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Stone mix concrete slabs are used to absorb thermal energy from flowing air that is carried from a large concentrating solar collector. The slabs are heated during the day and release their heat to cooler air at night. If the daytime airflow is characterized by a temperature and convection heat transfer coefficient of T infinity = 200 degrees celcius and h= 35 w/m^2 K, respectively, determine the slab thickness 2L required to transfer a total amount of energy such that Q/Qo = 0.90 over a t= 8-h period. The initial concrete temperature is Ti=40 degrees celcius.
During the process, the pressure and specific volume are related by pv = constant. For the refrigerant, determine the work and heat transfer per unit mass, each in KJ/kg.
Centrifugal Clutch Question, In a centrifugal clutch there are eight shoes, each of mass 0.3 kg and the centre of gravity of each shoe is at 50 mm radius when it is just touching the drum of diameter 200 mm.
The link BD is a single solid bar with a width x thickness measuring 1.000 in. x 0.50 in. If the pins at A, B and D have a diameter of 0.375 in, determine the average normal stress in link BD when:(b) Fx = 0 and Fy =4.00 kips.
2 kg of water is contained in the vertical frictionless piston cylinde device.the mass of the piston is such that the
does the atmospheric pressure inside of a tube aproximately a half an inch in diameter cause resistance against an end
during this process heat is exchanged with surrounding such that the entire air remains at 30 degree celsius at all times.determine the heat transfer for this process.
a 1 foot square 14 inch thick piece of oak floats in a large pool of water. the convective heat transfer coefficients
Gear A rotates with an angular velocity of 100 rpm clockwise. Knowing that the angular velocity of arm AB is 50 rpm counterclockwise, determine the corresponding angular velocity of gear B.
How many times more ignition energy is required to achieve ignition of a fuel-air mixture at sea level with T = 298 K than at altitude of 6000 m where pressure P = 47,166 Pa and T = 248 K?
problem 1a plane stress element is subjected to stress componentssigmax 50 mpa sigmay -10 mpa and tauxy 40 mpa.1
the 2 Mg car increases its speed uniformly from rest to 25 m/s in 30s up the inclined road. determine the maximum power that must be supplied by the engine, which operates with an efficiency of 0.8. also, find the average power supplied by the eng..
readeachquestioncarefully.remembertoexplainyoursolutionasyougosincedesignproblemscanbesolvedinanumberofways.itisacceptab
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