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- The 50-kg block in the figure is initially at rest on a horizontal plane. Determine the friction force between the block and the surface after P was gradually increased from 0 to 245.25 N. In which phase will the block be classified (Phase 1- no motion, Phase 2 - impending motion, or Phase 3 - in motion)? = 50(9.81) = 490.5 N W 4, = 0.5 H= 0.2 %2D Hint: At which phase will the block be if P-245.25N - Phase 1 (no motion)? Phase 2 (impending motion)? Phase 3 (in motion)? Make use of the coefficient of friction and the normal force to solve for the maximum frictional force.1.REYNOLDS NUMBER is indicator of the nature of flow where flow consist of laminar or turbulent flow O true O FalseA concentric cylinder viscometer may be formed by rotating the innermember of a pair of closely fitting cylinders. The annular gap is small so that alinear velocity profile will exist in the liquid sample. Consider a viscometer withan inner cylinder of 4 in. diameter and 8 in. height, and a clearance gap widthof 0.001 in., filled with castor oil at 90_F. Determine the torque required to turnthe inner cylinder at 400 rpm.
- A Cole pitometer is set with its orifices at the center of a 40cm pipe. For three different rates ofdischarges, the deflection, “Z” of the carbon tetrachloride (sp.gr. 1.50) in the differential gauge is 65 mm, 185mm and 340 mm.With C = 0.84, what are the discharges? The ratio of the mean velocity to center velocity may be assumed as 0.83.In a fluid the velocity mea sured at a distance 75 mm from the boundary îs 125 m/s- The fluid has absolute vis co Sity o.048 Pa s and of rejutive density 0.913. What is the velouty gradient and shear Stress qt the boundary assuming a linear velocity distribution ? Determine kinematic viscosity.A rectangular plate of aluminum with a specific gravity of 2.7 is floating between a mercury-water interface. Specific gravity of mercury is 13.56. 10.0 Determine the ratio of the depths of the portion of the plate submerged in water to that portion submerged in steel. a.) 0.16 c.) 0.25 e.) b.) 3.94 d.) 6.39 11.0 Determine the depth submerged in water if the portion submerged in mercury is 20 mm. c.) 5 mm d.) 3 mm a.) 128 mm e.) b.) 79 mm
- 5d-20°C BOD is 149 mg/L. What would have been the 3-d BOD if the test had been conducted at 30°C? Assume 20°C reaction constant K=0.23 d 1 and=1.056. a. 250 mg/L O b. 66.5 mg/L c. 220.72 mg/L d. 144.88 mg/LDisC A of mass M=10ka, slides down an incloned plane while Jubricated by a thin film of oil as ahown belowp The Is O cm in diameter and thickness of the film is h= zmm. Find the final velocity of the BDoise assuming constant velactyy and linear velocity distribution, the oil is SAE 50 oil with M- 8.6 Kió kg Im.s & f =902 kglm? %3D Derive the formala & Br aw the free body Dingram. Tocm th=zmm. To =30Q3/ The dimensions of a rectangular solid at a given instant (t) are: 1)-13 cm, W(L) 9 cm. Ht,)-5 cm. If (L.) and (H) are increasing at 2 cm/sec and W is decreasing at 4 om/ses, Find the rate of change of surface area af time (to),
- A 35 N plate having a dimension of 3 m by 3 m is sliding on a ramp (slope = 35o ) at a velocity of 3.7 cm/s. The plate and the ramp has a clearance which is filled with a thin film of lube oil with a viscosity of 0.08 Pa-s. Neglecting the edge effects, calculate the clearance between the ramp and the plate.A vertical clean glass tube of uniform bore is to be used as a piezometer for measuring pressure of a liquid at a point. The liquid has a mass density of 1425 kg/m³ and a surface tension of 0.06 N/m in contact with air. If the capillary rise in the tube is not to exceed 2.0 mm, the required minimum diameter (in mm) of the tube is {Take angle of contact with glass is zero]A calibration test of a 15-mm diameter circular sharp-edged orifice in a vertical side of a large tank showed a discharge of 760 N of water in 60 seconds at a constant head of 6.50 m. Measurement of the jet showed that it traveled 3.20 m. horizontally while dropping 450 mm. Compute for the nearest value of the coeficient of discharge. O 0.60724 O 0.67240 O None of the above O 0.64702 O 0.64027