Plsss help me with physics

When on a roller coaster ride would a person have sensations of weighing less than normal and when they would have sensations of weighing more than normal? Include forces and accelerations!

Most of the volume of an atom is occupied by the

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600

During the past 150 years in the united states, how did energy consumption compare to population growth