Question

1) Calculati timpul in care lumina parcurge distanta pamant-luna(dpl=384.000Km),distanta pamant-soare(dps=149.500x10³ Km),precum si distanta steaua polara-pamant(460 ani lumina),considerand ca un an are 365 zile si stiind ca 1 an lumina reprezinta distanta parcursa de lumina in timp de 1 an (c=300.000 Km/s).


2)Cat timp i-ar trebui sunetului sa parcurga distantele pamant-luna si pamant-soare (viteza sunetului=340 m/s)

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Answer 1

$\boxed{\bold{1.}} \ v=299\ 792 \ 458 \ m/s\\ d_1=384 \ 000 \ km=384 \ 000 \ 000 \ m \\ d_2=149 \ 500 \cdot 10^3 \ km=149 \ 500 \ 000 \ km=149 \ 500 \ 000 \ 000 \ m \\ d_3=460 \ a-l=9 \ 460 \ 730 \ 472 \ 580 \ 800 \ m \\\boxed{t_1-?} \\ \boxed{t_2-?} \\ \boxed{t_3-?}\\ \bold{Rezolvare:} \\ \boxed{v=\frac{d}{t}} \ \ \ \Rightarrow t=\frac{d}{v} \\ t_1=\frac{d_1}{v}, \ \ \ \ t_2=\frac{d_2}{v}, \ \ \ \ t_3=\frac{d_3}{v}; \\ Inlocuiesti \ si \ calculezi; \\ \boxed{\bold{2.}} \ v=340 \ m/s$
$d_1=384 \ 400 \ km=384 \ 400 \ 000 \ m \\ d_2=150 \ 000 \ 000 \ km=150 \ 000 \ 000 \ 000 \ m \\ \boxed{t_1-?} \\ \boxed{t_2-?} \\ \bold{Rezolvare:} \\ \boxed{v=\frac{d}{t}} \ \ \ \ \Rightarrow t=\frac{d}{v} \\ t_1=\frac{d_1}{v}, \ \ \ \ \ \ t_2=\frac{d_2}{v}. \\ Inlocuiesti \ si \ calculezi.$