12 A copier is connected to circuit LA-1. A microwave is connected circuit LA-3. These two circuits share
a neutral. The copier should draw 13.2 amps at 120 volts. The microwave is rated to use 1900 watts at
120 volts. Circuits LA-1 and LA-3 originate in a 120/240-volt, 10,3-wire panelboard. If the neutral is
disconnected from the neutral bar while the equipment is operating, there will be ___volts applied to
the microwave.
b. 120
c. 56
d. 128
e. 184
a. 112

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.