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2、l o/ b N NT 6 _ ! b T“ LHNT LHNb4 U | 5TM $b10Assume a raindrop can be approximated as a sphere of diameter falling with velocity w, use dimensional analysis to obtain an exprssion for the drag force FD, as it fall through air of viscosity and density b 21Bav ZM I5 B M d 7: LFMWJO 5IPNTPO = X D #KFS
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5、M* BM / k p M*H b QUS“ o p ! Z_b T d 1Z b 5 ? 3 I M Z d p TS(0) TL(0)305m 5 k 9 V ob 9 | ML ob B b _ / )b N b $Z H i b k o p9 b l $ H M_ b K B b vM_ /V Mb kr / H _ / B S H*V B %Z% $ bL M / VB $ V H 27M B ( V 8 | I YZU /HC 1V b ! G S f G k Aw ZFiw oZb /)B _ B 2_ - _ 2NT $ M q9vN v $ 6 6 H b k p S H b Mb T 6V_ 2 k p r HMb ! 6 V k p ) L w qb / M M l H 2M_ $ M qhl k Z9 & b / LZ220uftx xV + = JG#!Gb ! “DPT L YDU B “ b k pMMb M1“ D | HM kv X sVJG! Q DGZ DPT 4QQ B LTJOL YDU ! Qf D o L _o Q b Z pN!M ! EGEZ ! Q ZsE p Y ZQU b Kva ua ub 28
