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Suppose you are outside on a cold day with no gloves. Assume your hands have an area of 0.01 m2. The temperature of your hands is 36 C and the temperature outside is 0 C. a) If it is calm and the heat exchange coefficient is h = 5 W/m2· K , what is the rate of heat transfer in kJ/s from your hands? b) If it is windy and the heat exchange coefficient is h = 200 W/m2· K , what is the rate of heat transfer in kJ/s from your hands?
compute (a) the interplanar spacing for the set of planes and (b) the atomic radius for the rhodium atom.
a particle is moving along a straight line such that when it is at the origin it has a velocity of 8 ms part a if it
A layer of water seperates two smooth surfaces a distance of 2r. Derive an experssion for the force needed to pul the two surfaces apart. Consider the bottom surface fixed. What is the force needed to seperate the top surface?
determine the resultant internal normal force acting on the cross section through point of the signpost. the post is
air is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01 m2.
Determine the heat transfer coefficient for laminar flow over this cylinder. First, at your discretion, select an available set of experimentally obtained data from the literature. Then, this would provide you with a set of Reynolds numbers.
a vehicle starts from rest then moves rectilinear with a velocity of v 2t2 for 5 s until it reaches a velocity of 50
Male an Isometric Drawing of the V stop shown in Figure. Use a suitable scale to depict the view well on an A3 drawing duet.
two kg of saturated liquid water at 1 bar is compressed to 25 bar and 100degc in a water pump. determine the change in
a compressor is used to compress air from 1 bar and 290 k to 10 bar. the compression can be assumed to be adiabatic and
Drinking water at 10oC for an office complex must be pumped along a horizontal section of PVC pipe 50 m long at 2 m/s. The pipe has a nominal diameter of 62.5 mm and is Schedule 40. What is the head loss in m?
a hot dog can be considered to be a cylinder 12 cm long and 2 cm in diameter whose properties are rho 980 kgm3 cp 3.9
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