1. Solid Copper has a density of 8960 Kg/m3. What is the mass of a cube of copper with side length 0.1 m? 2. Liquid mercury has a density of 13,534 Kg/m3. What is the pressure difference (gauge pressure) between a point on the surface and one point 1 m deep inside a tank of mercury? 3. Under the assumption that the density of the air does not change with the altitude, using equation P-P0 =rgh , the air densityr = 1 Kg/m3 , P0 = 0 Pa outside earth atmosphere, P = 1*105 Pa at the earth surface, calculate the height h of the earth atmosphere. 4. A hydraulic pressure needs to lift a 3,000 Kg load (against gravity) by using an input force of 1000 N. All frictions are negligible and the area of the platform under the load is 10 m2. Calculate the (maximum) area of the section of the pump where the input force is applied. 5. The following picture depicts a solid object completely submerged into a homogenous fluid. .gif”> (i) Is the pressure at point (A) higher, as high as, or lower than pressure at point (B)? (ii) Is the pressure at point (A) higher, as high as, or lower than pressure at point (C)?
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
1. Solid Copper has a density of 8960 Kg/m3. What is the mass of a cube of copper with side length 0.1 m? 2. Liquid mercury has a density of 13,534 Kg/m3. What is the pressure difference (gauge pressure) between a point on the surface and one point 1 m deep inside a tank of mercury? 3. Under the assumption that the density of the air does not change with the altitude, using equation P-P0 =rgh , the air densityr = 1 Kg/m3 , P0 = 0 Pa outside earth atmosphere, P = 1*105 Pa at the earth surface, calculate the height h of the earth atmosphere. 4. A hydraulic pressure needs to lift a 3,000 Kg load (against gravity) by using an input force of 1000 N. All frictions are negligible and the area of the platform under the load is 10 m2. Calculate the (maximum) area of the section of the pump where the input force is applied. 5. The following picture depicts a solid object completely submerged into a homogenous fluid. .gif”> (i) Is the pressure at point (A) higher, as high as, or lower than pressure at point (B)? (ii) Is the pressure at point (A) higher, as high as, or lower than pressure at point (C)?
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