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A body is projected vertically upwards with speed u and moves under uniform gravity in a medium that exerts a resistance force proportional to the fourth power its speed and in which the body's terminal speed is V.
Find the maximum height above the starting point attained by the body. Deduce that, however large u may be, this maximum height is always less than πV2/4g.
a 2-m3 rigid tank initially contains air at 100 kpa and 22 degrees c. the tank is connected to a supply line through a
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 quick..
a 45.6-kg girl is standing on a 141-kg plank. both originally at rest on a frozen lake that constitutes a frictionless
a car tire pressure is 2.2 bar at 25 c. if the temperature drops overnight to 5 c and if the atmospheric pressure is 1
The power output of an ideal, open-cycle gas turbine cycle is 75 MW and its pressure ratio is 16. Air enters the compressor at 520 R and enters the turbine at 2800 R. Using variable specific heats at 1000°F: cp = 0.263 Btu/lbm-R and k = cp/cv = 1.353..
an air conditioner using r-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycle
a particle initially located at the origin has an acceleration of 2.6 ms2 and an initial velocity of i 5.3 ms.a find
A heater exchanger uses 6 kg/s cold water at 10 C in a counter-flow heat exchanger to cool a hot glycerine (cp = 2.05 kJ/kg-K) stream that enters at 300 C at a rate of 10 kg/s. If the water exits the heat exchanger at 50 C. find the rate of heat tran..
A work center consists of 4 machines each working a 16-hour day for 5 days a week. What is the weekly available time?
water with a quality of 70 is contained in a cylinder with a weight on a piston that maintains a water pressure of 500
A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH = 600 K and the isothermal compressions occurs at TC = 300 K.
determine the actual and minimum theoretical operating costs, each in $/day.
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