ii) Determine the maximum temperature required for the water of 1.5 liters to prepare Arabic coffee for a family using the following data. Heat energy of 640 kJ is supplied to the water - Specific heat capacity of water is 4.13 kJ/kg K - Density of water as 1000.1 kg/m3 - Room temperature is 22 °C a) Mass of water (in kg) - b) Maximum temperature required (in °C) ·
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- A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany. The standard measure of refrigeration capacity used in the United States is the ton (T); a 1 T capacity means that the unit is capable of making about 1 T of ice per day or has a heat removal rate of 12,00 Btu/h. The capacity of the American system is to be guaranteed at 3 T. What is this guarantee in SI units?1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) What are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature?To determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the material is subjected to a uniform heat flux of 2500 W/m2 while thermocouples embedded in the wall at 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions: Distance from the Surface (cm) Temperature (C) Test 1 0 40 5 65 10 97 15 132 Test 2 0 95 5 130 10 168 15 208 From these data, determine an approximate expression for the thermal conductivity as a function of temperature between 40 and 208C.
- Assume the following: ●In a light water reactor, approximately 1.0kg of spent nuclear fuel is produced for every50. megawatt-days (MWd) of thermal energy input. ●For the purposes of this analysis, assume the spent nuclear fuel produced is 1.8% Pu-240by mass. Pu-240 has a half-life of 6,430 years. ●The thermal efficiency of the power plant is 38% ●Use equation for radioactive decay: Qt= Q0^e-kt where: ○Qt = quantity of radioactive material at time t ○Q0 = original quantity of radioactive material ○k = the decay constant ○t = time interval in years ○The decay constant k is defined by the relation: Half life = ln(2)/k Diablo Canyon stores 95% of its spent nuclear fuel onsite. ii) How many metric tons of Pu-240 in the spent fuel will still be onsite in that year?a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.. An elliptical hair, 10.0 cm long, has the following semi-diameters A = 35\mu , B=25 \mu When the hair was extended from 10.0 cm to 10.1 cm at 50% RH the force on the hair increased by 11.3 grams. What is the modulus of elasticity in GPa, (round off) Group of answer choices 10.0 1.0 8.0 4.0
- a) Sydney tap-water has a fluid electrical conductivity (EC or σ) of approximately 210μS/cm. Express this in terms of Ohm metres (resistivity) and mS/m (conductivity). b) The fluid electrical conductivity (EC) was measured on a water sample first at 25 °C to 305 μS/cm, then later at 20 °C to 272 μS/cm. Assuming a linear relationship, calculate the EC at 10 and 30 °C. c) A 20 cm long cylinder with 10 cm diameter is filled with an undisturbed fully saturated sandstone core. A current (I) of 100 mA was passed through the cylinder and a voltage(V) of 10,700 V was measured. Calculate the resistance and the resistivity of the sample. d) If we further know that the porosity is 1%, can you estimate the fluid electrical conductivity?The amount of heat required to change the temperature of a material from T1 to T2 isgiven by Q= mCp(T2-T1). Using this equation, answer the following:a. How many BTU’s of heat are required to cook a beef roast weighing 10 lb from 40 to 130oF?, Cp = 0.8 BTU/lboFb. Convert the number of BTU’s of heat in watt hours.c. If this roast is heated in a microwave oven having an output of 200 watts, how long will it take to cook the roast?Mechanical Engineering. Please help to solve, will upvote after. What is the change in length of a 5-m tin rod if the temperature changes from 11 to245°C?
- For a specified heat input and a given volume which material will have the smallest tempera- ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be (a) slower at start and faster near the end (b) faster at start and slower near the end (c) both rates will be the same (d) this will depend on the material. (viii) A thin black plate at temperature T receives radiation from a surface at Temperature T1 and radiates to a surface at T2. If all surfaces are black at steady state (a) (T1 – T) > (T – T2) (b) (T1 – T) < (T – T2) (c) (T1 – T) = (T – T2) (d) can be any one of a, b or c. (ix) The temperature profile (in) a slab initially at a constant temperature and then allowed to cool by convection for a short time will be as shown in Fig : (a) E1.2a (b) E1.2b (c) E1.2c (d) E1.2d. TiPLEASE SOLVE THE FOLLOWING THREE QUESTIONS Question G: Generally speaking, (no numbers required), at what point does Newton's Model of Cooling (T=A+Be^kx) (when regarding dead bodies' temperatures) no longer work? What in reality gives us an indication that we’ve taken it too far? Question H: Assuming that the temperature of the person at the time of death (TOD) was 98.6 °F, set up a TOD equation using the values of ,A, ,B, and k you’ve calculated. Then, solve the equation using the same logarithm method you used to solve for .k. A: 68 Farehneits, B: 17.9 Fareinheit K: -0.002564 TOD: 98.6 Fareinheit Plug the above info into Newton's law of cooling: (T=A+Be^kx) Write your answer as a time, not just as x minutes. Recall that when ,x=0, the time is 2:00 PM. Question I: When forensic expert determines the time of death, they often have additional information besides body temperature. Suppose a coroner finds that the person who was murdered had an infection that probably raised the…1. Choose the material that is brittle, a poor thermal conductor, a good thermal insulator, and can withstand high temperatures. a. Ceramics b. Composites c. Polymers d. Metals 2. Choose the substance with the greatest surface tension. a. C9H20 b. C12H26 c. C6H14 d. C24H50 3. Condensation polymers A. Are deposited in molds by condensing vapors B. Also release a small molecule such as water when they are formed C. Usually are made from monomers containing one or more C=C bonds D. None of the Above