A car has a frontal projected area of 1.6 m² and travels at 60km/hr. It has a drag coefficient of 0.35 based on frontal area. Calculate the power required in kW to overcome wind resistance by the car. 3 Density of air= 1.2 kg/m

Problem 15.15 A 5000-N car hits the crash barrier at 80 km/h and is brought to rest in 0.11 seconds. What average power is transferred from the car during the impact?

Estimate the power needed to overcome the aerodynamic drag of a person who runs at a rate of 100 yds (300 ft) in 10 seconds into a 29.3 ft/s head-wind. Express your answer in terms of horsepower. Assume CDA = 9 ft2 for the runner. NOTE: ρAIR = 2.38x10-3 slugs/ft3, 1 horse power = 550 lb∙ft/sec.

A 10-m-long glider with a mass of 680kg (including the passengers) is gliding horizontally through the air at 24 m/swhen a 60kg skydiver drops out by releasing his grip on the glider.