Which of these is the most likely reason why the auroras are sometimes seen at northern ohio although it is at a much lower latitude than the north pole

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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)

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?