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Chapter 3 Kinematics in Two Dimensions. 3.1 – d, v, & a. A bullet is fired horizontally. A second bullet is dropped at the same time and at from the same height as the first bullet. Ignoring air resistance, which bullet will hit the ground first?. …DEMONSTRATION….
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Chapter 3 Kinematics in Two Dimensions
3.1 – d, v, & a A bullet is fired horizontally. A second bullet is dropped at the same time and at from the same height as the first bullet. Ignoring air resistance, which bullet will hit the ground first? …DEMONSTRATION…
3.2 – Kinematics Equations in 2-D Same equations as Chapter 2. Break the problem down into x and y directions; solve equations separately. The x component does not affect the y component of the motion.
ASSIGN: Ch. 3 #14-26 (evens) Due Thursday
1. A bus moving at a speed of 20 m/s begins to slow at a rate of 3 m/s each second. Find how far it goes before stopping. 66.7 m
2. An object starts from rest with constant acceleration of 8 m/s2 along a straight line. Find • the speed at the end of 5 seconds. • (b) the average speed for the 5 second interval, and • (c) the distance traveled in the 5 seconds. (a) 40 m/s, (b) 20 m/s, (c) 100 m
3. A stone is thrown straight upward and it rises to a height of 20 m. With what speed was it thrown? (a) -17.4 m/s, (b) 3.8 s
4. A projectile is fired horizontally with a velocity of 30 m/s from the top of a 80 m high cliff. • How long will it take to strike the level ground at the base of the cliff? • How far from the foot of the cliff will it strike? • With what velocity (vector) will it strike? (a) T = 4.04 s, (b) 121m, (c) 50.0 m/s @ 53° S of
5. A baseball is thrown with an initial velocity of 100 m/s at an angle of 30° above the horizontal. How far from the throwing point will the baseball attain its original level? 884 m