A student is pushing a 70kg box across a floor by applying a 427N force to the right. The coefficient of static friction between the box and the floor is 0.6 and the coefficient of kinetic friction is 0.52. Neglect drag. How many forces are acting on the box? how many forces are acting on the box? ​

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?