In the picture below, how could the man make it easier to lift the stone with the lever?
a) use two boards instead of one board.
b) move the fulcrum farther away from the stone.
c) move the stone to farthest end of the board.
d) move the fulcrum closer to the stone.

Which atomic model was proposed as a result of j. j. thomson’s work?

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

Which of the following is not associated with mechanical energy? a. motion b. position c. density d. shape