Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm
3.0 mm
2.50 mm
2 mm

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

All of these
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

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