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The United States consumes 3,749,846 thousand megawatt hours each year. Assuming all of that energy was dumped to the earth's atmosphere instantaneously. How thick (i.e. altitude-wise) would the atmosphere have to be in order to have a temperature rise of no more than 0.5 C? Assume all of the atmosphere is at 15 C and 101.33 kPa. Assume constant specific heats at 300 K & neglect any boundary work.
when a brass specimen initially .505 in in diameter is tested the maximum load of 12000lbs was recorded at an
suppose the rate of growth of a bacterial population n cellsliter is described by dndt kn -1000. the terms represent
determine the smallest allowable value of the coefficient of static friction between the collar and the rod if the collar is not to slide when a) a =15° b)a = 45°. Indicate for each case the direction of the impending motion.
the rigid plate shown in figure was observed to rotate 1.2? from the vertical plane due to the action of the external
a frictionless poston-cylinder device initially contains air at 100 kpa and 0.15m3. at this state a linear spring f
a copper sheet of thickness 2l2mm has an initial temperature of ti118c. it is suddenly quenched in liquid water
the flow rate of air ar standard conditions in a flat duct is to be determined by installing pressure taps across a
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below.For k=1.4 Cv=0.718kJ/(kg*k), and Cp= 1.005 kJ/(kg*K)
an automobile tire with a volume of 0.5m3 is inflated to a gage pressure of 200 kpa. calculate the mass of air in the
on the apollo 14 mission to the moon astronaut alan shepard hit a golf ball with a golf club improvised from a tool.
molecules that are of density row180 kgm3 and spe- cific heat cp 3000 jkg k have an initial relaxed length of l2nm.
nitrogen with a mass of 4.4 lb is contained in a closed rigid tank at 27 degree c. work and heat are transferred to the
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