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Tutor profile: Doug B.

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Doug B.
Installation Supervisor at Peak View Solar
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Questions

Subject: Mechanical Engineering

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Question:

What are the four main forces on an aircraft wing?

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Doug B.
Answer:

1. Lift 2. Drag 3. Weight 4. Thrust

Subject: Construction

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Question:

Your company is performing electrical work for homeowners within city limits. Which of the following restrict your work the most? A) National Electric Code B) International Residential Code C) International Building Code D) Authority Having Jurisdiction

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Doug B.
Answer:

Answer: D Reason: The Authority Having Jurisdiction, typically the building department of the city/county, has the final say on all construction work done. In the case of electrical work done, they determine which NEC code cycle they are on(i.e. 2011, 2014, 2017).

Subject: Physics

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Question:

Ignoring terminal velocity and air friction, what is the velocity (in m/s) of a sock full of rocks dropped from dorm room window when it hits the ground? Gravity is 9.81m/s^2 Height of the dorm room window: 27m

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Doug B.
Answer:

From the fourth kinematic formula: vf^2 = vi^2 + 2a(xi -xf) We then plug in the values given to us. vf^2 = 0 + 2(9.81(m/s^2))(27(m) - 0(m)) Simplify vf^2 = 529.74(m^2/s^s) Square Root vf = 23.02 m/s

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