Help on Ballistic Pendulum Angle

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Homework Help Overview

The problem involves a ballistic pendulum scenario where a bullet strikes a block and the subsequent height and angle of rise of the block are to be determined. The subject area includes concepts from mechanics and trigonometry.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the use of free-body diagrams and trigonometric relationships to find the angle of rise. There is uncertainty about the applicability of certain geometric assumptions.

Discussion Status

Some participants have suggested methods involving trigonometric functions to relate height and angle, while others express confusion about the geometric configuration of the problem. A specific formula for calculating the angle has been proposed, but there is no consensus on its correctness.

Contextual Notes

Participants are navigating the challenge of applying trigonometric principles to a non-rectangular triangle formed by the pendulum's motion. There may be constraints related to the assumptions made about the geometry involved.

Naldo6
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Homework Statement




A bullet (m = 0.029kg) is fired with a speed of 95.00m/s and hits a block (M = 2.40kg) supported by two light strings , stopping quickly. Find the height to which the block rises.

The correct answer is 6.56E-02 m

BUt the next question is:

Find the angle (in degrees) through which the block rises, if the strings are 0.50 m in length.

i don't know how i get that angle... could anyone help please?...
 
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I think if you draw a free-body diagram and break each string into x and y components. you could use trig.

Sorry, don't know now exactly if this helps, but maybe it will.
 
nop... it doesn't function because the trangle formed isnot a rectangle one...
 
anyone know how to find that angle?...
 
yes i got it...

L - L cos(angle)= h

then we get:
angle = inverse cos ((L - h)/L )

for this exersice the correct answer is 29.68
 

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