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                                                                                                                                                                         20/05/09
                                        Un problema e due lingue, quale paese sarà vincitore?
                                                              Un problema per mettere alla prova le vostre abilità in fisica...
                                                          A problem to test yourself in physics...italiano, english.

 

                                                                                    
 it La figura mostra un fucile che spara ad una massa M. Tale massa è trattenuta da un’elettrocalamita che smette di funzionare nell’istante in cui il proiettile di massa m esce dalla canna velocità v0.

Detta d la distanza del fucile dall’oggetto e h l’altezza dell’oggetto stesso dire

quanto vale l’angolo α di alzo in funzione dei precedenti valori.

Supposto l’urto completamente anelastico, a che distanza x dal fucile cadrà l’oggetto?

Un simpatico astronauta texano fa lo stesso esperimento sulla Luna, cosa cambierà?

Supporre gli oggetti puntiformi.

 

enThe picture shows a gun inclined of an angle α from the ground. A mass M is hold at an height h and it has a horizontal distance d from the gun.
A mass m is shot by the gun with an initial velocity v0 towards M, that begins to drop without any initial velocity as soon as the gun shots. Considering no air drug, what is the angle α related to h, d, v0 in order to make m and M collide?
The collision is anelastic. Determine the horizontal distance x from the gun where the masses touch the ground.
A funny astronaut from Texas carries out the experiment on the Moon. What will happen?

 

 

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                                                                                                                                                                     Valeria B., IVF Liceo Alessi, Perugia 
                                                                                                                                          Liceo Lurçat, Martigues 
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