A 1200 kg car travels around a circular track of radius 100 m at constant speed, completing one lap every 45 seconds. What is total the force of friction between the tires and the road? Assume the track is horizontal, not banked.  2044 N  2339 N  None of these  2672 N  2819 N

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.