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Solutions Chapter 3

# Solutions Chapter 3 - Chapter 3 problems 1B Both balls hit...

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Chapter 3 problems 1B - Both balls hit the groupd at the same time because the horizontal and vertical motions are independent. The red ball has the higher speed because it has an additional horizontal component of velocity while its vertical velocity is the same as the blue ball 2C - The x component of the velocity remains the same, and the acceleration is always g. 3D - The magnitude of the resultant vector has to be smaller than 240 (200+40) and larger than 160(200- 40). 21B - By definition, the average velocity is the displacement (2 radii = 60.0 m east) divided by the time duration (30.0s). 22D - By definition, the average speed is the distance (for a half circle: r) divided by the time duration. 25E - Average acceleration= total velocity change/total time interval. Total velocity change is 3.14m/s * 2 because we go from 3.14 m/s due north to 3.14 m/s due south. Then we have acceleration = 2*3.14 m/s/30.0s= 0.209 m/s 2 27C - V f =V i +at= 30 m/s -3.00m/s 2 * 4.00s=18.0 m/s, West 28C - V-south= 3.00m/s 2 *4.00s = 12.0m/s V-west = 30m/s |V| 2 =(12.0m/s) 2 +(30m/s) 2 = 1044 m/s 2 ; |V| = 32.3 m/s, tan(angle) = -12/30, therefore angle = -21.8 degrees (

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