QUESTION:
Can the Sojourner rover tilt its solar panels to maximize the their exposure
to the sun's rays? This same mechanism might also be used to flip Sojourner
right-side-up if it somehow became inverted.

ANSWER from David Dubov:
The 'Sojourner' rover cannot tilt its solar panel to maximize panel exposure
to the sun. The solar panel is oversized to account for tilts associated
with driving across the surface.

The panel surface is quite fragile as each solar cell is mounted below a
clear cover glass. Although a mechanism as described might 'upright' an
overturned rover, the damage inflicted by the overturning event would be
considerable.