A Vertical 30-Cm Steel Rod, 1 $2.0 \times 10 ^ { 11 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

question 7

Multiple Choice

A vertical 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in Iength of the rod caused by this mass? Young's modulus for steel is $2.0 \times 10 ^ { 11 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

• A) \(6.5 \times 10 ^ { - 5 } \mathrm {~m}\)
• B) \(6.5 \times 10 ^ { - 6 } \mathrm {~m}\)
• C) \(6.5 \times 10 ^ { - 4 } \mathrm {~m}\)
• D) \(5.6 \times 10 ^ { - 6 } \mathrm {~m}\)
• E) \(5.6 \times 10 ^ { - 5 } \mathrm {~m}\)

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Definitions:

Cortical Areas

Regions of the brain's outer layer, the cortex, responsible for processing a vast array of information, including sensory perception, thought, and planning.

Brain Development

The process of growth and change in the brain's structure and function throughout a person's life.

Myelination

The process of forming a myelin sheath around the axons of neurons, which increases the speed and efficiency of electrical signal transmission.

Motor Drive

The pleasure young children take in using their new motor skills.