In a room that is 2.41 m high, a spring (unstrained length = 0.30 m) hangs from the ceiling. a board whose length is 1.86 m is attached to the free end of the spring. the board hangs straight down, so that its 1.86-m length is perpendicular to the floor. the weight of the board (104 n) stretches the spring so that the lower end of the board just extends to, but does not touch, the floor. what is the spring constant of the spring?

What is created when solids, liquids, an gases mix with one another

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

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