A body at a temperature of 50 deg. Fis placed outdoors where the temperature is 100 deg. F. If after 5 minutes the temperature of the body is 60 deg. F, find the temperature of the body after 30 minutes. Select the correct response O 795 deg. F O None O 83.77 deg. F 87.04 deg. F
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- 3 A rigid tank with volume of 1 m contains 2 kg of water at 100 C. The tank is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 200 C? 00 Select one: on O a. 534.33 b. 478.83 Oc.592.43 Od.431.42 Oe None of the above Electric heateris used to heat 0 63 liters/minute of water (C, = 4.18 kJ/kg.K, density =1000 kg/m) from 25 °C to 65 C What is the current (in Ampéres) that must be supplied to this heater if the supplied voltage is 220 vered of 2.00 eslion Select oner 0a 10.37 O6 11 97To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D; 2 = 250 mm and wall thickness t, = tị. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T.0 = -5°C and provides an external convection heat transfer coefficient of h. flowing crude oil is h; = 450 W/m²-K. 0.03 W/m-K) 500 W/m2-K. The convection coefficient associated with the (2) It is proposed to enhance the performance of the…The left side of this equation tells how much energy Q the cylinder gives to the water while it cools. The right side of this equation tells how much energy Q the water and aluminum cup absorb from the cylinder to warm up. Because it is the same energy, they are equal. What is known in this equation? Mcyl 411.7 g, malum 46.5 g, malum+water = 175 g Can you find: mwater =? g Twater = Talum = 20°C (water and cup of room temperature) 90°C, T; = 35°C (hot cylinder and cool "cylinder+cup+water" temperatures) Tcyl kCal Calum = 0.22, Cwater 1 (specific heat of water and aluminum, measured in units kg-°C What are we looking for is Ccul - How we find it? Plug all the numbers into the equation (1), Ccul will be one unknown which you can calculate from the equation. Important, convert all the masses from grams to kilograms! After you find Ccyl, compare it to known value for the copper 0.093(our cylinder is made out of copper). |Ceyl -0.093| % : · 100% 0.093
- Use Newton's Law of cooling to determine the k value in air temperature of 40 degC. If 30 mins ago the boy was 120 degC and 10 mins age it was 80 degC. Select the correct response: 0.0321 -0.321 0.0235 -0.0235 none of the choicesTRUE OR FALSE: 1.A linear differential equation of the higher order is one which contains the dependent variable and all its derivatives to the first degree only. 2.The surface temperature of a cooling object changes at a rate proportional to the difference between the surface and ambient temperatures.1. Determine the equivalent spring stiffness constant of the following. 240 N/m wwwwww a. 150 N/m 60 N/m 250 N/m 290 N/m 105 N/m F 145 N/m 35 N/m Ans:
- Q2- Determine: A small solid at temperature of 85 °C is to be cooled in a cooling chamber maintained at 10 °C. 1- The time required for the temperature of the solid to reach 13 °C if the proportionality constant is a = 0.002/m² with a contacting surface area A = 0.2 m². 2- The temperature of the ball after 30 s. 3- The final temperature of the ball. Bulk environmental temperature = T₁ AZ Surface area, A- Solid T(t) Initial solid temperature, ToAir movement in a room is 0.4 m/s and light clothing (0.5 clo) is being worn by the occupants. If the activity level is considered as 2.5 met, what is the operative temperature? Hint: Use Figure 4-3b to obtain To and then convert from Celcius to Fahrenhite. O a. 73.4°F Ob. 76.1°F OC. 66.2°F Od. 69.0°F O e. 80.4°FA 1 cubic meter of water inside a one kg ahminum container is heated from 20°C to 30°C. Find the heat supplied to the system if CA1 = 0.22 cal / gm Note: Assume that there is no heat loss and temperature of water is always equal to the temperature of ahuminum container. а. 20,002,200 cal b. 10,002,200 cal °C. c. 30,002,200 cal d. 40,002,200 cal
- K). average NUSseit Number. 2. A slab of iron with temperature, T1=48 deg C is used to heat a flat glass plate that has an initial temperature of Tg1=18 deg C. Assuming no heat is lost to the environment, and the masses are m;=0.49 kg for the slab and mg=310g for the plate, what is the amount of heat transferred when the two have reached equal temperature? Assume C;=0.11 kcal/kg-deg C for iron and cg=0.20 kcal/kg-deg C for glass.TRUE OR FALSE 4.) Bioyield is considered an elastic state and is located within the proportional limit 5.) The difference in the effect of temperature on viscosity of liquids and gases is related to the difference in their density. 6.) The parallel method of thermal conductivity calculation is based on the weighted harmonic mean of the componentsQi: (50 marks) Find the total heat flux of the composite wall when: B KA = KC = KF = 15 m. K KB = KD = 10 m. K KE = KG = 20 %3D m. K D. Height of B = C = D 4 cm 3 cm 4 cm 6 cm Height of F = G AT = 30 K