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The diffusion constant (Do) and activation energy (Q) of C in BCC Fe is 0.01 cm2/sec and 80kJ/mol respectively. In FCC Fe, the values are 0.21 cm2/sec and 148kJ/mol.
The total cross-sectional area of the inlet to the jet engines is 20 ft2. Assume that the flow properties of the air entering the inlet are those of the freestream ahead of the airplane.
Calculate the static thrusts of the rocket and turbojet engine described in the figure. The thrust T is the force necessary to prevent horizontal movement of the engine.
A simple U-tube manometer is installed across an orifice meter. the manometer is filled with mercury(specific gravity 13.6), and the liquid above the mercury is carbon tetrachloride (specific gravity
Consider some hypothetical X+ - Y - ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and - 6.22 eV respectively.
A wheel barrow is used to lift a 200 lb load. The length from the wheel axle to the center of the load is 2 ft. The length from the wheel and axle to the effort is 5 ft. 5. What is the ideal mechanica
An Industrial water shutoff valve is designed to operate with 30lbs of force and will encounter 200lbs of resistance force applied to a 1.5in diameter axle. What is the required actual mechanical adva
The 2.4m wide portion ABCD of an inclined, cantilevered walk-way is partially supported by members EF and GH. Knowing that the compressive force exerted by member EF on the walkway at F is 24.3kN, det
The 18 kg block starts from rest and moves upward when constant forces of 20 N and 40 N are applied to supporting ropes. Neglecting the masses of the pulleys and the effect of friction, determine the
A variable force and appropriate energy transfers are applied to the piston so that the water temperature remains constant as the water expands to a final volume of 14.303 m3.
A medical technician uses a pair of four inch long tweezers to remove a wood sliver from a patient. The technician is applying 1 lb of squeezing force to the tweezers.
A steam turbine is operated ith an input temp of 800C and exhaust temp of 150C. What is the maximum amount of work the turbine can do for a given heat input Q?
Two particles A and B start from rest at the origin s = 0 and move along a straight line such that aA = (6t-3)ft/s2 and aB = (12t2-8)ft/s2, where t is in seconds.
While studying physics in her dorm room, a student is listening to a live radio broadcast of a baseball game. She is 1.6 km due south of the baseball field.
A construction crew lifts approximantely 560lb of material serveral times during the day from a flatbed truck to a 32 ft rooftop. A block and tackle system with 50 lb of effort force is designed to li
A first class lever, in static equilibrium, has a 50lb resistance force and 15lb effort force. The lever’s effort force is located 4 ft from the fulcrum.3. Using static equilibrium calculations,
The rigid gate, OAB, of Fig. P2.58 is hinged at O and rests against a rigid support at B. What minimum horizontal force, P, is required to hold the gate closed if its width is 3 m?
Calculate the energy for vacancy formation in Al, given that the equilibrium number of vacancies at room temperature (25 °C) is 1.87 × 1016 m–3. The atomic weight and density for Al ar
The truck at B is used to hoist the cabinet up to the fourth floor of a building using the rope and pulley arrangement. The truck has a speed of vB = 2 ft/s, and is accelerating at aB = 0.6 ft/s2.&nbs
A weight attached to a spring of stiffness 525N/m has a viscous damping device. When the weight is displaced and released , the period of vibration is 1.80s, and the ratio of consecutive amplitudes is
A civil engineer must design a wheelchair accessible ramp next to a set of steps leading up to a building. The height from the ground to the top of the stairs is 2ft.
If the column's cross sectional area were uniform, the compressive stress at increasing distances x from the top would increase due the column's weight.
What is the magnitude and direction of the force that must be exerted by you on her? What is the magnitude and direction of the force she exerts on you?
Heat is now transferred to the refrigerant, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 180 kPa.
The coefficient of restitution is 0.9 between the two 60-mm-diameter billiard balls A and B. Ball A is moving in the direction shown with a velocity of 1 m/s when it strikes ball B, which is at rest.