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homework 1

# homework 1 - narainswamy(ann452 – HW1 – Mackie...

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Unformatted text preview: narainswamy (ann452) – HW1 – Mackie – (20211) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A water holding tank measures 105 m long, 40 m wide, and 11 m deep. Traces of mercury have been found in the tank, with a concen- tration of 60 mg / L. What is the total mass of mercury in the tank? Correct answer: 2772 kg. Explanation: Let : ℓ = 105 m , w = 40 m , d = 11 m , and ρ = 60 mg / L . ρ = m V m = ρ V = ρ ℓ w d = (60 mg / L) (105 m) (40 m) (11 m) × kg 10 6 mg · 1000 L m 3 = 2772 kg . 002 10.0 points One cubic centimeter ( 1 . 0 cm 3 ) of water has a mass of 0 . 001 kg at 25 ◦ C. Find the mass of 8 . 8 m 3 of water at 25 ◦ C. Correct answer: 8800 kg. Explanation: Basic Concepts: ρ = m V 1 cm = 1 × 10 − 2 m Given: V = 8 . 8 m 3 ρ = . 001 kg 1 cm 3 Solution: m = ρV = . 001 kg 1 cm 3 · (8 . 8 m 3 ) parenleftbigg 1 cm 1 × 10 − 2 m parenrightbigg 3 = 8800 kg 003 10.0 points A four-engine jet accelerates down the runway at 6 m / s 2 ....
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homework 1 - narainswamy(ann452 – HW1 – Mackie...

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