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Vertical shot

16. Elk van de koorden is 20 m uitgerekt dus oefent een kracht van 5,35 kN uit (zie figuur 9) 5,35

Zo'n kracht is 3,9 cm lang: 1 cm staat dus voor –––– = 1,37 kN 3,9

De somkracht is 7,2 cm en staat dus voor 7,2 @ 1,37 = 9,9 kN

Ook goed: de hoek tussen de twee getekende krachten is 44o

½ F o

cos 22 = –––– ! F o = 9,9 kN 5,35

17. F res = m @ a 9,8 @ 10 3 – 250 @ 9,8 = 250 @ a ! a = 29 m/s 2

18. Vanaf het moment dat | F z | >_ | F veren | is de versnelling naar beneden gericht en neemt de snelheid dus af.

F veren = 250 @ 9,81 = 2,45 kN geldt op een hoogte van 16 m (zie figuur 11)

19. W elastieken = mg @ h max

De totale arbeid door de elastieken verricht = de oppervlakte onder de gegeven grafiek:

27 hokjes à 4 kNm levert 108 kNm

! 108 @ 10 3 = 250 @ 9,81 @ h max ! h max = 44 m

Eindexamen natuurkunde 1 vwo 2003-II

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