Part B: The ends of a 24 cm long, 2.6 cm diameter rod are maintained at -5°C and 99.4°C by immersion in a cold and hot liquid bath. If the Heat is conducted through the rod are at 45 KJ per hour. Calculate the, a) area of the rod in m² = b) temperature gradient (dT/dx) in Kelvin / m : c) thermal conductivity of the rod in W/m °C :
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- A mercury thermometer still in use for meteorologyhas a bulb with a volume of 0.780 cm3and a tube for the mercury to expand into of inside diameter 0.130 mm. (a)Neglecting the thermal expansion of the glass, what is thespacing between marks 1 °C apart? (b) If the thermometeris made of ordinary glass (not a good idea), what is thespacing?One of the windows in a house has the shape of a square 1.0 m on a side. The glass in the window is 0.50 cm thick, andhas a coefficient of thermal conductivity of k = 0.84 W>1m # K2. (a) How much heat is lost through this window in oneday if the temperature difference between the inside and outside of the window is 21 C°? (b) Suppose all the dimensionsof the window—height, width, and thickness—are doubled. If everything else remains the same, by what factor doesthe heat flow change?Suppose you stand with one foot on ceramic flooring and one foot on a wool carpet, making contact over an area of 55 cm2 with each foot. Both the ceramic and the carpet are 2.2 cm thick and are 10.5°C on their bottom sides, where they make contact with the floor underneath. A.)At what rate, in watts, must heat transfer occur from your foot to keep the top of the cermaic at 33*C? B.) At what rate, in watts, must the heat transfer occur from your foot to keep the top of the carpet at 33*C?
- Suppose a person is covered head to foot by wool clothing with an average thickness of d = 1.95 cm and is transferring energy by conduction through the clothing at the rate of Q / Δt = 45 W. What is the temperature difference, in terms of the quantities given in the problem statement, across the clothing? Denote the surface area of the wool by A and the thermal conductivity by k.A bilayer polymer swab (1.2 m long, 1.4 m wide, 5 cm thick) is placed on a hot plate,?which keeps the side of the slab touching the hot plate at 105 deg C. The thermal conductivity of layer 1 (2cm thick) is 0.44 W/ m-K and the thermal conductivity of Layer 2 ( 3cm thick) is 0.67 W/m-K. If the air surrounding the slab is 27 degree C and the convective heat transfer coefficient between the top of the slab and the air is 19W/m^2-K. What is the rate of heat transfer from the side of the slab touching the hot plate to air?1. The temperature on a warm summer day is95°F. What is this temperature:a. in degrees Celsius?b. on the absolute (Kelvin) scale? 2. How much heat must be removed from a 200-gblock of copper to lower its temperature from150°C to 30°C? The specific heat capacity ofcopper is 0.093 cal/g·C°. 3. The volume of an ideal gas is increased from0.8 m3to 2.4 m3 while maintaining a constantpressure of 1000 Pa (1 Pa = 1 N/m2). How muchwork is done by the gas in this expansion?
- *P- Please I want solutions of these questions in urgent basis. Thanks Suppose you stand with one foot on ceramic (k=34 W/mK) flooring and one foot on a wool carpet (k =0.02 W/mK), making contact over an area of 95cm2 with each foot. Both the ceramic and the carpet are 3.4 cm thick and are 9°C on their bottom sides. If the top of the ceramic and carpet at 30°C, calculate the following: a) the rate of heat transfer that occur from the foot kept on wool carpet in watts b) the rate of heat transfer that occur from the foot kept on ceramic in wattsThe bottom of an aluminum pot is 0.01 m thick and 0.1 m2in cross-section. The lower surface is kept at a temperature of 130℃, and the upper surface at 80℃. (a) How much heat per second is conducted throughthe bottom of the aluminum pot? (b) If the pot contains 2 kg of water at 30℃, how long will it take to bring the water to a boil?A copper bar of thermal conductivity 401 W/(m·K) has one end at 122°C and the other end at 24°C. The length of the bar is 0.110 m and the cross sectional area is 1.0x10-6 m2. (a) What is the rate of heat conduction along the bar? (b) What is the temperature gradient in the bar? (c) If two such bars were placed in series (end to end) between the same temperature baths, what would script p be? (d) If two such bars were placed in parallel (side by side) with the ends in the same temperature baths, what would script p be? (e) In the series case, what is the temperature at the junction where the bars meet?
- During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00ºC . What is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its density is 1050 kg/m? (answer in W)A heavily insulated copper rod or diameter 2 cm and length 25 cm is used to pipe heat between two objects. If the rate of heat transfer is 100 W and the hot object has a temperature of 50oC, what is the temperature of the cold object in oC?A wooden sphere of diameter 5 cm is initially at a uniform temperature of 21 °C. Its surfacetemperature is suddenly raised to 83 °C. The thermal conductivity and thermal diffusivity ofthe wood are 0.15 W/m K and 0.82 x 10-7 m2/s, respectively.a) Calculate the temperature 2 cm beneath the surface of the sphere 30 min after thesudden increase in temperature.b) Calculate the energy gained by the sphere during this time.