(1) Suppose a person is covered head to foot by wool clothing with average thickness of 2 cm and is transferring energy of 6000 joules by conduction through the clothing for 2 minutes. What is the temperature difference across the clothing, given the surface area is 1.4m2? (Given: Thermal conductivity of wool is 0.04 W/mK) The difference in temperature =
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- As the very first rudiment of climatology, estimate the temperature of Earth. Assume it is a perfect sphere and its temperature is uniform. Ignore the greenhouse effect. Thermal radiation from the Sun has an intensity (the "solar constant" S) of about 1370 W/m2 at the radius of Earth's orbit. (a) Assuming the Sun's rays are parallel, what area must S be multiplied by to get the total radiation intercepted by Earth? It will be easiest to answer in tens of Earth's radius, R. (b) Assume that Earth reflects about 30% of the solar energy it intercepts. In other words, Earth has an albedo with a value of A=0.3 . In terms of S, and R, what is the rate at which Earth absorbs energy from the Sun? (c) Find the temperature at which Earth radiates energy at the same rate. Assume that at the infrared wavelengths where it radiates, the emissivity e is 1. Does your result show that the greenhouse effect is important? (d) How does your answer depend on the area of Earth?An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.I want the calculation for this expiremnt Note: the unit of thermal conductivity w/m.k
- 40000cm, and at 1000C its length is 40060cm. (a) What is the linear expansion coefficient of the alloy? (b) what is the temperature when its length is 39975cm? (10) A hole with diameter of 2cm is drilled through a stainless steel pate at room temperature (20OC). By what fraction (Dr/r) will the hole be larger when the plate is heated to 1500C? (11) Calculate the fractional change in volume (Dv/v) of an aluminum bar that undergoes a change in temperature of 300C.A sphere of radius 4.3 mm is at 3499 K. Calculate the rate of radiation of energy (in W) by the sphere, if its emissivity is 1.gas Lab 11 Instructions: Specific Heat Due: See Course Schedule eesm et elsluols mo nuoy b.e The density of iron is PFe €7.87g/cm3. Calculate the mass of the drilo diansb erT iron cube using the definition of density: p= m/V. Show your calculation. 10cm^3 10X10 x10 X 7.87 1.39/cm 3 7,810 gms Answer: こ take mass : by volum e mass - volum ecc (cm³) こ1 mome erlt sisidile erlt ec. woThe density of brick is pbr = 1.92g/cm³. Calculate the mass of the sriw wole brick cube using the definition of density: p = m/V. Show your pnnuas calculation. omme er euld en T0Answer: xac Massco = 1.42 x 10 cm Icm 3 1.9 Zg eignsit er = 19.2 19.2g こ d. The water and the oil are both in beakers which have a 3-liter capacity. Each of the major tick marks on the beaker is 1 liter, elsidile and each minor tick mark i6 0.2 liters. Examine the beakers and ut6ied determine the volume (in ml) of each liquid. (There are 1000 ml 1000mL= IL in one liter, and that 1 ml = 1 cm³.). hdml lcm3 ierine Answer:uteTegnmet eid) ho…
- What must be the height of a 200mm diameter vertical pipe carrying hot liquid so that the surrounding area becomes 38degrees C? Note that the rate of convection is 6 KWatts and the surface of the plate is around 90degrees C. answer in meters. (3 decimal places)2.4. (a) A block of copper at a pressure of 1 atm (approximately 100 kPa) and a tem- perature of 5°C is kept at constant volume. If the temperature is raised to 10°C, what will be the final pressure? (b) If the vessel holding the block of copper has a negligibly small thermal expan- sivity and can withstand a maximum pressure of 1000 atm, what is the highest temperature to which the system may be raised? (Note: The volume expansivity ß and isothermal compressibility k are not always listed in handbooks of data. However, ß is three times the linear expansion coefficient a, and k is the reciprocal of the bulk modulus B. For this problem, assume that the volume expansivity and isothermal compressibility remain practically constant within the temperature range of 0 to 20°C at the values of 4.95 × 10-5 K-1 and 6.17 x 10-12 Pa-!, respectively.)When lead is melted at atmospheric pressure, the melting point is 327 ° C, the density decreases from 1.101 × 104 to 1.065 × 104 kg m-3 and the latent heat is 24.5 kJ/kg. Estimate the increase in melting point of lead, T (in K), at 76 atm.
- The operating temperatureof a tungsten filament in an incandescent light bulb is 2450 K, and itsemissivity is 0.350. Find the surface area of the filament of a 150 Wbulb if all the electrical energy consumed by the bulb is radiated by thefilament as electromagnetic waves. (Only a fraction of the radiation appearsas visible light.)Given a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current HC, Ans = (3) Temperature gradient AT/Ax, Ans = (4) Temperature T of the Cu bar 0.5 m from the hot end, Ans in W in C/m in K/W in CGiven a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current Hc, Ans = in W in K/W