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Compute the delivered heating cost ($/MMBtu) for coalfired heating units (i.e., furnace, boiler) based upon a heating value of 18 100 000 Btu/ton and a cost of $150/ton.
a. For an older, low-efficiency unit with a seasonal efficiency of 65%.
b. For a modern, middle-efficiency unit with a seasonal efficiency of 80%.
The figure shows a weapon called a battering ram (modern large battering rams are typically mounted on armored vehicles). The ram has weight Wr=2590 lb, center of mass at E, and radius of gyration kE=6.4 ft. Also let the distance between points A a..
Electric field of infinite surface. Calculate the electric field intensity in free space at a distance d above an infinite plane charged with a uniform surface charge density p,. Show that the electric field intensity is independent of d and pe..
at the instant shown the angular velocity of the 6kg bar is 10radsec counterclockwise and its angular acceleration is
A 2.4-N force is applied to the plunger of a hypodermic needle. If the diameter of the plunger is 1.3 cm and that of the needle 0.20 mm,
A vapor-compression refrigeration system, using ammonia as the working fluid, has evaporator and condenser pressures of 30 and 200 lbf/in.2, respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop.
during a test of a metal bar it was found that an axial tensile force of 10000 lb resulted in an elongation of 0.023
H2O at 50 kPa and 200 degrees C is compressed in a reversible, isothermal process with steady flow until it exists as a saturated vapor. Find w, q, and draw on a t-s diagram and p-v diagram
an aqueous ester hydrolysis reaction a -gt b c has k 0.02 min-1 and an equilibrium constant of 10 with all
a dam spillway is tested with a 130th scale model matching the froude number. the flow over the dam has an average
a balloon behaves so the pressure is p c2v13 c2 100 kpam. the balloon is blown up with air from a starting volume of
What is the current factor of safety against a quick condition at A‘? (The FS is defined as the ratio of the critical gradient to the existing gradient).
the drinking water needs of a residential hall with 20 students is to be met by a bubbler type water fountain. the
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