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A copper ball with a diameter of 2 cm is removed from an oven at a uniform temperature of 200°C. Upon removal from the oven, it is subjected to a flow of air at 1 atm and 20°C with a velocity of 8 m/s for a certain period of time so the surface temperature of the ball drops to 100°C. Determine (a) the average convective heat transfer coefficient; (b) the duration of the cooling process.
a centerfielder throws a baseball 250 ft from the back wall to second base. it takes 2.84 seconds to reach the base.
a criticalcomponent of the death copter is a solid circular synchronizing shaft that is 4 inches in diameter and
a weather ballon is launched into the atmosphere by meteorologists. when the balloon reaches an altitude where is is
0.5 kg of water initially at 300 kpa 200oc is compressed in a piston-cylinder assembly to 1500 kpa 210oc. if heat
Assume Complete combustion write out a stoic metric equation for 1 mole of an arbitrary alcohol Cx Hy Oz determine the number of moles of air required to burn 1 mole of fuel?
a mass of 3kg of nitrogen at 100kpa and 20oc is contained in a piston-cylinder device. it is now expanded to a final
Two collars C and D move along the vertical rod as shown. Knowing that the velocity of collar C is 50 in/s downward, find the instant centers of all three bars, the angular velocity of AB, the velocity of collard D.
specifications for steel plate to be used in the construction of a certain bridge call for the minimum yield to be
assuming a constant concentration gradient and constant number of atoms at the surface calculate the approximate
a team of astronomers have proposed io construct a large parabolic telescope mirror by spinning a cylindrical container
one part of the tank contain 2.5 kg of compressed liquid water at 60 C and 600 kPa while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. Determine the final temperature of the water and the..
A power cycle operates between hot and cold reservoirs at 500 K and 310 K. At steady state the cycle develops a power output if 0.1 MW. Determine the minimum theoretical rate at which energy is rejected by heat transfer to the cold reservoir in MW
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