Exercise 5.4 a horizontal wire with a mass per unit
length of 0.2 kg/m camies a current of 4 a...
Engineering, 14.12.2019 21:31 20009
Exercise 5.4 a horizontal wire with a mass per unit
length of 0.2 kg/m camies a current of 4 a in the
tax-direction. if the wire is placed in a uniform magnetic
flux density b, what should the direction and minimum
magnitude of b be in order to magnetically lift the wire
vertically upward? (hint: the acceleration due to gravity
is g=-19.8 m/s.)
ans. b = 90.49 t.
Answers: 3
Engineering, 04.07.2019 18:10, samanthabutryn
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
Answers: 3
Engineering, 04.07.2019 19:10, pedropaulofpedrosapp
Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?
Answers: 3
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