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A domestic food freezer maintains a temperature of - 15°C. The ambient air temperature is 30°C. If heat leaks into the freezer at the continuous rate of 1.75 kJ/s what is the least power necessary to pump this heat out continuously.
Air at 14.7 psia, 50°F (DB), and 60% relative humidity is first heated to 72°F (DB) and then humidified by introducing water vapor (“steam”). The air leaves the humidifying section at 75°F (DB) and 55% Relative Humidity. Plot the process on a Psychro..
What outer sphere diameter is required so that the convection heat transfer from the inner sphere is the same as if it were placed in a large, quiescent environ- ment with air at Too = 20°C?
an aqueous ester hydrolysis reaction a -gt b c has k 0.02 min-1 and an equilibrium constant of 10 with all
Derive Taylor series expansion of f(x) = cosine(x) about the point x = 0. Write out the expression to the 6th term and then write a general expression for it for any order of Taylor series.
What impact would collecting recyclables one week and collecting green waste the next week have on the recycling rate?
a 50-mg railroad car moving with a velocity of 3 kmh is to be coupled to a 30-mg cae which is at rest determinea the
A particle which movies in a two-dimensional curvilinear motion has coordinates in millimetres which vary with time t in seconds according to x=5t2 +4 and y=2t3 + 6. For time t =3s, determine the radius of curvature of the particle path and the magni..
the annual growth rate of energy utilization in the world was 2.5 per year in 2011. how long would it take to consume
What is the inner tube surface temperature at the outlet, where fully developed conditions may be assumed?
A fishnet is made of 1-mm-diameter strings knotted into 2x 2 cm squares. Estimate the horsepower required to tow 300 ft2 of this netting at 3 kn in seawater at 20°C. The net plane is normal to the flow direction.
An 80-lb weight falls through 5 ft and is then caught at the end of a wire rope 90 ft long having a cross-sectional area of 0.5 in.2. Find the maximum dynamic stress in the rope, assuming E = 15 × 106 psi.
the concentration of silicon in an iron-silicon alloy is 0.55 wt. what is the concentration in kilograms of silicon per
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