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A baseball player catching a ball can soften the impact by pulling his hand back. Assuming that a 5-oz ball reaches his glove at 96 mi/h and that the player pulls his hand back during the impact at an average speed of 25 ft/s over a distance of 8 in., bringing the ball to a stop, determine the average impulsive force exerted on the player'shand.
a closed system consisting of 2lb of a gas undergoes a process during which the relation between pressure and volume is
In the limiting case of a very small sphere, what is the minimum value of the convection heat transfer coefficient expressed in terms of the sphere diameter and thermal conductivity of the air?
A centrifugal compressor has an impeller tip speed of 366 m/s. Determine the absolute Mach number of the flow leaving the radial vanes of the impeller when the radial component of the velocity at impeller exit is 30.5 m/s and the slip factor is .9. G..
In the two-shield configuration of part (a), the air gaps formed by the annular concentric tubes are L = 10 mm. Calculate the heat loss per unit length if the gap dimension is L = 15 mm. Do you expect the heat loss to increase or decrease?
Air at a stagnation pressure 700kPa flows isentropic ally through a convergent-divergent nozzle. The design pressure at the nozzle exit is 56 kPa. If the back pressure is raised gradually, thereby creating a shock in the divergent portion of the nozz..
A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temperature of 27°C. Assume constant specific heats at 300 K.
Define the term jig as used in production tools used to accurately manufacture and duplicate parts in a mechanical engineering laboratory
an air conditioner is used to cool and dehumidify air. we will ignore the temperature aspect and model the air
A solution with a boiling point of 180°F boils on the outside of a 1-in. tube with a No. 14 BWG gauge wall. On the inside of the tube flows saturated steam at 60 psia. The convective heat transfer coefficients are 1500 Btu/(h ft2 °F) on the steam ..
two bars are held together by 6 bolts. bar 1 has a modulus of e a cross-sectional-area of a and a length of l2. it has
a pressure transducer exhibits a temperature sensitivity of 0.05 units per degree celsius and a pressure sensitivity of
a cylindrical tank with its axis horizontal has a diameter of 2.0 m and a length of 4.0 m. the ends if the tank are
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