Calculating Time for Javelin Throw Angle Change

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SUMMARY

The discussion focuses on calculating the time required for a javelin, launched at a speed of 29 m/s at an angle of 36 degrees, to reduce its launch angle to 18 degrees. Participants emphasize the need to determine the vertical component of the initial velocity using trigonometric functions and apply kinematic equations to find the time when the vertical speed corresponds to the new angle. The key equations involve resolving the initial velocity into vertical and horizontal components and utilizing the equations of motion to solve for time.

PREREQUISITES
  • Understanding of projectile motion principles
  • Knowledge of trigonometric functions for angle calculations
  • Familiarity with kinematic equations
  • Ability to resolve vectors into components
NEXT STEPS
  • Study the derivation of projectile motion equations
  • Learn how to calculate vertical and horizontal components of velocity
  • Explore the application of kinematic equations in projectile motion
  • Practice problems involving angle changes in projectile trajectories
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and projectile motion, as well as educators seeking to enhance their teaching methods for related topics.

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Homework Statement


In the javelin throw, the javelin is launched at a speed of 29m/s at an angle of 36degrees above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to be reduced to 18degrees?

Homework Equations


I can't find anything nor have we had any problems like this before.


The Attempt at a Solution


I'm sorry to say I can't even begin this problem. Anything that would point me in thr right direction would be great.
 
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Figure out the vertical speed from the initial speed and the angles. Then use the kinematics equations to find out when the vertical speed would decrease to the speed you calculated.
 

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