The reason the velocity we measured was lower than the velocity we predicted is that some of the kinetic energy of the marble was converted to thermal energy during the collision. Also, after the collision, air friction and bending in the pendulum rod converted more kinetic energy into thermal energy. Does this explanation match with the your results

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

The energy equivalent of the rest mass of an electron is