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# o dzer (o564) - EPQ 1: Newton's Laws - Morin - (14409) This print-out should have 23 questions. Multiple-choice questions may continue on the next...

odzer (o564) – EPQ 1: Newton’s Laws – Morin – (14409) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Two objects, oF masses 45 kg and 18 kg, are hung From the ends oF a stick that is 70 cm long and has marks every 10 cm, as shown. 45 kg 18 kg A B C D E F G 10 20 30 40 50 60 IF the mass oF the stick is negligible, at which oF the points indicated should a cord be attached iF the stick is to remain horizontal when suspended From the cord? 1. B 2. D 3. A 4. C 5. F 6. E 7. G 002 10.0 points A student weighing 700 N climbs at constant speed to the top oF an 8 m vertical rope in 10 s. The average power expended by the student to overcome gravity is most nearly 1. P = 875 W. 2. P = 87 . 5 W. 3. P = 1 . 1 W. 4. P = 5 , 600 W. 5. P = 560 W. 003 10.0 points Which oF the Following is true when an object oF mass m moving on a horizontal Frictionless surFace hits and sticks to an object oF mass M > m , which is initially at rest on the surFace? 1. The direction oF motion oF the objects that are stuck together depends on whether the hit is a head-on collision. 2. The collision is elastic. 3. The speed oF the objects that are stuck together will be less than the initial speed oF the less-massive object. 4. The momentum oF the objects that are stuck together has a smaller magnitude than the initial momentum oF the less-massive ob- ject. 5. All oF the initial kinetic energy oF the less-massive object is lost. 004 10.0 points Objects having the same mass travel toward each other on a ±at surFace, each with a speed oF 1.0 meter per second relative to the surFace. The objects collide head-on and are reported to rebound aFter the collision, each with a speed oF 2.0 meters per second relative to the surFace. Which oF the Following assessments oF this report is most accurate? 1. IF potential energy were released to the objects during the collision, the report could be true. 2. IF the objects had di²erent masses, the report could be true. 3. IF the surFace were inclined, the report could be true.
odzer (o564) – EPQ 1: Newton’s Laws – Morin – (14409) 2 4. If there were no friction between the ob- jects and the surface, the report could be true. 5. Momentum was not conserved; therefore the report is false. 005 10.0 points A weight lifter lifts a mass m at constant speed to a height h in time t . What is the average power output of the weight lifter? 1. ¯ P = g 2. ¯ P = mg h t 3. ¯ P = mg ht 4. ¯ P = mh 5. ¯ P = mg h 006 10.0 points A block of mass m slides on a horizontal frictionless table with an initial speed v 0 . It then compresses a spring of force constant k and is brought to rest. The acceleration of gravity is 9 . 8 m / s 2 . v m k m μ = 0 How much is the spring compressed x from its natural length? 1. x = v 0 mk g 2. x = v 0 r k m 3. x = v 0 k g m 4. x = v 0 r m k 5. x = v 2 0 2 m 6. x = v 0 r mg k 7. x = v 2 0 2 g 8. x = v 0 mg k 9. x = v 0 R k mg 10. x = v 0 m k g 007 (part 1 of 3) 10.0 points Assume you are on a planet similar to Earth where the acceleration of gravity g 10 m / s 2 . A plane 39 m in length is inclined at an angle of 22 . 6 as shown. A block of weight 390 N is placed at the top of the plane and allowed to slide down. 390 N μ = 0 . 2 v 39 m 22 . 6 36 m 15 m The mass of the block is most nearly 1. m 39 kg 2. m 20 kg 3. m 10 kg 4. m 26 kg 5. m 13 kg 6. m 25 kg 7. m 50 kg 8. m 15 kg 9. m 52 kg 008 (part 2 of 3) 10.0 points
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