Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing?

Which statement is true about an object that is moving in a circular motion due to centripetal force, f, when the radius of its circular motion is doubled? the new force then becomes equal to 2f the new force then becomes equal to f the new force then becomes equal to f/2 the new force then becomes equal to f2 the new force then becomes equal to 1/f

Heating water for hot cocoa while sitting next to a campfire can be examples of conduction, convenction and radiation at the same time agree disagree it depends how you know

Newton's second law states that f = m x a (force is mass times acceleration). which example would have the greatest acceleration?