Page 102 - index
P. 102
wW S d 30,1 ɫɦ / c 2 , wn S2 d 25 ɫɦ / c2 , ɧԛɤɬɟɧɿԙ ɬɨɥɵԕ ԛɞɟɭɿ
2 8
w wW2 wn2 40 ɫɦ / c 2 .
2-ɟɫɟɩ. Ɋɚɞɢɭɫɵ R 0,5 ɦ ɲɤɢɜɤɟ ɿɥɿɧɝɟɧ ɬɟɦɿɪ ɚɪԕɚɧԑɚ (ɬɪɨɫԕɚ) A ɠԛɝɿ
ɿɥɿɧɝɟɧ (18-ɫɭɪɟɬ).
18-ɫɭɪɟɬ
ɀԛɤ ɚɥԑɚɲԕɵ ɨɪɧɵɧɚɧ w 2 ɦ / c2 ԛɞɟɭɦɟɧ ɬԧɦɟɧ ԕɚɪɚɣ ԕɨɡԑɚɥɵɩ,
ɲɤɢɜɬɿ ɚɣɧɚɥɞɵɪɚɞɵ. ɒɤɢɜɬɿԙ ɚɣɧɚɥɭ ԕɨɡԑɚɥɵɫɵɧɵԙ ɬɟԙɞɟɭɿɧ, ɨɧɵԙ ɤɟɡ
ɤɟɥɝɟɧ ɭɚԕɵɬɬɚԑɵ ԕɨɡԑɚɥɵɫɵɧɵԙ ɛԝɪɵɲɬɵԕ ɠɵɥɞɚɦɞɵԑɵɧ, ɛԝɪɵɲɬɵԕ
ԛɞɟɭɿɧ ɠԥɧɟ ɲɤɢɜ ɬɨғынының M ɧԛɤɬɟɫɿɧɿԙ ɛԝɪɵɲɬɵԕ ɠɵɥɞɚɦɞɵԑɵ
ɦɟɧ ɛԝɪɵɲɬɵԕ ԛɞɟɭɿɧ ɚɧɵԕɬɚɭ ɤɟɪɟɤ.
ɒɟɲɿɦɿ. ɒɤɢɜ ɬɨғɵныɧԛɤɬɟɥɟɪɿɧɿԙ, ɨɧɵԙ ɿɲɿɧɞɟ M ɧԛɤɬɟɫɿɧɿԙ
ɠɵɥɞɚɦɞɵԑɵ ɠԛɤ ( Ⱥ ) ɠɵɥɞɚɦɞɵԑɵɦɟɧ ɛɿɪɞɟɣ ɛɨɥɚɬɵɧɵ ɚɧɵԕ, ɹԑɧɢ
vM vA . ɀԛɤ ɬɟԙ ԛɞɟɭɦɟɧ ԕɨɡԑɚɥɚɬɵɧ ɛɨɥԑɚɧɞɵԕɬɚɧ, ɲɤɢɜɬɿԙ ɚɣɧɚɥɭ
ԕɨɡԑɚɥɵɫɵɧɵԙ ɬɟԙɞɟɭɿ (ɨɧɵԙ ɤɟɡ ɤɟɥɝɟɧ ɭɚԕɵɬɬɚԑɵ ԕɨɡԑɚɥɵɫɵɧɵԙ
ɠɵɥɞɚɦɞɵԑɵ)
vM vA ɚ t 2t ɦ / c
ɬɟԙɞɿɝɿ ɚɪԕɵɥɵ ԧɪɧɟɤɬɟɥɟɞɿ.
25-ɮɨɪɦɭɥɚ ɛɨɣɵɧɲɚ:
Z v 2t 4t 1/ c .
R 0,5
ɒɤɢɜɬɿԙ ɛԝɪɵɲɬɵԕ ԛɞɟɭɿ:
H dZ 4 1/c2 .
dt
Ȼԝɪɵɲɬɵԕ ɠɵɥɞɚɦɞɵԕ ɬԝɪɚԕɬɵ, ɚɥ M0 0 ɠԥɧɟ Z0 0 ɛɨɥԑɚɧɞɵԕɬɚɧ
100
