Now the elevator is moving downward with a velocity of v = -3.5 m/s but accelerating upward with an acceleration of a = 4.4 m/s2. (note: an upward acceleration when the elevator is moving down means the elevator is slowing down.) what is the force the bottom spring exerts on the bottom mass?

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

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

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm