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The density of seawater can be taken to be 1025 kg/m3, and the specific heat capacity to be 4 kJ/kg?K. The gravitational acceleration is 9.81 m/s2.
A certain superinsulation material having a thermal conductivity of 2 x 10^-4 W/m.C is used to isulate a tank of liquid nitrogen that is maintained at -196 degrees celcius; 199 kj is required to vap
A force of 12000 lbf was required for rock failure, and the cross-sectional area of the sample was 2.0 sq in. the sample failed along a plane that marks a 350 angle with the direction of compression
A thin layer of oil (of absolute viscosity = 0.40 N-s/m2) separates the plate from the table. To limit the shear stress in the oil layer to 1 kPa, what must the thickness of the oil film be (mm)?
A small radiant heater has a metal strips 6 mm wide with a total length of 3 m. The surface emissivity of the strips is 0.85. To what temperature must the strips be heated if they are to dissipate 2
An object weighs 275 N when fully immersed in water and 325 N when fully immersed in oil of specific gravity 0.9. Determine the volume of the object (in m3).
A mass m is suspended from a spring of stiffness 4000N/m and is subjected to a harmonic force having amplitude of 100N and frequency 5 Hz.
Two infinite black plates of 600 and 100 degrees celcius exhange heat by radiation. Calculate the heat transfer rate per unit area. if another perfectly black plate is placed between the 600 and 100
The still is supposed to produce a distillate containing 75 mol% benzene. For each of the following procedures, calculate, if possible, the number of moles of distillate per 100 moles of feed. Assum
A 5 cm layer of insulation with thermal conductivity of 0.06 W/m.C is placed between two plates of 100 and 200 degrees celcius. Calculate the heat transfer across the layer.
A truncated cone 20 cm high is constructed of aluminum. The diameter at the top is 8 cm, and the diameter at the bottom is 12cm. The lower surface is maintained at 100 degree celcius; the upper surf
If the allowable shear stress in the bolt is 13,000 psi, what is the minimum required diameter d(min) of the bolt at C?
Determine for the cycle the mass flow rate of steam entering the first stage of the turbine and the rate of heat transfer to the working fluid passing through the steam generator.
Energy from a high-temperature reservoir at 750 K flows at a rate of 2.1 kW to a heat engine. If the engine rejects heat to a low-temperature reservoir at 300 K, what is the maximum possible power
A house is losing heat at a rate of 2700 kJ/h per Celsius temperature difference between the indoor and the outdoor temp. Express the rate of heat loss from this house per a.) K b.) F and c.) R diff
A steel rod of 4m length is attached at both ends at 30 degree C. The coeff of thermal expansion is 11 * 10^-6 % and MOE is 2 * 10^5 kg/cm^2. If temp is changed to 18 degrees C find the stress at t
Determine head loss and the power required to overcome it given efficiency 73%, power of the pump 12hp, height 35ft, water, a flow rate of 1.2 ft^3/s.
Atmospheric air at 300K and 100kPa is to be delivered to a line at 600K, 200kPa. Two possible schemes for doing this are suggested. The first scheme involves reversible adiabatic compression and the
When a potential difference of 144 V is applied to the plates of an air-filled parallel-plate capacitor, the plates carry a surface charge density of 3.10 times 10-10 C/cm2.
To account for water losses in the cooling tower, part of the effluent from a nearby municipal wastewater treatment plant will be used as makeup water.
Specifically for this problem consider saturated water vapor at 400°F that is heated at constant pressure until its volume is doubled. Find the final temperature using the three methods noted a
Air at 50 psia and 90 F flows at the rate of 1.6 lbm/s through an insulated turbine. If the air delivers 11.5 hp to the turbine blades, at what temperature does the air leave the turbine?
Determine (a) the average force at the wheels of the cab, (b) the average force in the coupling between the cab and the trailer.
Air at -55 F, 4 psia, and M=2.5 enters a constant area isentropic process and leaves the isentropic process at M=0.2 Assuming a calorically perfect, ideal gas determine. The density (lbm/ft^3) of th
A bathroom door, which is 0.91 m wide and 2.13 m high, is equipped with a torsional spring and a torsional (rotational) viscous damper so that it automatically returns to its closed position after b