Keller’s third law describes the relationship between the average distance of a planet from the sun and the planets...
a) orbital speed
b) size
c) distance to the sun
d) gravitational attraction

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.