Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 17, Problem 17.3PP
Determine the terminal velocity (see Section 2.6.4 ( Chapter 215) of a
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QUESTION #2
(a.) What is the terminal velocity of a composite disc (1 mm thick with an area of 12 mm²), in
water? The density of the composite is 3117 kg/m³.
(b.) What is the diameter of a spherical steel particle settling in an oil of viscosity 10 mN.s/m²
if its terminal falling velocity is 55 mm/s? The density of the oil and steel are 820 kg/m³
and 7870 kg/m³ respectively.
A piston 113 mm diameter and 150 mm long has a mass of 9 kg. It is placed in a vertical cylinder 115 mm
diameter containing oil of dynamic viscosity 0.12 Pa · s and relative density 0.9 and it falls under its own
weight. Assuming that piston and cylinder are concentric, calculate the time taken for the piston to fall
steadily through 75 mm.
FLUID MECHANICS
0.5m by 2m flat thin plate is moved at 5m/s on a 2-mm thick layer of SAE30 oil at 38 degrees Celsius that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be linear. What force is required if the plate and surface are horizontal? (μSAE30 = 0.1 N-s/m2)
Chapter 17 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 17 - A cylinder 25 mm in diameter is placed...Ch. 17 - As part of an advertising sign on the top of a...Ch. 17 - Determine the terminal velocity (see Section 2.6.4...Ch. 17 - Calculate the moment at the base of a flagpole...Ch. 17 - A pitcher throws a baseball without spin with a...Ch. 17 - A parachute in the form of a hemispherical cup 1.5...Ch. 17 - Calculate the required diameter of a parachute in...Ch. 17 - A ship tows an instrument in the form of a 30...Ch. 17 - A highway sign is being designed to withstand...Ch. 17 - Assuming that a semitrailer behaves as a square...
Ch. 17 - A type of level indicator incorporates four...Ch. 17 - Prob. 17.12PPCh. 17 - A bulk liquid transport truck incorporates a...Ch. 17 - A wing on a race car is supported by two...Ch. 17 - Prob. 17.15PPCh. 17 - The four designs shown in Fig. 17.16 for the cross...Ch. 17 - Prob. 17.17PPCh. 17 - Prob. 17.18PPCh. 17 - An antenna in the shape of a cylindrical rod...Ch. 17 - Prob. 17.20PPCh. 17 - Prob. 17.21PPCh. 17 - Prob. 17.22PPCh. 17 - Assume that curve 2 in Fig. 17.5 is a true...Ch. 17 - Prob. 17.24PPCh. 17 - Prob. 17.25PPCh. 17 - A small, fast boat has a specific resistance ratio...Ch. 17 - Prob. 17.27PPCh. 17 - Assume that Fig. 17.11 shows the performance of...Ch. 17 - Calculate the total drag on an airfoil that has a...Ch. 17 - Prob. 17.30PPCh. 17 - Prob. 17.31PPCh. 17 - Prob. 17.32PPCh. 17 - Prob. 17.33PP
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- Calculate the capillary effect in millimetres in a glass tube of 4 mm diameter, when immersed in mercury. The temperature of the liquid is 20° C and the value of surface tension of mercury at 20°C in contact with air is 0.51 N/m. Take contact angle as 130° and specific weight 133 kN/m.arrow_forwardCalculate the capillary effect in millimetres in a glass tube of 4 mm diameter; when immersed in (i) water and (ii) mercury. The temperature of the liquid is 20°C and the values of surface tension of water and mercury at 20°C in contact with air are 0.0735 N/m and 0.51 N/m respectively. The contact angle for water 0=0° and for mercury 0= 130°. Take specific weight of water at 20°C as equal to 9790 N/m³.arrow_forwardCalculate the maximum diameter (mm) of a steel ball that would float on water at 15°C. At 15°C, σ = 0.0741 N/m. Take density of steel = 7763 kg/m3.arrow_forward
- Qustion. An aircraft is flying in level flight at a speed of 200 km/h through air (density, p = 1.2 kg/m³, and viscosity, μ = 1.6 x 10-5 N-s/m²). The lift coefficient at this speed is 0.4 and the drag coefficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft NOTE= Do not give wrong answer I will dislike , If not sure skip itarrow_forwardfluid mechanics explain the effect of aerodynamic drag and lift on aerofoilsarrow_forwardA cylinder 1 inch in diameter is placed in a hot water pipe at right angles to the direction of theflow. The fluid and cylinder temperatures are at 80 °F and 100 °F respectively. Calculate thevalue of the film coefficient for a mass flow of 2705 lb/hr.arrow_forward
- A stationary sphere in water moving at a velocity of 2.3 m/s experiences a drag of 6N.Another sphere three times the diameter is placed in a wind tunnel.The ratio of kinematic viscosities of air and water is 15, and the density of air is 1.28 kg/m3.Determine the velocity of the air and the drag which will give dynamically similar conditions.arrow_forwardA minivan is pulled by a tow truck at 60 kph. The boxlike van is 20m long, 6m high, and 3.75m wide. Estimate the skin friction, Df, on the van's top and sides. Take the density and viscosity of air as 0.0023 kg/m3 and 0.3758x10-6 N-s/m2.arrow_forward(B) The space between two large plane surfaces kept (2.5 cm) apart is filled with liquid of viscosity (0.0825 kg / m.s) .What force is required to drag a thin plate of surface area (0.5 m between the two large surfaces at speed of (0.5 m/s), (i) when the plate is placed in the middle of the two surfaces, and (ii) when the plate is placed (1.5 cm) from one of the plate surfaces?arrow_forward
- Question 9 Consider the flow of water over a flat plate. In a different experiment consider the flow of air over a flat plate. In both cases the flow is steady, the boundary layers that are formed are laminar and the gravitational acceleration can be neglected. In both cases the velocity far from the plates is the same (v.) and the temperature is also the same (80 °F). For the same distance x from the leading edge, in which boundary layer will the friction coefficient be higher? (a) The friction coefficient is the same for both cases. (b) In water. (c) In air. (d) It depends on the velocity profile that is assumed inside the boundary layer.arrow_forwardIn diffusive equilibrium, determine the variation of air density p(h) with altitude, provided that the Earth's atmosphere is in thermal equilibrium at a temperature of 27.0 °C. What is the density of air at an altitude of 9.00 km? Assume that air is made up of only nitrogen molecules N2. There are seven protons and seven neutrons in the nucleus of a nitrogen atom N. g=9.80 m/s?, m,=1.67x1027 kg , kg = 1.38x10-23 J/K , 1 atm=1.01x105 N/m?. %3Darrow_forwardProb.5. Calculate the capillary effect in millimetres in a glass tube of 4 mm diameter, when immersed in mercury. The temperature of the liquid is 20° C and the value of surface tension of mercury at 20°C in contact with air is 0.51 N/m. Take contact angle as 130° and specific weight 133 kN/m².arrow_forward
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