Question

A truck accelerates uniformly from rest to 23.0 m/s in 5.4 s along a level stretch of road. Determine the average power (in W) required to accelerate the truck for the following values of the weight (ignore friction). (a) 8.00 x 103 N X 9036000 Can you write an expression for the average power in terms of the vork done on the truck and the time over which this work occurs? How does the work done on the truck compare to its change in kinetic energy? Can you write an expression for the change in kinetic energy for the truck in termns of its final and initial speed? Don't forget, you have been given the weight of the truck, not the mass. W (b) 1.50 x 10 N 1863000 Since only the weight of the truck has changed, how do the statements made in (a) above apply to this case? W X Supporting Materials

Answer 1

Weight, Wi=8x103N V = 23 mg ts 5.45 average paw pa Imrg² {mvi ? time P= ung Vf ²-0 - 8X103 x 232 2X9.88 5.4 [: = 3.9984-88 w ] - = 4x1otw if W2 = 1.500 104N = 4xlotole Þ= 1.50x/0+ x 232 2x9.0 X 5.4 P₂= 74971-65 W €7.5 Xlo to v