Andy pulls a toy car with a rope that is 60° to the horizontal. If he exerts a constant force of 20N as he pulls the car 10. meters, how much work has he done?

What is the angular momentum of the bar about the axle?

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?

When a metal and an bond they do not share electrons