Which statement about spending the day of January 15th in the cities of Chicago and Sydney is true?
A Both cities will be experiencing winter.
B Both cities will be experiencing summer.
C Chicago will be experiencing winter, while Sydney is experiencing summer.
D Chicago will be experiencing summer, while Sydney is experiencing winter.

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 coefficient of kinetic friction μk between the block and the tabletop?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?