A sample of a serum of mass 26.5 g is cooled from 290 K to 275 K at constant pressure by the extraction of 1.41 kJ of energy as heat. Calculate q and AH and estimate the heat capacity of the sample. report here the heat capacity= J/k.g. 3 sig. number
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- A body whose surface area is 0.2 m2, emissivity is 0.8, and temperature is 100°C is placed in a large, evacuated chamber whose walls are at 25°C. What is the rate at which radiation is emitted by the surface, in W? What is the net rate at which radiation is exchanged between the surface and the chamber walls, in W?Compute the heat transfer through the air condition if the outside temperature is outside temperature, To = 5 degrees Celsius, inside temperature = 20 degrees Celsius, in a room with length 5 m, width of 6 m and height of 4 m. A typical volume flow for ventilation is 20 liters/second or 0.02 cubic meter/s, how much time will it take to replace all air within this room? Then, compute total thermal power flux out of the room through the ventilation? Given, Cp = 1005 J/khK, and roho = 1.2 kg/cubic.If the initial temperature of the sample is 63.5°F, what is its temperature in degrees fahrenheit when the desired temperature increase has been achieved? (3 sig fig)
- Thermal energy is added to 180 g of water at a constant rate for3.5 min, resulting in an increase in temperature of 12 C°. What isthe heating rate, in joules per second?In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (−78.5°C) and in boiling pentane (36.1°C). The separate pressures are 0.898 atm and 1.436 atm. Hint: Use the linear relationship P = A + BT, where A and B are constants. (a) What value of absolute zero does the calibration yield? °C(b) What pressure would be found at the freezing point of water? atm(c) What pressure would be found at the boiling point of water? atmA 20.65 g of ice at -10°C was completely melted in 115.35 g of water with an initial temperature of 75°C. The final temperature of the melted ice and water is 52°C. If you are to compute for the value of the latent heat of fusion of the experiment, how much is the percent error compared to the theoretical value? specific heat of ice = 2090 J/kg∙K specific heat of water = 4186 J/kg∙K theoretical value of Lf = 334×103 J/kg A. less than 1% B. between 1% to 5% C. between 5% to 10% D. more than 10%
- An engineer who is working on the heat transfer analysis of a house in English units needs the convection heat transfer coefficient on the outer surface of the house. But the only value he can find from his handbooks is 22 W/m2·K, which is in SI units. The engineer does not have a direct conversion factor between the two unit systems for the convection heat transfer coefficient. Using the conversion factors between W and Btu/h, m and ft, and °C and °F, express the given convection heat transfer coefficient in Btu/h·ft2·°F.In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (-78.5°C) and in boiling ethyl alcohol (78.0°C). The separate pressures are 0.900 atm and 1.635 atm. (a) What value of absolute zero in degrees Celsius does the calibration yield? What pressures would be found at (b) the freezing and (c) boiling points of water? Hint : Use the linear relationship P = A + BT, where A and B are constants.The Specific Heat Capacity of Lithium is 3.56 J / g C. What is this Specific Heat Capacity using kilograms?
- In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (−196°C) and in boiling methyl alcohol (64.7°C). The separate pressures are 0.344 atm and 1.556 atm. Hint: Use the linear relationship P = A + BT, where A and B are constants. (a) What value of absolute zero does the calibration yield?? °C(b) What pressure would be found at the freezing point of water? ?atm(c) What pressure would be found at the boiling point of water? ?atmCharles’ law states that for a fixed mass of gas under constant pressure, the volume V and temperature T of the gas (in kelvins) satisfy the equation V = kT, where k is constant. Find an equation relating dV>dt to dT>dt.The quantity of energy Q transferred by heat conduction through an insulating pad in time interval Δt is described by Q/Δt = κAΔT/d, where κ is the thermal conductivity of the material, A is the face area of the pad (perpendicular to the direction of heat flow), ΔT is the difference in temperature across the pad, and d is the thickness of the pad. In one trial to test material as lining for sleeping bags, 86.0 J of heat is transferred through a 3.40-cm-thick pad when the temperature on one side is 37.0°C and on the other side is 2.00°C. In a trial of the same duration with the same temperatures, how much heat will be transferred when more of the material is added to form a pad with the same face area and total thickness 8.41 cm?