Chapter 4 Physics Notes

# Dart will not travel in a straight line but rather in

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dart will not travel in a straight line, but rather in a parabolic path like any other projectile. In order to hit the monkey with the dart, where should you point the gun before shooting? 1 Right at the monkey 2 Below the monkey 3 Above the monkey

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1/5/11 PROBLEM: Motion in 2D Two footballs are thrown from the same point on a flat field. Both are thrown at an angle of 30 degrees above the horizontal . Ball 2 has twice the initial speed of ball 1 . If ball 1 is caught a distance D1 from the thrower, how far away from the thrower D2 will the receiver of ball 2 be when he catches it?
1/5/11 JUGGLER The distance between the juggler’s hands is 0.92 meters and the acceleration due to gravity is −9.8 m/s2. What are possible initial x and y velocities to send each object from one hand to the other, so that he will juggle all objects at once. A) Vxi=3 m/s , Vyi=1.5 m/s B) Vxi=1.5 m/s, Vyi=3 m/s C) Vxi=2 m/s, Vyi=2.25 m/s D) all of the above

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1/5/11 QUESTION #3 A battleship simultaneously fires two shells at enemy ships from identical canons. If the shells follow the parabolic trajectories shown, which ship gets hit first? 1. Ship A. 2. Ship B. 3. Both at the same time.
1/5/11 HANG TIME A basketball star covers 2.8 m horizontally in a jump to dunk the ball. His motion through space can be modeled precisely as that of a particle at his center of mass . His center of mass is at elevation 1.02 m when he leaves the floor. It reaches a maximum height of 1.85 m and is at elevation 0.9 m when he touches down again. Determine : (1) his time of flight (his hang time). (2) his horizontal and vertical velocity components at the instant of takeoff. (3) his takeoff angle.

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