Question

6.11.Un hard disk are diametrul D=8,8 cm si turatia n=7200rpm (rotatii pe minut). Calculati viteza punctelor aflate la periferia disculuin​

Answer 1

Raza discului R=4.4cm=0.044m

Turatia n=7200rpm=7200/60 rot/s=120 rot/s

Viteza unghiulara: omega=2*pi*n=2*pi*120=240*pi rad/s

Viteza periferica: v=omega*R=240*pi*0.044=33.17m/s

In km/h: v=33.17*3600/1000=33.17 * 3.6 = 119.43km/h

Raspuns: v=119.43km/h.

Daca aproximam: v=120km/h