quizmotion2D_ General Physics_ 2023SU-PHYS-004A-101

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PHY 222

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Feb 20, 2024

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6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 1/10 quizmotion2D Due Aug 2 at 11:59pm Points 30 Questions 16 Available Jun 12 at 12am - Aug 2 at 11:59pm Time Limit 50 Minutes Instructions Attempt History Attempt Time Score LATEST Attempt 1 49 minutes 28 out of 30 Score for this quiz: 28 out of 30 Submitted Jun 22 at 2:31am This attempt took 49 minutes. 2 attempts 50 mins 2 / 2 pts Question 1 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? At t = 0. At t = 0.52 s. Correct! Correct! At t = 4.71 s. At t = 4.98 s. At t = 5.24 s.
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 2/10 2 / 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 m/s 2 m/s 2 m/s Correct! Correct! 2 m/s 2 m/s 2 2 / 2 pts Question 3 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
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 3/10 7.5 m/s 2 6.0 m/s 2 5.4 m/s 2 6.7 m/s Correct! Correct! 2 4.5 m/s 2 2 / 2 pts Question 4 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? 25.3 m 29.6 m 27.4 m 23.6 m Correct! Correct! 18.9 m 3 / 3 pts Question 5 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
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6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 4/10 R = 0.29 km, and the car's speed is increasing. Correct! Correct! 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. 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). 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? 5.03 s 8.37 s 12.6 s 25.1 s Correct! Correct! 50.2 s 2 / 2 pts Question 7
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 5/10 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. 72 ft/s 77 ft/s 68 ft/s Correct! Correct! 82 ft/s 87 ft/s 3 / 3 pts Question 8 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 6.4 m 10 m Correct! Correct! 8.9 m 2.0 m 6.2 m 1 / 1 pts Question 9
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 6/10 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: it is passing car A. it has the same linear (tangential) acceleration as car A. it has the same centripetal acceleration as car A. Correct! Correct! it has the same total acceleration as car A. it has traveled farther than car A since starting. 1 / 1 pts Question 10 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 just touching down. in level flight in the air. Correct! Correct! ascending. descending. taking off.
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6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 7/10 1 / 1 pts Question 11 Given the equations below, which description best fits the physical situation? 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. Correct! Correct! 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. 2 / 2 pts Question 12 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? 8.2 m
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 8/10 15.8 m 13.5 m Correct! Correct! 11.0 m 4.9 m 1 / 1 pts Question 13 Two balls, projected at different times so they don't collide, have trajectories A and B, as shown below. Which statement is correct? v must be greater than v . 0B 0A 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. Correct! Correct! Ball B has a greater acceleration than ball A. Ball A has a greater acceleration than ball B. 2 / 2 pts Question 14
6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 9/10 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? 29 s 23 s 25 s 27 s Correct! Correct! 17 s 0 / 2 pts Question 15 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 0.24 km 0.19 km ou Answered ou Answered 0.32 km orrect Answer orrect Answer 0.14 km 0.27 km 2 / 2 pts Question 16
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6/22/23, 2:31 AM quizmotion2D: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/243162 10/10 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 36 m 20 m Correct! Correct! 45 m 27 m 37 m Quiz Score: 28 out of 30

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