Chapter 7 Homework x a https/Nwww webassign netweb/student/Asugnment-Responses/a

Question

Chapter 7 Homework x a https/Nwww webassign netweb/student/Asugnment-Responses/ast?dep 15952 c Search Fortis assyment you suteit answers by question ns. The number subessions remaining or ach question pat orly channes you submit hage anwer Assignment scoring Your last submission is used or your score -10 points A truck accelerates uniformly from rest to 20.s m/sin s 1 s along alevel stretch of road. Determine the average power required to accelerate the truck for the folowig values of the weight (ignore friction). a) 0.00 x 102 N 1.50 x 10 N Additional Materials Reading Show My Work

Explanation / Answer

The work done by the truck engine is given by the increse of kinetic energy:
W = 1/2 m v²
And the average power is therefore
P = W/t = m v² / 2t = w v² / 2gt (being w the weight)

(a) w = 8 x 10^3 N
P = 8.00 x 10^3 x 20.5² / (2 x 9.8 x 5.1) = 3.36 x 10^4 W

(b) w = 1.5 x 10^4 N
P = 1.5 x 10^4 x 20.5² / (2 x 9.8 x 5.1) = 6.3 x 10^4 W

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