A rock is dropped from a tall building and is heard to hitting the ground 7.17 s after being dropped. Determine the height of the building. Round to one decimal places.

Which best represents the law of conservation of mass ?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)