Tricky Dynamics Kinematics Trajectory Problem

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SUMMARY

The discussion centers on calculating the minimum angle θ required for a football player to successfully kick a field goal of 29 yards, with the ball reaching a height of 10 feet. The player imparts a velocity of 95 ft/sec to the ball. To solve this problem, participants emphasize the need to combine projectile motion equations, particularly focusing on the height formula and ensuring it has real roots. The range of the kick is established at 87 feet, which is crucial for determining the angle.

PREREQUISITES
  • Understanding of projectile motion equations
  • Familiarity with trigonometric functions, specifically tangent
  • Knowledge of kinematic equations
  • Ability to manipulate algebraic expressions
NEXT STEPS
  • Study the derivation of projectile motion equations
  • Learn how to apply the quadratic formula to determine real roots
  • Explore the relationship between angle, range, and height in projectile motion
  • Investigate the effects of initial velocity on trajectory calculations
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in solving real-world applications of projectile motion, particularly in sports dynamics.

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Homework Statement



A football player attempts a 29-yd field goal. If he is able to impart a velocity u of 95 ft/sec to the ball, compute the minimum angle θ for which the ball will clear the crossbar of the goal. The crossbar is 10 ft above the ground. (Hint: Let m = tan θ.)


Homework Equations

I can't find and equation for minimum angle anywhere, which makes me think I have to combine two equations to be able to solve this. I've messed with equations on here, http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html#tracon for hours and I can't figure out what equations I need to combine to get a minimum angle.



The Attempt at a Solution



I know my range is 87 feet, and the height that i want to clear is 10 feet at the end of my range, kicking the field goal at the smallest initial angle possible. Velocity is 95 ft/s

Any help on this is appreciated, it may simply be one of those problems where the solution seems too easy so it is overlooked?
 
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well draw figure and you'll understand that range is not 29 yd
question says that when x= 29 yd ... y should be 10 ft
 
I've had a look at this question, it was by no means easy. Here's a hint: the formula for the height of the ball versus time must have real roots.
 

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