Example 7-15 depicts the following scenario. To pass a slow-moving truck, you wa

Question

Example 7-15 depicts the following scenario. To pass a slow-moving truck, you want your fancy 1.30 × 103 kg car to accelerate from 13.4 m/s (130.0 mi/h) to 17.9 m/s (140.0 mi/h) in 3.00 s. Now we will consider some slightly different related scenarios to Example 7-15 Part A Suppose the car has a mass of 1700 kg and delivers 58 hp to the wheels. How long does t take for the car to increase its speed from 15 m/s to 25 m/s? Express your answer using two significant figures Submit Part B Would the time required to increase the speed from 5.0 m/s to 15 m/s be greater than, less than, or equal to the time found in part A? greater than O less than equal to Submit Request Answer

Explanation / Answer

1 hp = 746nW

58 hp = 746*58 = 43268 W

Power = force*velocity

43268 = F * 15

F = 2884.533 N

acceleration, a =F/m = 2884.533/1700

a= 1.696 m/s2

using, v=u+at

t = 25-15/ 1.696

t = 5.8962 s

b) again using

v=u+at

t = 15-5/ 1.696

t = 5.8962 s

equal to

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