A Meter Stick Is Supported by a Knife-Edge at the 50-Cm

question 30

Multiple Choice

A meter stick is supported by a knife-edge at the 50-cm mark.Doug hangs masses of 0.40 and 0.60 kg from the 20-cm and 80-cm marks,respectively.Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?

• A)20 cm
• B)70 cm
• C)30 cm
• D)25 cm

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Definitions:

Occipital Lobes

Portion of the cerebral cortex lying at the back of the head; includes areas that receive information from the visual fields.

Temporal Lobes

Portion of the cerebral cortex lying roughly above the ears; includes the auditory areas, each receiving information primarily from the opposite ear.

Motor Cortex

An area at the rear of the frontal lobes that controls voluntary movements.

Association Areas

Regions of the brain that integrate sensory and motor information, involved in higher mental functions such as learning, thinking, and creativity.