A ? relay is a relay that not only maintains its contacts in the last position without a continuously energized coil, but also with a mechanical mechanism or remnant magnetism until it resets electrically.

A latching relay

Explanation:

A latching relay is a subtype of electromechanical or electromagnet switch. It is a type of relay that maintains its position even after the power is removed. The reason why its used is because they allow a control of circuit by simply providing a single pulse to the relay control circuit.

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mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b