A rollercoaster traveling at a velocity of 30 m/s takes 8 seconds to climb a hill. After 8 seconds, its velocity is 12 m/s. What is its acceleration?

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.