Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar
Decreasing the modulus of elasticity of the bar
All of these
Decreasing the cross-sectional area of the bar

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Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the top of the tooth
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface

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