2 A writing desk stands on a base of external dimensions 80 cm x 70 cm and internal
dimensions 70cm x 50 cm (see diagram). The
total weight of the desk and base is 400N.
Calculate the average pressure the desk
exerts on a horizontal floor, (i) in Ncm, and
(i) in Pa.

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.