A rock has a mass of 12.5 kg. It is dropped off a cliff that is 75.0 meters high. Find the Potential Energy of the rock at the top of the cliff. (b) What will the Kinetic ergy of the rock be just before it hits the ground. (c) What velocity will the rock have before it hits the ground? VENS w/Units Write Formula and Solve​

What are similarities and differences of reflection, refraction, diffraction and absorption?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?