A 1.04-kg binder is initially at rest on a wood desk. The binder is then pushed with a constant force of 4.2 N. Friction with a magnitude of 1.8 N is exerted on the moving binder by the surface of the desk. Draw an energy bar chart of the situation. Then determine the final velocity of the binder after it has been pushed 0.70 meters across the table.

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?