ch3_writeup

# ch3_writeup - kicked the ball leaves the ground with a...

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1. The fastest recorded pitch in Major League Baseball, thrown by Nolan Ryan in 1974, was clocked at 162.3 km/h (100.8 mi/h). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 18.3 m (60.0 ft) away? Angled Projectiles Wednesday, October 18, 2006 10:16 AM Physics NoN Page 1

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WA 15 (415927) 1. A daredevil is shot out of a cannon at 46.0 ° to the horizontal with an initial speed of 26.0 m/s. A net is positioned a horizontal distance of 50.0 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil? [14.2] m (a) By how much does the ball clear or fall short of the crossbar? (Give a positive answer if the ball clears the crossbar, or a negative answer if it falls short of the crossbar.) [23.9] m 2. A place kicker must kick a football from a point 36.0 m (about 40.0 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When

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Unformatted text preview: kicked, the ball leaves the ground with a speed of 33.0 m/s at an angle of 48 ° to the horizontal. wa15_answers Monday, October 23, 2006 7:20 PM WA Answers Page 1 (b) Does the ball approach the crossbar while still rising or while falling? (Type 'rising' or 'falling', or 'neither' if it falls short of the crossbar.) [rising] What is the vertical component of velocity of the ball at this time? (Assume the positive direction is upward.) [8.53] m/s WA Answers Page 2 3. A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 252 m/s at an angle of θ = 75 °, how close to the enemy ship does the projectile land? [127] m WA Answers Page 3 How close (vertically) does the projectile come to the peak? [324] m Figure 3.29 WA Answers Page 4...
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## This note was uploaded on 05/06/2011 for the course PHYS 103N taught by Professor Chiu during the Spring '11 term at University of Texas.

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ch3_writeup - kicked the ball leaves the ground with a...

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