To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). The density of air is 1.2 kg/m3. (a) What are the drag forces in newtons at 77 km/h and 105 km/h for a Toyota Camry? (Drag area = 0.70 m2 and drag coefficient = 0.28.) at 77 km/h N at 105 km/h N (b) What are the drag forces in newtons at 77 km/h and at 105 km/h for a Hummer H2? (Drag area = 2.44 m2 and drag coefficient = 0.57.) at 77 km/h N at 105 km/h N Supporting Materials 4 Physical Constants '2 Points] MY NOTES 2, drag coefficient: 0.45, density of water to be 1000 kg/m3, and density of air to be A spherical raindrop 4.1 mm in diameter falls through a vertical distance of 4500 m. Take the cross-sectional area of a raindrop = nr 1.2 kg/m3. (a) Calculate the speed a spherical raindrop would achieve falling from 4500 m in the absence of air drag. m/s (b) What would its speed be at the end of 4500 m when there is air drag? (Note that the raindrop will reach terminal velocity after falling about 30 m.) m/s