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# img080 - 11321 11321 6 A 66 kg diver steps oﬂ" a...

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Unformatted text preview: 11321 11321 6. A 66 kg diver steps oﬂ" a tower 15 m above water and drops from rest straight down into the water. If he cornes to rest 5.0 m beneath the surface, determine the average resistance force exerted on him by the water. Ignore air resrstance. (1) 1200 N (2) 1900 N @ 1300 N (4) 2600 N (5) 650 N 7. A large beach ball with mass 1.0 kg is thrown upwards with velocity 8.0 m/s. The ball travels upwards a distance of 2.0 m before falling back to Earth. How much energy was lost to air resistance while the ball traveled upward? (1)81 J (2) 12 J (3) 22 J (4) 61 J (5) 32 J 8. John throws a rock down with speed 14 m/s from the top of a 30.0—m tower. What is the rock’s speed just as it hits the ground? (9 28 m/s (2) 6.0 m/s (3) 37 m/s (4)44 m/s (5) 12 m/s 9. The following force vectors act on an object: i) 50.0 newtons at 450" north of east and ii) 25.0 newtons at 300° south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction? (1) 12.8 newtons -37.5° (2) 12.8 newtons 37.5° (3) 23.4 newtons 183° (4) 75.0 newtons 7.50° @ 61.4 newtons 21.8° 10. A car is moving along a straight road with non—constant speed but always in the same direction. Which one of the following graphs is a valid position vs. time curve for the motion of the car? _x x x x [(2’) V (2) None of the graphs shown is valid @ \ (4) \/\ (5’) /\ t t t t 11. A force F is used to hold a block of mass m = 6.00 kg on an incline as shown in the diagram. The plane makes an angle of 9 = 30.0° with the horizontal and F is perpendicular to the incline. The coefﬁcient of static friction between the plane and the block is 0.300. What is the minimum force, F, necessary to keep the block at rest? ((1), 47.1 N (2) 9.80 N (3) 19.6 N (4) 62.8 N (5) 31.4 N \, ' 12. A ball is thrown upward from the ground with an initial speed of 35 m/s; at the same instant, another ball is dropped from a building 5.0 m high. After how long will the balls be at the same height? (1) 9.80 s @0143 s (3) 0.333 s (4) 4.90 s (5) 0.571 s 13. Have you entered your identifying information correctly on the answer form (bubble sheet)? The information, your name, UFID (8 digits, no space or hyphen), and exam code (5 digits), must be bubbled in the appropriate rows. (1) no @ yes (3) no (4) no (5) no ...
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