QTest #8-solutions

# QTest #8-solutions - Correct answer 8 526 × 10 8 W...

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Version 056/AADCA – QTest #8 – Antoniewicz – (56445) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A Force F oF magnitude 2 x 3 is applied to stop a particle moving with an initial velocity v 0 . The particle travels From x = 0 to x = D in coming to a stop aFter the Force F is applied. The work done by F is 1. 2 D 3 2. - D 4 3. 1 2 D 4 4. 1 2 D 3 5. D 4 6. - D 3 7. - 1 2 D 3 8. - 1 2 D 4 correct Explanation: Because the Force is to stop the particle, it’s opposite to the particle’s motion direction, i.e., the Force is negative. ±rom the defnition oF work, W = i F d s = i D 0 - 2 x 3 d x = - 1 2 D 4 002 10.0 points Water ²ows over a section oF Niagara ±alls at a rate oF 1 . 5 × 10 6 kg / s and Falls 58 m. The acceleration oF gravity is 9 . 8 m / s 2 . What is the power wasted by the waterFall? 1. 658560000.0 2. 779100000.0 3. 700700000.0 4. 1555260000.0 5. 689920000.0 6. 966280000.0 7. 713440000.0 8. 917280000.0 9. 852600000.0 10. 1078000000.0

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Unformatted text preview: Correct answer: 8 . 526 × 10 8 W. Explanation: P = W t = mg h t = ρg h = (1 . 5 × 10 6 kg / s) (9 . 8 m / s 2 ) (58 m) = 8 . 526 × 10 8 W 003 10.0 points The fgure shows a potential energy curve For the interaction oF a two atom system. The horizontal line represents a bound state with constant K+U value. What is the minimum amount oF energy (in units oF eV) which must be supplied to cause the separation oF two atoms? (Caution: be careFul with the sign here.) 1.-0.2 2. 0.2 correct 3. 1.3 4. 0.9 5.-1.2 6.-0.9 Version 056/AADCA – QTest #8 – Antoniewicz – (56445) 2 Explanation: The minimum amount of energy needed is to bring the system from present state where E i = ( K + U ) i =-. 2 eV to the Fnal state where E f = ( K + U ) f = 0. The energy principle is E f-E i = W Δ E = W = E f-E i = 0-(-. 2 eV) = 0 . 2 eV ....
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QTest #8-solutions - Correct answer 8 526 × 10 8 W...

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