Mechanical Engineering Principles

232 MECHANICAL ENGINEERING PRINCIPLES base of the tank is 32.3 kPa, determine the density of the petrol. Take the gravitational ...

HYDROSTATICS 233 From above, absolute pressure =atmospheric pressure+gauge pressure =( 101 + 302. 82 )kPa= 403 .82 kPa That is,t ...

234 MECHANICAL ENGINEERING PRINCIPLES Hence,the relative density of the body = 3305 kg/m^3 1000 kg/m^3 = 3. 305 Problem 9. A rec ...

HYDROSTATICS 235 1000 kg/m^3. If the depth of the box in the water is 280 mm, what is its weight? [2.47 kN] A body weighs 18 N ...

236 MECHANICAL ENGINEERING PRINCIPLES Atomospheric pressure Vacuum Mercury Barometric hegiht,h Trough (a) Atomospheric pressure ...

HYDROSTATICS 237 Sealed vessel S Pointer Pivot Scale Atmospheric Pressure Figure 21.5 A portable type often used is theaneroid b ...

238 MECHANICAL ENGINEERING PRINCIPLES Measuring scale Gas A Mercury BA B h 1 (a) (b) (c) (d) Gas ABAB h 2 h PA PB Figure 21.7 to ...

HYDROSTATICS 239 is clear that the sum of the pressure components, i.e. the total force acting on the sidesA andC, exceeds the s ...

240 MECHANICAL ENGINEERING PRINCIPLES Pirani gauge The Pirani gauge measures the resistance and thus the temperature of a wire t ...

HYDROSTATICS 241 Hence, y′= ∫ ρgy^2 sinθdA ρgsinθ ∫ ydA = ρgsinθ ∫ y^2 dA ρgsinθ ∫ ydA = (Ak^2 )Ox Ay where(Ak^2 )Ox=the second ...

242 MECHANICAL ENGINEERING PRINCIPLES 21.14 The stability of floating bodies For most ships and boats the centre of buoyancy (B) ...

HYDROSTATICS 243 From equation (21.1), GM= Px W cotθ = 490 .5N×10 m× 57. 29 981 × 103 N i.e. metacentric height,GM= 0 .286 m Now ...

244 MECHANICAL ENGINEERING PRINCIPLES surface of the water, what is the value of its buoyancy? [78.59 MN] A barge of length 20 ...

HYDROSTATICS 245 area of the surface is 5 m^2 , the pressure on the area is: (a) 250 Pa (b) 10 Pa (c) 45 Pa (d) 55 Pa Which of ...

246 MECHANICAL ENGINEERING PRINCIPLES In questions 14 to 18 select the most suitable pressure-indicating device from the followi ...

22 Fluid flow 22.1 Introduction The measurement of fluid flow is of great impor- tance in many industrial processes, some exampl ...

248 MECHANICAL ENGINEERING PRINCIPLES (a) (b) AB Orifice plate Direction of flow Pressure due to orifice plate Figure 22.2 and f ...

FLUID FLOW 249 Pressure tappings are made at the entry (atA) and at the throat (atB) and the pressure differenceh which is measu ...

250 MECHANICAL ENGINEERING PRINCIPLES h B A Direction of fluid flow Figure 22.6 difference ofh, may be calibrated to indicate th ...

FLUID FLOW 251 (a) Cup anemometer. An anemometer is an ins- trument that measures the velocity of moving gases and is most often ...