022 (part 1 of 3) 10.0 points A 1530 kg car accelerates uniformly from rest to a

Question

022 (part 1 of 3) 10.0 points A 1530 kg car accelerates uniformly from rest to a speed of 18.6 m/s in 3.92 s. Find the work done by the net force on the car during this time interval. Answer in units of J part 2 023 (part 2 of 3) 10.0 points Find the average power delivered by the net force to the car in this time interval. Answer in units of W part 3 024 (part 3 of 3) 10.0 points What is the instantaneous power delivered by the net force to the car at 2 s? Answer in units of W 025 (part 1 of 2) 10.0 points

Explanation / Answer

(a)a= v/t = 18.6 / 3.92 = 4.745 m/s^2 ;S= 1/2at^2 = 36.456 m; Force = Ma = 1530 * 4.745 = 7259.85 N ; the work done by the net force = F.d= 7259.85 * 36.456 = 264665.1 J (b) Power delivered = Work done / Total time = 7259.85 / 3.92 = 1852 J/s (C) Velocity at t=2.0 V = at = 4.745 *2 = 9.49 m/s ; Instantaneous Power = F.v = 7259.85 * 9.49 = 68895.97 J

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