The dog is trying to keep himself from moving. The person is pulling on his leash, with a force of 150 N at an angle of 30° from horizontal. What is the minimum coefficient of friction that will make this possible?
Right now, I am at (10, -30), moving to the right at 10 m/s. Five seconds from now, I want to be at (10, 20). What should my acceleration vector be?
A particular office building tends to sway back and forth, ten times per minute. The amount of sway is modest, but the engineers are concerned that it might make the building vulnerable to earthquakes, even very small ones. Why?
In the circuit shown above, use Thevenin equivalents to find the total resistance felt by the battery, and use that to find the current out of the battery. Then, determine the amount of current going through each other branch.
I rub a balloon against my hair, and hold it close to a large metal plate. I notice that a neutral foil ball hung near the far side of the plate (A) is being attracted to it. Explain why.