Irodov – Problems in General Physics

/

/ ,

/ / / / /^ / /

11./2

(6)

g

A

2/2

/ /

/ / / /

/

,

Am./

4.156. See Fig. 33.

4.157. AT = — In (1 — r1) =0.3 rad.

4.158. r = (ai r, a 2 r 2 )/(ai az).

4.159. (a) 17 = 1117 r:/r) - 0.08 rn-i; (b)^ — 2van^ ° =15 cm/s.
4.160. (a) See Fig. 34a. The particles of the medium at the points
lying on the solid straight lines (y = x ± nk, n = 0, 1, 2,.. .)

0

Fig. 33.

oscillate with maximum amplitude, those on the dotted lines do

not oscillate at all.

(b) See Fig. 34b. The particles of the medium at the points lying

on the straight lines y = x ± nX, y = x ± (n ± 1/2)? and y =

= x ± (n ± 1/4)? oscillate respectively along those lines, at

/

2,1^7

/ / /

// /

/

2 22 x

(a)

Fig. 34.

right angles to them, or move along the circles (here n = 0, 1, 2,.. .).

At all other points the particles move along the ellipses.

4.161. (w) = 2 / 3 w 0.

4.162. (0) = 2n/ 2 / 0 (1 — 20 laW.

• 171±(fig) 2
  4.163. (01))= P/V 1+ (2R/h) 2 — 0.07 W.