A flow calorimeter is a device used to measure the specific heat of a liquid. Energy is added as heat at a known rate to a stream of the liquid as it passes through the calorimeter at a known rate. Measurement of the resulting temperature difference between the inflow and the outflow points of the liquid stream enables us to compute the specific heat of the liquid. Suppose a liquid of density 0.86 g/cm³ flows through a calorimeter at the rate of 8.1 cm³/s. When energy is added at the rate of 200 W by means of an electric heating coil, a temperature difference of 18°C is established in steady-state conditions between the inflow and the outflow points. What is the specific heat of the liquid? Number Units

A gas chamber is to be designed to separate two gases with the following specifications: Hot gas temperature 1145°C Cold gas temperature 45°C Hot gas heat transfer coefficient 230 W/m² K Cold gas heat transfer coefficient 290 W/m² K Metal wall thermal conductivity 115 W/m K If the maximum temperature of the wall on the hot side does not exceed 545°C, using thermal resistance concept, what thickness should the metal wall between the hot gas and cold gas be in mm?

Problem 21. Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its temperature and that of its sur- roundings. Suppose that the temperature of a cup of coffee obeys Newton's law of cooling. The coffee has a temperature of 80°C when freshly poured, and 1 min later has cooled to 70°C, when the temperature outdoors is 0°C. (a) Write an initial value problem for this model. (b) Determine the time when the coffee reaches a temperature of 40°C. (Note: Begin the solution by stating your notation).

You are working as a land surveyor in Upington and decided to BUY a plot of land for yourself. You now measure the physical distance between two outer points on the plot with a steel tape on a day when the temperature is almost 45 degrees Celsius. You measure a distance of exactly 1000 m on this day with the steel measuring tape(a=1.2x10/K). You now decided to verify your data (i.e. the 1000 m distance) a month later when the temperature was now only 5 degrees Celsius using the same steel tape. a) Why do you think the steel tape will give a controversial answer in the cold weather? b) Explain (using words and a calculation) whether you expect to find a distance of more than 1000 m or less than 1000 m between the 2 poles at 5 degrees celsius. Maximum number of characters (including HTML tags added by text editor): 32,000 Show Rich-Text Editor (and character count) 12:55 |国 20°C Mostly sunny ENG 2021/10/29 DELL

A hollow cylinder has length L, inner radius R, and thickness d, and the temperatures at the inner and outer surfaces are Tn and Ti, respectively. The thermal conductivity of the material of which the cylinder is made is k. Derive an equation for the rate of heat transfer P through the walls of the cylinder. Simplify this equation assuming that the thickness of the cylinder d is much smaller than the its inner radius R.

The enthalpy of a system is given by the equation H=U+PV where U is the internal energy, P=pressure, and V=volume. In addition, the internal energy, U=Q+W where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.75 atm, what is the value when heat is absorbed by the system at a rate of 55 J/s and work is done by the system at a rate of 200 J/s when the change of volume is rated at 76 x 10^-5 m^3/s?  1. What is the change in heat with respect to time?2. What is the change in internal energy of the system with respect to time?3. What is the change in enthalpy of the system with respect to time?

You take an aluminum cylinder with a mass m = (315± 2) g out of a furnace at temperature T = (250 ± 5)C °and place it in a large bath of cool water. The final 1 temperature of the cylinder and water is T2 = (29 ±1) C° . How much heat flows from the cylinder to the water, and what are the absolute and relative errors in the heat transfer out of the cylinder? The heat transfer is given by Q = mc T ∆where ∆T is the change in temperature and c = (0.215± 0.005)cal/g C is ⋅t°he specific heat of aluminum.

In an experiment measuring the latent heat of fusion of water, the following procedure was followed. Ice cube of mass 35.0 g at an initial temperature of 0.0°C is dropped into 225.0 g of 65.0°C water in an aluminum container. The mass of the aluminum container is 44 .0 g and the final equilibrium temperature is 46.0℃. Determine whether any heat is lost or gained in this experiment to the environment. If yes, how much? (For water: c = 1.00 cal/g×°C and Lf = 77.9 cal/g; for Al: c = 0.215 cal/g×°C

In Figure (a), two identical rectangular rods of metal are welded end to end, with a temperature of T, = 2°C on the left side and a temperature of T2 = 117°C on the right side. In 3.2 min, 37 J is conducted at a constant rate from the right side to the left side. How much time would be required to conduct 37 Jif the rods were welded side to side as in Figure (b)? (a) (b) Number i Units

1. Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful. (a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.3 deg C compared with that at 33.5 deg C, such as on a person's skin? % Increase = % (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34 deg C compared with that at 20.3 deg C, such as for warm and cool automobile hoods? % Increase= %