If the force on a body at a certain point is known to be zero, does this necessarily imply that the potential energy is zero at that point?

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

What are the three ways that an object can accelerate