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An airplane wing modeled as a spring-mass system with natural frequency 40 Hz is driven harmonically by the rotation of its engines at 39.9 Hz. Calculate the period of the resulting beat.
steam enters a two-stage adiabatic turbine at 8 mpa and 550ordmc state 1 and is expanded to 2 mpa state 2 in the first
u.s. energy use was approximately 100 quads quadrillion btu in 2008. about 85 of this energy was supplied by burning
baseline validationdetermine the natural frequencies of the system-for the baseline systemdesign modificationnotice
A 10-ft long rectangular ASTM Grade 50 steel plate 1-in by 12-in cross section is used as a hanger and is subjected to a tensile load of 240,000 lb . the modulus of elasticity for steel is 30,000,000 psi and the poison ratio is 0.25
Draw a force diagram and obtain a differential equation for ω. This equation is quite simple and can be solved either by inspection or by formal integration.
starting from rest a cart is propelled by an hydraulic cataputlliquid jet. the jet strikes the curved surface and makes
A 90 kg pilot ejects from a plane and reaches a steady state velocity of 30 m/s with one parachute open. Neglect any air drag force on the pilot and assume that the air drag force can be modeled as an ideal damper i.e. linearly proportional to the ve..
Consider a cantilever beam, having negligible mass and uniform flexural rigidity, with length 0.01 m. The frequency of vibration of the beam, with a 0.5 kg mass attached at the free tip, is 100 Hz. The flexural rigidity (in N.m2) of the beam is..
Hookes Law (Stress equals Young’s Modulus times Strain; or s=Ee) is valid for both linear tensile behaviour and torsion (or shear) as well (e.g. t=Gg). Imagine a shear test of annealed, mild steel (e.g. AISI 1020). It is sheared until it just starts ..
In a reheat rankine cycle, steam enters the turbine at 4 MPa and 400 C. After expanding to 400 kPa, the steam is reheated again to 400 C, and expands in the low pressure turbine to 10 kPa. If the efficiency of the turbine and the pump is 100% and the..
Water is boiled at 300 kPa pressure in a pressure cooker. The cooker initially contains 3 kg of water. Once boiling started, it is observed that half of the water in the cooker evaporated in 30 minutes.
A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..
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