A crate of mass 40 kg sits on a level surface that has friction. An applied force of 250 N at some angle below the horizontal acts on the crate so that it moves horizontally at a constant speed. The force and its x and y components are shown in the diagram. The normal force acting on the crate will be most nearly... A. 640 N
B. 540 N
C. 390 N
D. 240 N
AND for the same crate as the previous problem, moving at constant speed, the force of friction acting on the crate must be nearly...
A. 100N
B. 200N
C. 225N
D. 500N

On a hot saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 22degreesc. at noon the air conditioner is turned off, and the people go home. the temperature outside is a constant 33degreesc for the rest of the afternoon. if the time constant for the building is 4 hr, what will be the temperature inside the building at 4 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? at 6 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? when will the temperature inside the building reach 24degreesc? 324281