2. The position x of an object is given by the equation x = A + Bt +Ct, where t refers to time. What are the dimensions of A, B, and C? A) time, time, time D) distance/time, distance/time?, B) distance, distance, distance distance/time3 C) distance, time, time E) distance, distance/time, distance/time7. When a ball is thrown straight up, the acceleration at its highest point is A) horizontal. D) zero. B) minimum. E) upward. C) downward.10. Can an object have positive acceleration and decreasing speed? A) No, this is not possible. B) Yes, speed will always decrease if acceleration is positive. C) Yes, this is possible if the initial velocity is zero. D) Yes, this is possible if the initial velocity is negative. E) Yes, this is possible but only if the object is moving in two dimensions. 11. Under which of the following conditions would a car have a westward acceleration? A) The car going eastward and its velocity is constant. B) . The car going eastward and its velocity is decreasing. C) The car going eastward and its velocity is increasing. D) The car going westward and its velocity is constant. E) The car going westward and its velocity is decreasing.16. Two toy cars (16 kg and 2 kg) are released simultaneously on an inclined plane that makes an angle of 30 with the horizontal. Which statement best describes their acceleration after being released? A) The 16-kg car accelerates 8 times faster than the 2-kg car. B) Both cars accelerate at a rate of g sin(30) C) Both cars accelerate at a rate of 0.866 g. D) The 2-kg car accelerates 8 times faster than the 16-kg car. E) Both cars accelerate at a rate of 8*g.18. A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below? A) It is impossible to tell from the information given. B) the ball C) the stone D) Neither, since both are traveling at the same speed. 19. An arrow is shot straight up. At the top of its path, the net force acting on it is A) equal to its weight. D) horizontal. B) instantaneously equal to zero. E) greater than zero, but less than C) greater than its weight. its weight.21. A pilot executes a vertical dive. Just before the plane starts to come up from the bottom of the dive, the force on him is A) more than g, and pointing up. D) more than g, and pointing down. B) less than g, and pointing down. E) less than g, and pointing up. C) equal to g, and pointing down.23. Planning to escape, a prisoner slides down a rope from a fourth story window. As he slides down the rope, he tightens harder on the rope which of course increases the tension in the rope. When the upward tension in the rope equals his weight A) he will speed up. D) he will slow down. B) he will continue down at E) he will stop moving down the constant speed. rope. C) the rope will break. 24. You are twirling a rock around a horizontal circle on the end of a string. Figure below is a top view (motion is counterclockwise). If the speed is constant, what is the acceleration at point A? A) zero B) centrifugal C r D) V /r E) radial (centripetal) 25. Two identical masses are attached by a light string that passes over a small pulley, as shown below. The table and the pulley are frictionless. The masses are moving A) with an acceleration less than g. B) with an acceleration equal to g. m C) with an acceleration greater than 8. D) at constant speed. m13. After a projectile is launched horizontally, the vertical component of a projectile's velocity A) is zero. . D) remains a non-zero constant. B) continuously increases. E) any of the above, depending on C) continuously decreases. position