chapter 5 pretest. 1. which of the following energy forms is associated with an object’s...
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Chapter 5 Pretest
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1. Which of the following energy forms is associated with an object’s interaction with the environment? A) potential energy, B) mechanical energy, C) nonmechanical energy, D) kinetic energy.
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1. Which of the following energy forms is associated with an object’s interaction with the environment? A) potential energy, B) mechanical energy, C) nonmechanical energy, D) kinetic energy.
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2. Work is done when:a. the displacement is not zerob. the displacement is zeroc. the force is zero d. the force and displacement are perpendicular
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2. Work is done when:a. the displacement is not zerob. the displacement is zeroc. the force is zero d. the force and displacement are perpendicular
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3. Which of the following energy forms is the sum of kinetic energy and all forms of potential energy?a. total energyb. sum energyc. nonmechanical energyd. mechanical energy
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3. Which of the following energy forms is the sum of kinetic energy and all forms of potential energy?a. total energyb. sum energyc. nonmechanical energyd. mechanical energy
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4. An 80.0 kg climber with a 20.0 kg pack climbs 8848 m to the top of Mount Everest. What is the climber’s potential energy?
a. 6.94 x 106 Jb. 4.16 x 106 Jc. 2.47 x 106 Jd. 1.00 x 106 J
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4. An 80.0 kg climber with a 20.0 kg pack climbs 8848 m to the top of Mount Everest. What is the climber’s potential energy?
a. 6.94 x 106 Jb. 4.16 x 106 Jc. 2.47 x 106 Jd. 1.00 x 106 J
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5. A bobsled zips down an ice track starting at 150 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? a. 27 m/sb. 36 m/sc. 45 m/sd. 54 m/s
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5. A bobsled zips down an ice track starting at 150 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? a. 27 m/sb. 36 m/sc. 45 m/sd. 54 m/s
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6. What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s?a. 380 Wb. 560 Wc. 610 Wd. 670 W
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6. What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s?a. 380 Wb. 560 Wc. 610 Wd. 670 W
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1. Demarco Murray (100 kg) accelerates from rest to 9.0 m/s in 1.5 s. What is the average power output of Demarco in kW?
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F = maF = 100(9/1.5) = 600 Nd = ½ at2 d = ½ (9/1.5)(1.5)2 = 6.75 mP = Fd/tP = 600(6.75)/1.5P = 2700 W = 2.7 kW
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OR P = FvThe force is still 600 N, v is the average velocity 9/2 = 4.5 m/s.P = 600 x 4.5 m/sP = 2700 W = 2.7 kW
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2. Two men push a car with a horizontal force of 250 N each for a distance of 10.0 m. If a frictional force of 180 N acts in the opposite direction, what is the net work done on the car?
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W = Fnet x dW = (250 + 250 – 180)10
W = 3200 J
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3. A 10 kg monkey with a 1 kg banana climbs to the top of a 10 m palm tree. What is the monkey’s potential energy?
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PE = mghPE = 10(10)10PE = 1000 J
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4. A 25 kg skier starts from rest and moves down a 30° incline. At the bottom of the run he is a vertical distance of 110 m below his starting point. If there is no friction between his skis and the snow, what is his velocity at the bottom of the incline?
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PE = KEmgh = ½ mv2
gh = ½ v2
10(110) = ½ v2
v = 46.9 m/s
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5. A bowling ball starts from rest and rolls to a speed of 40 m/s down a slope 20.0° above the horizontal. Disregarding friction, what is the minimum distance it must travel to reach this speed?
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PE = KEmgh = ½ mv2
gh = ½ v2
10h = ½ 402
h = 80 m (continued)
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80 m is the vertical distance, which is the opposite. The distance it rolls is the hypotenuse.
sin 20° = 80/hh = 234 m
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6. How is work related to force and displacement?
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Work = force x displacementW = F x d
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7. A skier with a mass of 88 kg hits a ramp of snow at 16 m/s and becomes airborne. At the highest point of flight, the skier is 3.7 m above ground. What is the skier’s gravitational potential energy at this point?
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PE = mghPE = 88(10)3.7PE = 3256 J
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