Problem 4 Given: The cylindrical piling for an offshore platform is expected to encounter currents of 160 cm/s and waves of a 12 s period and 3 m height. Required: If a 1:60 scale model is tested in the wave tank, what will be the current speed
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Problem 4
Given: The cylindrical piling for an offshore platform is expected to encounter currents of 160 cm/s and waves of a 12 s period and 3 m height.
Required: If a 1:60 scale model is tested in the wave tank, what will be the current speed
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- A prototype ocean platform piling is expected to encountercurrents of 150 cm/s and waves of 12-s period and 3-mheight. If a one-fifteenth-scale model is tested in a wavethe channel, what current speed, wave period, and wave heightshould be encountered by the model?The moment of the torpedo control unit in water was tested with a 1:8 scale scale model in a water tunnel of identical properties with a speed of 20 m/s if the measured moment in the model was 14 Nm. calculate 1) Determine the velocity of the prototype using the Reynolds number analogy. 2) Find the ratio of the forces occurring in the model and prototype. Using the analogy of Euler number 3) find the moment that occurred with the prototype.Here are these questions if I could get help with themIf a spherical storage tank holds 40,000 gallons (120,000 liters) of water,what diameter must it have?If a cylindrical storage tank has a 40-foot (12 m) diameter circular 05::=how high must it be to hold 1 million gallons (3 million liters)?If water is moving at a rate of 3.2 ft3/sec (90,000 cc/sec), how manygallons (liters) per minute is this?If the specific gravity of gold is 19.0. what is the weight of a cubic inch(cubic centimeter) of gold? A cubic foot (cubic meter)?
- A wave-energy harvester is to be built off the north shore of Honolulu (seawater at 20°C) where the average wave speed is V = 15 m/s. The size of the prototype device is characterized by its height H Laboratory water tank (fresh water at 20°C) where the wave speed is 5 m/s (shallow water wave speed is only a function of depth). 6 m. A model is to be tested in the Davidson (a) express the predicted power generated W as a function of density p, height H, wave speed V, and gravity g. (b) similarity. (c) output. Derive a set of dimensionless parameters using the Pi theorm that will Determine the height of the laboratory model device to ensure dynamic If the model produces 6.85 kW, determine the expected prototype powerEngineers are worried about the wind forces on a sculpture in Queen Mary campus. The sculpture has a height Ha = 5 m and a diameter, Da = 2 m, as shown in Figure Q3. The engineers decide to investigate making a smaller scale model testing in a water tunnel. They need to match the Reynolds number and the aspect ratio, AR = H/D. The characteristic length scale in the Reynolds number can be the diameter. Water has a density and viscosity of pw = 1000 kg/m3 and μw = 1 mPa. s, while air has a density and viscosity of pa = 1.2 kg/m3 and μa = 18 x 10-6 Pa. s. The average wind speed by the sculpture is Ua = 6 m/s. 1. The maximum height of the model that the engineers can place in the water tunnel is 1.5 m. Find the diameter of the model needed. 2. Find the average speed of water needed for the experiments to match the average wind speed past the sculpture. 3. It is known that at a wind speed of Ua = 4 m/s, the flow past the sculpture becomes turbulent. To visualise the flow in the experiments,…. What force would be exerted against a seawall if a 1:36 model 0.914 m long experienced a wave force of 120 N?4. A surface vessel 156
- LR = 5m, LG = 2.5m and LC = 1.1m Q2. The Skylark family of sounding rockets consisted of a number of variants (denoted Skylark 5, Skylark 7, and Skylark 12 respectively). These are illustrated on Page 3. The data given below is based on that for the rocket motors they used (all manufactured and named by what was Royal Ordinance – now part of Roxel): Raven XI Motor Total mass: 1280 kg Length = LR See Case Table (units are m) Diameter = 0.44 m Goldfinch IIA Motor Total mass: 420 kg Length = LG See Case Table (units are m) Diameter = 0.44 m Cuckoo IV Motor Total mass: 242 kg Length = LC See Case Table (units are m) Diameter = 0.44 m The payload mass which is additional to the motor masses is to be taken as 100 kg. (a) For the configurations of the three rockets shown on Page 3 in Fig. Q2: (i) Determine the Pitching/Yawing moment of inertia of each rocket about the base of each rocket. (ii) Explain how you could then find the the Pitching/Yawing moment of inertia of each rocket about its…Ex. The force required to tow a 1:30scale model of a motor boat in a lake at a speed of 2m/s is 0.5 N, Assuming that the viscosity resistance due to water and air is negligible in comparison with the wave resistance, calculate the corresponding speed of the prototype for dynamically similar conditions. What would be the force required to propel the prptype at that velocity in the same lake? Ans.: 10.95m/s, 13500NPLEASE ANSWER THEM ALL FOR AN UPVOTE. THANK YOU. Given: Pi constant to be used: 3.14159 Capillary tube: radius = 0.02 cm; length = 9 cm; pressure = 0.7 mmHg Liquid sample: density = 4 ml; time of flow = 4.5 seconds Ans. the ff questions. •What is the pressure in MKS unit? •What is the pressure in CGS unit? •What is the viscosity of the liquid? • If the weight was given as 8.5 grams, what will be the density of the liquid? •What is the kinematic viscosity of the liquid? •What is the fluidity of the liquid?
- A ship model has a scale of 1/50 is towed through sea water at a speed of 1 m/s. A force required to tow the model is 2 N, If the prototype is subjected to wave resistance only. then What is the speed of ship and the propulsive force on the ship?Suppose that a 5-foot-long chandelier falls from a 35-foot ceiling and that you are 6 feet tall and standing directly under the chandelier (See figure below). (a) How long do you have to get out of the way? Time seconds %3D (b) If you do not duck or get out of the way, how fast will the chandelier be traveling when it hits your head? Speed = feet/second 35 (c) If you were only 5 feet tall, how much greater would the speed of the chandelier be when it hit your head? Speed will be feet/second greaterWhat is the minimum speed the wind tunnel should be set at for a 2/3-scale model considering a minimum speed of 5 m/s and 20 m/s for the full scale model?