Which of the following is a unit of density?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.