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Note: In the following problems, you will deal with both the International System of Units (SI) (N, kg, m, s, K) and the English Engineering System (lb, slug, ft, s,
Just upstream of a shock wave, the air temperature and pressure are 288 K and 1 atm. respectively: just downstream of the wave, the air temperature and pressure are 690 K and 8.656 atm, respectively. Calculate the changes in enthalpy, internal energy, and entropy across the wave.
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- The gravitational constant g is 9.807 m/s2 at sea level, but it decreases as you go up in elevation. A useful equation for this decrease in g is g = a – bz, where z is the elevation above sea level, a = 9.807 m/s2, and b = 3.32 × 10–6 1/s2. An astronaut “weighs” 80.0 kg at sea level. [Technically this means that his/her mass is 80.0 kg.] Calculate this person’s weight in N while floating around in the International Space Station (z = 354 km). If the Space Station were to suddenly stop in its orbit, what gravitational acceleration would the astronaut feel immediately after the satellite stopped moving? In light of your answer, explain why astronauts on the Space Station feel “weightless.”arrow_forward74 PROBLEMS : A cube of wood floats in oil with a relative density of 0,78 so that half of the cube is out of the oil. The mass of the cube is 2 kg. (a) Determine the dimensions of the cube. [0,172 m] (b) To what depth will a 3 kg cube of the same wood sink in sea water with a density of 1 025 kg/m³ . [0,075 m] (c) Determine the mass to be added to a 6 kg block of the" same wood so that the block will sink in sea water. [9,765- kg]arrow_forward1. If sufficient data are provided, complete the blank cells in the following table of properties of water. In the last column describe the condition of water as compressed liquid, saturated mixture, superheated vapor, or insufficient information; and, if applicable, determine the quality. Phase description / quality, if applicable T u, h V[m³/kg] | bar] [°C] 260 [kJ/kg] [kJ/kg] В 0.0012755 C 20 0.12 D 100 E 160 2700 25arrow_forward
- In medical literatures, local blood perfusion rate is typically presented as xx ml/(min 100g tissue), in another word, it represents xx ml of blood supplied to a tissue mass of 100 g per minute to satisfy its nutritional needs. As we learned from the course lectures, the local blood perfusion rate appearing in the Pennes bioheat equation is in a unit of 1/s, or can be interpreted as xx ml of blood supplied to a tissue volume of 1 ml per second. The following lists the blood perfusion rates in various organs or structures in a human body from medical textbooks: brain (50 ml/(min 100g tissue)), kidney (35 ml/(min 100g tissue)), and muscle at rest (3 ml/(min 100g tissue)). Please convert the above local blood perfusion rates into values with the unit of 1/s, therefore, they can be used in the Pennes bioheat equation. The tissue density in a human body is 1050 kg/m³.arrow_forward1. Find the force required to move a load of 300 N up a rough plane, the force being applied parallel to the plane. The inclination of the plane is such that a force of 60 N inclined at 30° to a similar smooth plane would keep the same load in equilibrium. The coefficient of friction is 0.3. [Ans. 146 N]arrow_forwardComplete the following table for saturated water. Temp T ("C) Pressure P Entropy s (kJ/kg.K) Quality x Phase description (kPa) 120 5000 [1.1]? [1.2]? [1.3]? 50 1000 [1.4]? [1.5]? [1.6]? 400 1800 [1.7]? [1.8]? [1.9]? [1.10]? 40 [1.11]? X = 0.9 [1.12]?arrow_forward
- A hemispherical container, 26 inches in diameter, is filled with a liquid at 20°C and weighed. The liquid weight is found to be 1617 ounces. What is the density of the fluid in kg/m3? ]kg/m3arrow_forward36. In a car tire are 9.0 dm³ air at 12 °C under a inflation pressure of 2.2 bar. During a long journey, the air inside the tire warms up to 76 °C as a result of flexing and sunlight. The tire extends insofar that the new air volume is 9.4 dm. Which inflation pressure prevails in the tire? [pressure 2.75 bar]arrow_forward(а) The efficiency, n of a propeller depends on density, p, dynamic viscosity, µ of the fluid, angular velocity, w, diameter of propeller, D and discharge through the propeller, Q. With the help of Buckingham pi-theorem, show that the relation between efficiency and other variables is given by, Q n = f [D²wp 'D³w]arrow_forward
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