$39.$ True or False: The Prony brake is an ancient design that is no longer used in modern engineering.

$40.$ True or False: Internal expanding shoe brakes are used in most modern vehicles' wheel brakes.

$41.$ True or False: The pressure applied in an internal expanding shoe brake does not affect the braking torque.

$42.$True or False: Torsion dynamometers are invasive and require significant modification of the system for installation.