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# HW 9 - 8.30 A 500 g ball swings in a vertical circle at the...

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8.30] A 500 g ball swings in a vertical circle at the end of a l.5-m-long string, When the ball is at the bottom of the circle, the tension in the string is 15N, What is the speed of the ball at that point? k.n ot>...:! '1 \ " (\..r) ~ C>. S- K.."}) y -:.- , '\$' '\'Y) J T:::.. \ S-- N - -- --t \Y --:-") r~ 'J] Mo.h,e.-Irl\~ co-l ~<y'YQJ)~ ~~"') ~~ ~ ~ ~'Y" ~ T - F~ -:::. . 'l.. Q'f', ~ -:. IS' N ~ ""I'd C:>Y',\91- -:. S l \ \$ N - 0 'S 'X~ 'a'~ (j \$' ~ 30'~ . I

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8.33] A 6.60 g coin is placed 15.0 cm from the center ofa turntable. The coin has static and kinetic coefficients of friction with the turntable surface of )1"= 0.770 and Ilk = 0.470. What is the maximum angular velocity with which the turntable can spin without the coin sliding? 1>(,- ~-r-lo l.. ~,~ ~~ ~ ~ '(..V1Do>"'11 : 'r'!J...c"b 1<1t>-)\(" r2t1'1s..A~ o J J ~K~~'q1J ~.\-:..O':+~ W ~ Co t:) 'Y' \> 1'0 y 1'-1\.~~ ~ oJ) t.c;J ~'fQ/.>~ 1-AA ~V) 1, ~ fy ~ 1s wfi ():J1. 'Y' -:. }J. S w6 d ~ ~J¥ "":./ 0'11- 7\ Cj'~ a \S' ~ +'OO)TtY Ij
~~~J A conicalpendulum is formed by ~ttachinga 0.100 kg ball to a 1.00m-Iong string, then allowing the mass to move in a horizontal circle of radius 40.0 cm. The figure shows that the string traces out the surface of a cone, hence the name.

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