PH2100 Final exam PRACTICE #2 Spring 2023_ PH2100 0A and 0B Spring 2023 - Combined Section

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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 1/21 PH2100 Final exam PRACTICE #2 Spring 2023 Due No due date Points 0 Questions 30 Time Limit None Instructions Attempt History Attempt Time Score LATEST Attempt 1 less than 1 minute 0 out of 0 Submitted Apr 20 at 12:43pm This OPTIONAL exam contains 30 questions as will your final exam. It is recommended that you limit yourself to 2 hours and use only the formula sheet in your initial attempt to simulate exam conditions. But you are welcome to repeat the exam as many times and in whatever ways you wish. 0 / 0 pts Question 1 Unanswered Unanswered Two children (Ann and Bob) have a footrace. A motion diagram of this race is shown in the figure below. All motion is from left to right with a time of one second between each successive location image. Ann and Bob start the race together at the same time and place (x = 0 m). What is Bob’s displacement after the first four seconds of his motion? Zero
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 2/21 15 m 25 m 30 m orrect Answer orrect Answer 35 m 0 / 0 pts Question 2 Unanswered Unanswered People walking through an airport can walk on a "moving walkway" to cover distance more quickly. Suppose the walkways have a speed of 2.5 m/s. Consider a person who can walk at a speed of 1.5 m/s and run at a speed of 3.5 m/s on an unmoving floor. Suppose the person walks forward along a 100 m long walkway, then turns around and runs 100 m back (opposite the direction of the walkway's movement). How long will this round trip take? 25 seconds 44 seconds 80 seconds 125 seconds orrect Answer orrect Answer 133 seconds 0 / 0 pts Question 3 Unanswered Unanswered An object moving along a straight, horizontal path has its velocity described by the function v(t) = 2.00 t, where the velocity has units of
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 3/21 meters per second for time (t) given in seconds. What is the object’s acceleration when t = 5.00 s? 10.0 m/s/s 2.00 m/s/s orrect Answer orrect Answer Zero -2.00 m/s/s -10.0 m/s/s 0 / 0 pts Question 4 Unanswered Unanswered The figure below shows a velocity-versus-time graph for the motion of an object as it moves along an x-axis. The location of the object is at x = 0 meters when t = zero. What is the object’s location when t = 20 s? 0 0 60 m 40 m 25 m orrect Answer orrect Answer
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 4/21 15 m 2.0 m 0 / 0 pts Question 5 Unanswered Unanswered If A= 2.00î + 1.00ĵ and B= 1.00î - 2.00ĵ , then what is the magnitude of the vector ? 3.00 4.00 5.00 orrect Answer orrect Answer 7.00 9.00 The following information applies to the next two questions (6 and 7). A battleship simultaneously fires two shells at two different ships as shown in the figure below. The shells follow the shown trajectories with the height reached by trajectory A being higher than trajectory B. Both shells are fired from the same location, and return to the same height (y=0) when they hit the ships. Assume that the trajectories of the shells are well described by projectile motion.
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 5/21 0 / 0 pts Question 6 Unanswered Unanswered Suppose that the shell following trajectory A was fired with a speed of 833 m/s at an angle of 60.5° above horizontal. What is the shell’s height in meters (with respect to its firing location) when it reaches the peak of its trajectory? (Enter your answer to the nearest whole number to avoid rounding error.) ou Answered ou Answered 26,818 margin of error +/- 1% orrect Answer orrect Answer 0 / 0 pts Question 7 Unanswered Unanswered Which statement below is correct ? Ship A is hit first by a shell Ship B is hit first by a shell orrect Answer orrect Answer Ship A and Ship B are hit simultaneously
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 6/21 Not enough information is given to determine which ship is hit first 0 / 0 pts Question 8 Unanswered Unanswered A spinning disk goes steadily from rest to 2.00 revolutions per second in 4.00 seconds. What is the magnitude of the radial acceleration experienced by a point on the disk that is 0.250 meters from the spin axis when t = 4.00 s? 4.00 m/s/s 6.20 m/s/s 16.0 m/s/s 39.5 m/s/s orrect Answer orrect Answer 158 m/s/s The following information applies to questions 9 and 10. Generic Person pushes a crate up a ramp inclined at 30.0° as shown in the figure below. The coefficient of kinetic friction between the block and the ramp is 0.20. The mass of the crate is 50.0 kg. The crate and Generic Person are moving up the ramp with a constant speed.
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 7/21 0 / 0 pts Question 9 Unanswered Unanswered Which free-body diagram below is correct for the crate? A B C D orrect Answer orrect Answer 0 / 0 pts Question 10 Unanswered Unanswered What is the magnitude of the push force on the crate from Generic Person? 245 N 330 N orrect Answer orrect Answer 490 N 849 N
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 8/21 980 N 0 / 0 pts Question 11 Unanswered Unanswered Generic Person (mass = 75.0 kg) is standing on a spring scale in an elevator as shown in the figure below. If the elevator has an acceleration of 1.19 m/s/s, then what does the spring scale report for GenericPerson's weight? (Use the coordinate system where up is positive, and report your answer to 2 decimal places to avoid rounding error.) ou Answered ou Answered 824.25 margin of error +/- 1% orrect Answer orrect Answer 0 / 0 pts Question 12 Unanswered Unanswered A pushed block is released to slide across a level rough surface. If the block is released with a speed of 2.00 m/s and comes steadily to rest after sliding 2.00 meters, then what is the coefficient of kinetic friction between the surface and the block? 0.102 orrect Answer orrect Answer 0.204
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 9/21 0.408 0.612 None of these answers The following information applies to the next two questions (13 and 14). In the figure below, a block of mass m1 = 2.00 kg is observed to slide to the right on a frictionless horizontal table with an acceleration of 2.50 m/s . Assume both pulleys are massless and frictionless. 2 0 / 0 pts Question 13 Unanswered Unanswered What is the acceleration of block m ? 2
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 10/21 -1.25 m/s/s orrect Answer orrect Answer -1.50 m/s/s -1.75 m/s/s -2.00 m/s/s -2.50 m/s/s 0 / 0 pts Question 14 Unanswered Unanswered What is the mass of block m ? 2 0.590 kg 0.752 kg 0.889 kg 1.01 kg 1.17 kg orrect Answer orrect Answer 0 / 0 pts Question 15 Unanswered Unanswered A roller coaster car with mass 260 kg travels over the top of a circular hill with radius 18.0 m as shown in the figure below. What maximum speed can the car have without losing contact with the hill?
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 11/21 5.6 m/s 13.3 m/s orrect Answer orrect Answer 39.9 m/s 56.4 m/s 176.4 m/s The following information applies to the next two questions (16 and 17). A box is pushed by a force of magnitude of 50.0 N and direction 60 degrees from the vertical in a straight line for 8.00 m across a rough floor as shown in the figure below. The mass of the box is 22.0 kg, and it travels with a constant speed. 0 / 0 pts Question 16 Unanswered Unanswered What is the work done by the normal force on the box?
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 12/21 Zero orrect Answer orrect Answer 200 J 1720 J 1920 J None of these answers 0 / 0 pts Question 17 Unanswered Unanswered What is the change in thermal energy of the box and floor across the 8 m? Zero 200 J 346 J orrect Answer orrect Answer 1720 J 1920 J 0 / 0 pts Question 18 Unanswered Unanswered A block (mass = 5.00 kg) on a track is pushed from rest by a compressed spring as shown in the figure below. The spring constant is 200 N/m, and the spring is compressed 0.500 m from equilibrium. The track is frictionless, except for the section between locations A and B. The initial height, h, of the block is 1.50 meters above ground level.
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 13/21 What is the speed of the block after the spring is released, and the block has slid down to ground level (just before reaching location A on the track)? 3.16 m/s 5.42 m/s 6.28 m/s orrect Answer orrect Answer 8.33 m/s 39.4 m/s The following information applies to the next two questions (19 and 20). Far in space, where gravity is negligible, a 5000 kg satellite traveling with a speed of 100 m/s fires its engine to speed up along its direction of travel. The figure below shows the thrust force of the engine as a function of time. The mass lost during the firing of the engine during this time is negligible compared to the mass of the satellite. The total time to start up, fire, and then shut down the engine is 12.0 seconds (as shown in the graph).
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 14/21 0 / 0 pts Question 19 Unanswered Unanswered At what time (referring to the time axis of the graph) does the satellite first reach its maximum speed? zero 2.00 s 6.00 s 10.0 s orrect Answer orrect Answer 12.0 s 0 / 0 pts Question 20 Unanswered Unanswered What is the maximum speed achieved by the satellite from firing the engine?
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 15/21 4.00 m/s 8.00 m/s 100 m/s 104 m/s orrect Answer orrect Answer 108 m/s 0 / 0 pts Question 21 Unanswered Unanswered A green rubber ball moving at 2 m/s collides with a red rubber ball that is initially at rest. The mass of the green rubber ball is approximately 100 times greater than the mass of the red rubber ball. If the collision is perfectly elastic, and happens in one dimension, then what is the approximate speed (in m/s) of the red rubber ball after the collision? (Enter your answer to 2 decimal places to avoid rounding error.) ou Answered ou Answered 4 margin of error +/- 1% orrect Answer orrect Answer 0 / 0 pts Question 22 Unanswered Unanswered A 300 g rubber ball is released from a height of 4.4 m. It falls to the floor, bounces, and rebounds to a height of 3 m. Ignoring gravity during the collision, what is the magnitude of the impulse (in kg-m/s) delivered to the ball by the floor during its bounce? (Enter your answer to two decimal places to avoid rounding error.)
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 16/21 ou Answered ou Answered 5.086 margin of error +/- 1% orrect Answer orrect Answer 0 / 0 pts Question 23 Unanswered Unanswered A distant, stationary meteor mysteriously explodes into two pieces. Piece A has a larger mass than Piece B. The two pieces of the meteor move apart from one another. Consider the meteor (and its subsequent two pieces) to be the system, and ignore any gravitational forces due to all bodies outside the system. Which of the following statements are true? (check all that apply.) The objects must move in opposite directions orrect Answer orrect Answer The objects must have equal speeds The objects must have equal but opposite momenta orrect Answer orrect Answer Object A's speed is larger than object B's speed Mechanical Energy is conserved in this explosion The following information applies to questions 24 and 25. A large plate is dropped, falls straight down, and breaks into three pieces after colliding with the floor. The pieces fly apart on the smooth floor. The figure below provides a view looking down from above. The net external force acting on the plate during its free-fall and during its collision with the floor has no component parallel to the floor, so the momentum of the plate parallel to the floor (in the horizontal plane of the floor) must be conserved.
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 17/21 0 / 0 pts Question 24 Unanswered Unanswered What is speed v of the piece of mass 0.750 kg? 1 0.305 m/s 0.326 m/s 0.350 m/s 0.386 m/s orrect Answer orrect Answer 0.417 m/s 0 / 0 pts Question 25 Unanswered Unanswered
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 18/21 What was the mass of the plate before it shattered into pieces? 1.91 kg orrect Answer orrect Answer 2.29 kg 2.51 kg 2.88 kg 3.09 kg 0 / 0 pts Question 26 Unanswered Unanswered Two children live near a lake. In the middle of winter when the lake is solidly and smoothly frozen, they play catch by sliding a rock back and forth between them across the ice. The mass of each child is 35.0 kg, and the rock has a mass of 5.00 kg. Child A stands on shore (where there is friction), and pushes the rock toward Child B with a speed of 1.00 m/s. Child B catches and firmly holds the rock. Ignoring all friction, and treating the children and rock as particles, what is the final speed of Child B and the rock? 0.05 m/s 0.125 m/s orrect Answer orrect Answer 0.375 m/s 0.5 m/s 1.0 m/s
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4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 19/21 0 / 0 pts Question 27 Unanswered Unanswered Ball A and Ball B both have masses of 0.5 kg. Ball A has an intial speed of 4.0 m/s to the right and Ball B has an initial speed of 2.0 m/s to the left. If the two have an elastic collision, which statements below are true? (Check all that apply.) Ball A's final speed is 2.0 m/s to the left orrect Answer orrect Answer Both balls move to the left after the collision Ball A has zero velocity after the collision Mechanical Energy is conserved in the two ball system orrect Answer orrect Answer Both balls move to the right after the collision The following information applies to questions 28 and 29. Jupiter has a volcanic moon called Io that is 4.22×10 m from Jupiter’s center and takes 1.77 days to go around the planet. Another of Jupiter’s moons, Europa, is 6.71×10 m from Jupiter’s center. Assume the orbits are circular. 8 8 0 / 0 pts Question 28 Unanswered Unanswered Based on the above observations, what is the mass of Jupiter? 1.90e27 kg orrect Answer orrect Answer
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 20/21 2.10e27 kg 2.30e27 kg 2.50e27 kg 2.70e27 kg 0 / 0 pts Question 29 Unanswered Unanswered How many days does it take Europa to orbit Jupiter? 2.58 days 2.82 days 3.04 days 3.29 days 3.55 days orrect Answer orrect Answer 0 / 0 pts Question 30 Unanswered Unanswered The mass of Mars is 6.42e23 kg and its radius is 3.37e6 m. If a Martian drops a marble above the surface of Mars, how far does it fall in 1.030 s? 1.26 m 1.43 m 2.00 m orrect Answer orrect Answer
4/20/23, 12:43 PM PH2100 Final exam PRACTICE #2 Spring 2023: PH2100 0A and 0B Spring 2023 - Combined Section https://mtu.instructure.com/courses/1440141/quizzes/2541052 21/21 3.77 m 4.16 m
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