Quiz_ quizmotion2D

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6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 1/8 quizmotion2D Started: Jun 22 at 1:42am Quiz Instructions 2 attempts 50 mins 2 pts Question 1 At t = 0. At t = 0.52 s. At t = 4.71 s. At t = 4.98 s. At t = 5.24 s. Car A leaves point O at t = 0 and travels a quarter circle counterclockwise at 30.0 m/s to point P. Car B will leave point O and travel to point P at the same speed but in a straight line. The radius of the circle is 100 m. At what time should car B leave point O in order to arrive at point P at the same time as car A? 2 pts Question 2 A stunt pilot performs a circular dive of radius 800 m. At the bottom of the dive (point B in the figure) the pilot has a speed of 200 m/s which at that instant is increasing at a rate of 20 m/s . What acceleration does the pilot have at point B? 2

6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 2/8 m/s m/s m/s m/s m/s 2 2 2 2 2 2 pts Question 3 7.5 m/s 6.0 m/s 5.4 m/s 6.7 m/s 4.5 m/s A particle moves along a circular path having a radius of 2.0 m. At an instant when the speed of the particle is equal to 3.0 m/s and changing at the rate of 5.0 m/s , what is the magnitude of the total acceleration of the particle? 2 2 2 2 2 2 2 pts Question 4

6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 3/8 25.3 m 29.6 m 27.4 m 23.6 m 18.9 m A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53 ° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building? 3 pts Question 5 R = 0.29 km, and the car's speed is increasing. R = 0.23 km, and the car's speed is decreasing. R = 0.23 km, and the car's speed is increasing. R = 0.29 km, and the car's speed is decreasing. R = 0.29 km, and the car's speed is constant. A car travels in a flat circle of radius R . At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s 53 ° north of west. Which of the following is correct? 2 2 pts Question 6 Exhibit 4-1 While her kid brother is on a wooden horse at the edge of a merry-go-round, Sheila rides her bicycle parallel to its edge. The wooden horses have a tangential speed of 6 m/s. Sheila rides at 4 m/s. The radius of the merry-go-round is 8 m. Use this exhibit to answer the following question(s).

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6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 4/8 5.03 s 8.37 s 12.6 s 25.1 s 50.2 s Refer to Exhibit 4-1. At what time intervals does Sheila encounter her brother, if she rides in the direction of rotation of the merry-go-round? 2 pts Question 7 72 ft/s 77 ft/s 68 ft/s 82 ft/s 87 ft/s A rock is thrown from the edge of the top of a 100-ft tall building at some unknown angle above the horizontal. The rock strikes the ground a horizontal distance of 160 ft from the base of the building 5.0 s after being thrown. Assume that the ground is level and that the side of the building is vertical. Determine the speed with which the rock was thrown. 3 pts Question 8 6.4 m A particle moves in the xy plane with a constant acceleration given by m/s . At t = 0, its position and velocity are m and m/s, respectively. What is the distance from the origin to the particle at t = 2.0 s? 2

6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 5/8 10 m 8.9 m 2.0 m 6.2 m 1 pts Question 9 it is passing car A. it has the same linear (tangential) acceleration as car A. it has the same centripetal acceleration as car A. it has the same total acceleration as car A. it has traveled farther than car A since starting. Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that: 1 pts Question 10 just touching down. in level flight in the air. The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by and m/s. The plane is most likely

6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 6/8 ascending. descending. taking off. 1 pts Question 11 A projectile's displacement two seconds after being fired downward with a speed of 30.0 m/s. A projectile's displacement two seconds after being fired downward with a speed of 40.0 m/s. A projectile's displacement two seconds after being fired downward with a speed of 50.0 m/s. A projectile's displacement two seconds after being fired downward with a speed of 60.0 m/s. A projectile's displacement two seconds after being fired downward with a speed of 80.0 m/s. Given the equations below, which description best fits the physical situation? 2 pts Question 12 8.2 m 15.8 m 13.5 m 11.0 m 4.9 m A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?

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6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 7/8 1 pts Question 13 v must be greater than v . Ball A is in the air for a longer time than ball B. Ball B is in the air for a longer time than ball A. Ball B has a greater acceleration than ball A. Ball A has a greater acceleration than ball B. Two balls, projected at different times so they don't collide, have trajectories A and B, as shown below. Which statement is correct? 0B 0A 2 pts Question 14 29 s 23 s 25 s 27 s 17 s A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?

6/22/23, 1:59 AM Quiz: quizmotion2D https://sjeccd.instructure.com/courses/37200/quizzes/243162/take 8/8 Quiz saved at 1:58am 2 pts Question 15 0.24 km 0.19 km 0.32 km 0.14 km 0.27 km A car travels in a flat circle of radius R . At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s east and 1.8 m/s south. What is the radius of the circle? 2 2 2 pts Question 16 36 m 20 m 45 m 27 m 37 m A particle starts from the origin at t = 0 with a velocity of 6.0 m/s and moves in the xy plane with a constant acceleration of m/s . At the instant the particle achieves its maximum positive x coordinate, how far is it from the origin? 2 Submit Quiz

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