The moist greenhouse effect refers to
A) the warming process by which water vapor rises into the upper atmosphere above the ozone layer where it is then broken apart by ultraviolet radiation
B) the point at which water is evaporating from the surface at a faster rate than it is condensing
C) the natural greenhouse effect due to clouds of water vapor in the lower atmosphere
D) an enhanced greenhouse effect above tropical regions of the Earth's surface
Question 2
A horizontal force of 5.0 N accelerates a 4.0 kg mass, from rest, at a rate of 0.50 m/s2 in the positive direction. What friction force acts on the mass?
A) +3.0 N
B) -3.0 N
C) +2.0 N
D) -2.0 N
E) -3.3 N
