What is the net force of this object? f air=400n f grav=600n a) 0 nuetons b) 200 nuetons c) 400 nuetons d) 600 nuetons

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

What are the necessary conditions for fusion?