A cannonball is shot from a cannon at a launch angle of 63 and an initial velocity of 147 m/s. The gravitational acceleration is -9.8 m/s^2 . Assuming NO air resistance, how long the cannonball remain in the air. A.)40.2s
B.)13.4 s
C.)26.7 s
D.)9.8 s

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?