Which statement below best describes the quantum view of light and matter? a. light behaves like a wave sometimes, and sometimes like a particle; matter always behaves like a particle. b. light behaves like a wave, and matter behaves like particles. c. both light and matter behave like particles. d. both light and matter behave like waves sometimes, and sometimes like particles.

Idon’t quite understand this problem

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.