Photochemical smog, lowered air quality, and increased greenhouse gas release is much more common in urban areas compared to rural areas. what explains the lowered air quality association with urban areas?

a. rural areas have more green spaces that filter the air through plants.

b. more fossil fuels are used for combustion in industry and cars, which are more concentrated in urban areas.

c. urban areas have higher levels of litter and solid waste from population dense neighborhoods.

d. urban areas have less water recharge zones, causing particulates and pollutants to evaporate into the air rather than infiltrate into the ground.

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.