Arunner hopes to complete the 10,000m run in less than 30,0min, after running at constant speed for exactly 27.0 min , there are still 1100m to go . the runner must then accelerate at 0.20 m/s2 for how many seconds in order to achieve the desired time ?

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?