# HW Ch4 - HW Ch. 4 Motion in Two and Three Dimensions...

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HW Ch. 4 Motion in Two and Three Dimensions Chapter 4: Motion in Two and Three Dimensions Conceptual problems 4.C.2 (5.00) Two girls decide to jump off a diving board. Katherine steps off the diving board. Anna runs straight off the diving board so that her initial velocity is solely horizontal. They both leave the diving board at the same time. Which one lands in the water first? Katherine Anna They land at the same time (0/1 submissions used) 4.C.5 (5.00) Sarah is standing on the east bank of a river that runs south to north, and she wants to meet her friends who are on a boat in the middle of the river, directly west of her. Her friends point the boat east, directly at her, and then turn on the motor. The boat stays pointed east throughout its journey. (a) At what speed should Sarah walk or run along the bank of the river in order for her to meet the boat when it touches the bank? (b) In what direction should she move? (c) Does either answer depend on the speed of the boat relative to the water, which is provided by the motor? (a) The speed of the river Zero Twice the speed of the river The speed that the boat could travel in still water (0/2 submissions used) (b) North South She should stand still (0/1 submissions used) (c) Yes No (0/1 submissions used)

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Section 0: Introduction 4.0.1 (5.00) Use the simulation in the driving interactive problem from Section 4.0 to answer the following questions. (a) Does changing the x velocity affect the y velocity? (b) How does increasing the magnitude of either velocity affect the overall speed? (a) Yes No (0/1 submissions used) (b) There is no effect The speed increases The speed decreases (0/1 submissions used) 4.0.2 (5.00) Use the simulation in the cannon interactive in Section 4.0 to answer the following questions. (a) Does the cannonball's horizontal velocity change as it moves through the air? (b) Does its vertical velocity change? (c) If you increase the cannonball's horizontal velocity, does it stay in the air longer, the same
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## HW Ch4 - HW Ch. 4 Motion in Two and Three Dimensions...

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