Consider a carton of milk that is refrigerated at a temperature of
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Fundamentals of Heat and Mass Transfer
- In figure (1), The Gauge pressure at A reads P87 kPa. All fluids are at 20°C. Determine the elevations Z in meters of the liquid levels in the open piezometer tubes B and c. Gasoline S.G= 0.8, Glycerin S.G= 0.9, air density= 1.25 kg/m³. A В C 2 m Air 1.5 m Gasoline 1 m Glycerin -arrow_forwardA spherical container fitted with a stirrer traps air with a volume equal to 5 cubic meters. The initial pressure of the air is 276 kPa and the initial temperature is 250 degrees Celsius. The wall of the container is thick enoughsuch that heat flow can be neglected. If the stirrer transfers 400 kJ of energy to the air, determine the final pressure (kPa) and temperature (degrees Celsius). At the top of your solution, write in bullet form all the assumptions you made in solving the problem.arrow_forwardA pneumatic tube system is used in a hospital to quickly transport laboratory samples across the building. A cylindrical canister (radius r = 12.5 cm, mass m = 950 g) containing the sample is placed in a tube with roughly the same radius. The bottom of the tube is exposed to atmospheric pressure, but the portion of the tube above the canister is maintained at a slightly lower pressure, which sucks the canister into the tube. For the questions below, use 101,325 Pa for atmospheric pressure, and maintain 6 significant figures on your numerical answers. What absolute pressure P must be maintained in the portion of the tube above the canister in order to keep the canister stationary? (For simplicity, assume that the tube is coated with a non-stick surface so that friction can be ignored). What is the gauge pressure above the canister in the scenario described above? If tube system operator lowers the absolute pressure found in part (a) by 1.00%, then what is the acceleration of the…arrow_forward
- 100 Ib 50 Ib 45 250 lb 2. Determine M, P, and Q in the figure shown so that the resultant of the coplanar nonconcurrent force system is zero.arrow_forwardDean T, F,Vumay ; amax 2. k:25 M=25ka I= 225arrow_forwardGive the following problem a try. If you get stuck, here is one way to work it: Essential Solution Video. An airplane has a half-wingspan of 31 m. Determine the change in length of the aluminum alloy [a = 24.0 × 10-6/°C] wing spar if the plane leaves the ground at a temperature of 17°C and climbs to an altitude where the temperature is -51°C. Answer: 6 = i mmarrow_forward
- A system is any region prescribed in mass or a finite quality of matter enclosed by boundary, real or imaginary. (True/False) Pressure is the term used to express this property for liquids and solid (True/False) What are the differences between the open and closed systems? Draw some examples. What are the differences between the Sensible heat and Latent Heat? Draw some examples. Write down the steps of conducting a material balance. A batch of 5 kg of food product has a moisture contont of 15004arrow_forwardYou and your younger brother are designing an air rifle that will shoot a lead pellet with mass m = 1.20 g and cross-sectional area A = 0.0150 cm². The rifle works by allowing high-pressure air to expand, propelling the pellet down the rifle barrel. Because this process happens very quickly, no appreciable thermal conduction occurs and the expansion is essentially adiabatic. Your design is such that, once the pressure begins pushing on the pellet, it moves a distance of L = 40.0 cm before leaving the open end of the rifle at your desired speed of v = 110 m/s. Your design also includes a chamber of volume V = 13.0 cm³ in which the high-pressure air is stored until it is released. Your brother reminds you that you need to purchase a pump to pressurize the chamber. To determine what kind of pump to buy, you need to find what the pressure of the air must be in the chamber (in Pa) to achieve your desired muzzle speed. Ignore the effects of the air in front of the bullet and friction with…arrow_forwardWater is enclosed in the piston/cylinder system as shown in the figure. The initial temperature of the water is T1 = 140 °C. The mass of the enclosed water is m, = 12 kg. The piston has mass, m, = 500 kg and diameter, D, = 0.125 m. The water is heated until the specific volume is v, = 0.05 m/kg at which point the piston is fixed in position by a pin, i.e. piston can no longer move. The water is then further heated to a final temperature of T3 = 350°C. Assume that the atmospheric pressure is Po = 100.3 kPa and gravity is g = 9.81 m/s. a) What is the initial pressure of the water, P1, and specific volume v:? b) At state 2 what is the temperature, T2, and is the water a compressed liquid, saturated mixture or a superheated vapour? If the state is a saturated mixture, determine the quality. c) What is the final pressure of the water, P3? d) Draw a P - V (pressure - volume) diagram of the process. Label all state points, process lines, constant temperature line(s) and the pressure and…arrow_forward
- A vertical cylindrical shell storage tank of 4 m inside diameter and 6 m high is filled with three liquids having specific gravities of 3, 1 and 0.8. Each liquid has heights of 2 m inside the tank. A sharp edge orifice 120 mm diameter with C = 0.65 is located at the lowest point Determine the time to empty one half of its contents through orifice. Determine the time to empty the whole tank through the orifice.arrow_forward1. The flash point of an engine oil is 3630F. What is the absolute flash-point temperature in K and R isarrow_forwardK2 please help with my reviewer. Provide me the full solution and answer thank you SN=40arrow_forward
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