$5.$ True or False: Influence coefficients in rotor balancing are calculated based on the rotor's response to known imbalance trials.

$6.$ True or False: The addition of dampers to a mechanical system can eliminate the need for other types of balancing.

$7.$ True or False: The correct firing order can significantly reduce vibrations in multi$-$cylinder engines.

$8.$ True or False: V$-$engines and inline engines require the same balancing techniques due to their similar designs.