A compound machine is made up of two simple machines. The first machine has MA = 0.64. The second machine has MA = 0.23. Third machine has MA = 0.87 What is the mechanical advantage of the compound machine?

In a system, when potential energy decreases, then entropy also decreases. true false

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.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?