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1.47 Consider a carton of milk that is refrigerated at a tem- perature of Tm = 5°C. The kitchen temperature on a hot summer day is T00 = 30°C. If the four sides of the carton are of height and width L = 200 mm and w = 100 mm, respectively, determine the heat transferred to the milk carton as it sits on the kitchen counter for durations of t = 10 s, 60 s, and 300 s before it is returned to the refrigerator. The convection coefficient associated with natural convection on the sides of the carton is h = 10W/m2 · K. The surface emissivity is 0.90. Assume the milk carton temperature remains at 5°C during the process. Your parents have taught you the importance of refrigerating certain foods from the food safety perspec- tive. Comment on the importance of quickly returning the milk carton to the refrigerator from an energy con- servation point of view.
Make a drawing of the wooden pattern for the part, include all necessary allowances for shrinkage and machining - The spool will be lighter as a result of the redesign in part c) above. Estimate the decrease in weight.
A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. How much ener..
A spherical steel pressure vessel (diameter 480 mm, thickness 8.0 mm) is coated with brittle lacquer that cracks when the strain reaches 150 × 10-6 (see figure). What internal pressure p will cause the lacquer to develop cracks? (Assume E = 205 GP..
steam at 160 bar 520 degrees celsius and with a mass flow rate of 250 kgs enters a turbine operating at steady state
a ship channel has a depth of 16 m and an upper width of 16 m. the sides of the channel are curved such that the width
The magnitude of the horizontal(to the right) for F1 is 5kN and F1 + F2 + F3 = 0. What are the magnitude of F2 and F3?
a fire-fighting pumper truck is to deliver water at 1.5 ft3s to a maximum elevation of 60 ft above the hydrant. the
a mixture of nitrogen and carbon dioxide with a carbon dioxide mass fraction of 50 percent has a constant-volume
water is pumped at a rate of 1.57 cfs from one large open tank into another through a 6 in diameter cast iron pipe 400
We're asked to determine the deflection of a beam location for a 2000N load. However the force is directed up the corner NOT centroid.
A researcher working on a batch of a ceramic material tested two sets of samples for fracture strength. For one set of samples the specimens were tensile bars with a 10x10x100 mm^3 tensile gauge sections, and another set were bend bars of similar siz..
Outside air at 1 bar, 5 °C and RH 70% is heated to 25 °C. The flow rate of air is 50 m 3/min. Find (a) the final relative humidity, (b) the rate of heat transfer (in kW) needed to heat up the air?
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