displaced Step 1: Determine the fraction submerged. For a floating object, the weight of the object is equal to the upthrust. The upthrust is equal to the weight of the fluid displaced. Weight of object (W_o) = _o V_o g Upthrust (F_B) = Weight of fluid displaced = _f V_sub g Since the object is floating, W_o = F_B. _o V_o g = _f V_sub g Divide both sides by g: _o V_o = _f V_sub The fraction submerged is the ratio of the submerged volume (V_sub) to the total volume of the object (V_o). V_subV_o = (_o)/(_f) Given: Density of wood (_o) = 600 kg/m^3 Density of water (_f) = 1000 kg/m^3 Step 2: Calculate the fraction submerged. V_subV_o = 600 kg/m^31000 kg/m^3 V_subV_o = 0.6 The fraction of the wood submerged is 0.6. The correct option is B. B. 0.6 As temperature increases, the viscosity of most liquids decreases. This is because the increased kinetic energy of the molecules allows them to overcome intermolecular forces more easily, reducing resistance to flow. The correct option is B. B. Decreases The stretched elastic skin behavior of liquids is called surface tension. This phenomenon arises from the cohesive forces between liquid molecules, which cause the surface to behave like a stretched elastic membrane. The correct option is C. C. Surface tension Step 1: Convert the pressure from mmHg to Pascals. Standard atmospheric pressure is 760 mmHg, which is equivalent to 1 atmosphere. The conversion factor for 1 atmosphere to Pascals is approximately 1.01325 × 10^5 Pa. Given: Pressure = 760 mmHg Step 2: State the approximate pressure in Pascals. Since 760 mmHg is exactly 1 atmosphere, its approximate value in Pascals is 1.01 × 10^5 Pa. The correct option is A. A. 1.01 × 10^5 Pa What's next? 🤔