Ablock of mass m1 = 290 g is at rest on a plane that makes an angle θ = 30° above the horizontal. the coefficient of kinetic friction between the block and the plane is μk = 0.10. the block is attached to a second block of mass m2 = 200 g that hangs freely by a string that passes over a frictionless and massless pulley. find its speed when the second block has fallen 30.0 cm.

Which of the following compounds would be primarily ionic? methane, ch4, ammonia nh3, calcium chloride, cacl2, or carbon dioxide, co2

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

Diverging mirrors and lenses always produce images