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Quiz%206%20%28Ch6%29%20solutions

# Quiz%206%20%28Ch6%29%20solutions - × space probe is...

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Student name________________________________________ Student NID__________________________________________ PHY 2053C-0001 Quiz, Mar. 4, 2011 1) A 47.0-g golf ball is driven from the tee with an initial speed of 52.0 m/s and rises to a height of 24.6 m. Neglect air resistance and determine the kinetic energy of the ball at its highest point. The conservation of mechanical energy states that f 2 2 1 1 f f 0 0 2 2 KE mv mgh mv mgh + = + 1 2 3 Solving this equation for the final kinetic energy, KE f , yields ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 2 1 f 0 0 f 2 2 2 1 2 KE 0.0470 kg 52.0 m /s 0.0470 kg 9.80 m /s 0 m 24.6 m 52.2 J mv mg h h = + - = + - = 2) A 4 5.0 10 -kg
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Unformatted text preview: × space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe’s speed. The retrorockets generate a force of 5 4.0 10 N × over a distance of 2500 km. What is the final speed of the probe? The work energy theorem, 2 2 1 1 f 2 2 W mv mv =-, gives 2 f 2 W v v m = + where 5 3 12 = cos 180° = (4.0 10 N)(2500 10 m) = 1.0 10 J W Fs-× ×-× Now ( 29 ( 29 12 2 3 f 4 2 1.0 10 J 11000 m/s 9 10 m/s 5.0 10 kg v-× = + = × ×...
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