Which statement best summarizes the central idea in this excerpt?

before the civil war, most enslaved people were living in the southern part of the union.
the union fought in the civil war because they wanted to strengthen, perpetuate, and extend slavery.
the civil war occurred because people in the south wanted to protect and spread the practice of slavery.
before the civil war, the government did not try to stop slavery, but only tried to keep it from growing.

You are sitting on the beach and wondering about the properties of mechanical waves. describe them in terms of ocean waves.

What is the mass of the same rock on the earth

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)