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A certain kind of brick has a density of 2000kg/m^3 and a compressive strenght of 40Mpa. What is the highest vertical parallel-walled tower that can be built that will not crush the bottom brick?
Determine the boundary work and the heat transferred to/from the refrigerant. (b) If the surroundings are at 15 psia and 75 degree F, determine the entropy generated by this process, the exergy dest
Determine the final temperature and volume if the exergy destruction is 15 kJ. Is the ammonia before or after this process an ideal gas?
Calculate the rate at which heat is transferred to/from the environment, the rate at which exergy is destroyed, and the reversible power.
What is the total energy released by burning the mass of the fuel (QH)? What is the maximum amount of work the engine can deliver (i.e. the energy output working at the Carnot efficiency)?
A dentist drill is driven by a small, high-speed turbine operating on compressed air which produces a shaft power output of 150W. What is the coefficient of performance of the refrigerator?
Considering the temperature and pressure of the air in the clearance space at the beginning of admission are 6.2 bar and 150 oC respectively, calculate the fraction of stroke travelled by the piston
Discuss whether it would be advisable to hot work or cold work the following metals and alloys on the basis of melting temperature, oxidation resistance, yield strength.
What are the reaction forces of a pendulum at the pivot point at angles 0, 45, and 90 from the horizontal. The pendulum consists of a rod (length=4m and mass= 11kg).
Find the ratio of the Earth's translational K.E to its (daily) rotational K.E. Assume the orbit about the sun is circular with a radius of 93 million miles.
The plate has a uniform temperature of 700K and has an emissive power of 5000 W/m^2. Determine the a) total emissivity b) absorptivity of the plate C) reflectivity also d) transmtivity.
A locomotive car of mass 2000 Kg traveling at a velocity v=10m/sec is stopped at the end of tracks determine the maximum displacement of the car after engaging the spring and damper.
This should produce saturated ammonia vapor at -20 C in the exit line. What is the mass flow rate in the second line and what is the total entropy generation in the process?
Calculate the compressibility factor at the sur-face of Venus. Also determine the volume of 10 kg of carbon dioxide vapor at the surfaceof Venus.
The initial temperature is 152o C. Air expands (as an ideal gas) from 10 bar and the above temperature to 1 bar in isothermal, internally reversible process. Determine the heat transfer and work do
What is the mass of one dart? The mass moment of a dart is I = md2where d is the distance from rotation center to dart.
The two smaller pulleys have identical masses of .031 sl and radii of 2 in. All pulleys are thin disks. What is the speed of (a) B and (b) A just before B hits the floor? Ignore friction.
How far has the mass moved when its velocity is 2.43 m/s? Friction exerts a constant moment of.32 Nm. Specs - Ring: m = 300 g, r = 7 cm Disk: m = 500 g, r = 9 cm.
The wheel radius is 46 cm and the height of the center of gravity of the girl above the ground is 75 cm. What is the average force of friction on the girl during the motion? Treat the wheels as thin
How much work must the motor do to stop the body when the arm is at 90 degrees to the horizontal? Assume the body does not rotate around its center of gravity.
A 98 kg log is being moved by placing it on two cylinders. When the log has a linear velocity of 2.76 m/s, a force defined by F = 1.2x3 is applied to the log. How far does the log move before coming
A moment of 12.5 Nm is applied to pulley A causing it to rotate through 68 radian. What are the final angular velocities of the three pulleys?
The hill has an elevation of 77 ft and an inclination of 4 degrees. What is the linear velocity of the wheel at the bottom of the hill?
Estimate, at the beginning and end of combustion the Mach number M2 at the downstream end of the grain The gas specific heat ratio and molecular weight are 1.2 and 20.
Determine the required stiffness k of the hydraulic stiffener such that the response amplitude C/fo of the connector does not exceed 2 during the jet engine power up.