PHY-121 topic 1 practice test with answers working solution 2020

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PHY-121 topic 1 practice test with answers working solution 2020 Topic 1: Multiple-Choice Practice Test Multiple Choice Identify the choice that best completes the statement or answers the questi... on. If the acceleration of gravity is needed, please use: g = 10. m/s2. 1. If you drove day and night without stopping for one year without exceeding the legal highway speed limit (65 miles/h) in the United States, the maximum number of miles you could drive would be closest to: 2. Which quantity below has the same units as force times time, Ft, with dimensions M∙L∙T1 is 3. The position of a particle moving along the x axis is given by x = 6.0t2  1.0t3, where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction? (The LC answer is wrong, so just mark the answer you think as the correct.) 4. vx is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s? 5. A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5 s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval? 6. An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 3.1ns (nanoseconds). What is the speed when it reaches this distance? 7. An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object? 8. Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A: 9. A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down. At that point: 10. The equation that solves a problem is . The problem is: Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It reaches velocity v in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration, a/2. At time t it has reached velocity A particle is moving with a constant acceleration of 4.0 m/s2. Its speed at t = 1.0 s is 4.0 m/s and at t = 3.0 s it is 12.0 m/s. What is the area under the velocity-time graph for the interval from t = 1.0 s to t = 3.0 s? 13. At t = 0, a particle is located at x = 25 m and has a velocity of 15 m/s in the positive x-direction. The acceleration of the particle varies with time as shown in the diagram. What is the velocity of the particle at t = 5.0 s? Driver A is cruising along enjoying the fall colors. Driver B starts her car at the instant he passes her. Their velocities are shown as functions of time in the graph below. At what instants in time, on the graph are drivers A and B side by side? 15. A standard exam page is 8.5 inches by 11.0 inches. An exam that is 2.0 mm thick has a volume of 16. A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle? 17. In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the gym, what were her displacement and average velocity during this time interval? 18. A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board? 19. Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct? 20. The speed of an object is given by v = (5.00 m/s3)∙t2 + (4.00 m/s2)∙t. What is the acceleration of the object at t = 1.00 s? [Show More]

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