In class, we read an article about "Absolute Zero". Using what you know about particles/molecule motion, choose the option that best represents the explanation of what absolute zero is.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

How is the acceleration of an object in uniform circular motion constant? a - in magnitude only b - in direction only c - in both magnitude and direction d - in magnitude, direction & orientation

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.