REVIEW 4 Pressure, Moment and Spring ***

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A spring which obeys Hooke's law has an unstretched length of 10 cm.

A load of 20 N is hung from the spring.

The new length of the spring is 36 cm.

What is the spring constant k of the spring?

• 0.56 N/cm

• 0.77 N/cm

• 1.3 N/cm

• 1.8 N/cm

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What is the unit of the moment of a force?

• N

• N/ kg

• N/ m

• Nm