A block of weight W is pulled along a horizontal surface at a constant speed v by a force F, which acts an angle theta with the horizontal, as shown to the left. The normal force exerted on the block by the surface has magnitude A) greater than zero but less than W

B) Equal to W

C) Zero

D) greater than W

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.