A simple marble is placed at the top of a hill. The initial potential energy of the marble is 550 J. The marble slides down the hill. You take a picture of the marble at some point as it is down the hill. Without knowing the speed, the mass or the position of the marble, which of the following could be the only possible correct energies of the marble at this point? Assume no friction Potential Energy = 310 J, Kinetic Energy = 180 J

Potential Energy = 140 J, Kinetic Energy 450 J

Potential Energy = 290 J, Kinetic Energy = 260 J

Potential Energy = 210 J, Kinetic Energy = 305 J

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Will give brainliest! which statement best describes the difference between strong nuclear forces and weak nuclear forces? weak nuclear forces are involved when certain types of atoms break down. strong nuclear forces are responsible for holding atoms' nucleus together. weak nuclear forces hold bonds between atoms together. strong nuclear forces hold together the nucleus of an atom. strong nuclear bonds prevent atoms from falling apart. weak nuclear bonds prevent compounds from falling apart. strong nuclear forces are involved in breaking electrons from their shells. weak nuclear forces hold protons in the nucleus.

Positrons are spontaneously emitted from the nuclei of