Where does the name "black hole" get it's name?

How would a small bar magnet be oriented when placed at position x?

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?