Serway_CP_poll_ch05

Serway_CP_poll_ch05 - A 1000 kg sportscar accelerates from...

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Unformatted text preview: A 1000 kg sportscar accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the automobile engine? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 20.8 kW 2. 30.3 kW 3. 41.7 kW 4. 52.4 kW A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill. If there is no friction, what is the velocity at the bottom of the hill? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 27 m/s 2. 36 m/s 3. 45 m/s 4. 54 m/s A jet engine develops 10 5 N of thrust in moving an airplane forward at a speed of 900 km/hr. What is the power developed by the engine? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 500 kW 2. 1 MW 3. 2.5 MW 4. 5 MW A speedboat requires 80 kW to move at a constant speed of 15 m/s. What is the resistive force of the water at this speed? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 2667 N 2. 5333 N 3. 6500 N 4. 7711 N A pole vaulter clears 6 m. With what velocity does he strike the mat in the landing area? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 2.7 m/s 2. 5.4 m/s 3. 10.8 m/s 4. 21.6 m/s A parachutist of mass 50 kg jumps out of an airplane at a height of 1000 m. The parachute deploys, and she lands on the ground with a velocity of 5 m/s. How much energy was lost to air friction during this jump? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 49,375 J 2. 98,750 J 3. 197,500 J 4. 489,375 J Water flows over a section of Niagara Falls at a rate of 1.2 x 10 6 kg/s and falls 50 m. What is the power wasted by the waterfall? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 588 MW 2. 294 MW 3. 147 MW 4. 60 MW A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 40 m/s and initial angle of 30 . What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction. 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. zero 2. 30 J 3. 90 J 4. 120 J A Russian weightlifter is able to lift 250 kg 2 m in 2 s. What is his power output?...
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Serway_CP_poll_ch05 - A 1000 kg sportscar accelerates from...

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