Physics, 15.06.2020 09:57, katdoesart65091
The frame shown consists of a steel beam welded rigidly to two vertical channels . An eccentric exciter weighing 350 N is attached to the beam , which weighs 15 KN and is used to excite the frame . The unbalance weight of the exciter is 30 N and it has an eccentricity of 7 cm . By varying the rotational speed of the exciter until resonance occurs , the maximum horizontal amplitude was found to be 5 mm . Assuming no bending on the beam and considering the channels to be completely fixed at C and D ( see Figure ( 1 ) ) , determine , ( a ) The natural frequency in Hz . ( b ) The damping factor . ( c ) The magnification factor at resonance . ( d ) Discuss whether this values in ( a ) , ( b ) and ( c ) are better for the structure if it is high or low .
Answers: 2
Physics, 21.06.2019 21:20, mmaglaya1
Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market
Answers: 3
Physics, 22.06.2019 01:10, caguil00
Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)
Answers: 3
Physics, 22.06.2019 07:40, bellapimienta8
Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents
Answers: 2
The frame shown consists of a steel beam welded rigidly to two vertical channels . An eccentric exci...
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