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A closed, rigid tank fitted with a paddle wheel contains 0.1kgof air, initially at 300 K, 0.1MPa. The paddle wheel stirs the air for 20 minutes, with the power input varying with time according to W = -10t, where W is in watts and t is time, in minutes. The final temperature of the air is 1060K. Assuming ideal gas behaviour and no change in kinetic or potential energy, determine for the air
a) the final pressure, in MPa
b) the work, in kJ
c) the heat transfer, in kJ
the fluid used is r-134a. the flow of r-134a is 70 lbmmin. if r-134a enters a compressor at -10 deg f and is a
a bullet of mass 81gm and moving with a velocity of 300msec is fired into a log of wood and it penetrates to a depth of
R134a flowing at 12 m/s enters a 25 mm diameter tube at a quality of 15%, at 36 Celsius and exits the tube at 10 bars as a saturated liquid. Determine (a) the mass flow rate of the R134a in kg/s, (b) the velocity of the R134a at the exit in m/s and (..
determine the maximun concentrated load that can be applied at the midpoint of a 3-m simple span. Neglect the weight of the beam.
A radiator wall measuring 2 m by 3 m (WxH) is held a temperature of 125 °C. Straight aluminum fins (k = 175 W/mK) are to be mounted on the wall. The fins are 5 cm in length and 0.8 mm thick. The system is allowed to convectively transfer heat to ambi..
In a chemical plant liquid ammonia is stored in a large tank at 72 degrees F and 200 psig. Ammonia is pumped from this tank to a smaller tank for chemical process usage. The pump used to supply ammonia to the process tank is located 12 ft above the s..
The diameter of the sun is 1.39 x 106 km and is assumed to radiate with emissivity, e = 0.98, estimate its effective temperature. The distance between the sun and earth is about 1.495 x 108 km. The earth temperature is about 15 C. The solar constant ..
a 2-kw iron is left on the ironing board with its base exposed to the air at 25 degc. if the surface temperature is 500
A particle moves along a spiral described by the equation r=r(inital)+kappa*theta, where r(inital) and kappa are constants, and where theta is in radians. Assume that theta dot =alpha*time, where alpha= 0.15rad/s^2 and t is time expressed in seconds.
a 10-pitch 20-degree full-depth involute gearset with qv10 and a face width of 1.25 inches is being proposed to provide
steam flows through a horizontal adiabatic throttle which controls the flow to 25.0 ft3s and then through an adiabatic
a rod has a cross sectional area of 1 cm2. the material has the following strength characteristics beyond which the rod
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