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A car traveling at highway speed (assume 60 miles per hour, 1 mile = 5,280 ft) must overcome a drag force of approximately 62 lbf. If a gasoline-powered car has a highway fuel economy rating of 30 miles per gallon, and gasoline has a chemical energy content of 114,000 Btu/gallon, determine the rate of entropy generation (i.e. irreversibility) assuming the ambient temperature is 70 °F. You may neglect the combustion products (exhaust) in your analysis. Your result should be in units of Btu/hr-°R.
a system that operates in a reversible cycle receives energy by heat transfer from a 24.8oc reservoir at a rate of 25.5
liquid propane c3h8 enters a combustion chamber at 25 c at a rate of 1.2 kgmin where it is mixed and burned with 150
a single-pane glass window is used in a heated dwelling. outside the dwelling the ambient temperature is 0degc while
for an undamped sdof spring mass system m5kg and k2000 nm. plot the displacement and acceleration of the system using
a 6 lb collar is constrained to travel along a frictionless vertical ring of r3 ft. the spring is attached to the
a steady-flow compressor is used to compress helium from 15 psia and 70of at the inlet to 200 psia and 600of at the
a 5 ft3 tank containing steam at 14.7 psia 1 quality is fitted with a relief valve. heat is transferred to the tank
the heat flux passing through a plane wall of a well-insulated house is q 2.5 btuhr-ft2 when the temperature of the
Important information about Multipal choice question on mechanics, A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?
Describe the kutta condition.
a solid cylinder of mass 5 kg and radius of 0.1m is released from on a ramp and rolls without slipping. if height of
The 10-kg block rests on the platform for which = 0.4. If at the instant shown link AB has an angular velocity = 2 rad/s, determine the greatest angular acceleration of the link so that the block doesn't slip.
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