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A machine, modeled as a linear spring-mass-damper system, is driven at resonance (ωn = ω = 2 rad/s).
Design a damper (that is, choose a value of c) such that the maximum deflection at steady state is 0.05 m. The machine is modeled as having a stiffness of 2000 kg/m, and the excitation force has a magnitude of 100 N.
The crate shown is held against wedge B by a spring. The spring is 94.5% of its original uncompressed length l=2.75m, and the spring constant is given as k=1650N/m. The coefficient of static friction at all contacting surfaces is ?s=0.130. The mass o..
a light inelastic string of length 1.5m fixed at one end carries a particle p of mass 4 kg at the other end. if the
during a certain movie on cavitation dr. kavi tae shun held in his hand a closed cylinder filled with water and air. he
A 40-mm-long, 2-mm-diameter pin fin is fabricated of an aluminum alloy (k = 140 W/m · K). (a) Determine the fin heat transfer rate for Tb = 50°C, Too = 25°C, h = 1000 W/m2 · K, and an adiabatic tip condition.
a game consists of tossing disks onto a table marked in squares of side a. if the disk does not touch any line or edge
a supertanker is 360 m long and has a beam width of 70 m and a draft of 25 m. estimate the force and power required to
The hot gas flows across the pig at about 2 m/s. If the meat is cooked when it reaches 95?C, and if it is to be served at 2:00 pm, what time should cooking commence? Assume Bi to be large, but note Problem 7.40. The pig is initially at 25?C.
the rotor shaft of a helicopter drivesd the rotor blades that provide the lifting force and is subjected to a
for temperatures between 300 and 1000 k and at 1 atm the molar specific enthalpy of o2 is expressed by the following
At a given section a shaft is subjected to a bending stress of 20 MN/m2 and a shear stress of 40 MN/m2. Determine: the directions of the principal planes
At steady state, a heat pump provides energy by heat transfer at the rate of 25,000 Btu/h to maintain a dwelling at 708F on a day when the outside temperature is 308F. The power input to the heat pump is 4.5 hp. Determine
1. Solve Problem 8.109a using the effectiveness-NTU method.
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