15 points which of the following pairs of objects could not have a magnetic force acting between them? (4 points) select one: a. two metal spoons b. a piece of iron and a magnet c. two magnets d. a block of wood and a metal spoon

Ways that industry and agriculture use physical properties to separate substances

How many neutrons does plutonium -196 with an atomic number of 78.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.