Quiz7Dsol - !"#$%%#&'(')*+,'! DL section _...

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Unformatted text preview: !"#$%%#&'(')*+,'! DL section _ Last 6 digits of student ID ______ Grade: 05/18/11 Last name , first name: ________________ ________________ First three letters of your last name ___ !"#$""%&#"'#(")*&+#,-./0.-)"'&#12+#34"5#-..#6"0'#5"'%#$*."5+#7(&5*'&#-."(*#58..#'*/*89*#("#/'*:8); P P !P -external " #t = Net Angular Impulseexternal = #$%&%'() -=rF %#'.'/+012'+3'24565+78'9:49;<+31'67/='65'5+>1 ')#<#=+>#&? #?63'678*:62'>4>175*> '@8(# <#A==#B#&# 67/'678*:62'01:49+5@'C8(#<#D#'-:8-(&E&*/#'.5')#<#F+G#&?#A196*31'4B'6+2'213+356791?'5?1'/+012'?63' :435'34>1'678:*62'>4>175*>='<?+9?'+3'74<'@H8(#<#>IJ#B#&#' 6C'D+::'5?1'678*:62'>4>175*>'9?625# Lin Diver Vinyl disc 300 J s (given) EF Lfin 276 J s -24 J s (into the page) (given) (into the page) AC'D+7/'5?1'>687+5*/1'4B'5?1'542G*1'-air resistance'6HH:+1/'I47'6012681C'/*2+78'5?1'+751206:'9473+/121/#'JKH:6+7# From the formula above we have the relation between the change in angular m omentum and torque applied for a certain time. Then we can easily find the average torque applied for the interval of 1.2 seconds between our measurements. |torque |= Delta(L)/Delta(t) = 24 J s / 1.2 s = 20 N m L#'.7'4:/'0+7@:'/+39'+3'24565+78'63'3?4<7'+7'5?1'B+8*21#'M5'?63'5?211'1K51276:'B42913'695+78' 47'+5#'N?65'621'5?1 '/+2195+47'67/'>687+5*/1' 4B'5?1 '542G*1' /*1'47:@'54 'KF #<#=+>#!O' JKH:6+7'+7'471'31751791'?4<'@4*'B+7/'+5# D% F _1 = 0.2 N and its arm is 12cm. Then the magnitude for the torque is | torque | = r x F_1 = 12 cm 0.2 N = 0.024 N m DS DL Following the right hand rule the direction is out of the paper (the torque is trying to make the disc rotate counterclockwise) 'Q9>'''R9> ...
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