HW due Mar. 3

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Apr 3, 2024

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HW due Mar. 3 Due: 11:59pm on Sunday, March 3, 2024 To understand how points are awarded, read the Grading Policy for this assignment. Exercise 7.28 In an experiment, one of the forces exerted on a proton is , where . Part A How much work does do when the proton moves along the straight-line path from the point to the point ? Express your answer in joules. ANSWER: Correct Part B How much work does do when the proton moves along the straight-line path from the point to the point ? Express your answer in joules. ANSWER: Correct Part C How much work does do when the proton moves along the straight-line path from the point to the point ? Express your answer in joules. ANSWER: Correct Part D Is the force conservative? ANSWER: = 0 = -0.10 = 0.10

Correct Part E What is the potential-energy function for ? Let when . Express your answer in terms of and . ANSWER: Correct Exercise 8.1 - Enhanced - with Solution For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Momentum versus kinetic energy . Part A What is the magnitude of the momentum of a 12000 truck whose speed is 12.0 ? Express your answer with the appropriate units. ANSWER: Correct IDENTIFY and SET UP: . . Execute: Part B What speed would a 2400 SUV have to attain in order to have the same momentum? Express your answer with the appropriate units. ANSWER: No Yes = = 1.4×10 5 = 60

Correct . Part C What speed would a 2400 SUV have to attain in order to have the same kinetic energy? Express your answer with the appropriate units. ANSWER: Correct , so EVALUATE: The SUV must have less speed to have the same kinetic energy as the truck than to have the same momentum as the truck. Exercise 8.10 - Enhanced - with Feedback A bat strikes a 0.145 baseball. Just before impact, the ball is traveling horizontally to the right at 50.0 ; when it leaves the bat, the ball is traveling to the left at an angle of above horizontal with a speed of 52.0 . The ball and bat are in contact for 1.85 . Part A Find the - and -components of the average force on the ball. Suppose that the axis is directed to the right, and the axis is directed upward. Express your answers in newtons using three significant figures separated by a comma. ANSWER: Correct Exercise 8.20 - Enhanced - with Feedback You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. A friend throws you a 0.600 ball that is traveling horizontally at 10.0 . Your mass is 60.0 . = 27 , = -7450,2040

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Part A If you catch the ball, with what speed do you and the ball move afterward? Express your answer with the appropriate units. ANSWER: Correct Part B If the ball hits you and bounces off your chest, so afterward it is moving horizontally at 8.0 in the opposite direction, what is your speed after the collision? Express your answer with the appropriate units. ANSWER: Correct Exercise 8.38 Two cars collide at an intersection. Car , with a mass of 2000 , is going from west to east, while car , of mass 1500 , is going from north to south at 16 . As a result of this collision, the two cars become enmeshed and move as one afterwards. In your role as an expert witness, you inspect the scene and determine that, after the collision, the enmeshed cars moved at an angle of 65 south of east from the point of impact. Part A How fast were the enmeshed cars moving just after the collision? Express your answer in meters per second. ANSWER: Correct Part B How fast was car going just before the collision? Express your answer in meters per second. ANSWER: = 9.90×10 −2 = 0.180 = 7.6

Correct Exercise 8.44 - Enhanced - with Feedback A 15.0 block is attached to a very light horizontal spring of force constant 475 and is resting on a smooth horizontal table . Suddenly it is struck by a 3.00 stone traveling horizontally at 8.00 to the right, whereupon the stone rebounds at 2.00 horizontally to the left. Part A Find the maximum distance that the block will compress the spring after the collision. ( Hint : Break this problem into two parts - the collision and the behavior after the collision - and apply the appropriate conservation law to each part.) Express your answer in meters. ANSWER: Correct Exercise 8.60 You have three identical, uniform, square pieces of wood, each with side length . You stack the three pieces of wood at the edge of the horizontal top of a table. The first block extends a distance past the edge of the table. The next block extends a distance past the edge of the first block, so a distance past the edge of the table. The third block extends a distance past the edge of the block beneath it, so past the edge of the table. The stack is unstable if the center of mass of the stack extends beyond the edge of the table. Part A Calculate the horizontal location of the center of mass of the three-block stack. Suppose that the origin of the horizontal -axis is at the edge of the table, and the -axis points toward the table's center. ANSWER: Correct = 5.6 = 0.355 = 0

Problem 8.87 In a shipping company distribution center, an open cart of mass 49.0 is rolling to the left at a speed of 5.50 . You can ignore friction between the cart and the floor. A 14.0 package slides down a chute that is inclined at 37 from the horizontal and leaves the end of the chute with a speed of 3.10 . The package lands in the cart and they roll off together. Part A If the lower end of the chute is a vertical distance of 4.00 above the bottom of the cart, what is the speed of the package just before it lands in the cart? Express your answer in meters per second. ANSWER: Correct Part B What is the final speed of the cart? Express your answer in meters per second. ANSWER: Correct Score Summary: Your score on this assignment is 100%. You received 40 out of a possible total of 40 points. = 9.38 = 3.73

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