A 248 10 8 j b 112 10 7 j c 112 1010 j 10 d 234

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Unformatted text preview: ? a. 2.48 ×10 8 J. b. 1.12 ×10 7 J. c. 1.12 ×1010 J. 10 € d. 2.34 ×1010 J. € e. 4.67 ×10 J. € € € 8. A 8000 N car is traveling at 12 m/s along a horizontal road when the brakes are applied. The car skids to a stop in 4.0 s. How much kinetic energy does the car lose in this time? a. 4.8x104 J. b. 5.9x104 J. c. 1.2x105 J. d. 5.8x105 J. e. 1.2x106 J. 11.19.2010 Physics 1A (a) Fall 2010: Quiz 4 Version A 4 Equations and constants: 2 2 Ⱥ Ⱥ Ⱥ x = r cos θ Ⱥ Ⱥ r = x + y Ⱥ Ⱥ Ⱥ ; Ⱥ Ⱥ ; -1ȹ y ȹ Ⱥ y = r sin θ Ⱥ Ⱥ θ = tan ȹ ȹ Ⱥ ȹ x Ⱥ Ⱥ Ⱥ € € € € € € Ⱥ Δx = x f − x i Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ ; Ⱥ speed = d Ⱥ avg Ⱥ Ⱥ Ⱥ Δt Ⱥ Ⱥ Δv Ⱥ lim Ⱥ a = Δt →0 Δt Ⱥ Ⱥ0 ≤ fs ≤ µ s FN Ⱥ Ⱥ∑ F = 0; = 0 Ⱥ a Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ € Ⱥ € € Ⱥ Ⱥ Ⱥ ; Ⱥ fk = µ k FN Ⱥ ; ∑ F = ma Ⱥ ; PEgrav = mgh ; KE = 12 mv2 ; Ⱥ Δx Ⱥ Ⱥ Fg = mg Ⱥ Ⱥ F2 on1 = − F1 on2 Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ Ⱥ v = lim Ⱥ Δt →0 Δt Ⱥ Ⱥ 2 € = 1 k (Δx ) ; W = F Δx cosθ ; W net = W1 + W 2 + W 3 ...; W nc = ΔE mec ;€ 2 W E mec...
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