A 50-Kg Air Conditioner Is Placed on Top of a Concrete

question 41

Multiple Choice

A 50-kg air conditioner is placed on top of a concrete pad that is 20 cm thick and has a cross-sectional area of $3.0 \mathrm {~m} ^ { 2 }$ What is the change in thickness of the pad caused by the air conditioner? Young's modulus for concrete is $2.3 \times 10 ^ { 10 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

• A) \(1.4 \times 10 ^ { - 9 } \mathrm {~m}\)
• B) \(2.8 \times 10 ^ { - 9 } \mathrm {~m}\)
• C) \(1.4 \times 10 ^ { - 7 } \mathrm {~m}\)
• D) \(2.8 \times 10 ^ { - 8 } \mathrm {~m}\)
• E) \(1.4 \times 10 ^ { - 8 } \mathrm {~m}\)

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