PHYSICS 1 FINAL QUESTIONS & ANSWERS

PHYSICS 1 FINAL QUESTIONS & ANSWERS 35) Which of the following ideas is true about projectile motion with no air drag? A) Vx^2 + Vy^2 = constant B) The horizontal motion is independent of the vertical motion. C) The acceleration is +g when the object is rising and -g when falling. D) The trajectory will depend on the object's mass as well as its initial velocity and launch angle. E) The velocity of the object is zero at the point of maximum elevation. - ANSWER: 36) A projectile is fired from the origin (at y = 0 m) as shown in Figure 3.1. The initial velocity components are V0x = 940 m/s and V0y = 96 m/s. The projectile reaches maximum height at point P, then it falls and strikes the ground at point Q. In Figure 3.1, the y-coordinate of point P is closest to: A) 940 m B) 90,160 m C) 470 m D) 45,080 m E) 45,550 m - ANSWER: 4.00 × 105 J of work are done on a 1167 kg car while it accelerates from 10.0 m/s to some final 77) velocity. Find this final velocity. A) 25.2 m/s B) 30.8 m/s C) 28.0 m/s D) 22.4 m/s - ANSWER: 45) If you were to move into outer space far from any stars or planets, A) neither your weight nor your mass would change. B) your weight would change, but your mass would not change. C) your mass would change, but your weight would not change. D) both your weight and mass would change. E) None of these is true. - ANSWER: 5) Beings on spherical asteroid have observed that a large rock is approaching their asteroid in a 5) collision course. At 7514 km from the center of the asteroid, the rock has a speed of 136.0 m/s and later at 2823 km it has a speed of 392.0 m/s. Use energy conservation to find the mass of asteroid . You can neglect any effects due to the parent star of the asteroid. (G = 6.67 × 10-11 N · m2/kg2) A) 6.112 × 10^28 kg B) 9.164 × 10^27 kg C) 4.582 × 10^20 kg D) 4.582 × 10^21 kg - ANSWER: 50) Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N 50) pull, as shown in Figure 4.5. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. Which of the figures below shows a correct free-body diagram