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Section 61 Sets and Set Operations Sets A set is a welldefined collection of objects The objects in this collection are called elements ofF A→B = F B→A F A→B kracht A op B (N) F B→A kracht van B op A (N) Zwaartekracht F z = m·g F z = zwaartekracht (N) m = massa (kg) g = 9,81 m/s 2 (op aarde) Veerkracht F v = C·u F v = veerkracht (N) C = veerconstante (Nm1 u =uitrekking (m) Luchtweerstand F w,l = ½ ρ C W A v 2 F w,l = luchtwrijving (N) ρ = luchtdichtheid (kg9 S Æ p x $ p { h # Ë q Æ Í p x 9 S U Æ Í U q t # Ë x t s µ 40 µ 80 µ1 µ1 µ150 µ0 µ250 0 0 0 0 0 0 0 µ 7 µ 7 µ 8 µ10 µ12 µ15 µ18 0 0 0 0 0 0 0 µ 5 Nasa Gov ƒ~ƒfƒBƒAƒ€ƒ{ƒu ƒfƒWƒ^ƒ‹ ƒp[ƒ} ƒ~ƒfƒBƒAƒ€ 40 'ã